支撑剂在裂缝中的运移规律及铺置特征

Migration law and placement characteristics of proppant in fractures

狄伟

DI Wei

中国石化华北油气分公司石油工程技术研究院，河南 郑州 450006

Research Institute of Engineering Technology, North China Oil & Gas Company, SINOPEC, Zhengzhou 450006, China

针对高闭合应力储层加砂压裂难度大的问题，文中以提高支撑剂在裂缝中的铺置效率和导流能力为目的，利用数值模拟的方法分析了影响支撑剂运移的主要因素，并采用物理模拟实验对数值模型进行校正，进而明确支撑剂在裂缝中的运移规律和铺置特征。结果表明：采用低密度、小粒径支撑剂和高排量、低砂比以及高黏度压裂液体系可以有效降低缝内砂堤平衡高度，延长支撑剂的铺置距离，减少缝内砂堵。依据运移规律及铺置特征分析结果，应用压裂模拟软件对定北区块压裂设计参数进行优化。通过现场应用，施工成功率由75.0%提高至97.8%，产量也取得突破，获得了较好的应用效果。

Aiming at the difficulty of fracturing in high closed stress reservoirs, in order to improve the placement efficiency and conductivity of proppant in fractures, this paper analyzes the influencing factors that affect proppant migration by numerical simulation, and uses the physical experiment to correct the digital model, and then clarifies the migration law and placement characteristics of proppant in fractures. The results show that the low density and small size proppant, high displacement, low sand ratio and high viscosity fracturing fluid can effectively reduce the balance height of the sand dam, prolong the placement distance of proppant, and reduce the sand plugging in fractures. According to the analysis results, the fracturing design parameters of the Dingbei Block were optimized by fracturing simulation software. Through field application, the construction success rate has increased from 75.0% to 97.8%, and the output has also made breakthroughs, and a good application effect has been obtained.

10.6056/dkyqt201903018