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| Analysis on variation of effective pyrolysis zones in reservoir by in-situ heat injection production of oil shale |
| Received:October 30, 2021 Revised:December 14, 2021 |
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| DOI：10.7511/jslx20211030001 |
| KeyWord:oil shale in-situ mining convective heating temperature pressure stress |
| Author | Institution |
| 唐巨鹏 |
辽宁工程技术大学 力学与工程学院, 阜新 ;辽宁工程技术大学 新能源研究中心, 阜新 |
| 余泓浩 |
辽宁工程技术大学 力学与工程学院, 阜新 |
| 张昕 |
辽宁工程技术大学 力学与工程学院, 阜新 |
| 崔翰博 |
辽宁工程技术大学 力学与工程学院, 阜新 |
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| Abstract: |
| Aiming at dealing with the unclear change law of the effective pyrolysis zone of the reservoir during the in-situ heat injection production of oil shale, and the difficulties in assessing the actual pyrolysis effect, a numerical simulation method is used to study the Fushun oil shale reservoir, and the oil shale in-situ is established.The thermal-fluid-solid coupling mechanics model of heat injection production is compared with previous results to verify the reliability of the model.The analysis has obtained the effective pyrolysis area of the reservoir and the in-situ stress, steam injection pressure and subsidence in the effective pyrolysis area of the oil shale during the in-situ heat injection production process with the heat injection time.The result shows:The superheated steam flowing along the hydraulic fracturing fractures will not cause short circuit of the fracture channels, and the superheated steam can accelerate the pyrolysis of the oil shale reservoir through the hydraulic fracturing fractures.Using superheated steam convection to heat oil shale reservoirs is highly efficient.It only takes 1 year to make 96% of the oil shale reservoirs reach the required temperature for pyrolysis.During the pyrolysis process, a stress concentration zone is formed in the middle of the effective pyrolysis zone of the oil shale reservoir, and the maximum in-situ stress is 21.6 MPa.After pyrolysis, the rock formation near the heat injection well has subsided, and the maximum subsidence reached 0.85 m after 2 years of pyrolysis.The conclusions obtained provide guidance for in-situ heat injection production of oil shale on site. |
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