DMF新型超分子暂堵剂研发及性能评价

摘要/Abstract

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。

关键词: 苏里格, 致密, 超分子, 热致凝胶, 暂堵剂

Abstract:

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 plugging 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 viscosity 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 temporary plugging steering than that of conventional plugging agent, demonstrating a more desirable diversion agent for tight-gas reservoirs.

Key words: Sulige, tight reservoir, supermolecule, heat-induced gel, temporary plugging agent

中图分类号:

TE357

徐昆,李达,郭玉杰,范希良,赵立强. DMF新型超分子暂堵剂研发及性能评价[J]. 油气藏评价与开发, 2019, 9(1): 51-55.

Xu Kun,Li Da,Guo Yujie,Fan Xiliang,Zhao Liqiang. Design and property evaluation of a novel supermolecule temporary plugging agent DMF[J]. Reservoir Evaluation and Development, 2019, 9(1): 51-55.

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