致密砂岩交替注酸压裂工艺技术

发布时间：2018-05-18 22:13

本文选题：致密砂岩 + 体积压裂　；参考：《特种油气藏》2017年05期

【摘要】：为进一步扩大致密砂岩储层压裂有效改造体积,提高多尺度裂缝的复杂程度,结合压裂与酸化技术的优势,开展了交替注酸压裂技术研究。阐述了致密砂岩交替注酸压裂工艺的机理及作用;利用压裂裂缝模拟软件,对交替注酸模式及交替注入参数进行了正交模拟优化;结合储层特性及交替注酸压裂工艺要求,对交替注入段塞中的酸液及顶替液类型进行了优化。研究表明:前置液造缝缝长达到总设计缝长的70%左右时,即可进行多级交替注酸工艺;交替注酸泵注过程中,每级顶替排量以阶梯递增式注入、每级顶替液量按递减式注入、增大顶替液黏度及增加交替注入级数等方式,都有利于提高酸液在裂缝中的波及范围及均匀分布程度。现场试验表明,多级交替注酸压裂工艺压裂后增产及稳产效果显著高于常规改造工艺,可提高致密砂岩油气藏压裂有效性及改造效果。该技术可为致密砂岩储层的有效压裂提供技术支持。
[Abstract]:In order to further expand the volume of fracturing in tight sandstone reservoir and improve the complexity of multi-scale fractures, the alternating acid injection fracturing technology was studied in combination with the advantages of fracturing and acidizing technology. This paper expounds the mechanism and function of alternating acid injection fracturing technology for tight sandstone, optimizes the alternating acid injection mode and parameters by using fracturing fracture simulation software, combines reservoir characteristics and requirements of alternating acid injection fracturing technology. The types of acid and displacement fluid in alternate slug were optimized. The results show that the multi-stage alternating acid injection process can be carried out when the seam length of the front liquid reaches about 70% of the total designed seam length, and the displacement of each step is incrementally injected by step, and the displacement of each step is injected by decreasing mode during the injection process of the alternating acid injection pump. Increasing the viscosity of the displacement fluid and increasing the alternating injection series can improve the sweep range and uniform distribution of the acid in the fracture. The field test shows that the effect of increasing production and stable production after fracturing by multi-stage alternating acid injection fracturing technology is significantly higher than that of conventional transformation technology, and it can improve the fracturing effectiveness and revamping effect of tight sandstone reservoir. This technique can provide technical support for effective fracturing of tight sandstone reservoir.
【作者单位】：页岩油气富集机理与有效开发国家重点实验室;中国石化石油工程技术研究院;中国石油青海油田分公司;
【基金】：国家科技重大专项“复杂地层储层改造关键技术”(2011ZX05031-004-003) 中国石化科技攻关项目“鄂南致密油藏两级裂缝高导流复合压裂技术研究”(P17088)
【分类号】：TE357.2

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