## SHELL OFFSHORE INC.

3601 C Street , Suite 1000 Anchorage, AK 99503



# DRILLING ICE MANAGEMENT PLAN
Chukchi Sea , Alaska

Submitted to:



### U. S. Department of the Interior Bureau of Safety and Environmental Enforcement

Alaska Outer Continental Shelf Region

Submitted by:

Shell Gulf of Mexico Inc.P r i n t e d cop i e s o f t h i s do c u m e n t a r e UN C ONT R O LL E D . D e s t r o y ( R E CYCL E ) a f t e r u s e .

Drilling Ice Management Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 2 July, 2014 

## DRILLING ICE MANAGEMENT PLAN

A pproval : A pp r ov e d f or t h e Alas k a Ass e t

E ff e c t i ve This document is effective per the latest approval date above.

Expires I n f

o r c e until re vis e d a n d /or sup erse d e d.

Custodian Alaska Marine Manager

Author Ice Management Lead (July, 2014 Revision)

Reviewers Principal Arctic Marine Facilities Advisor

VP Alaska BOM

VP Arctic HSSE VP Alaska Operations Alaska Maritime Assurance Manager Alaska Wells Operations Manager Arctic Execution Manager

Offshore Regulatory Team Lead Shell Exploration & Production Company Approved Date

VP Wells Arctic & Indus try Regulatory Aff airs Signature on file 7/9/2014P r i n t e d cop i e s o f t h i s do c u m e n t a r e UN C ONT R O LL E D . D e s t r o y ( R E CYCL E ) a f t e r u s e .

Drilling Ice Management Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 3 July, 2014 

### T op i c D ef

ine the method and system to ensure the safe departure of the drilling

unit from the well site due to incursion of hazardous sea ice.

P u r p o s e / Sc op e The pu r

pose of this Drilling Ice Management Plan is to p r o vide a

c onsist e nt, s a f

e m e thod f

or f ull c ompli a n c e with the Al a ska V e ntu r e

op e ra ti n g / p er mi t ting re qui r e m e nts with regard to the Critical Operation Curtailment Plan which encompasses the Drilling Ice Management Plan

.

A pp li e s t o This do c um e nt a ppli e s to a ll S h e ll e mpl o y ee s a nd c ont rac to r s c ondu c ti n g

op era tions on b e h a lf o f t he S h e ll Al a ska V e ntu r e

.

P r i m ar y R e s p on si b i l i t y Al a ska V e ntu r e Maritime & Logistics sup er vision sh a ll be re sponsible f or

a ss u r ing th a t this plan is p r o vid e d a nd th a t op e r a to r s ar e inst r u c t e d to u s e this p r o ce du r e p r ior to a ll marine drilling operations in Arctic waters where sea ice incursion is expected

.Drilling Ice Management Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 4 July , 2014 

## Table of Contents

I. INTRODUCTION

................................ ................................ ................................ ............. 5

A. Scope

................................ ................................ ................................ .................. 5
B. Drilling Ice Manageme nt Plan Objective

................................ ............................... 6
C. Drilling Ice Management Principles

................................ ................................ ...... 6

II. DEFINITIONS

................................ ................................ ................................ .................. 6

A. Roles and Responsibilities

................................ ................................ ................... 6

B. Definitions and Abbreviations

................................ ................................ ............... 7

III. VESSELS COVERED BY T HE DRILLING ICE MANA GEMENT PLAN

......................... 10

A. Drilling Units

................................ ................................ ................................ ....... 11

B. Ice Management Vessels

................................ ................................ ................... 12

1. Pri mary Ice Management Vessels

................................ .......................... 12

2. Secondary Ice Management Vessels / Anchor Handlers

........................ 13

IV. SHELL ICE AND WEATHE R ADVISORY CENTER

................................ ...................... 13

A. SIWAC ICE DATA INPUTS

................................ ................................ ................ 14

B. Data Transmission

................................ ................................ ............................. 14

V. ICE ALERT LEVELS AND PROCEDURES

................................ ................................ ... 16

A. Ice Alert Levels

................................ ................................ ................................ .. 16

B. Ice Alert Roles and Responsibilities

................................ ................................ ... 16

VI. ICE MANAGEMENT PHILO SOPHY

................................ ................................ .............. 19

A. Proper Equipment

................................ ................................ .............................. 20

B. Skilled P eople

................................ ................................ ................................ .... 20
C. Appropriate Information

................................ ................................ ...................... 20

D. Work Process

................................ ................................ ................................ .... 21

VII. WELL SUSPEN SION PROCEDURES

................................ ................................ .......... 21

A. Well Suspension Options

................................ ................................ ................... 21

VIII. MOORING SYSTEM RECOV ERY / DISCONNECTION

................................ ................ 23

A. Conditions Present to Initiate Mooring System Disconnection or Recovery

........ 23

B. Disconnection / Recov ery Options

................................ ................................ ..... 23
C. Mooring System Release / Recovery

................................ ................................ . 23

IX. MOVING ONTO OR RETUR NING TO THE DRILLSIT E

................................ ............... 23

X. TRAINING

................................ ................................ ................................ ..................... 24

XI. ATTACHMENTS

................................ ................................ ................................ ........... 25

Attachment 1

– Extract from Critical Operations Curtailment Plan

................................ . 25
Attachment 2

– Vessel Description

................................ ................................ ................ 26
Attachment 3

– Shell Ice and Weather Advisory Center

................................ ................ 52
Attachment 4

– Ice Alert Logs

................................ ................................ ........................ 53Drilling Ice Management Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 5 July , 2014 

### I. INTRODUCTION

A. Scope

A Critica l Operations Curtailment Plan ( COCP) is in place for the Shell Gulf of Mexico Inc. (Shell) Chukchi Sea Exploration Drilling Program. As part of the COCP, this Drilling Ice Management Plan ( DIMP ) has be en developed. The description of notification of curtailment (an excerpt from the COCP) is presented in Attachment 1

.

Drillin g operations in the Chukchi Sea will be conducted using two drilling units operating simultaneously. The drilling units are the “Noble Discoverer” and the “Polar Pioneer”

. Both drilling units will operate according to this Drilling Ice Management Plan

The DIMP addresses the following activities :

 Vessels

 Shell Ice and Weather Advisory Center (SIWAC ), located in Anchorage

 Ice Alerts and Procedures

 Ice Management Philosophy

 Well Suspension Contingencies

 Mooring System Recovery and Release

 Moving onto or returning to the Drill S ite

 Training

The DIMP :

 Defines Roles and Responsibilities

 Establishes Alert Levels

 Establishes Responses to Alert Levels

The DIMP facilitates appropriate decision

- making and responses to the threat of hazardous ice

and procedures set forth in the DIMP to prevent damage or harm to personnel, assets, or the

environment.

Nothing in this document takes away the authority and accountability of the Master(s) of the vessels for the safety of their personnel and vessels

, and for protection of the environment.

This plan is not a substitute for good judgment.

Guidance Note: This document is not intended to contain detailed procedures. Detailed procedures are contained within the vessel

- specific operating manuals and the Shell Ice Management Guidance and Procedures manual.Drilling Ice Management Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 6 July , 2014 

### B. Drilling Ice Management Plan Objective

 The objective s of th e DIMP are to detect and monitor sea ice conditions

, i dentify

hazardous ice and determine manageability as per the DIMP and Alert S ystem in

order to ensure risk to personnel

, drilling units, vessels or well s is reduced to ALARP

.

 The Ice Alert System is central to the function of the DIMP

. It is based on five progressive alert levels. Each level defines operational status, roles, responsibilities

and a ctions required.

C. Drilling Ice Management Principles

 Early detection of ice features

 Assessment of the ice regime

 Identification of Hazardous Ice

 Assessment of Ice Management Vessel ( IMV ) capabilities to manage ice

 Calculation and monitoring of Hazardous Ice arrival at drill site

, Hazard Time (HT)

 Continuous assessment of time required to secure the well

, Secure Time (ST)

 Continuous assessment of time required to move rig off location

, Move Time (MT)

 Alert Level assignment which triggers the appropriate responses

 Development of ice management strategy

 Monitoring effectiveness of strategy

 Predefined roles and responsibilities

II. DEFINITIONS

A. Roles and Responsibilit ies

Responsibilities have been defined for key on

- site personnel in S ection V. In addition to the defined personnel the following onshore positions have a role to play in the DIMP

.

Wells Operations Manager

Shell’s Wells Operations Manager is the senior Shell shore

- based manager responsible for all Shell well operations offshore Alaska.

Wells Operations Team Leads

The Wells Operations Team Leads are responsible for Shell well operations at a specific

well site

. There is a Wells Operations Team Lead ashore for each drilling location who will update the OEMT on Ice Alert Status or changes to the Ice Alert Level.Drilling Ice Management Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 7 July , 2014 

### Ice Management Lead Anchorage

The Ice Management L ead heads the ice management team and works with the offshore

Ice Advisors (IAs) stationed on vessels to develop daily strategies and designate areas or

ice features which are of concer n

. The Ice Management Lead liaises with the Shell Wells Operations Team Lead

, SIWAC and the OEMT

. Shell Ice and Weather Advisory Center (SIWAC)

B ased in Anchorage Alaska SIWAC develops ice and weather forecasts and analy s is for Shell Management and the m arine fleet

. A full description is available in section IV.

S IMOPS Coordinators

The SIMOPS Coordinators working under the direction of the OEMT, will assist in coordinating the cascading activities of the entire fleet from the consequences of having to rel ocate a drilling unit(s) per the DIMP

. 

### Operations Execution Management Team (OEMT)

The OEMT, comprised of leadership from each business function and representation from support functions, implements the control and recovery of the 7

- day operational Integ r ated Activity Plan (IAP) in accordance with the Integrated Operations Management Procedures (IOMP). The scope of the IOMP is to support field operations by maintaining

up

- to

- date information, providing resources as needed, coordinating activities, and to

b ring decision

- makers together to coordinate exploration and support activities.

B. Definitions and Abbreviations

AHTS a nchor h andling t ug s upply



### Aiviq MV Aiviq

– Secondary IMV and anchor handling vessel



### APD Applications for Permit to Drill



### AT Alert Time

- The result of (HT)

– (T

- Time) which translates to Alert Level



### API American Petroleum Institute



### bbl barrel(s)



### BHA Bottom Hole Assembl y



### BOP Blowout preventer



### BSEE Bureau of Safety and Environmental Enforcement



### CFR Code of Federal Regulations



### CIS Canadian Ice Services

cm c entimeter ( s )

COCP Critical Operations Curtailment Plan



### D ia

. diameter



### DNV Det Norske VeritasDrilling Ice Management Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 8 July , 2014 

### DP Dynamic Positioning



### ea each



### Fennica M/V Fennica

– Primary IMV



### ft f

oot/feet



### FTP file transfer protocol



### FY First

- year ice. Sea ice of not more than one winter’s growth, developing from

young ice; 12 inches (in.) (30 centimeters [cm]) or greater. It may be subdivided

into thin FY 30

- 70 cm

– sometimes referred to as white ice, medium FY 70

- 120

cm and thick FY >12 0 cm up to 2 m

. 

### gals. gallons



### GFS Global Forecast System



### GIS Geographic Information System



### Hazardous Ice Ice, which due to its size, stage of development, concentration, set and drift is

considered to be a threat to the safety of personnel, the d rilling u nit and well operations. Close proximity of an ice feature regardless of its set and drift may

determine it to be hazardous ice.

Guidance Note: Sea state as well as visibility may influence what is categorized as

hazardous ice.



### HOS Hang

- off S ub



### hp horsepower



### HT Hazard Time. The estimated time it will take for hazardous ice to reach the drill

site.



### Hz hertz



### IA Ice Advisor



### IAP Integrated Activity Plan



### IOC Integrated Operations Center



### IOMP Integrated Operations Management Procedures



### IMO International Maritime Organization



### DIMP Drilling Ice Management Plan



### IMV Ice management vessel. Any ice class vessel tasked with ice management duties

in support of the drilling unit

. This includes the primary ice management vessel (IMV) and the ice cla ss Anchor Handling Tug Supply (AHTS)



### in. Inch(es)



### kg kilogram(s)



### kW kilowatt(s)



### lb pound(s)Drilling Ice Management Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 9 July , 2014 

### LMRP Lower Marine Riser Package



### m m eter(s)



### m 2 square meter(s)



### m 3 cubic meter(s)



### MHz megahertz



### MODU Mobile Offshore Drilling Unit

. MODU’s are facilities designed or modified to

engage in drilling and exploration activities. The term MODU includes drilling vessels, semisubmersibles, submersibles, jack

- ups, and similar facilities that can be moved without substantial effort. These facilities may or may not h ave self

propulsion equipment on board and may require dynamic positioning equipment or mooring systems to maintain their position.



### mt metric tons



### MT Move

- off Time. The time required to clear decks on the anchor handler recover or

release moorings conven tionally and move off the drill site in an orderly fashion.



### M/V Motor Vessel



### MY Multi

- year ice. Old Ice ( OI ) up to 3 m or more thick which has survived at least

two summers’ melt. Hummocks are smoother than on SY and the ice is almost

salt

- free. Where bare, this ice is usually blue in color. The melt pattern consists of large interconnecting, irregular puddles on the surface in summer and a well

developed drainage system.



### NOAA National Oceanic and Atmospheric Administration



### Noble Discoverer Turret

- mo o red drilling vessel (MODU)



### Nordica M/V Nordica

– Primary IMV



### OCS Outer Continental Shelf



### OEMT Operations Execution Management Team

OI Old ice. Sea ice which has survived at least one summer’s melt. Topographic

features generally are smoother than FY. It may be subdivided into Second

- year ( SY ) ice and Multi

- Year (MY) ice.



### OIM Offshore Installation Manager



### OSR Oil Spill Response



### OSV Offshore Supply Vessel



### PIC p erson in c harge



### Polar Pioneer Column stabilized semi

- submersible drilling unit (MODU).



### psi pounds per square inch



### RAR rig anchor release



### RP Recommended PracticeDrilling Ice Management Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 10 July , 2014 

### RPM revolutions per minute



### SAR Synthetic Aperture Radar



### Shell Shell Gulf of Mexico Inc.



### SIMOPS Simultaneous Operations



### SIWAC Shell Ice and Weather Advisory Center



### Support Vessels Includes all vessels defined in this plan (IMV/OSR/AHTS/OSV).



### SWL Safe Working Load



### SY Second

- year ice. OI which has survived only one summer’s melt. Thicker than FY

with thickness up to 2.5 m , it stands higher out of the water. Ridged features a s a result of melting during the preceding summer attain a smooth rounded shape. In

contrast to MY ice , summer melting produces a regular pattern of numerous small puddles. Bare patches and puddles are usually greenish

- blue.



### ST Secure Time. The time requi red to secure the well, disconnect the LMRP from the

BOP, recover and secure the riser.



### TD Total depth



### T

- Time Total Time. The sum of ST + MT



### Tor Viking II M/V Tor Viking II

– Secondary IMV and anchor handling vessel



### UHF ultra high frequency



### U.S. United States



### USCG United States Coast Guard



### VMT Vessel Management Team. This team is headed by the drilling contractor ’ s

Master / OIM and includes the drilling contractor ’ s Rig Manager / OIM, and the Chief Engineer/Barge Captain and Shell ’s Drilling Sup ervisor and IA



### Wx weather



### III. VESSELS COVERED BY THE DRILLING ICE MANAGEMENT PLAN

 Dril l ing Unit

– “

Noble Discoverer ”

 Drilling Unit

– “Polar Pioneer”

 Primary Ice Management Vessel (IMV)

– “ M/V Fennica ”

 Primary Ice Management Vessel (IMV )

– “ M/V Nordica ”

 Secondary Ice Management Vessel ( IMV ) and Anchor Handler

– “ M/V Tor Viking II ”

 Secondary Ice Management Vessel ( IMV ) and Anchor Handler

– “ M/V Aiviq ”

Guidance Note: The term “drilling unit” is used throughout this document and refers to both the

“Noble Discoverer” a self propelled drilling vessel and the “Polar Pioneer” a non self

- propelled

semi

- submersible. Both units are defined as MODU’s. The final authority with regard to safety onboard a drilling vessel is the Master

. The final authority for safety onboard a non self

propelled semi

- submersible is the OIMDrilling Ice Management Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 11 July , 2014 

### A. Drilling Units

All planned exploration drilling in the identified lease blocks will be conducted with the Noble

Discoverer and the Polar Pioneer

.

The Noble Discovere r is a turret moored self

- propelled d rillship. Station keeping is accomplished using a turret

- moored, 8

- point anchor system. The underwater fairleads prevent ice fouling of the anchor lines. Turret mooring allows orientation of the vessel’s bow into the

pre vailing metocean conditions to present minimum hull exposure to drifting ice. The vessel is rotated around the turret by hydraulic jacks. Rotation can be augmented by the use of the fitted

bow and stern thrusters. Ice

- strengthened sponso n s have been retrof itted to the ship’s hull.

The Noble Discoverer is classed by Det Norske Veritas (DNV) as a Mobile Offshore Drilling Unit (MODU) for worldwide service. It is a “1A1 Ship

- Shaped Drilling Unit l” and is capable of performing drilling operations offshore Alask a. The Noble Discoverer has been issued with a DNV Appendix to Class stating:

“ The structural strength and material quality of the ‘Ice Belt’ formed by the sponsons below the 8,950 mm A/B level, have been reviewed against the requirements for the DNV ICE

- 0 5 Additional Class Notation and found to meet those requirements (as contained in DNV Rules for Classification of Ships, Pt 5 Ch 1, July 2006) for a design temperature of

- 15 degrees C .”

The Polar Pioneer is classed by Det Norske Veritas (DNV) as a Mobile Offshore Drilling Unit (MODU) for worldwide service. It is a non

- self

- propelled, “SPM thruster assisted” (TA) semisubmersible offshore drilling unit of twin

- hull configuration

. The rig is a “ + A1 Column

Stabilized Unit ” and is capable of performing drilli ng operations offshore Alaska

.

Positioning is accomplished with a combination of an eight

- point all chain catenary mooring system and dynamic positioning system.

Polar Pioneer was built in 1985, with unlimited operation area, in accordance with the

“Norw egian Maritime Directorate” and to “Det Norske Veritas regulations

, ” current at that time. While operating in Norwegian waters, the installation, with its inventory, equipment, crew and machinery was required to comply with current rules and regulations fo r operation on the Continental Shelf of Norway.

The drilling units will undergo inspections by BSEE and Det Norske Veritas (DNV) for certification before entering the theater. The DNV certificates will be forwarded to BOEM.

The drilling units will comply with all of the regulations of DNV, the International Maritime Organization (IMO), and the U.S. Coast Guard (USCG). All exploration drilling operations will be conducted under the provisions of 30 CFR Part 250 Subpart D, and other applicable regulations a nd notices including those regarding the avoidance of potential drilling hazards, safety and pollution control.

Procedures for monitoring and reacting to ice in the prospect areas are provided in the Critical Operations and Curtailment Plan (COCP) and th e Drilling Ice Management Plan ( D IMP)Drilling Ice Management Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 12 July , 2014 

### Drillship Principal Dimensions

Dimensions “ Noble Discoverer ” Length Overall 514 ft 156.7 m

Transit Draft 27 ft 8.2 m Drilling Draft 25.12 ft 7.67 m

B readth 85 ft 26 m



### Drill Rig Principal Dimensions

Dimensions “ Polar Pioneer ” Length Overall 400 ft 122 m
B readth over all 292 ft 89 m Transit Draft 30 ft 9.15 m Drilling Draft 75.44 ft 23 m
Survival Draft 62.32 ft 19 m



### B. Ice Management Vessels

Ice management support to the drilling units will be provided by the Fennica

, Nordica

, Tor Viking II and Aiviq

. The drill units will be supported by these IMVs from the beginning of the campaign until the vessel departs the area. A description of these vessels is provided in

Attachment 2.

Ice Management Vessel Principal Dimensions

Dimensions Fennica & Nordica

DNV Icebreaker

Polar

- 10 Tor Viking II

DNV Icebreaker

Ice

- 10 Aiviq
ABS A

- 3

Icebreaker Length Overall 380 ft (116 m) 275 ft (83.7 m) 361 f t (109.9 m)

Draft 27 ft (8.4 m) 20 ft (6.0 m) Ice Max 25 ft (7.62 m )

Breadth 85 ft (26 m) 59 ft (18.0 m) 80 ft (24.38 m)

Bollard Pull 230 tonnes 200 tonnes 200 tonnes



### 1. Primary Ice Management Vessel s

The Fennica and the Nordica are designated as the primary IMV s

. Both vessels are classed by

DNV as +1A1 Tug Supply Vessel Icebreaker Polar

- 10 . Designed for ice management, maintenance and service of offshore oil wells, the 380

- ft (116

- m) Fennica and Nordica are multi

- purpose vessel s specialized in marine construction and icebreaking. The Fennica and

Nordica are equipped with diesel

- electric propulsion systems and their innovative combination of capabilities, based on extensive design and engineering work, facilitates use of these systems

in arctic conditions.Drilling Ice Management Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 13 July , 2014 

### 2. Secondary Ice Manageme nt Vessel s / Anchor Handler s

The Aiviq is designated as a secondary IMV and anchor handler. The Aiviq is classed by ABS as A1, A3 (Icebreaker). Designed for ice management, anchor handling, and maintenance and service of offshore oil wells, the 361

- ft (109.9

- m) Aiviq is a multi

- purpose vessel specialized in anchor handling and icebreaking.

The Tor Viking II is designated as a secondary IMV and anchor handler. The Tor Viking II is classed by DNV as +1A1 Supply Tug Icebreaker Ice

- 10. Designed for ice ma nagement, anchor handling, and maintenance and service of offshore oil wells, the 275

- ft (83.7

- m) Tor Viking II is a multipurpose vessel specialized in anchor handling and icebreaking.

Guidance Note: Ice Management Vessels supporting the drilling units ma y be deployed to assist

other vessels or assigned to assist other Shell drilling units as operations and ice conditions dictate. Diverting ice management resources away from the drilling units may require a

curtailment of activities

. The decision to curtail activities as a result of diverting ice management resources away from the drilling vessel shall be made jointly by the Shell Drilling Supervisor and the Drilling Vessel Master/OIM. The onshore Shell Wells Operations Team Leader (in

consultation wi th the drilling contractor’s Rig Manager) will endorse the plan or set priorities if agreement cannot be reached at the field level.

IV. SHELL ICE AND WEATHER ADVISORY CENTER

SIWAC is an integrated forecasting service staffed 24/7 by industry

- leading special ists under Shell contract in Anchorage

, Alaska. SIWAC’s primary function is to provide present and forecast ice and weather conditions directly to field operations and planning managers during the operational season. SIWAC provides information to decision makers and field principals to help them minimize risks when operating in the presence of ice. To provide quality and accurate information, SIWAC depends on skilled forecasters, subscription and public satellite imagery, numerical models, field observatio ns, Geographic Information System ( GIS ) software tools, and

a robust communication network.Drilling Ice Management Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 14 July , 2014 

### A. SIWAC ICE DATA INPUTS

Ice forecasts are developed and issued daily. The Lead Ice Analyst compiles available data from subscription, specialized, and public services in ArcMAP ( GIS Software) such as:

 MDA RadarSat 2 imagery

 MODIS satellite

 Canadian Ice Services

 National Ice Center

 Contract weather services

 Field observations

 IceNav images

B. Data Transmission

Effective communication of SIWAC ice and weather guidance and reciprocal feedback and field observations requires a robust and capable data network. The d rill ing u nits and IMVs are equipped with high

- speed data and voice satellite service that has been proven to perform well in

the U

. S

. Chukchi and Beaufort Seas.

Data, including satellite imagery and observations, are relayed through a file transfer protocol ( FTP ) site between SIWAC and the field vessels using automated processes. This keeps both the field and forecasters continuously refreshed with the latest information. In addition, SIWAC maintains a secure website that allows direct, on demand access to all forecast reports and data products. Additional information about SIWAC is provided in Appendix 3

.Drilling Ice Management Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 15 July , 2014 

### Ice Information Flow Chart

NOTE: This g raphic depicts the constant two

- way communication that would occur between the various components of the system.

Guidance Note:

Additional information regarding ice may be requested by the Master of the drilling units . Any

m eans appropriate to the circumstances, shall be used to provide this information. Where this information is to be obtained by aerial reconnaissance, the Ice Management Lead in Anchorage will liaise with Shell Logistics to provide the appropriate resources.Drilling Ice Management Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 16 July , 2014 

### V. ICE ALERT LEVELS AND PROCEDURES

These procedures define five Alert L evels that are linked to the time that hazardous ice is

forecast to be at the drilling location, and the time required to secure the well and move the drilling unit off location if i t becomes necessary . Roles, responsibilities

, and actions required are specified according to the Alert L evel.

A. Ice Alert Level s

ALERT

LEVEL TIME CALCULATION STATUS

Green Alert Time is greater than 24 hours Normal operations

Blue Alert Time is greater than 12 hours Less

than 24 hours Initiate risk assessment Validate secure

times (ST) & move time (MT)

Yellow Alert Time is greater than 6 hours Less

than 12 hours Limited well operations in line with COCP, Commence securing well

Red Alert Time is less than 6 hours Well s ecuring o perations c ompleted. Commence anchor recovery operations

.

Black Drillsite evacuated Move drilling unit to a safe location



### HT = Hazard Time

MT = Move Time

ST = Secure Time

T

- Time (Total Time) = ST + MT

AT = Alert Time

AT = HT

– T

- Time

Guidance Note:

If the Alert Time (AT) value becomes negative at any time well securement and drillsite evacuation contingency plans will be initiated. Ice Alert Roles and Responsibilities The following table s summarize roles, responsibilities and actions required for key on

- site personnel for each Ice Alert Level.Drilling Ice Management Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 17 July , 2014 

# ROLES AND RESPONSIBILITIES FOR ALL

ALERT LEVELS

Drilling Unit
Master / OIM Shell Ice Advisor

Drilling Unit Shell IMV

Ice Advisor IMV Master Rig Manager

– Noble Drilling

OIM

– Transocean Drilling Unit Shell Drilling

Supervisor Drilling Unit

The Master / OIM is the person in charge (PIC) of the drilling unit

. He is the final authority in regards to safety of the vessel,

crew and compliment. All changes of Alert

Level are issued by the Master /
OIM

. The responsibility

to evacuate the

drillsite in response to a
hazard rests with

the Master / OIM

.

Evaluates
information from SIWAC, IAs and

Vessel Management Team (VMT).

Establishes MT in conjunction
with the AHTS

Masters.

Establishes Ice

Alert Level on advice from IA

and is responsible for

ice management operations.

Ensures Alert
Level status is

broadcast to
fleet and internally throughout drilling unit at
intervals dependent on

Alert Level or at change of Alert

Level

. Collates and

evaluates
information from the SIWAC, IMV

IAs and VMT.

Advises Master /
OIM o n

e stablishing Ice

Alert Level.

Directs ice management operations as required.

Correlates
Secure Time (ST) and Move Time ( MT) with
information from rig operations.

Establishes

Hazard Time (HT) in conjunction with

IMVs and

advises Master /
OIM and VMT.

Works in conjunction with

IAs on IMVs to develop and
establish
effective ice management strategies and

advises Master /
OIM

.

Ensures current
ice drift is

broadcast to fleet, and liaises
with SIWAC. The IA is Shell’s

IM representative

onboard the

IMVs and is the primary contact
for all

communications
with the Master
/ OIM . He

advises the IMV
Master in executing the

ice management strategies.

Works in conjunction with
Master of IMVs

to determine the

local ice

conditions and
hazardous ice.

Works in conjunction with

d rilling unit IA

and IMV Master to develop and implement
effective ice management strategies.

Provides
fee dback on
effectiveness of strategy and reports any
anomalies pertaining to

ice. The Master is

the PIC of the

IMV. He is the final authority in regards to safety of the vessel, crew

and complement.

Evaluates
advice from
SIWAC and IAs ( d rilling

u nit and

IMV s).

Works in conjunction

with IA on drilling unit
and IA of IMV to develop and

execute
effective ice management strategies

within the capability of

the vessel.

Provide s feedback on
effectiveness of the strategy

to the IA on

the IMV.

Reports to

IMV IA any condition
which inhibits

vessel performance. The Rig Manager

/ OIM is the drilling contractor

on

- site supervisor responsible for all drilling

- related operations aboard the drilling unit

.

Establishes ( ST )

and informs VMT
of ( ST ) and well

conditions.

Validates drilling
team is aware of

their duties under present Ice Alert

status.

Validates well

secure contingency plans. The Drilling Supervisor

is the senior on

- site Shell supervisor with responsibility for overseeing drilling and well operations and fo r initiating spill response
as the Onsite Incident Commander for spills originating from the well

site.

Validates well ST in conjunction with the Rig Manager / OIM . Informs

Master / OIM regarding ongoing and upcoming critical operations and curtailment plans.

Communicates status of

well and Ice Alert level to
Shell shore management and
SIMOPS coordinator

Under the authority of
the Shell Wells Operations Team Lead

, the Shell Drilling
Su pervisor may raise the Ice alert level at any
time

. He may order the suspension of drilling operations, and securing
of the well.Drilling Ice Management Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 18 July , 2014 Alert Conditi

on VMT

Meeting

F requency Drill ing Unit

Master / OIM Shell Ice
Advisor Drilling Unit Shell IMV Ice

Advisor IMV Master Rig Manager

– Noble Drilling

OIM

– Transocean Drilling Unit Shell Drilling

Supervisor Drilling Unit

Green Alert

Time is greater
than 24

h ou rs. Every 24

h ou rs

, or

more frequently

as needed

. Discharges

duties as per

accountabiliti

es Discharges

duties as

per accountabili
ties

. Discharges

duties as per

accountabiliti

es

. Discharges

duties as per

accountabiliti

es

. Discharges

duties as per

accountabilities

. Discharges

duties as per

accountabilities

.

Blue Alert

Time is greater
than 12

h ou rs and

l ess than 24

h ou rs

. Every 12

h ou rs

, or

more frequently

as needed

. Ensure s

readiness to

execute contingency plans.

Ensures primary IMV

is available

to execute
Ice Management strategies for the given ice regime.

Ensures
AHTS / IMV
readiness for

ice management
and anchor handling operations. Establish es

Ice Manageme

nt Strategies

in conjunction

with IMVs
and IA

on board

IMVs.

Directs ice

manageme
nt operations Proposes

appropriate
Ice Management Strategies

based on real

time

assessment
of the Ice Regime and

advises IMV
Master and

d rilling unit

IA

.

Validate s readiness of

IMV to

execute ice management strategy

. Executes Ice

Management Strategies in conjunction

with IA on IMVs.

Establish es and states

readiness of

IMV to
execute ice management strategy

. Establishes ST

and assesses upcoming well operations for changes to ST with regard to
COCP

.

Informs VMT of
ST and well

conditions.

Validates securing contingency plans. Validates ST in

conjunction with
the Rig Manager
/ OIM

.

Informs Master /
OIM regarding ongoing and upcoming critical operations and
COCP

.

Reports Alert changes to Shell

shore

- based management and SIMOPS

coordinator

Yellow Alert

Time is greater
than 6

h ou rs

, and

l ess than 12

hours

. Every 6

h ou rs

, or

more frequently

as needed

. Establishes

and

Validates

MT.

Establishes departure strategy.

Ensures
Alert status

is broadcas t
to fleet and internally at

1

- h ou r intervals or at change of

A lert L evel

. Establishes

HT

, and

advises

Master /
OIM and

VMT.

W orks in conjunction

with IA on IMVs to

initiate ice

manageme
nt strategies.

Directs ice

manageme
nt operations

Ensures

current ice
drift is

broadcast
to fleet. Implements

ice management strategies as directed by

d rilling unit IA in conjunction

with IMV

Master

.

Provides
feedback on
effectiveness of strategy

. Executes ice

management strategies as directed by
d rilling unit

IA

.

Provides
feedback on
effectiveness
of the strategy. Commence s

securing well in

accordance with agreed plan

. I nforms VMT of

pro gress. Monitors Well

Securing Operations and

effectiveness of ice management operations.

Communicates

overall drilling

unit status to Shell shore management
and SIMOPS

coordinatorDrilling Ice Management Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 19 July , 2014 Red Alert

Time is
less

than 6

hou rs

. Every

hour

. Initiate s

departure plans following
confirmation
from Rig Manager /
OIM th at the
Lower

Marine Riser Package ( LMRP ) has

been

retrieved and
secured and guide wires

are released.

Ensure s Alert status
is broadcast
to fleet and internally

. Directs
AHTS

activities. Assess es

effectivenes
s of Ice Manageme nt Strategy

in line with ongoing operations

.

Directs ice

manageme
nt operations

and a ssist s Master /
OIM as needed.

Ensures

current ice
drift is

broadcast
to fleet during

anchor

recovery operations. Continues to

implement
ice management strategies in support of drilling unit

and anchor

recovery operations. Execute s ice

management strategies as directed by

d rilling unit

IA.

Conducts

activities

associated with releasing
the drilling

unit from

moor ings as directed by

Master or
OIM

. Confirms well is

secured and
that LMRP is disconnected,

retrieved and
secured.

Commence s securing drill
floor for departure from

site. Monitors rig

securing operations and departure plan.

Communicates
status to She ll

shore management
and SIMOPS

coordinator

Organizes

additional support as needed for site departure operations (for example logistics)

.

Black Drill

site

evacua ted As

needed

. Directs

operations leading to
safe departure
from drill site to pre

agreed safe

area.

Complies

with all regulatory reporting requirements (internal and external)

.

Works with

VMT and IA
and IMVs to

establish
further
course of

action. Continue s

to monitor
ice

conditions.

Works in conjunction

with IMV
IAs to plan

a route to
safe area and passes routing to

Master.

Provides

Master /
OIM and

VMT with
information

to aid
further

decision making. Advises IMV

Master on operations leading to
safe tr ansit
from drill site to pre

- agreed
safe area.

Provides
infor mation to
d rill ing unit

Master /OIM

to aid further

decision making. Works under

direction of

the d rill ing

unit Master

and IMV IA during transit. Confirms drill

floor and

associated

areas are secured and ready to depart

drill site.

Provides
information to

Master / OIM

and VMT to aid
further decision making

. Informs Shell

shore management
and SIMOPS

coordinator of

evacuation.

Complies with all regulatory reporting requirements (internal and external)

.

Provides
information to

Mast er / OIM

and VMT to aid
further decision making

.



### VI. ICE MANAGEMENT PHILOSOPHY

An effective Drilling Ice Management Plan is designed to enable execution of the exploration program, with the appropriate barriers in place to manage and mitigate against risks associated

with ice . A dditionally

, it also identifies the worst case scenario that is caused by the failure of barriers and addresses the procedures to deal with consequences of escalation.

The worst case scenario for the purpose of the DIMP is the forced and uncontrolled departure of the drilling unit from the drillsite by incursion of hazardous ice. This section addresses the

activities associated with ice m anagement as a barrier to this worst case scenario

. The strategy to prevent th is event is to have the following elements as effective barriers:Drilling Ice Management Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 20 July , 2014 

###  proper equipment,

 skilled people

,

 appropriate information , and

 work processes

The key elements identified above are discussed herein.

A. Proper Equipment

 The Primary IMVs will have the appropriate ice class with ice breaker capabilities and have been contracted to support the exploration campaign.

 IceNav: The drilling units and IMVs will be outfitted with IceNav Equipment (Enhanced radar imaging of ice and geo

- synchronized satellite imagery )

.

 Tor Viking II and Aiviq are high specification anchor handling vessel s and have been designated as the secondary IMVs and anchor handling vessel s

.

 Ice reconnaissance aircraft capability

B. Skilled People

 The drilling units and all IMVs will carry specialist IA s , in addition to the regular crew complement.

 The drilling units will have two IA’s onboard for 24/7 coverage

.

 T he Primary IMVs will have two IA ’ s onboard providing 24/7 coverage.

 The Secondary IMVs will have one IA onboard.

 T he IAs suppor ting the exploration campaign will have documented experience of having performed ice management activities associated with supporting offshore exploration.

 SIWAC will be staffed with world

- class industry

- acknowledged experts in weather,

satellite

, and Ice Syn optic analysis.

 Qualified and experienced ice observers for ice reconnaissance flight s

.

 IMVs will have crews who are experience d operating in ice

.

C. Appropriate Information

A multi

- layered, system at ic approach is taken to provide relevant info rmation from SI WAC with

a feed back loop from the vessels using :

 Wide Area Satellite Imagery

 High Resolution Satellite Imagery

 Meteorological Buoys

 Field Observation from IMV ice reconnaissance

 Numerical Models

 Local Radar

 Vessels are outfitted with Fit for Purpose Data and Communications linkDrilling Ice Management Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 21 July , 2014 

### D. Work Process

A system at ic approach for risk mitigation is adopted by developing effective work processes.

 Development of effective ice management strategies based on available information (Global and Local)

 Deployment of assets to deliver strategy :

 Threat Sectors identified

 Assess manageability of ice feature (preferably by trial breaking as this is the only way to determine manageability)

 Appropriate management of ice feature (breaking/deflecting)

 Primary Icebreaker deployed at an effective perimeter to reduce floes to manageable size

in advance of Hazardous Ice triggering an increase in Alert Level

 Scheduled VMT meetings (Frequency Dictated by Alert levels)

 Planning/Coordination meetings with specific focus on Ice Alert Levels

VII. WELL SUSPENSION PROCEDURES

E ffective ness of the DIMP is dependent upon being able to accurately establish HT

, ST and MT

. ST is time taken to secure the well, disconnect and retrieve the LMRP.

As part of securing the well, well suspension procedures have been esta blished. These procedures will be contained within the drilling unit o perat ing p rocedures

. Return to the drill site following exit due to the threat of Hazardous Ice is covered in Section IX.

A. Well Suspension Options

Securing and s uspending the well can be accomplished by several means. The base case is to suspend the well with mechanical and/or cement plugs

. This method is to be used for Ice Alert

Level calculations

. Should ice or well conditions develop where ST must be reduced

, the following conti ngencies and option s or com bination thereof can be chosen. The option or contingency will be depende nt upon well conditions , environmental conditions and ( or ) equipment limitations. S hell will employ the most effective suspension procedure under the specific circumstances at the time. Relevant information associated with well suspension w ill be documented in the daily d rilling

r eports. The BSEE field representative will be apprised

, and r elevant records will be submitted

to BSEE

. Potential well suspension options are listed in the following table

.Drilling Ice Management Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 22 July , 2014

Mechanical Plugging Drill pipe Hang

- off Pull Out of Hole Shearing Drill Pipe Dropping String

Time Required /

Preference Requires most time. Is the

base case procedure for

securement and for Ice

Alert Level calculation

. Less time than plugging. Potentially less time

, depending upon position in hole. Least amount of time. Stuck pipe contingency. Comparable to shearing

drill pipe . Contingency to cope with mechanical hoisting failure.

Provides

wellbore Isolation Yes Yes (blind/shears closed) Yes (blind/shears closed) Yes (blind/shears closed) Yes (blind/shears closed)

Hang

- off Sub (HOS) Required No Yes (Emergency Drill Pipe Hang

- off Tool) No No No

Packers / Bridge Plug Required Yes No No No No

Potential to Leave String in

Hole Yes

, if suspended below

packer. Yes No Yes, but access to pump through sheared string is questionable. String in hole but requires

fishing trip and overshot to

circulate.

Remarks Mechanical plugs are

preferred method in cased

hole. In this case

, no down hole plugging

has been assumed. This method is acceptable in

situations where casing has been run and cemented, but not drilled out yet. Pipe can be pulled and blind/shears

closed without further containment. Contingency for stuck pipe

situation. Contingency to cope with

mechanical hoisting f ailure.

Advantages Provides complete

wellbore isolation. Equipment readily

available. Provides wellbore
isolation via blind/

shear rams. Equipment readily
available. Can be done in a timely

manner. Leaves kill string in place for potential well

control requirements. Requires less time in situations where

casing has been run but not drilled out, or if already out of the hole as noted above, for logging or changing

the B ottom H ole A ssembly

. Quickest way to

secure the well and prepare for

move

- off. Next to shearing, quickest

way to prepare rig for

move

- off. Also leaves the top of the string in the hole undamaged and ready for recovery or circulating via overshot and packoff.

Disadvantages Takes longer. Packers

require additional tripping. Cementing requires mixing/ pumping time and introduces potential for

contamination. No down hole

wellbore isolation. Not a preferred method with open hole conditions because no pipe is left in the hole for potential well

control met hods. No down hole

wellbore isolation. Pot ential to leave a deformed pipe profile complicating fishing and circulating operations

. No down hole isolation is

accomplish ed. Requires fishing trip to

reestablish down hole

circulation.Drilling Ice Management Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 23 July , 2014 

### VIII. MOORING SYSTEM RECOVERY / DISCONNECTION

A. Conditions Present to Initiate Mooring System D isconnection or Recovery

This section addresses mooring disconnection / recovery operations if ice conditions have triggered an Ice Alert L evel of yellow and escalated to a red

. The following discussion assumes

the well has been secured and a ll recoverable well related equipment has been retrieved and

secured.

B. D isconnection / Recovery Options

Mooring System disconnection / recovery can be accomplished by several means. The base case is to recover moorings in the conventional manner . This method and the resultant MT is to be

used for the determination of the Ice Alert Level

. In the event condi tions develop where the

d rilling u nit must reduce MT

, t he selection of a specific c ontingency option and the execution o f the procedures rest s with the d rill ing u nit Master / OIM who informs the VMT

. Potential options and contingencies are listed in the t able below.

Guidance Note: Co nventional recovery for the Noble Discoverer refers to the disconnection of

the drilling unit mooring lines from the pre

- laid anchor system by an anchor handler. For the Polar Pioneer conventional recovery refers to recovery and racking of the complete anchor

system

C. Mooring System Release / Recovery

Contingency Mooring Release Options

Conventional Mooring Recovery Rig Anchor Release (RAR) Running off Wires

Time Required
/ Preference Requires most time. I s

the b ase case procedure for recovery Less time than conventional recovery Contingency plan if RARs fail to

activate.

Advantages System is intact.

Ready for redeployment

. Reduced MT Allows disconnection of mooring system in event of RAR failure.

Disadvantages None Increased redeployment time. Requires back up

eq uipment. Relies on actuation by acoustic

release. Complicates redeployment. High potential for seabed fouling.

Potential to compromise the mooring system.



### Guidance Note: The drilling unit s will have a RAR release command unit onboard

. A second

RAR release command unit will be on board the IMV / anchor handler

.

IX. MOVING ONTO OR RETURNING TO THE DRILLSITE

The authority to move on to or return to the drillsite will be issued by the Shell Wells Operations

Team Lead with the concurrence of the OEMT S hell Drilling Supervisor and Rig Manager /

OIM . Relevant regulatory authorities will be notified in accordance with the requirements.

A thoro ugh reconnaissance of ice regimes in the vicinity will be conducted and hazardous features plotted prior to commencing mooring operations.Drilling Ice Management Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 24 July , 2014 

### An Ice Alert Level of g reen
, together with a favorable ice condition forecast is required before mooring commences.

Recognizing HT will be the only argument available for the Alert Level calculation before mooring

, a minimum HT of 60 hours and a minimum distance of 30 miles to Hazardous Ice is required to give a reasonable period of time to set moorings and stay within Green A lert at completion of mooring.

Upon authorization b y the Shell Wells Operations Team Lead , t h e final decision to move on to or return to the drillsite is dependent upon the drilling unit Master or OIM who is advised by the

VMT

. The Master / OIM and VMT will assess the various operational, weather and ice parameters with input from the drilling unit IA supported by the IMV Masters and the IA s to determine the practicality of the decision . A decision to commence mooring operations assumes

a realistic expectation that the drilling unit will be able to stay on location and commence drilling operations for a productive length of time

. The OEMT will be informed of all decisions as they

are made.

X. TRAINING

All personnel will be made aware of their roles and responsibilities within this DIMP thro ugh a training sessi on on each vessel. This training will also include a Table Top Exercise, which will be executed prior to beginning operations

, p roviding exposure to and test communications and procedures of the COCP

, and the DIMP

. Participants at the table top exercise w ill include:

 Shell and Wells leadership

 Rig Crews (both Drilling and Marine Contractor staff)

 Oil Spill Response (OSR) representative

 SIWAC repr e sentatives

 BSEE Operations representatives

 IMV Masters or Senior officers

 IAs

 Alaska Logistics ( Marine and Aviation ) Representatives

 SIMOPS Coordinators

Observations from the Table Top Exerci se will be documented

.Drilling Ice Management Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 25 July , 2014 

### XI. ATTACH MENTS

Attachment 1

– Extract from Critical Operations Curtailment Plan

Per Section 8 of the COCP:

Notification of the decision for curtailments to Shell, USCG and BSEE agency representatives will be made as soon as practical, but in a manner that does not interfere with the safety of the crew, environment, or vessel. All operations curtailment decisio ns will be documented on the Shell Daily Operations Report and conveyed to the on

- site BSEE representative as they develop. Operations curtailment decisions will also be formally conveyed to BSEE on a weekly basis via the Well Activity Report and at the e nd of the well operations as part of the End of Operations Report. The following chart illustrates the lines of communication in the field and from the field

to the shore base.

Guidance Note :

Well Suspension procedures are described in step by step detai l in a document called Secure Times and Procedures contained within Shell Applications for Permit to Drill (APD) which have been submitted to BSEE under portions of 30 CFR 250 and less so under 30 CFR 550. These

Secure Times and Procedures were submitted to BOEM under 30 CFR 550.213(g)

The following chart illustrates the lines of communication in the field and from the field to the

shore base.Drilling Ice Management Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 26 July , 2014 

### Attachment 2

– Vessel Description

“ Noble Discoverer Specifications ”

NOBLE DISCOVERER SPECIFICATIONS

TYPE

- DESIGN Drillship

- Sonat Offshore Drilling Discoverer Class

SHAPE Monohull with sponsons added for ice

- resistance1

SHIP BUILDERS & YEAR Namura Zonshno Shipyard, Osaka, Japan

- hull number 355

YEAR OF HULL CONSTRUCTION 1965

YEAR OF CONVERSION 1976

DATE OF LAST DRY

- DOCKING 201 4

NOBLE DISCOVERER DIMENSIONS

LENGTH 514 ft 156.7 m LENGTH BETWEEN PERPINDICULARS (LBP) 486 ft 148.2 m
WIDTH 85 ft 26 m MAXIMUM (MAX) HEIGHT (ABOVE KEEL) 274 ft 83.7 m
HEIGHT OF DERRICK ABOVE RIG FLOOR 175 ft 53.3 m

NOBLE DISCOVERER MOORING EQUIPMENT Anchor pattern symmetric 8 point system. The unit is fitted with Sonat Offshore Drilling patented roller turret mooring system giving the unit the ability to maintain favorable heading without an interruption of the drilling operations

. ANCHORS Stevpris New Generation 7,000 kilograms (kg) each (ea) 15,400 pounds (lb) ea

. ANCHOR LINES Chain Wire Combination

SIZE/GRADE 2.75

- in. wire 3

- in. ORQ Chain

LENGTH 2,750 ft (838 m) wire + 1,150 ft (351 m) chain (useable) per anchor

NOBLE DISCOVERER OPERATING WATER DEPTH

MAX WATER DEPTH 1,000 ft (305 m) with present equipment (can be outfitted to 2,500 ft [762 m])Drilling Ice Management Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 27 July , 2014 MAX DRILLING DEPTH 20,000 ft 6,098 m

DRAW WORKS EMSCO E

- 2,100

- 1,600 horsepower (hp)

ROTARY National C

- 495 with 49 1⁄2

- in. opening

MUD PUMPS 2 ea. Continental Emsco Model FB

- 1600 Triplex Mud Pumps

DERRICK Pyramid 170 ft. with 1,300,000 lb nominal capacity

PIPE RACKING BJ 3

- arm system

DRILL STING COMPENSATOR Shaffer 400,000 lb with 18

- ft (5.5 m) stroke

RISER TENSIONS 8 ea. 80,000 lb Shaffer 50

- ft (15.2 m) stroke tensioners

CROWN BLOCK Pyramid with 9 ea. 60

- in. (1.5 m) diameter sheaves rated at 1,330,000 lb

TRAVELING BLOCK Continental

- Emsco RA60

- 6

BLOWOUT PREVENT E R (BOP) Cameron Type U 18 3⁄4

- in. (48 cm) x 10,000 pounds per square in. (psi)

RISER Cameron RCK type, 21

- in. (53 cm)

TOP DRIVE Varco TDS

- 3S, with GE

- 752 motor, 500 ton

BOP HANDLING Hydraulic skid based system, drill floor

NOBLE DISCOVERER DISPLACEMENT

FULL LOAD 20,253 metric tons (mt)

DRILLING 18,780 mt (Drilling, max load, deep hole, deep water)

NOBLE DISCOVERER DRAUGHT

DRAFT AT LOAD LINE 27 ft 8.20 m

TRANSIT 27 ft (fully loaded, operating , departure) 8.20 m

DRILLING 25.16 ft 7.67 m

NOBLE DISCOVERER HELIDECK

MAXIMUM HELICOPTER SIZE Sikorsky 92N

FUEL STORAGE 2 ea. 720

- gallon tanks

NOBLE DISCOVERER ACCOMODATIONS

NUMBER OF BEDS 140

SEWAGE TREATMENT UNIT Hamworthy ST

- 10

NOBLE DISCOVERER PROPULSION EQUIPMENT

PROPELLER 1 ea 15 ft 7

- in. (4.8 m) diameter, fixed blade

PROPULSION DRIVE UNIT Marine Diesel, 6 cylinder, 2 cycle, Crosshead type

HORSEPOWER 7,200 hp @ 135 revolutions per minute (RPM)

TRANSIT SPEED 8 knots

GENERAL STORAGE CAPACITIES

SACK STORAGE AREA 934 cubic meters (m3)

BULK STORAGE

Bentonite / Barite 180 m3

- 4 tanks

Bulk Cement 180 m3

- 4 tanks
LIQUID MUD

Active 1,200 barrels (bbl)

Reserve 1,200 barrels (bbl)

Total 1,200 barrels (bbl

POTABLE WATER 1,670 bbl / 265.5 m3 (aft peak can be used as add. pot water tank)

DRILL WATER 5,798 bbl / 921.7 m3

FUEL OIL 6,497 bbl / 1,033 m3

1 Sponsons designed and constructed to meet requirements of Det Norske Veritas (DNV Additional Class Notation

ICE

- 05Drilling Ice Management Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 28 July , 2014 

### “ Polar Pioneer Specifications ”Drilling Ice Management Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 29 July , 2014Drilling Ice Management Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 30 July , 2014Drilling Ice Management Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 31 July , 2014Drilling Ice Management Plan Chukchi Sea, Alaska

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Shell Gulf of Mexico Inc. 33 July , 2014Drilling Ice Management Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 34 July , 2014Drilling Ice Management Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 35 July , 2014Drilling Ice Management Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 36 July , 2014Drilling Ice Management Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 37 July , 2014 

### “ Nordica ” Specification

sDrilling Ice Management Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 38 July , 2014Drilling Ice Management Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 39 July , 2014Drilling Ice Management Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 40 July , 2014Drilling Ice Management Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 41 July , 2014Drilling Ice Management Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 42 July , 2014 

### “ Fennica ” SpecificationsDrilling Ice Management Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 43 July , 2014Drilling Ice Management Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 44 July , 2014Drilling Ice Management Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 4 5 July , 2014Drilling Ice Management Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 46 July , 2014Drilling Ice Management Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 47 July , 2014Drilling Ice Management Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 48 July , 2014 

### “ Tor Viking II ” Specifications

AHTS/Icebreaker Tor Viking II

- Main Characteristics

Design: KMAR 808 AHTS/ ICEBREAKER (Now; MOSSMAR)

Classification: DnV,+1A1, SUPPLY, SF, TUG ICEBREAKER ICE

- 10, DK(+) EO HELDK

- SH

DYNPOS

- AUTR HL(2,8) W1

- OC

Built / Delivered: Havyard Leirvik, Norway

- 03/2000 Registered / Flag: Skärhamn, Sweden

Dimensions Length Over All (LOA): 83.70 metres Length between p.p.: 75.20 metres Breadth, moulded: 18.00 metres Depth, moulded: 8.50 metres Draught (scantling): 7.20 metres Draught (design): 6.00 metres Freeboard (design): 2.50 metres Dead Weight: 2,528 tonnes Light Ship: 4,289 tonnes
Gross: 3,382 tonn es Net: 1,145 tonnes

Capacities Dry Bulk: 283 m 3 

### in 4 tanks

- totaling 10,000 ft 3



### Pot Water: 724 m 3



### Drill Water / Ballast: 1,205 m 3



### Brine: 400 m 3



### – SG 2.5

Oil Based Mud: 612 m 3



### – SG 2.8Drilling Ice Management Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 49 July , 2014 

### Base Oil: 242 m 3



### Fuel Oil: 1,190 m 3 

### Marine Gas Oil (Diesel)

Urea: 94 m 3



### Diesel Overflow: 21 m 3 

### with alarm Diesel Service / Settling: 2 x 20 m 3



### Deck Load: Abt 1,350 ts

Deck Area: 603 m 2 

### / 40.20 m x 15.0 m All products in dedicated tanks

– no dual purpose tanks

Propulsion Main Engine: MAK 18,300 BHP

- 4 eng (father/son) 2 x 3,840 kW + 2 x 2,880 kW = 13,440 kW Thrusters: Bow 1,200 BHP in tunnel (Electr) + 1,200 BHP 360 deg retractable = 2,400 BHP: Stern 1,200 BHP in tunnel Bollard Pull: Bollard Pull: 202 continuous (DnV certified) / Abt. 210 max pull Speed/Consumption: 16 knots

– Abt. 42.7 MT / 24 hrs at 6.0 metres draught , 12 knots

– Abt.

25.0 MT

Towing & Anchor H andling Equipment AHT Winch: Brattvaag towing/anchor handling winch 400 ts pull / 550 ts brake holding caps AHT Drum: One of 1,400 mm dia. x 3,750 dia

. x (1,250 mm + 1,250 mm) length Wire Capacity: 2 x 1,900 metres of 77 mm wire or 2 x 1,650 metres of 83 mm wire AH Drum: One of 1,400 mm dia. x 3,750 mm dia. x 3,000 mm length Wire Capacity: 4,100 metres of 83 mm wire

Winch Control: TOWCON 200 0 Automatic Control with printer

Pennant Reels : One off 2 x 1,500 m of 77 mm wire or 2 x 1,300 m of 83 mm wire capacity: One off 3,400 m of 77 mm wire or 1 x 3,100 m of 83 mm wire capacity Large Reel Inner Core: 1,500 mm dia

. Cable Lifters: 2 x 76 mm and 2 x 84 mm onboard Chain Lockers: 2 x 129 m 3 / giving abt 2 x 6,000 ft of 3 inch chain Shark Jaws: 2 pairs of Karm Forks arranged for chain up to 165 mm dia

. / 750 ts SWL Inserts for handling of 65, 75, 85, 100, and 120 mm dia. wire/chain

Stern Roller: One of 3,5 metres dia. x 6.0 metres length

– SWL 500 ts

Guide Pins: 2 pairs Karm Fork Hydraulic pins

– SWL 170 ts

Deck Equipment Capstans: 2 x 15 ts pull Tugger Winches: 2 x 15 ts pull

Smit Brackets: One bracket on B Deck Forward

– SWL 250 ts Cranes: 1 hydraul ic crane on fore cargo deck giving 6 / 12 ts at 20/10 m arm (360 deg) : 1 telescopic crane on aft cargo deck giving 1.5 / 3 ts at 15/10 m arm (360 degr) : 1 hydraulic crane on for

- castle deck for stores etc

. Windlass: 1 hydraulic windlass / mooring winch. 2 declutch

- able drums 46 mm K3 chain

Accommodation: Accommodation of a total of 23 persons, including crew. All accommodation equipped with air

- condition and humidification facilities.

Dynamic Positioning The vessel is equipped with Kongsberg Simrad SDP 21 Redundant DP System

– Green DP

.Drilling Ice Management Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 50 July , 2014 

### “ Aiviq ” SpecificationsDrilling Ice Management Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 51 July , 2014Drilling Ice Management Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 52 July , 2014 

### Attachment 3

– Shell Ice and Weather Advisory Center

Operational Support Overview

Safe and efficient offshore operations in the Arctic are contingent upon quality and timely ice and weather forecasts. Using state of the art satellite technology, large areas of the Beaufort and Chukchi Seas are monitored remotely by the SIWAC to track mo vement of ice and make estimates of its type and concentration.

Synthetic Aperture Radar (SAR) instruments on board the RADARSAT 2 satellite are contracted to acquire necessary images of sea ice over areas of interest several times per week. These images are transmitted to ground stations, processed, and made available for analysis within hours of acquisition. Interpretation of the ice edge and features are performed by experienced specialists using powerful mapping software to produce ice charts that are considerably more

detailed than those available from national ice centers. These charts are then distributed to operational personnel and planning managers and can be validated or ground

- truthed using actual ice regime assessments from the IMV fleet

.

Kn owing the location and composition of the ice at any given moment is a valuable tool;

however

, it is not enough. It is imp ortant to forecast how the ice may change over time. A complementary component of ice forecasting is quality weather information. Weat her conditions in the Arctic are among the most severe on the planet and change dramatically in a short time.

National weather services do not provide measurements and forecasts that sufficiently resolve the conditions over small areas or short time spans in the Arctic offshore. Therefore, dedicated meteorologists with Arctic forecasting experience are employed full time to produce accurate snapshots of the current conditions and reliable forecasts of weather conditions into the future.

Using global weather models, such as ECMWF and GFS numerical weather model as a starting point, the meteorologists produce a high resolution grid in proprietary modeling software of weather parameters, such as atmospheric pressure, wind speed, and wave height, that have been corrected based on local observations from Shell’s vessels at sea, meteorological buoys, and coastal weather stations. The result is a model that accurately reflects current and forecast

weather conditions over short distances in the Beaufort and Chukchi Seas, making marine operations and vessel transits safer and more responsible. Without this innovative forecast effort, weather products from other sources tend to describe the average or general conditions that one could expect over large areas, such as the entire U

. S

. Beaufort Sea, which results in local conditions rarely matching what is forecast.

The wind vectors, which are a set of points indicating the speed and direction of the wind distributed over the Beaufort and Chukchi Seas, and other output from the weather model are applied to the ice charts in the mapping software. This allows the ice analyst to assess the effect of wind and weather systems on the future movement and development of the ice.Drilling Ice Management Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 53 July , 2014 

### Attachment 4

– Ice Alert Logs

Ice Alert Level Log



## ICE ALERT LEVEL LOG

DRILLING UNIT

Date Time HT ST MT T

- Time Remarks Alert

Level MasterDrilling Ice Management Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 54 July , 2014 

### Ice Ale rt Level Notification



## Notice of Ice Alert Status Change

Drilling Unit

Date

Time

Previous Ice Alert Level

Ice Alert Arguments Hazard Time (HT) Secure Time (ST) Move Time (MT) Alert Time (AT)



## New Ice Alert

Present Ice and Weather Conditions

Forecast Ice and Weather Conditions

Comments

Approved By Master /OIM Signature

Date & TimeDrilling Ice Management Plan Chukchi Sea, Alaska

Shell Gulf of Mexico Inc. 55 July , 2014 

## Well Secure Time Log



## WELL SECURE TIME LOG

DRILLING UNIT

Date Time Well

Secure Time (ST) Initials

Remarks Initials

Rig Manager /

OIM Shell Drilling
Supervisor