二氧化碳混相压裂吞吐实验

doi:10.3969/j.issn.1006-6535.2022.05.018

特种油气藏 ›› 2022, Vol. 29 ›› Issue (5): 126-131.DOI: 10.3969/j.issn.1006-6535.2022.05.018

二氧化碳混相压裂吞吐实验

吴俊峰¹, 刘宝忠¹, 刘道杰¹, 王长权², 李迎辉¹, 刘国华³

1.中国石油冀东油田分公司,河北唐山 063004;
2.长江大学,湖北武汉 430100;
3.中国石油长城钻探工程有限公司,辽宁盘锦 124010

收稿日期:2021-12-28 修回日期:2022-05-05 发布日期:2023-01-10
通讯作者: 刘道杰(1981—),男,高级工程师,2006年毕业于中国石油大学(华东)石油工程专业,2012年毕业于西南石油大学石油工程计算技术专业,获博士学位,现从事油藏储层改造及提高采收率研究工作。
作者简介:吴俊峰(1979—),男,工程师,2004年毕业于西南石油大学石油工程专业,现从事油气藏开发工程及管理工作。
基金资助:
国家科技重大专项“低渗-致密砂岩储层体系表征及评价新方法”(2017ZX05009001-002);国家自然科学基金“超临界CO₂-原油-地层水三相相平衡溶解度规律”(51404037)

Test of CO₂ Miscible Fracturing and Huff and Puff

Wu Junfeng¹, Liu Baozhong¹, Liu Daojie¹, Wang Changquan², Li Yinghui¹, Liu Guohua³

1. PetroChina Jidong Oilfield Company, Tangshan, Hebei 063004, China;
2. Yangtze University, Wuhan, Hubei 430100, China;
3. CNPC Great Wall Drilling Company, Panjin, Liaoning 124010, China

Received:2021-12-28 Revised:2022-05-05 Published:2023-01-10

摘要/Abstract

摘要： 针对南堡凹陷高5断块V油组常规水力压裂开发效果不佳的问题,通过开展PVT和岩心混相吞吐实验,明确CO₂混相压裂吞吐提高采收率作用机理,并利用矿场试验进一步验证技术有效性。研究结果表明:在目前地层压力(33.00 MPa)下,CO₂与原油可实现混相,且注入摩尔分数为60%的CO₂后原油体积膨胀41.01%,黏度降低33.08%,密度增加7.28%,表明CO₂对原油具有较好的增溶、膨胀、降黏作用;CO₂混相压裂吞吐采出程度可达到60%以上。试验井CO₂混相压裂吞吐后稳定生产26个月,累计增油2 200 t,原油重质组分得到了有效动用。该研究为低渗及致密油藏效益开发提供了有效技术途径。

关键词: 低渗透油藏, CO₂混相压裂吞吐, 提高采收率, 最小混相压力, 南堡凹陷

Abstract: To address the problem of poor development of conventional hydraulic fracturing in V Formation of Fault Block Gao 5, Nanpu Sag, PVT and core miscible huff and puff tests were conducted to clarify the mechanism of enhancing oil recovery by CO₂ miscible fracturing and huff and puff, and the technical effectiveness was further verified by field tests. The study results showed that: at the current formation pressure (33.00 MPa), CO₂ and crude oil could be mixed, and the crude oil volume was expanded by 41.01%, the viscosity decreased by 33.08%, and the density increased by 7.28% after the injection of CO₂ with a mole fraction of 60%, and CO₂ was effective in solubilization, expansion and viscosity reduction of crude oil; the recovery efficiency could reach more than 60% by miscible fracturing and huff and puff. After CO₂ miscible fracturing and huff and puff, the production of test wells was stable for 26 months, with a cumulative increase of 2 200 t in oil production, and the heavy components of crude oil were effectively utilized. The study provides an effective technical approach for the profitable development of low-permeability tight reservoirs.

Key words: low-permeability reservoir, CO₂ huff and puff in miscible fracturing, enhanced oil recovery, minimum miscible pressure, Nanpu Sag

中图分类号:

TE357.28

吴俊峰, 刘宝忠, 刘道杰, 王长权, 李迎辉, 刘国华. 二氧化碳混相压裂吞吐实验[J]. 特种油气藏, 2022, 29(5): 126-131.

Wu Junfeng, Liu Baozhong, Liu Daojie, Wang Changquan, Li Yinghui, Liu Guohua. Test of CO₂ Miscible Fracturing and Huff and Puff[J]. Special Oil & Gas Reservoirs, 2022, 29(5): 126-131.

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二氧化碳混相压裂吞吐实验

Test of CO₂ Miscible Fracturing and Huff and Puff

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二氧化碳混相压裂吞吐实验

Test of CO2 Miscible Fracturing and Huff and Puff

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Test of CO₂ Miscible Fracturing and Huff and Puff