A Case Study: Field Development Plan for a Highly Overpressured Gas Reservoir in China by a Multidisciplinary Consulting Team
- Haiping Li (PetroChina) | Hongjie Xiong (Schlumberger) | James Wang (Schlumberger) | Rolf J. Broetz (Schlumberger) | Hilary Azoba (Schlumberger) | Thomas A. Ryer (Schlumberger) | Gary D. Miller (Schlumberger) | Tami Chism Rahn (Schlumberger) | Nicholas A. Wiltgen (Schlumberger) | Brad M. Robinson (Schlumberger) | Ralph L. Kugler (Schlumberger) | Donald W. Lee (Schlumberger) | Richard A. Plumb (Schlumberger) | Ron Martin (Schlumberger) | John Spivey (Schlumberger) | Longde Sun (PetroChina) | Wenjie Song (PetroChina)
- Document ID
- Society of Petroleum Engineers
- SPE Annual Technical Conference and Exhibition, 29 September-2 October, San Antonio, Texas
- Publication Date
- Document Type
- Conference Paper
- 2002. Society of Petroleum Engineers
- 1.14 Casing and Cementing, 5.6.9 Production Forecasting, 2.4.3 Sand/Solids Control, 4.1.5 Processing Equipment, 7.2.1 Risk, Uncertainty and Risk Assessment, 5.1.1 Exploration, Development, Structural Geology, 1.6.9 Coring, Fishing, 4.2 Pipelines, Flowlines and Risers, 5.8.2 Shale Gas, 2 Well completion, 5.6.4 Drillstem/Well Testing, 5.1.7 Seismic Processing and Interpretation, 5.1 Reservoir Characterisation, 5.5.3 Scaling Methods, 1.5 Drill Bits, 5.5 Reservoir Simulation, 1.8 Formation Damage, 3.3 Well & Reservoir Surveillance and Monitoring, 1.14.1 Casing Design, 5.7 Reserves Evaluation, 1.2.2 Geomechanics, 5.1.2 Faults and Fracture Characterisation, 5.6.1 Open hole/cased hole log analysis, 1.11 Drilling Fluids and Materials, 2.2.2 Perforating, 5.5.2 Core Analysis, 2.7.1 Completion Fluids, 5.5.8 History Matching, 1.6 Drilling Operations, 4.2.3 Materials and Corrosion, 5.1.5 Geologic Modeling, 5.1.4 Petrology, 1.2.3 Rock properties, 4.3.1 Hydrates, 5.2.1 Phase Behavior and PVT Measurements, 4.6 Natural Gas
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Operating companies generally produce their own field development plans (FDPs). Schlumberger Data and Consulting Services, a consulting group within an oilfield services company, was hired by PetroChina to perform a multidisciplinary integrated study on a highly overpressured gas reservoir, the Kela 2 field in the Tarim basin. The field has reserves exceeding 10 Tcf and will provide much of the gas for a major pipeline crossing China from the Tarim basin to Shanghai. The study consisted of building comprehensive geologic and reservoir models, estimating reserves, performing dynamic production and performance analyses on the reservoir, and providing an optimal FDP, which includes the drilling and completion designs, production engineering, reservoir monitoring and management, optimal implementation methods, and best practices.
This paper describes a comprehensive FDP technical approach and workflow designed to ensure both seamless integration of the disciplines and high-quality work. The technical approach incorporates the construction of a database, geological reservoir and mechanical earth models, a reservoir dynamic model, a single-well model, a development design model, and an economics and risk model. The paper summarizes our experience in assembling a multidisciplinary team, promoting effective teamwork, and quality control (QC).
Kela 2 gas field is situated on the northern edge of the Tarim basin (Fig.1). The reservoir was discovered in 1997. Kela 2 is an overpressured dry gas reservoir with normal temperature. Schlumberger performed a multidisciplinary integrated study on the Kela 2 gas reservoir for PetroChina. The study included building comprehensive geologic and reservoir models, estimating reserves, performing dynamic production and performance analyses on the overpressured gas reservoir, and providing an optimal FDP, including the drilling and completion designs, optimal implementation methods, and best practices.
A comprehensive Schlumberger FDP technical approach was employed to ensure seamless integration of the disciplines and high-quality work. The technical approach incorporates the construction of a database, a geological reservoir model, a mechanical earth model, a reservoir dynamic model, a single-well model, a development design model, and an economic and risk model.
Gas was discovered in the Kela 2 well in 1997. Before drilling the discovery well, the productive structure was defined by means of 2D seismic surveys. Additional seismic shots guided subsequent drilling of five delineation wells.
The reservoir formation, interpreted to be of fluvial origin, consists of sandstone with minor amounts of silty mudstone. The sandstone is generally fine- to medium-grained sublitharenite and feldspathic litharenite. The framework consists of mechanically stable grains derived from a metamorphic terrain. Matrix materials consist largely of pseudomatrix formed by deformation of mudstone intraclasts.
Gas in the Kela 2 structure is overpressured. Maximum pressures for all wells are two times hydrostatic pressure. This value lies in two-thirds to three-quarters the distance between the normal hydrostatic gradient for salt water and the fracture gradient for the rocks. The origin of the overpressure is unclear. It may be simply the result of uplift of a previously gas-charged reservoir section to a shallower depth during deformation by thrusting. Alternatively, the overpressure could be the result of gas generation within a sealed compartment of rock.
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