低渗油藏水平裂缝井增产规律研究  

Study on the Production-increasing Law of the Horizontally fractured Wells in Low-permeability Reservoirs

作　　者：熊健[1] 王绍平 郭平[1] 

机构地区：[1]油气藏地质及开发工程国家重点实验室西南石油大学,四川成都610500 [2]中油长庆油田分公司,甘肃庆阳745100

出　　处：《特种油气藏》2012年第6期101-103,111,共4页Special Oil & Gas Reservoirs

基　　金：国家重大科技项目"深水扇储层气田产能和开发指标预测研究"(2008ZX005056-02-02-03);西南石油大学研究生创新基金"非线性渗流下低渗气藏产能特征研究"(GIFSS0701)

摘　　要：针对低渗油藏压裂开采特征,基于稳定流理论,利用等值渗流阻力法,考虑了启动压力梯度和地层污染等因素的影响,推导出了低渗油藏有限导流水平裂缝井的增产率预测模型,并在此基础上研究和分析了各因素对增产规律的影响。研究结果表明:启动压力梯度对油井压裂后增产率影响较大;在一定裂缝导流能力下,裂缝长度越长,对油井压裂后增产率的影响越强;在一定裂缝长度下,存在1个最佳裂缝导流能力;在裂缝参数中,增加裂缝长度比增加裂缝导流能力更重要,且更易实现;污染半径不同,压裂增产措施改善程度差别较大。In view of the production characteristics of low permeability reservoirs which are subjected to fracturing and steady state flow theory,a prediction model of production increase percentage of a well in a low permeability reservoir with horizontal fractures of finite conductivity is derived and based on this the effect of all factors on production increase law by using the method of iso-resistivity of permeable flow and considering the effect of start-up pressure gradient and formation damage,etc.is studied and analyzed.The study show that start-up pressure gradient has much influence on production increase percentage;under a given fracture,the longer the fracture length,the greater the effect on production increase percentage after fracturing is;under a given fracture length,there exists a optimal fracture conductivity;in the fracture parameters,the increase in fracture length is even more important than the increase in fracture conductivity;formation damage radius has relatively large effect on fracturing effectiveness.

关 键 词：低渗油藏 水平裂缝 启动压力梯度 裂缝参数 渗流阻力法 数值模拟 

分 类 号：TE319[石油与天然气工程—油气田开发工程] TE348