Study on the Contribution of Different Pore Throat Sizes to Oil Displacement Efficiency in Fracture-Pore Tight Sandstone Reservoir
DOI:
https://doi.org/10.54097/mmcwe737Keywords:
Tight Sandstone; Different Scale Hole Throat; Oil Displacement Efficiency; Contribution of Degree.Abstract
The pore throat and fracture system of tight sandstone reservoir are complex, the reservoir is highly heterogeneous, and the production often decreases rapidly, the development degree is low, and the development effect of water injection is poor. CO2 injection is an important means to supplement formation energy and achieve efficient reservoir development in tight reservoirs. Based on nuclear magnetic resonance technology (NMR) and high temperature and high pressure physical flow simulation experiment system, the contribution of different scales of pore throat and fracture to the improvement of oil recovery in different phases of CO2 -crude oil system is studied. The results show that the contribution of mesopores, macropores and fractures to oil displacement efficiency in the supercritical CO2 displacement stage reaches 74.58%. In immiscible CO2 displacement stage, the contribution of micropores, small pores and medium pores to oil displacement efficiency reached 73.27%. In the miscible CO2 displacement stage, the contribution of micropores and small pores to oil displacement efficiency reached 52.32%. In the supercritical CO2 displacement stage, the contribution of oil displacement efficiency is mainly provided by macropore throats and fractures. The contribution of immiscible and miscible CO2 displacement stage to oil displacement efficiency mainly comes from small pore throat with smaller scale.
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[1] Longwei Qiu, Xiangji Mu, Hao Li, et al. Influence of diagenesis of tight sandstone reservoir on the porosity development of Lower Shihezi Formation in Hangjinqi area,Ordos Basin. Petroleum Geology and Recovery Efficiency. Vol.26 (2019) No. 02, p. 42-50.
[2] Hailong Dang, Xiaofeng Wang, Pengxing Cui, et al. Research on the characteristics of spontaneous imbibition oil displacement with the low permeability tight-sandstone oil reservoir using the Nuclear Magnetic Resonance (NMR) technology. Progress in Geophysics (in Chinese). Vol.35 (2020) No. 05, p. 1759-1769.
[3] Weiyun Ma, Kai Huang, Peng Wang, et al. Mechanism of waterproof locking in tight sandstone gas reservoir based on low field nuclear magnetic resonance technology. Science Technology and Engineering. Vol.24 (2024) No. 04, p. 1459-1470.
[4] Chen Wang, Hui Gao, Yuan Gao, et al. Influence of Pressure on Spontaneous Imbibition in Tight Sandstone Reservoirs. Energy&fuels. (2020) No. 34, p. 9275-9282.
[5] Xiaoyu Gu, Chunsheng Pu, Hai Huang, et al. Micro-influencing mechanism of permeability on spontaneous imbibition recovery for tight sandstone reservoirs. Petroleum Exploration and Development. Vol.44 (2017) No. 06, p. 948-954.
[6] Xing Huang, Tiantai Li, Xiangzeng Wang, et al. Distribution characteristics and its influence factors of movable fluid in tight sandstone reservoir: a case study from Chang-8 oil layer of Yan-chang Formation in Jiyuan oilfield,Ordos Basin. Acta Petrolei Sinica. Vol.40 (2019) No. 05, p. 557- 567.
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