复合压裂增产机理及裂缝扩展规律分析  

Analysis on production increasing mechanism and crack extension law of compound fracturing

作　　者：徐东升[1] 

机构地区：[1]西安石油大学CNPC高能气体压裂研究室,陕西西安710065

出　　处：《石油化工应用》2015年第12期17-19,共3页Petrochemical Industry Application

基　　金：国家自然科学基金项目;项目编号:51274164;中国石油天然气股份有限公司科学研究与技术开发项目;项目编号:2011D-5008-05

摘　　要：针对水力压裂及高能气体压裂在储层改造方面所存在的不足,进行了复合压裂增产技术研究,对复合压裂增产机理及其优势进行了分析,探讨了复合压裂裂缝形态及扩展规律。研究表明:复合压裂可以形成多裂缝、较大缝长的裂缝体系,能大幅提高裂缝导流能力,并可有效破除井壁应力集中现象,适用于破裂压力较高的低渗储层改造;射孔方位角度越大,复合压裂裂缝扩展长度越短;注液排量越大,裂缝转向半径越大;水平地应力比值越大,裂缝转向半径越小。Amid on the shortcomings of hydraulic fracturing and high energy gas fracturing in the reservoir, the research on the technology of compound fracturing stimulation is carried out, and the production increasing mechanism of compound fracturing and its advantages are analyzed, the fracture morphology and extension law of compound fracturing are studied. Research shows that compound fracturing can form many long cracks and greatly improve the fracture conductivity. Additionly, it can also effectively remove welbore stress concentration phenomenon and is suitable for the low permeability reservoir with high fracture pressure.With the perforation azimuth angle increasing, the fracture propagation length shortens. The larger the injection fluid displacement, the greater the curvature radius of the crack.As the horizontal stress ratio increases, the crack radius decreases.

关 键 词：复合压裂 增产机理 射孔方位 裂缝转向曲率半径 扩展规律 

分 类 号：TE357.1[石油与天然气工程—油气田开发工程]