摘要
苏里格气田属于典型的致密油气藏,曾引用"重复压裂+体积压裂"堵老缝、造多级裂缝网络的理念进行压裂改造,但由于储层致密,常规暂堵剂难以有效进入裂缝进行封堵转向,无法达到预期效果。基于超分子热致凝胶机理,设计出了一种新型超分子热致凝胶暂堵剂DMF,并对其成胶、破胶、转向性能进行了测试。研究表明,新型暂堵剂DMF为受温度激发的热致凝胶体系,在低常温下为低黏度的液体,便于注入;受高温激发,在100～110℃迅速成胶,封堵裂缝,实现转向;持续升温后,自动破胶,实现解堵;其动态封堵能力为122.92 MPa/m,相比常规暂堵剂具有更好的封堵性能,是一种适合致密油气藏暂堵的理想转向剂。
Sulige gas field is a typical tight-gas reservoir whose ultralow permeability comes to a problem to a noble stimulation technology with its name refracturing coupling with SRV fracturing, owing to the failure of injection by conventional plugging agent, which aims to plug existing fractures and create more multistage fractures. So we designed the novel supermolecule temporary plug-ging agent--DMF and conducted a series of tests including gelling, break gelling, and temporary plugging steering. The results had demonstrated that the new plugging agent DMF was responded to high temperature, about 100 ~ 110℃, transforming into high vis-cosity supramolecular gel from low viscosity liquid at low or normal temperature, plugging existing fractures. When the temperature got higher, the gel of DMF turned into liquid automatically. Then, the DMF showed a better performance(122.92 MPa/m)of tempo-rary plugging steering than that of conventional plugging agent, demonstrating a more desirable diversion agent for tight-gas reser-voirs.
作者
徐昆
李达
郭玉杰
范希良
赵立强
Xu Kun;Li Da;Guo Yujie;Fan Xiliang;Zhao Liqiang(State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China;Oil and Gas Technology Research Institute of Changqing Oilfield, Xi 'an, Shaanxi 710018, China;State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Xi 'an Shaanxi 710018, China;NO.5 Gas Production Plant of Changqing Oilfield, CNPC, Ordos, Inner Mongolia 017300, China)
出处
《油气藏评价与开发》
CSCD
2019年第1期51-55,共5页
Petroleum Reservoir Evaluation and Development
基金
中国石油长庆油田公司项目"转向暂堵压裂液体系研究"(CQYT-SLGYJZX-2015-JS-1953)
关键词
苏里格
致密
超分子
热致凝胶
暂堵剂
Sulige
tight reservoir
supermolecule
heat-induced gel
temporary plugging agent
