压裂输砂与返排一体化物理模拟实验研究  

Integrated Physical Modeling Experiment Research on Sand Transport and Backflow in Fracturing

作　　者：吴春方 刘建坤[1,2] 蒋廷学 吴峙颖[1,2] 侯磊 Wu Chunfang;Liu Jiankun;Jiang Tingxue;Wu Zhiying;Hou Lei(State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Beijing 100101, China;Sinopec Research Institute of Petroleum Engineering, Beijing 100101, China)

机构地区：[1]页岩油气富集机理与有效开发国家重点实验室,北京100101 [2]中国石化石油工程技术研究院,北京100101

出　　处：《特种油气藏》2019年第1期141-146,共6页Special Oil & Gas Reservoirs

基　　金：国家科技重大专项"海相碳酸盐岩超深油气井关键工程技术"(2017ZX05005-005);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"(P17005-5)

摘　　要：为了研究压裂和返排过程中支撑剂在裂缝中的运移、沉降和回流规律,自主研制了"YF-1"型压裂输砂和返排一体化模拟实验装置,在模拟储层温度、闭合应力和滤失情况下,开展了不同裂缝宽度、压裂液黏度、支撑剂类型、排量和出砂临界流速等因素在输砂和返排过程中对砂堤剖面的影响实验。实验结果表明:输砂和返排过程中,液体黏度是影响砂堤剖面的最主要因素,其次是支撑剂粒径和排量,裂缝宽度对砂堤剖面的影响最小;在返排过程中,液体黏度越小,出砂临界流速越大;缝宽和支撑剂粒径越大,出砂临界流速越大,在压裂后放喷时,应保证压裂液完全破胶,避免出砂。研究结果为压裂液优选、压裂施工参数优化、支撑剂优选及压裂后返排制度的制订提供了依据。In order to study the migration, sedimentation and reflux regularity of proppant in fracture during fracturing and backflow, a "YF-1" integrated modeling experiment device for sand transport and backflow in fracturing was developed independently. In the case of simulating the reservoir temperature, closure stress and fluid loss, the experiment of effect of different fracture widths, fracturing fluid viscosities, proppants, displacements and sanding critical flow velocities on the sand bank profile during sand transport and backflow was carried out. The experimental results show that in the course of sand transport and backflow, the liquid viscosity is the most important factor affecting the sand bank profile, followed by the proppant size and displacement, and the influence of fracture width on the sand bank profile is the least;in the course of backflow, the lower the liquid viscocity, the greater the sanding critical flow velocity;the larger the fracture width and proppant size, the greater the sanding critical flow velocity;and at the time of blow off after fracturing, the fracturing fluid should be ensured complete gelout to avoid sand production. The study results provide the basis for the optimal selection of fracturing fluid, the optimization of fracturing operation parameters, the optimal selection of proppant and the formulation of the post-frac backflow system.

关 键 词：压裂输砂 返排 砂堤剖面 出砂临界流速 模拟实验装置 

分 类 号：TE357.1[石油与天然气工程—油气田开发工程]