高渗砂岩油藏钻完井一体化储层保护技术

doi:10.11885/j.issn.1674-5086.2021.12.06.03

摘要/Abstract

摘要： 赵东油田作为渤海湾极浅海地区高孔高渗砂岩油藏的代表，面临成岩程度低，胶结疏松，储层中等偏强水敏、中等偏弱速敏损害，易受外来固相侵入损害的难题。为最大限度发挥储层潜力，降低储层损坏，实现油层保护，基于一体化理念，通过室内回收岩屑实验及岩芯渗透率恢复实验，对KCl聚合物水基钻井液体系和无固相水基FLO-PRO储层钻开液体系进行测试，发现前者的页岩膨胀降低率为81.40%、岩芯渗透率恢复率最高为88.21%，后者可使储层渗透率恢复率达100.00%；在现场实践中，固井作业运用低密低温超早高强水泥浆体系；完井作业前物理和化学方法相结合对井眼进行清洗；完井作业期间使用经过两级过滤的清洁KCl盐水作为完井液。运用一体化储层保护技术，有效降低了钻完井作业各环节外来固相对储层的损害，实现了全过程储层保护的最大化，确保了安全高效建井，降低了复杂事故和非生产时间，并实现了油田不同含水阶段的持续有效益开发，形成了该类油藏一体化储层保护技术思路，为同类油藏储层保护提供了可借鉴经验。

关键词: 油气储层保护, 一体化, 屏蔽暂堵, 自破胶, 两级过滤

Abstract: As a representative of high-porosity and high-permeability sandstone reservoirs in the extremely shallow sea area of Bohai Bay, Zhaodong Oilfield is faced with the problems of low degree of diagenesis, loose cementation, medium to strong water sensitivity, medium to weak velocity sensitive damage, and is easy to be damage by external solid invasion. In order to maximize the potential of the reservoir, reduce the damage of the reservoir and realize the protection of the reservoir, based on the concept of integration, the KCl polymer water-based drilling fluid system and the non-solid water-based FLO–PRO reservoir drilling fluid system were tested through the indoor recovery of cuttings and core permeability recovery experiments, and it was found that the former could reduce the shale expansion rate by 81.40% and the core permeability by 88.21%, and the latter could restore the reservoir permeability to 100.00%. In practice, the cementing operation uses a low-density, low-temperature, ultraearly, and high-strength cement slurry system. Before the completion operation, the borehole was cleaned by a combination of physical and chemical methods; Clean KCl brine that has undergone two stages of filtration is used as the completion fluid during completion operations. The integrated reservoir protection technology effectively reduces the damage of external solids to the reservoir in all aspects of drilling and completion operations, maximizes the reservoir protection in the whole process, ensures safe and efficient well construction, reduces complex accidents and non-production time, and realizes the sustainable and profitable development of different water-cut stages of the oilfield..

Key words: pay zone protection, integrity, screening temporary plugs, gel-breaking, two-stage filtration

中图分类号:

TE258

赵平起, 王贺强, 郭海涛, 马翠岩, 王子毓. 高渗砂岩油藏钻完井一体化储层保护技术[J]. 西南石油大学学报(自然科学版), 2023, 45(6): 104-112.

ZHAO Pingqi, WANG Heqiang, GUO Haitao, MA Cuiyan, WANG Ziyu. Integrated Pay Zone Protection Technologies in High-porosity & High-permeability Reservoirs of Bohai Bay[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2023, 45(6): 104-112.

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http://journal15.magtechjournal.com/Jwk_xnzk/CN/Y2023/V45/I6/104

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