Numerical simulation analysis on the development effect of vertical well and horizontal well during oil shale autothermic pyrolysis in-situ conversion process: a case study of oil shale in Xunyi area, Ordos Basin

被引：0

作者：

Lihong Y. ^{[1
]}

Chaofan Z. ^{[2
,3
,4
,5
]}

Hao Z. ^{[1
]}

Jianzheng S. ^{[1
]}

Yiwei W. ^{[1
]}

Junwen W. ^{[1
]}

Xudong C. ^{[1
]}

Wei G. ^{[2
,3
,4
,5
]}

机构：

[1] Sinopec Petroleum Exploration & Production Research Institute, Beijing

[2] College of Construction Engineering, Jilin University, Changchun, Jilin

[3] Natl.-Loc. Jt. Eng. Lab. of In-situ Conversion, Drilling and Exploitation Technology for Oil Shale, Changchun, Jilin

[4] Provincial and Ministerial Co-construction of Collaborative Innovation, Center for Shale Oil & Gas Exploration and Development, Jilin University, Changchun, Jilin

[5] Key Lab. of Min. of Natural Resources for Drilling and Exploitation Technology in Complex Conditions, Jilin University, Changchun, Jilin

来源：

Shiyou Xuebao/Acta Petrolei Sinica | 2023年 / 44卷 / 08期

关键词：

energy return; horizontal well; in-situ conversion process (ICP); oil shale; vertical well; Xunyi area;

D O I：

10.7623/syxb202308009

中图分类号：

学科分类号：

摘要：

Oil shale, as a major fossil energy, is an important alternative resource for conventional oil and gas. In-situ conversion process (ICP)is characterized by environmental protection, small footprint and low development cost, which can be used to exploit deep oil shale resources, as being the development trend of oil shale industry. Several in-situ conversion pilot tests in China have successfully produced shale oil by vertical well, yet there are still shortcomings such as low productivity, instability and low sweep efficiency. This paper is a case study of oil shale formation in Xunyi area, and the numerical simulation method is used to compare the development effects of vertical and horizontal wells during autothermic pyrolysis in situ conversion process (ATS)of oil shale. The results show that the local maximum temperature of ATS of oil shale in Xunyi area exceeds 1 000°C. The oil saturation zone is mainly distributed in the temperature range of 250 C to 350°C, and the local maximum oil saturation can reach 72 %. The kerogen cracking mainly occurs in the formation at the temperature of 350°C, and after that the porosity is increased from 6. 4% to 15.5%. Specifically, the cumulative oil production during ATS in vertical wells amounts to 432 m3, and the highest daily oil production hits 1. 85 m3 per day; the cumulative oil production of horizontal wells is up to 7 260m3, and the highest daily oil production is 46. 7m3 per day. The total energy return during ATS by vertical wells is only 0. 79, while that by horizontal wells is up to 2. 48. Moreover, the optimal shut-in time during ATS of oil shale by vertical wells and horizontal wells is after 4. 5 years and 7 years, respectively. © 2023 Science Press. All rights reserved.

引用

页码：1333 / 1343

页数：10

共 47 条

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