二氧化碳混相压裂吞吐实验

吴俊峰; 刘宝忠; 刘道杰; 王长权; 李迎辉; 刘国华

doi:10.3969/j.issn.1006-6535.2022.05.018

特种油气藏 >

2022 , Vol. 29 >Issue 5: 126 - 131

DOI: https://doi.org/10.3969/j.issn.1006-6535.2022.05.018

油藏工程

二氧化碳混相压裂吞吐实验

吴俊峰 ,
刘宝忠 ,
刘道杰 ,
王长权 ,
李迎辉 ,
刘国华

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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

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。

收稿日期: 2021-12-28

修回日期: 2022-05-05

网络出版日期: 2023-01-10

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)

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Test of CO₂ Miscible Fracturing and Huff and Puff

Wu Junfeng ,
Liu Baozhong ,
Liu Daojie ,
Wang Changquan ,
Li Yinghui ,
Liu Guohua

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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 date: 2021-12-28

Revised date: 2022-05-05

Online published: 2023-01-10

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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

本文引用格式

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 . DOI: 10.3969/j.issn.1006-6535.2022.05.018

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

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