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Collaborating Authors
Results
Laboratory Assessment and Field Pilot of Near Miscible CO2 Injection for IOR and Storage in a Tight Oil Reservoir of ShengLi Oilfield China
Ren, Bo (China University of Petroleum, China) | Xu, Yang (China University of Petroleum, China) | Niu, Baolun (China University of Petroleum, China) | Ren, Shaoran (China University of Petroleum, China) | Li, Xiangliang (Geology Research Institue of ShengLi Oilfield, Sinopec, China) | Guo, Ping (Geology Research Institue of ShengLi Oilfield, Sinopec, China) | Song, Xinwang (Geology Research Institue of ShengLi Oilfield, Sinopec, China)
Abstract Gas injection into tight oil reservoirs, as a secondary recovery technique, can be favorable and promising in terms of high gas injectivity and good displacement/sweeping efficiency over water injection. Particularly, CO2 injection is the best option due to its superior miscibility effect with oil and in consideration of geological storage of the greenhouse gas. In this study, CO2 injection into a tight oil reservoir for IOR is assessed and a pilot project is underway. The reservoir is located in the G89 Block of Shengli Oilfield East China, which has very poor water injectivity due to very low permeability of less than 5 mD in average, and has been producing via natural depletion since 2005. The original reservoir pressure was over 40 MPa, and the reservoir temperature of 126 . A CO2 injection and storage program has been proposed, and CO2 will be from a coal-fired power plant 30 km away under a Sinopec’s CCS (Carbon Capture and Storage) scheme. Laboratory investigation includes PVT experiments, slim tube test and core flooding/displacement experiments, in order to study the miscibility effect and displacement efficiency via CO2 injection at various conditions. Reservoir simulations were performed to predict the IOR potentials of CO2 injection at different pressures, namely at immiscible, miscible and near-miscible modes. The MMP (Minimum Miscibility Pressure) of the reservoir oil is determined as over 29 MPa, while the reservoir pressure at the beginning of CO2 injection was around 23 MPa after several years’ depletion. Therefore, CO2 flooding at a near miscible mode will prevail. A field pilot of CO2 injection at current reservoir conditions (at near-miscible mode) is designed and its performance is presented in the paper.
- Asia > China > Shandong Province (0.71)
- Europe > United Kingdom > North Sea > Central North Sea (0.61)
- Asia > Middle East > Qatar > Arabian Gulf > Rub' al Khali Basin > Al Shaheen Field > Shuaiba Formation (0.99)
- Asia > Middle East > Qatar > Arabian Gulf > Rub' al Khali Basin > Al Shaheen Field > Nahr Umr Formation (0.99)
- Asia > Middle East > Qatar > Arabian Gulf > Rub' al Khali Basin > Al Shaheen Field > Mauddud Formation (0.99)
- (13 more...)
Geology The "PF-A-I" reservoir is part of the "Pusztafoldvar field" in SE Hungary.The sandstone reservoir of Lower Pannonian age is located in the NW part of the field in depth between 1680-1740 meter. The reservoir is in a stratigraphic trap - combined with lithological changes. The reservoir rocks are clayey sandstone and aleurite with layers of claymarl interbeds. The inclination is 5 .The maximum reservoir thickness is 11 meter with the maximum net pay less than 6 meter (Figure 1.). The cored interval is close to 300 meter. The measured core porosity is between 11-29%. The permeability measurements are poorly documented and not representative because of the high heterogeneity of the reservoir. The average permeability was calculated from well test analysis (PBUs) which is significantly lower than the laboratory measurements.
- Energy > Oil & Gas > Upstream (1.00)
- Water & Waste Management > Water Management > Lifecycle > Disposal/Injection (0.45)