长庆低渗透油田重复压裂技术研究  

STUDY OF REFRACTURING TECHNOLOGY IN CHANGQING LOW PERMEABILITY OIL RESERVOIR

作　　者：姜必武[1] 黄远[2] 周会清 

机构地区：[1]北京大学地球与空间科学学院 [2]中国石油长庆油田采油一厂 [3]青海油田采油二厂跃进二号采油作业区

出　　处：《钻采工艺》2009年第3期63-64,127,共2页Drilling & Production Technology

摘　　要：从理论研究了低渗透油藏重复压裂的造缝机理,通过模拟实验分析了长庆低渗透油藏重复压裂的造缝现象,研究结果表明:产层经初次水力压裂后,近缝地层孔隙压力变化和支撑裂缝产生的诱导应力场将改变原始地应力场,从而导致重复压裂改向;重复压裂裂缝的启裂会改向,但其延伸扩展方向依然取决于地应力状态。通过重复压裂的理论计算及模拟试验,可为合理改造低渗油藏提供科学依据。Fracture opening mechanism was theoretically analyzed,physical simulation test was also conducted to study refracturing phenomenon with Changqing core with achievement that after a pay zone's primary fracturing,original terrestrial stress field would change by the induced stress field caused by the change of pore pressure around fractures and propped fractures,so that new fractures by refracturing would reorient from old artificial fractures,which will penetrate into non-draining area to enhance oil production from those wells unsuccessfully fractured.New fractures generated during refracturing would reorient but the extension direction was still the function of stress status.This paper introduced theoretic calculation and simulation test for new fracture generation during refracturing so as to further stimulate pay zone and serve as a scientific reference for low-permeable oilfields.

关 键 词：重复压裂 造缝机理 模拟试验 诱导应力场 

分 类 号：TE357[石油与天然气工程—油气田开发工程]