PATENT CLAIM ANALYSIS

Application Number: 15960724
Application Type: Utility
Filing Date: 2018-04
Publication Date: 2019-08
Patent Classification: ["166", "354000"]

Abstract:
A mobile offshore drilling unit is converted to provide drilling, completion and workover access to multiple dry tree wells from a drilling derrick to allow production and export of oil and gas from high pressure, high temperature reservoirs in deep offshore waters. Existing practice has been for the drilling derrick on a production platform supporting dry tree wells to be moved over a fixed well slot. The present invention provides a movable wellbay that supports multiple top-tensioned subsea well tieback risers, which may be positioned directly below the derrick's rotary table and/or beneath another operating device. The use of top-tensioned subsea well tieback risers supported by the movable wellbay allows the converted facility to drill, complete, maintain, improve and produce from subsea wells through dry trees.

Claim (Index 11):
A method for retrofitting and repurposing an existing mobile offshore drilling unit (MODU) for service as a floating production facility capable of drilling and/or producing from wells penetrated into a subsurface (subterranean) oil and gas reservoir located beneath a body of water, comprising:\n the existing MODU comprising a drilling derrick, a moonpool, the drilling derrick secured to the drilling deck over the moonpool at a single location, and any one or more of the following 1) a marine drilling riser and tensioner system, 2) a subsea blowout preventer (BOP) and cart transport system, 3) marine drilling riser storage and handling equipment, 4) a dynamic positioning system comprising thrusters, 5) a power generation and management system, and 6) a positioning control system, the method comprising the steps of; (a) if one or more of the marine drilling riser and tensioner system, the subsea BOP and cart transport system, and the marine drilling riser storage and handling equipment are present, then removing the marine drilling riser and tensioner system, the subsea BOP and cart transport system, and the marine drilling riser storage and handling equipment, and if the marine drilling riser and tensioner system, the subsea BOP and cart transport system, and the marine drilling riser storage and handling equipment are not present, then proceeding with step (b); and (b) building and/or installing a structural assembly that is located completely in the moonpool, wherein the entire structural assembly is configured to be laterally and transversely movable at least for aligning at the single location a top end of first one riser of a set of two or more risers and then aligning at the single location a different riser of the set of risers below the drilling derrick, wherein the structural assembly has at least two riser holders, and wherein each riser holder is designed and built to hold a dynamic wire rope top-tensioned riser that is stretched between the riser holder and components at or near a seabed for production of hydrocarbons from the subterranean oil and gas reservoir.

Metadata:
- Claim Count in Document: 41.0
- Percentile: 91.0
- Lexical Diversity: 1.57471
- Patent Class: 166.0
- Transitional Phrase Type: open
- Component Type: 1
- Foreign Priority: False
- Related Applications: ['15482064', '13641909', '13052585', '10466131', '12990357']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.7998680371132914
- 35 USC 102 Novelty (BERT): 0.7322765620013235
- Combined Prediction Score: 0.7931088896020946
- Mean Citation Score: 453.166574
- Max Citation Score: 850.47266
- Similarity Product: 823.0233835131621

Labels:
- Claim Label 101: 1
- Claim Label 102: 1
- Claim Label 103: 1
- Claim Label 112: 1
- Combined Label: 1
- Label 101 Adjusted: 1

Dataset: test