bluuebunny/crossref_metadata_2025_split huggingface dataset:
Decision Analysis Approach to Valuing Integrated Drilling Operations in the North Sea
Authors: Strasunskas Darijus , Rajaieyamchee Mohammad A. 
Published: July 2010

AbstractRecently, the petroleum industry has capitalized on remarkable information and collaboration technologies that bring vast amount of real-time data to the decision-makers. The goal is to improve their decision-making processes by integrating technology, people, work processes, and organizations. However, complexity of drilling operations and investment costs put industry in quest for a feasible method to valuate benefits. The prevailing evaluation methods are usually restricted to qualitative approaches, and thus are inefficient as decision aids. The paper presents a decision analytic approach to quantitative valuation of integrated operations.The proposed valuation method is illustrated by a case from improving decisions’ quality in drilling operations in the North Sea. Improving the quality of operational decisions requires the drilling team to have access to the relevant information in a timely manner. The relevant information needs to be filtered, aggregated, and fused into decisions; and correspondingly represented to the decision-maker. Availability of new information allows making new decisions, and changing work processes. Adoption of a new tool, conformance to a new work process and trust in aggregated and shared information are typically critical success factors. The method is designed to qualitatively analyze changes in intangible capital and assess technology adoption under conditions of operational and economical uncertainties.The method accounts for information quality improvements and related uncertainties management. In turn, decision analytical part of the method provides a means to relate observable improvements in Key Performance Indicators (KPIs) and uncertainties. Operational decisions are formalized using influence diagram, a.k.a. Bayesian decision network.Implementation of digital fields and integrated operations is technologically and organizationally challenging. The functional steps of the established methodology and the decision analytic approach are significant contributions to understanding the quantitative value of these projects.
How an Enhanced HSEQ Management Leads to a More Internationally Mobile Workforce
Authors: van der Ende Jean-Paul , Ammous Nejib 
Published: July 2010

Abstract
Tunisia is an area of growing Oil and Gas activity. A number of National Oil Companies are active within Tunisia. This paper focuses specifically upon SEREPT, which has its head office in Tunis and its main operating base in Sfax. It has operations in the Gulf of Gabes (Offshore platform complex) and 2 smaller production sites in the West of the country, near the border with Algeria.
SEREPT was founded almost 80 years ago, originally focussing on exploration. In the 90’s it was operated by Elf Aquitaine (then Arco and Preussag), but since 2003 it is in a Joint Venture with the Tunisian ETAP (Entreprise Tunisienne d’Activites Petrolieres) and the Austrian OMV. Only within the last decade has HSEQ management become an integral way of doing things. SEREPT aligned with the OMV E&P HSEQ management systems, supported by ETAP, bringing about an enhancement in HSEQ management.
Improved HSEQ performance has been visible within SEREPT as evidenced through upward trends in achievement of HSEQ Objectives and overall HSEQ competencies in the workforce. Actual SEREPT HSEQ statistics since 2005 demonstrate this. This enhancement is a double edged sword in that it has led to an improvement in HSEQ performance for the company and HSE competence of its personnel. The adverse affect of this is the ongoing exodus of experienced and qualified local personnel to international operators. This effect has then created an HSEQ vacuum resulting in a gradual dip in HSEQ performance. So, the benefits of HSEQ improvement have had a knock-on effect for SEREPT and this need to be addressed. This paper will be supported by actual studies undertaken by third parties that have empirically demonstrated an improvement in HSEQ performance over the years, but also the emigration of key personnel, causing an HSEQ vacuum. It will also provide some suggestions as to how this problem may be reversed.
Analysis of Pressure Transient Date With Account of Influence Gas-liquid Compositions Flow In Inclined-directed Wells
Authors: Karnauhov M. L. 
Published: July 2010

Abstract
For regulation and management of development process of oil and gas fields on them various kinds of researches are continuously spent. In a complex of these researches the main things are well testing, which performance the periodic stop of well and carrying out of various regimes of it working and record the pressure build–up curves is required.
At the same time it is essential to raise quality of layer researches and reliability of the information on storage development of oil or gas. It would be possible at performance of continuous gauging well bore pressure in working wells. Complexity of carrying out of such researches is connected with necessity of performance of gauging for wells equipped pump installations.
There are various means of registration well bore pressure (remote gauges of pressure, temperatures, etc.). However such means basically are focused on an assessment of works of deep pumps and are not used as sources of the information
Laboratory Investigation on Gelation Behavior of Xanthan Crosslinked With Borate Intended to Combat Lost Circulation
Authors: Mokhtari Mehdi , Ozbayoglu Even M. 
Published: July 2010

AbstractCrosslinked polymer gels have been extensively used in upstream petroleum industry for water shut-off, profile modification and hydraulic fracturing. The successful history of those applications has led to opening of a new frontier for solving one of the most severe and costly drilling problems known as lost circulation. Xanthan chains can be crosslinked by borate ions released from borax in appropriate pH conditions and consequently convert to a three-dimensional gel structure that can block thief zones.Steady shear viscometry method was applied in which the gel system was under constant shear rate while apparent viscosity had been recording. Apparent viscosity is almost constant up to initial gelation time in which viscosity starts growing up. Initial and final gelation times, initial and final viscosities are parameters that can describe the behavior of a gel system and are reported in this paper. The effects of concentrations of xanthan blended with borax, a pH-controller, and magnesium chloride as well as mixing time, shear history and temperature were investigated. Moreover empirical models are suggested for prediction of initial and final gelation times/viscosities as a function of the above-mentioned variables.Although the initial gelation time decreases when mixing periods increases, the summation of those is constant. In other words, the reaction causing gelation cannot be postponed by mixing. This is also true when the gel is at rest. On the other hand, it was observed that gels with high-shear rate history demonstrate similar initial gelation time as gels under 3 rpm steady shear. Moreover this low shear rate was found to not interfere in initial gelation time. Temperature and pH-controller reduce the time required for initiation of gelation. Magnesium chloride reduces the viscosity. Consequently the final gel is weaker and occurs in a longer time. Xanthan blended with borax contributes to the system mainly by increasing the viscosity. Finally the empirical models can be used to manage lost circulation treatment job. They help to have enough time to pump the pill with a known viscosity and wait enough on a gel with a desired quality.
Underbalanced Drilling Technology adds Reserves and Enhances Ultimate Recovery
Authors: Babajan Salar , Qutob Hani 
Published: July 2010

Abstract
The current world petroleum industry situation is that:➢Exploration is difficult and costs are increasing.➢The majority of hydrocarbons being exploited today are found in existing pressure depleted or complex and lower quality reservoirs➢Current oil prices are up-and-down
Thus, world circumstances have forced today’s petroleum industry to rethink both its operating methods and technologies aiming at improving recovery and reducing cost. It is believed that adoption of new technologies is the most important factor in adding reserves, enhancing recovery, reducing cost and increasing revenue. Underbalanced drilling technology is now seen as the way to achieve these objectives.
Realising Opportunities Using Integrated Production Modelling in Occidental of Sultanate of Oman
Authors: Al Lawati M.. , Al Salmi A.. , Al Kharusi A.. , Al Hajri S.. , Al Siyabi I.. 
Published: July 2010

Abstract
Integrated Production Model IPM is a numerical simulation model using rigorous physics to describe the behavior of an entire production system and produce optimization soulutions of any operated field by integrating the reservoir models, well models and the surface network model.
Integrated production model using IPM suite (Petex) was implemented in field X mainly operated with gas lifted production system, which is located in the North of Sultanate of Oman. This is a distinguished, proactive and creative process of searching and realizing opportunities that are occuring in daily life of a producing gas lift field.
The process has included four phases. First phase was characterizing, predicting phase behavior and dynamic fluid properties of reservoir fluid. Second phase was building field reservoir models in MBAL using material balance simulation. This helps predicting reservoir pressure and forecasting senarios. Third phase was modeling all wells in Prosper including all subsurface mechanical components and generate the vertical lift curves to examine production performance of the well at different welltest and reservoir pressure conditions. The last phase was building surface network model GAP and link that to all the reservoirs and wells models. At this point system response was validated and calibrated to represent actual field status.
Going through the process of integrated production system modeling resulted in an increase of 8% of total field production by individual wells optimization. In addition more than 25% of gas lifted gas was saved through optimum distribution of lifting gas among the producers.
El Borma - Bright Water®: A Tertiary Method for Enhanced Oil Recovery for a Mature Field
Authors: Ghaddab F.. , Kaddour K.. , Tesconi M.. , Brancolini A.. , Carniani C.. , Galli G.. 
Published: July 2010

Abstract
For some years SITEP and Eni have started to evaluate certain tertiary methods of enhaced oil recovery for El Borma, a mature tunisian field. A pilot project based on the application of a commercial chemical product called "BRIGHT WATER®" (BW), a trademark of Tiorco-Nalco, was chosen to verify on a real case its applicability and efficiency. The technology aims at the improvement of the oil recovery and at the reduction of the water production. This methodology is applied for oil mature fields, that are subjected to the water injection and that are presenting a heterogeneous reservoir with contrast of permeability. This paper describes the work performed to design a field test of such a technique in El Borma, with the twofold purpose to achieve the highest probability of success and gather as much information as possible to use in future applications. The project went through four phases: 1. Selection of one injector well and one producer; 2. Program of monitoring to verify the connection between the injector and the producer (injection of a tracer to determine the arrival time and simulation on a numerical model); 3. Injection of the polymerics and monitoring; 4. Application on the other zones of the field, in case of the success of the method. The first three phases were completed at the beginning of 2010. This work also describes the workflow which will be established to follow the improvements of the oil production.
Flexural Distortion Analysis of the Mandrel in an Orienting Rotary Steerable Drilling Tool
Authors: Jiang Shan 
Published: July 2010

Abstract
The design of orienting rotary steerable drilling tools needs to take both the location of the floating support points and flexural distortion of the mandrel into account. With consideration of the eccentric displacement and bias of offset components in such a biasing apparatus, a comprehensive mechanical model has been proposed in this paper to determine key parameters and to guide the design of orienting rotary steerable drilling tool. It is assumed this mathematical model that 1) the eccentric force is concentrated at one point of a mandrel; 2) one end of the mandrel is hinged; and 3) the other end may slide along the axial direction on the support point. The relationship between flexural distortion curve and the axial offsetting (λ) of a mandrel can then be found. The proposed model and the analysis can be used to guide the design of orienting rotary steerable drilling tools.
Establishment of a Sand Production Prediction Model for Inclined Casing Perforated Well
Authors: Xie Shuangxi , Yiwei Ren , Zhousheng Chen 
Published: July 2010

Abstract
Referring to the casing perforated wells and based on linear-elastic theory, the stress around borehole and perforations of deviated well is analyzed and the influence of stress distribution around borehole and perforations is also fully considered. In the paper, the conception of two formation stability coefficients respectively based on Mohr-Coulomb yield criterion and Drucker-Prager yield criterion is presented. Stress around perforations and Drucker-Prager yield criterion are used to establish a sand production prediction model and prediction software was programmed. Finally, the sand production is predicted for the well W1 by the model and the predicted result is almost identical with realistic situation.
Research for Horizontal Well Reasonable Drawdown Pressure of Heavy Oil Reservoir with Bottom Water
Authors: Li Tingli , Ge Lizhen , Zhao Chunming , Yang Qinghong , Liao Xinwu , Chai Shichao , Qin Wei , Xu Yuxia , Xiao Kun , Bie Xuwei 
Published: July 2010

Abstract
In this paper we detail the work done in rearch for horizontal well reasonable drawdown pressure of heavy oil reservoir with bottom water based on detailed analysis of the geological, reservoir, production history, horizontal well data and production conditions with the intent to enhance rate and recovery efficiency in a heavy oil reservoir with bottom water. We study the geological, reservoir, production history and horizontal well data relate to optimizing horizontal well reasonable pressure drawdown in a heavy oil reservoir with bottom water, like reservoir thickness, horizontal well standoff over oil water contact, honrizontal section length, barriers distribution and viscosity in-place oil. This paper breaks up the past development idea of controlling horizontal well drawdown pressure to delay bottom water conning, and a new theory to high efficiency develop bottom water reservoir is present. This new development theory comes from geology & reservoir and takes production conditions on sea into account, has strong base of theory and practicability.
A combination of geological, reservoir and production history is considered to optimize horizontal well pressure drawdown. Through the work done we are able to identify the reasonable pressure drawdown with every horizontal well including on production and planning. And we are able to identify how much these factors affect optimizing horizontal well pressure drawdown. There are 27 horizontal wells to develop heavy oil reservoir with bottom water at QHD32-6 Oilfield, and next step more horizontal wells will drilled. Some horizontal wells produce poorly because bottom water coning quickly, these wells obtain successful production after enlarging drawdown pressure and accumulative oil production exceed those wells with small drawdown pressure to delay bottom water conning.The rate and recovery efficiency in QHD32-6 Oilfield have been increased largely after this pressure drawdown optimization.
The paper details techniques for pressure drawdown optimization in heavy oil reservoir with bottom water, and indicates high efficiency recovery by horizontal wells in heavy oil reservoir with bottom water is obtainable. This development idea has been applied to several fields at Bohai bay including QHD32-6, CFD11-1, SZ36-1 and CB. Producing practice have testified that high recovery rate for horizontal well of heavy oil reservoir with bottom water is very successful.
An Effective Experience on Reducing the Power Consumption and Produced Water Drainage of Boxi Oilfields
Authors: Junxiong Yu , Zhehua Wen , Liang Geng 
Published: July 2010

Abstract
Part of the produced water of Boxi oilfields was separated from the produced fluid in the central platform to be treated, reinjected and drained, and the remained fluid was piped to the terminal onshore, then the remained produced water was treated and drained onshore. The amount of produced water drained onshore was getting more and more, and a target to reduce the amount of produced water drained, especially onshore, was set to meet the improvement on the environmental protection policy of the government.
In order to reduce the amount of produced water treated and drained onshore and to reduce piping energy consumption, by means of improving the capacities of the separation, treatment and reinjection offshore, most of the produced water in the main production platform was separated from the produced fluid and treated and reinjected through updating the process system in the crowded platform by means of gas and fluid separation by GLCC etc; and the efficiency of produced water treatment has been improved through updating the process system onshore and in the central platform.
The amount of produced water drained onshore was cut by more than 60%. The target to reduce the amount of produced water drained onshore was reached, and the piping energy consumption has been reduced accordingly.
It is an innovation in Bohai Bay to use GLCC to separate gas and fluid in the process system. The job has given an example of sustainable development for the oilfields in their later stage in Bohai Bay.
Pay Zone Protection during Drilling in Offshore Oilfield Producing with High Porosity, High Permeability and Low Pore Pressure
Authors: Deng Jianming , jianmin Deng , xiaocheng Zhang , wenbo Tang , zili Li , hailong Miao 
Published: July 2010

Abstract
When drilling infill wells in heavy oil oilfields of Bohai Bay after over teen years production, there are three challenges to achieve ideal production rate. The first one is wellbore stability in unconsolidated sandstone formation. The second one is risks of pollution and damage in pay zone with high porosity and high permeability. The third one is risks of mud loss and pollution in lower pressure pay zone after producing many years. CNOOC developed a reasonable technique according to the characteristics of pay zones, experiences of production and drilling. After successful applications, CNOOC formulated a good technique series which consists of membrane forming mud, completion fluid and flow-back in time. Production rate of the fifteen wells drilled achieved or exceeded the production allocation. This achievement is successful experiences to improve oil recovery rate and raise recoverable reserves and production rates.
Lessons Learned from a Well's Sand Control Failure in Bohai Bay
Authors: Chen S. H. , Deng J. M. , Fan B. T. , Li Bin , Xu R. Q. 
Published: July 2010

Abstract
This paper describes sand control failure of a well in Bohai Bay which has experienced four workovers and one acid treatment. This well adopted cased-hole premium screen completion initially, changed to another premium screen completion in the 2nd workover and gravel packed in the 4th workover. An extensive data collection and analysis were performed to relate the cause of sand control failure to reservoir data, formation sand characteristics, sand control method, premium screen sizing and so forth. Comparison between targeted well and offset wells has also been conducted to evaluate which kinds of sand control methods are appropriate for the given formation. A number of design and operational guidelines have been suggested for a suitable completion method.
Prediction of Hole Cleaning Efficiency Using a Simple, User Friendly and Better Performing Simulation Model
Authors: Qahtani Abdullah M. , Amanullah Md. 
Published: July 2010

Abstract
The effective removal of drill cuttings from the wellbore is one of the key factors to avoid different drilling problems such as poor ROP, associated cuttings bed formation in the presence of weak mudcakes, embedded cuttings bed formation in the presence of poor quality mudcakes, creation of hole pack-off and pipe sticking problems, significant change in mud properties, increase in the severity of formation damage potential of drilling muds, etc. Poor hole cleaning may also trigger induced loss of circulation, borehole instability, kicks, blowout and other borehole problems due to the direct or indirect consequences of improper hole cleaning. Therefore, an accurate and reliable prediction of hole cleaning efficiency of drilling mud in different drilling condition is an inseparable part of a safe and economic drilling operation. An improved prediction tool could provide the necessary guidelines to take appropriate measures while drilling to avoid drill cuttings associated borehole problems. This paper describes a simple, user friendly and more reliable simulation model to predict the hole cleaning efficiency of drilling mud in different borehole conditions using some critical parameters associated with drilling mud, hole geometry, subsurface condition, and the cuttings properties.
Ensemble Methods for Reservoir Life-Cycle Optimization and Well Placement
Authors: Leeuwenburgh Olwijn , Egberts Paul J. , Abbink Oscar A. 
Published: July 2010

Abstract
Several simple examples are presented that demonstrate the application of an ensemble-based method to production optimization. In particular, some practical aspects of the method such as ensemble size, perturbation, regularization and smoothing, and robust gradient estimation are discussed by comparison with an adjoint approach. The controls in the presented examples are inflow control valve settings for fixed time intervals or well position. We find that the performance of the method is clearly affected by the correlation time scale that is assumed for the controls, as reflected both by the quality of the gradient estimation and the subsequent optimization. The well placement optimization problem is studied for two cases: one is a homogenous reservoir with a sealing fault, and the other a non-homogeneous case. The ensemble optimization method is found to work well for both these simple well placement problems.