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Collaborating Authors
Williston Basin
Feasibility Study of Air Injection for IOR in Low Permeability Oil Reservoirs of XinJiang Oilfield China
Hou, Shengming (China University of Petroleum, Dongying 257061, China) | Ren, Shao Ran (China University of Petroleum, Dongying 257061, China) | Wang, Wei (China University of Petroleum, Dongying 257061, China) | Niu, Baolun (China University of Petroleum, Dongying 257061, China) | Yu, Hongmin (Sinopec, Beijing 100083, China) | Qian, Genbao (XinJiang Oilfield Co. Ltd., PetroChina, Kalamayi 834000, China) | Gu, Hongjun (XinJiang Oilfield Co. Ltd., PetroChina, Kalamayi 834000, China) | Liu, Baozhen (XinJiang Oilfield Co. Ltd., PetroChina, Kalamayi 834000, China)
Abstract Xinjiang oilfield is located in the Northwest of China, in which large oil reserves have been discovered in reservoirs with very low permeability (<14ร10ฮผm). These reservoirs are featured with light oil in moderate depth, high reservoir pressure, but relatively low reservoir temperature (65~78ยฐC) and low oil viscosity (<10mPaโขs). Primary production and limited water flooding experience have shown that the recovery factor in these reservoirs is very low due to lack of reservoir energy and poor water injectivity. Gas injection has been optioned as an alternative secondary or tertiary technique to maintain reservoir pressure and/or increase sweeping and displacement efficiency. In this study, the feasibility of air injection via a low temperature oxidation (LTO) process has been studied. Laboratory experiments were focused on LTO characteristics of oil samples at low temperature range and core flooding using air at various reservoir conditions. Reservoir simulation studies were conducted in order to predict the reservoir performance under the air injection scheme and to optimize the operational parameters. The oxygen consumption rates at reservoir temperature and IOR potentials at different reservoir conditions were assessed for a number of selected reservoirs in the region. A pilot project has been designed based on experimental data, reservoir simulation results and field experience of air injection gained in other regions of China. Issues related to safety and corrosion control during air injection and the project economics were also addressed in the paper.
- Asia > China (1.00)
- North America > United States > Texas (0.46)
- North America > United States > Oklahoma (0.29)
- North America > United States > South Dakota (0.28)
- Oceania > Australia > South Australia > Eromanga Basin (0.99)
- Oceania > Australia > Queensland > Eromanga Basin (0.99)
- Oceania > Australia > Northern Territory > Eromanga Basin (0.99)
- (13 more...)
Abstract Almost three decades have passed since the early exploration of the north Texas, Barnett Shale. The Barnett serves as an example study for the shale lifecycle. Operators in North America have used the Barnett-shale development as a roadmap for the exploration of new shale plays like the Marcellus, Haynesville, and Eagleford. Each new shale play is unique in nature with respect to geologic setting, lithology, and production mechanism. It is useful to have a defined strategy for the discovery, development, and decline phases of each individual shale play. The roadmap to shale well-completion designs should include the following key factors: Fracability: capability of the reservoir to be fracture stimulated effectively Producibility: capability of the completion plan to sustain commercial production Sustainability: capability of the field development to meet both economic and environmental constraints This paper reviews the evolution and development of completion practices of the major USA shale reservoirs in the last two decades and presents a roadmap for effective completion practices for shale stimulation. The completion roadmap uses the history of 16,000 shale frac stages in the Barnett, Woodford, Haynesville, Antrim, and Marcellus shales. Following the map through specific decision points will alter the path for individual shales. These decision points will be influenced by geologic, geochemical, and geomechanical information gathered along the way. The path toward a commercially viable shale play from the early asset-evaluation phase to late asset maintenance-and-remediation phase evolves from a series of decision trees throughout the process. Information presented in this paper provides a completion engineer with better understanding of the factors involved in shale-play stimulation and provides a methodical approach to select appropriate and optimum solutions that have evolved during the last two decades.
- Geology > Rock Type > Sedimentary Rock > Clastic Rock > Mudrock > Shale (1.00)
- Geology > Petroleum Play Type > Unconventional Play > Shale Play (1.00)
- Geophysics > Seismic Surveying > Passive Seismic Surveying > Microseismic Surveying (1.00)
- Geophysics > Borehole Geophysics (1.00)