曾凡辉,胡大淦,张宇,刘学伟,郭建春,屈易祥,陈安
ZENG Fanhui,HU Dagan,ZHANG Yu,LIU Xuewei,GUO Jianchun,QU Yixiang,CHEN An

• 1:西南石油大学石油与天然气工程学院
• 2:油气藏地质及开发工程国家重点实验室
• 3:中国石油大港油田公司石油工程研究院

摘要(Abstract)：

为提高多尺度暂堵剂封堵效果，提出了一种基于粒度组成调控封堵层渗透率及强度的粒度优化方法。首先将d1/2理论和5/6匹配原则相结合，确定出不同缝宽下暂堵剂稳定堆积的粒度分布基线；然后，在考虑暂堵剂性能参数的基础上，基于Kozeny-Carman模型，通过分形理论建立了封堵层渗透率模型；最后，综合考虑摩擦和剪切失稳准则，建立封堵层强度模型，优化暂堵剂粒度分布和封堵层长度。根据优化设计方法开展室内封堵效果评价，设计了代表粒径为1.14 mm的暂堵剂对缝宽为3 mm的岩心进行封堵。结果表明：在闭合压力为40 MPa的条件下，封堵层的承压能力为33 MPa，渗透率为2.2×10-3μm2，渗透率和封堵强度实验值与建立的理论模型预测值相对误差分别为9.09%和6.06%，表明优化设计方法可靠。现场应用结果显示，加入暂堵剂后，施工压力从88.4 MPa上升到93.2 MPa，微地震表明暂堵剂的加入促使裂缝转向开启，有效提高了裂缝复杂程度并增加了改造体积。研究成果可为暂堵剂粒度参数优化提供理论支撑。
In order to improve the plugging effect of multi-scale temporary plugging agent, a particle size optimizing method is proposed on the basis of particle size composition to adjust and control the permeability and strength of plugging layer. Firstly, d~(1/2) theory and 5/6 matching principle are combined to define particle size distribution baseline of stable accumulation of temporary plugging agent in fractures with different widths. Then according to KozenyCarman model, the permeability model of plugging layer is established by fractal theory, based on consideration of the performance parameters of temporary plugging agent. Finally, comprehensively considering friction and shear instability criteria, plugging layer strength model is established to optimize the particle size distribution of temporary plugging agent and the length of plugging layer. Laboratory evaluation of plugging effect is carried out by using optimization design method, and a temporary plugging agent with representative particle size of 1.14 mm is designed to plug the core with 3 mm fracture width. The results show that, when closure pressure is 40 MPa, plugging layer has pressure-bearing capacity of 33 MPa and permeability of 2.2×10~(-3) μm~2,with relative errors of permeabiliy and plugging intensity being 9.09% and 6.06% respectively compared with predicted values of established theoretical model, and indicating the reliability of the optimization design method. Field application shows that operation pressure increases from 88.4 MPa to 93.2 MPa after injecting temporary plugging agent. Micro-seismic presents increase of stimulation volume, indicating that temporary plugging agent helps fractures reorienting opening and effectively improves fractures complexity. The research provides theoretical support for optimization of particle size parameters of temporary plugging agent.

关键词(KeyWords)： 暂堵剂;粒度分布;封堵层渗透率;封堵层强度;实验验证;现场应用
temporary plugging agent;particle size distribution;plugging layer permeability;plugging layer strength;experimental verification;field application

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金重点项目“四川盆地深层含硫碳酸盐岩气藏立体酸压基础研究”（U21A20105）

作者(Author): 曾凡辉,胡大淦,张宇,刘学伟,郭建春,屈易祥,陈安
ZENG Fanhui,HU Dagan,ZHANG Yu,LIU Xuewei,GUO Jianchun,QU Yixiang,CHEN An

DOI: 10.19597/j.issn.1000-3754.202207013

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