盐间页岩油体积压裂技术研究与实践

doi:10.3969/j.issn.1006-6535.2022.02.022

特种油气藏 ›› 2022, Vol. 29 ›› Issue (2): 149-156.DOI: 10.3969/j.issn.1006-6535.2022.02.022

盐间页岩油体积压裂技术研究与实践

刘红磊^1,2, 徐胜强^1,2, 朱碧蔚³, 周林波^1,2, 黄亚杰⁴, 李保林⁴

1.页岩油气富集机理与有效开发国家重点实验室,北京 100101;
2.中国石化石油工程技术研究院,北京 100101;
3.中国石油玉门油田分公司,甘肃酒泉 735000;
4.中国石化江汉油田分公司,湖北武汉 430035

收稿日期:2021-01-18 修回日期:2021-10-11 出版日期:2022-04-25 发布日期:2023-01-10
作者简介:刘红磊(1976—),男,高级工程师,1999年毕业于中国石油大学(华东)石油工程专业,现主要从事低渗透储层改造理论研究与现场技术服务等工作。
基金资助:
中国石化科技攻关项目“盐间页岩油增产工艺及试采技术研究”(P19013-5)

Research and Practice of SRV Fracturing Technology for Inter-salt Shale Oil

Liu Honglei^1,2, Xu Shengqiang^1,2, Zhu Biwei³, Zhou Linbo^1,2, Huang Yajie⁴, Li Baolin⁴

1. State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Beijing 100101, China;
2. Sinopec Research Institute of Petroleum Engineering, Beijing 100101, China;
3. PetroChina Yumen Oilfield Company, Jiuquan, Gansu 735000, China;
4. Sinopec Jianghan Oilfield Company, Wuhan, Hubei 430035, China

Received:2021-01-18 Revised:2021-10-11 Online:2022-04-25 Published:2023-01-10

摘要/Abstract

摘要： 盐间页岩油储层存在上下盐岩蠕变特征不清,压裂过程中易受上下塑性盐岩干扰;储层岩性组分多、敏感性复杂、孔隙连通性差,储层中可溶盐的溶解规律不清楚等特点。储层特点对体积压裂技术提出了较高要求,为寻求盐间页岩油高效开发手段,在潜江凹陷古近系盐间页岩油油藏的BYY1HF井试验采用CO₂增能复合压裂、耐酸压裂液加砂技术、密切割强加砂压裂技术和投球暂堵技术。CO₂增能复合压裂技术具有增加返排能力、改善基质孔渗性、穿透性强、返排率高的优势;耐酸压裂液体系在酸性环境(pH值为2～6)下性能稳定,携砂能力强,对储层伤害低;密切割强加砂压裂技术能克服“簇集效应”,促进各簇裂缝均匀开启及延伸,提高体积压裂效果。施工效果表明,该技术体系具有增强返排能力、改善储层孔渗性、提高岩石起裂能力及裂缝复杂度等优势,一定程度上提升了基质供油能力。该压裂技术试验对盐间页岩油大规模压裂改造具有较好的借鉴意义。

关键词: 盐间页岩油, 耐酸压裂液, CO₂复合体积压裂, 密切割, 暂堵转向, 潜江凹陷

Abstract: The inter-salt shale oil reservoirs are characterized by unclear creep characteristics of the upper and lower salt rocks, susceptibility to interference with the upper and lower plastic rocks during fracturing, multiple lithological components, complex sensitivity, poor pore connectivity, and unclear dissolution pattern of soluble salts. There are more stringent requirements for SRV fracturing due to reservoir characteristics. For efficient development of inter-salt shale oil, Well BYY1HF in Paleogene inter-salt shale oil reservoir, Qianjiang Sag was tested with such technologies as CO₂ enhanced composite fracturing, acid-resistant fracturing fluid plus sanding, dense cutting plus forced-sanding fracturing, and temporary plugging fracturing with ball casting. CO₂ enhanced composite fracturing had the advantages of increased flowback capacity, improved matrix porosity and permeability, strong penetration, and high flowback rate. The acid-resistant fracturing fluid system could maintain stable performance, strong sand carrying capacity and low damage to reservoirs in acidic environment (pH 2-6). The dense cutting plus forced-sanding fracturing technology could eliminate the "agglomeration effect", promote the uniform opening and propagation of each cluster of fractures, and improve the SRV fracturing effect. The construction results showed that the technical system was advantaged by enhancing the flowback capacity, improving the porosity and permeability of the reservoir, promoting the rock capacity of fracturing initiation, fracture complexity, etc., and improving the oil supply capacity of the matrix to a certain extent. The test of fracturing technology is of great significance in reference for the large-scale fracturing transformation of inter-salt shale oil.

Key words: inter-salt shale oil, acid-resistant fracturing fluid, CO₂ complex SRV fracturing, dense cutting, temporary plug steering, Qianjiang Sag

中图分类号:

TE357.2

刘红磊, 徐胜强, 朱碧蔚, 周林波, 黄亚杰, 李保林. 盐间页岩油体积压裂技术研究与实践[J]. 特种油气藏, 2022, 29(2): 149-156.

Liu Honglei, Xu Shengqiang, Zhu Biwei, Zhou Linbo, Huang Yajie, Li Baolin. Research and Practice of SRV Fracturing Technology for Inter-salt Shale Oil[J]. Special Oil & Gas Reservoirs, 2022, 29(2): 149-156.

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盐间页岩油体积压裂技术研究与实践

Research and Practice of SRV Fracturing Technology for Inter-salt Shale Oil

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