考虑放喷及压裂液压缩性时的压降分析模型  

A MODEL FOR PRESSURE DECLINE ANALYSIS UNDER THE CONDITION OF CONSIDERING BACK FLOW AND COMPRESSIBILITY OF FRACTURING FLUIDS

作　　者：郭建春[1] 王兴文[1] 赵金洲[1] 李怀文 

机构地区：[1]"油气藏地质及开发工程"国家重点实验室.西南石油学院 [2]大港石油集团钻采中心

出　　处：《钻采工艺》2004年第5期24-26,30,共4页Drilling & Production Technology

基　　金：四川省高校"天然气开采重点实验室"项目资助

摘　　要：以物质平衡原理和裂缝延伸规律为基础,在考虑压裂后立即放喷和压裂液的压缩性的情况下,建立了裂缝强制闭合时的二维压降分析模型。该模型不但适用于压裂后立即放喷对裂缝参数解释的影响,也适用于停泵后裂缝继续延伸的情况,而且还可用于裂缝自然闭合的情况。根据该模型编制的软件模拟结果表明,当裂缝进行强制闭合时,以往模型解释的滤失系数比实际值偏大,而该模型可获得真实的滤失系数及其他裂缝参数。A model for pressure decline analysis under the condition of considering back flow and compressibility of fracturing fluids was developed on the basis of material balance theory and the rule of fracture propagation.The model considers the effects of back flow of fracturing fluids just at the moment of shut-in on the fracture parameter interpretation and the continue propagation of fractures after pump off.Furthermore,the model is also suitable for the condition of natural fracture closure.The calculation results obtained from the software come from the model indicate that the value of leak off coefficient obtained from the former models is higher than the real value when the forced fracture closure technique is conducted just at the moment of shut-in ,while the new model can provide a true value of leak off coefficient and other fracture parameters.

关 键 词：压裂液 压缩性 压降分析技术 水力压裂 渗透率 粘度 滤失系数 压缩系数 

分 类 号：TE357.11[石油与天然气工程—油气田开发工程]