This paper describes the potential for enhanced coal bed methane production and CO 2 storage thro... more This paper describes the potential for enhanced coal bed methane production and CO 2 storage through the direct injection of flue as into virgin coal seams.
Introduction-Leakage through faults 2.0 Fault zone structure and permeability 2.1 Permeability of... more Introduction-Leakage through faults 2.0 Fault zone structure and permeability 2.1 Permeability of faults 2.2 Behaviour of faults during reactivation 2.3 Fault transmissibility multipliers associated with cross fault permeability 3.0 Faults as barriers and conduits 4.0 Natural analogues for CO 2 leakage through faults 5.0 Numerical simulation of CO 2 leakage through faults 5.1 A simple equation 5.2 Effect of leak-off into overlying layers 5.3 Effect of fault orientation 5.4 Effect of fault connectivity 5.5 On the role of thermodynamics 6.0 Summary and conclusions 6.1 Critical controls on Leakage 6.2 Potential leakage rates 6.3 Potential leakage duration 6.4 Variation of risk through storage life cycle 7.0 References 8.0 Tables and figures
Introduction-Leakage through caprocks 2.0 Reservoirs and caprocks 2.1 Permeability of intact capr... more Introduction-Leakage through caprocks 2.0 Reservoirs and caprocks 2.1 Permeability of intact caprocks 3.0 Capillary sealing 3.1 Air entry pressure and capillary pressure 3.2 Capillary bundle model 3.3 Static gas columns 3.4 Estimation of capillary threshold pressure by mercury intrusion 3.5 Effect of overpressure on capillary sealing 3.6 Expected CO 2 leakage through intact caprock 4.0 Caprock integrity 4.1 Tensile and shear failure 4.2 Pore-pressure coupling 5.0 Summary and conclusions 5.1 Critical controls on leakage 5.2 Potential leakage rate 5.3 Potential leakage duration 5.4 Variation of risk through storage life cycle 6.0 References 7.0 Tables and figures
The Telford field is an oil and gas accumulation located in the UK sector of the North Sea. As a ... more The Telford field is an oil and gas accumulation located in the UK sector of the North Sea. As a subsea tieback to existing production infrastructure this development might at first appear to be typical of many similar projects completed in recent years. However, the Telford story is interesting for two reasons. Firstly, the individual reservoirs making up the development are very different in nature and would be uneconomic on a stand alone basis. Secondly, the rapid development of the area to ensure maximum project value was a critical success factor. Achieving this hinged on the speedy resolution of a cross boundary equity issue which subsequently led to the formation of a joint operator sub-surface team for the reservoir development. This paper focuses on the sub-surface aspects of the development and how the application of state-of-the-art technology coupled with a phased approach has led to the development of what was previously considered to be a marginal field. The rapid comm...
Summary The Valhall field in the Norwegian North Sea is a high-porosity chalk reservoir undergoin... more Summary The Valhall field in the Norwegian North Sea is a high-porosity chalk reservoir undergoing primary pressure depletion. Over the last 10 years there have been a number of computer modeling studies of the field which have all assumed an original oil-in-place of approximately 2,000 MMSTB (318.0 × 106 m3). Despite this basic similarity, estimates of ultimate recoverable reserves have increased from an initial value of 200 MMSTB (31.8 × 106 m3) to the present estimate of 500 MMSTB (79.5 × 106 m3). This increase is partly due to the addition of wells and the optimization of completion techniques. However, the single most important and unique feature influencing Valhall long-term production performance is reservoir rock compaction. Recent simulation studies indicate that over half of the oil produced from the Valhall reservoir is a direct result of the rock compaction recovery mechanism. In the reservoir crest area rock compressibilities can be as high as 150 × 10−6 psi−1 (21.75 × ...
Summary The Ivanhoe/Rob Roy development consists of a floating production facility(FPF) serving t... more Summary The Ivanhoe/Rob Roy development consists of a floating production facility(FPF) serving two remote subsea production/injection production/injectionmanifolds and well clusters. These clusters, about 2 miles apart, consist ofnine production and six injection wells depleting five separate hydrocarbonaccumulations. The field development philosophy has centered on usingstate-of-the-art hardware and techniques to achieve optimum exploitation ofreserves. A strong emphasis on safety is reflected in all aspects of theproject from design to operation. This paper describes the development after 1year in operation. The approach taken will be of interest to other North Seaoperators contemplating marginal subsea tiebacks or stand-alonedevelopments. Introduction The lvanhoe and Rob Roy fields are located in the U.K. Sector, Block 15/21a, about 110 miles northeast of Aberdeen. Monsanto Oil Co. was awarded the blockas operator during the fourth U.K. licensing round in March 1972. Ivanhoe was...
Proceedings of European Petroleum Conference, 1992
This paper describes the design and performance of a temporary surface welltesting system capable... more This paper describes the design and performance of a temporary surface welltesting system capable of processing up to 20,000 BOPD. The system was designed to meet the requirements for the post-completion testing of subsea oilwells on a North Sea development. The paper will be of interest to engineers wishing to achieve high flowrates during testing operations on semi-submersible drilling rigs.
This paper describes the potential for enhanced coal bed methane production and CO 2 storage thro... more This paper describes the potential for enhanced coal bed methane production and CO 2 storage through the direct injection of flue as into virgin coal seams.
Introduction-Leakage through faults 2.0 Fault zone structure and permeability 2.1 Permeability of... more Introduction-Leakage through faults 2.0 Fault zone structure and permeability 2.1 Permeability of faults 2.2 Behaviour of faults during reactivation 2.3 Fault transmissibility multipliers associated with cross fault permeability 3.0 Faults as barriers and conduits 4.0 Natural analogues for CO 2 leakage through faults 5.0 Numerical simulation of CO 2 leakage through faults 5.1 A simple equation 5.2 Effect of leak-off into overlying layers 5.3 Effect of fault orientation 5.4 Effect of fault connectivity 5.5 On the role of thermodynamics 6.0 Summary and conclusions 6.1 Critical controls on Leakage 6.2 Potential leakage rates 6.3 Potential leakage duration 6.4 Variation of risk through storage life cycle 7.0 References 8.0 Tables and figures
Introduction-Leakage through caprocks 2.0 Reservoirs and caprocks 2.1 Permeability of intact capr... more Introduction-Leakage through caprocks 2.0 Reservoirs and caprocks 2.1 Permeability of intact caprocks 3.0 Capillary sealing 3.1 Air entry pressure and capillary pressure 3.2 Capillary bundle model 3.3 Static gas columns 3.4 Estimation of capillary threshold pressure by mercury intrusion 3.5 Effect of overpressure on capillary sealing 3.6 Expected CO 2 leakage through intact caprock 4.0 Caprock integrity 4.1 Tensile and shear failure 4.2 Pore-pressure coupling 5.0 Summary and conclusions 5.1 Critical controls on leakage 5.2 Potential leakage rate 5.3 Potential leakage duration 5.4 Variation of risk through storage life cycle 6.0 References 7.0 Tables and figures
The Telford field is an oil and gas accumulation located in the UK sector of the North Sea. As a ... more The Telford field is an oil and gas accumulation located in the UK sector of the North Sea. As a subsea tieback to existing production infrastructure this development might at first appear to be typical of many similar projects completed in recent years. However, the Telford story is interesting for two reasons. Firstly, the individual reservoirs making up the development are very different in nature and would be uneconomic on a stand alone basis. Secondly, the rapid development of the area to ensure maximum project value was a critical success factor. Achieving this hinged on the speedy resolution of a cross boundary equity issue which subsequently led to the formation of a joint operator sub-surface team for the reservoir development. This paper focuses on the sub-surface aspects of the development and how the application of state-of-the-art technology coupled with a phased approach has led to the development of what was previously considered to be a marginal field. The rapid comm...
Summary The Valhall field in the Norwegian North Sea is a high-porosity chalk reservoir undergoin... more Summary The Valhall field in the Norwegian North Sea is a high-porosity chalk reservoir undergoing primary pressure depletion. Over the last 10 years there have been a number of computer modeling studies of the field which have all assumed an original oil-in-place of approximately 2,000 MMSTB (318.0 × 106 m3). Despite this basic similarity, estimates of ultimate recoverable reserves have increased from an initial value of 200 MMSTB (31.8 × 106 m3) to the present estimate of 500 MMSTB (79.5 × 106 m3). This increase is partly due to the addition of wells and the optimization of completion techniques. However, the single most important and unique feature influencing Valhall long-term production performance is reservoir rock compaction. Recent simulation studies indicate that over half of the oil produced from the Valhall reservoir is a direct result of the rock compaction recovery mechanism. In the reservoir crest area rock compressibilities can be as high as 150 × 10−6 psi−1 (21.75 × ...
Summary The Ivanhoe/Rob Roy development consists of a floating production facility(FPF) serving t... more Summary The Ivanhoe/Rob Roy development consists of a floating production facility(FPF) serving two remote subsea production/injection production/injectionmanifolds and well clusters. These clusters, about 2 miles apart, consist ofnine production and six injection wells depleting five separate hydrocarbonaccumulations. The field development philosophy has centered on usingstate-of-the-art hardware and techniques to achieve optimum exploitation ofreserves. A strong emphasis on safety is reflected in all aspects of theproject from design to operation. This paper describes the development after 1year in operation. The approach taken will be of interest to other North Seaoperators contemplating marginal subsea tiebacks or stand-alonedevelopments. Introduction The lvanhoe and Rob Roy fields are located in the U.K. Sector, Block 15/21a, about 110 miles northeast of Aberdeen. Monsanto Oil Co. was awarded the blockas operator during the fourth U.K. licensing round in March 1972. Ivanhoe was...
Proceedings of European Petroleum Conference, 1992
This paper describes the design and performance of a temporary surface welltesting system capable... more This paper describes the design and performance of a temporary surface welltesting system capable of processing up to 20,000 BOPD. The system was designed to meet the requirements for the post-completion testing of subsea oilwells on a North Sea development. The paper will be of interest to engineers wishing to achieve high flowrates during testing operations on semi-submersible drilling rigs.
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Papers by Stephen Jewell