异常高压裂缝性低渗油气藏探测半径计算新方法  

A new method for calculating the detection radius in abnormally high-pressure fractured low-permeability reservoirs

作　　者：石军太 杨博[1,2] 贾焰然 赵力彬 何元元 魏鹏 SHI Juntai;YANG Bo;JIA Yanran;ZHAO Libin;HE Yuanyuan;WEI Peng(State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum,Beijing 102249,China;Coalbed Methane Research Center,China University of Petroleum,Beijing 102249,China;Southwest Tarim Exploration and Development Company,Tarim Oilfield Company,PetroChina,Kashgar 844804,China)

机构地区：[1]中国石油大学(北京)油气资源与探测国家重点实验室,北京102249 [2]中国石油大学(北京)煤层气研究中心,北京102249 [3]中国石油塔里木油田分公司塔西南勘探开发公司,新疆喀什844804

出　　处：《断块油气田》2023年第2期318-324,336,共8页Fault-Block Oil & Gas Field

基　　金：中国石油塔里木油田分公司委托项目“博孜-大北万亿方气区复杂油气藏高效开发配套技术研究及现场应用”(TXN011020120001);中国石油大学(北京)优秀青年学者基金项目“煤层气藏储层物性改造技术及增产机理研究”(2462020QNXZ003)。

摘　　要：异常高压裂缝性低渗油气藏具有岩石孔隙体积压缩系数大且易变化的特点。为了准确计算异常高压裂缝性低渗油气藏的探测半径,利用油气藏压力变化引起的孔隙体积压缩系数、孔隙度和渗透率变化的机理,建立了孔隙体积压缩系数、孔隙度和渗透率计算模型,提出了适合异常高压裂缝性低渗油气藏的探测半径计算新方法。研究发现:对于异常高压裂缝性低渗油气藏,孔隙体积压缩系数在生产过程中随着孔隙压力降低先快速降低,后逐渐平缓。在计算探测半径时,孔隙体积压缩系数、孔隙度和渗透率三者的变化机理均不可忽略,通常会考虑孔隙度和渗透率的应力敏感效应,但如果忽略孔隙体积压缩系数的变化,会严重低估此类油气藏压力传播距离,且产量越大,低估程度越大。研究成果对异常高压裂缝性低渗油气藏试井设计和合理井距确定具有指导意义。Abnormally high-pressure fractured low-permeability reservoirs have the characteristics of large rock pore volume compressibility and easy to change.In order to accurately calculate the detection radius in abnormally high-pressure fractured low-permeability oil and gas reservoirs,based on the mechanism of the change of pore volume compressibility,porosity and permeability caused by the change in oil and gas reservoir pressure,the calculation model of pore volume compressibility,porosity and permeability is established,and a new calculation method for calculating the detection radius suitable for abnormally high-pressure fractured low-permeability oil and gas reservoirs is proposed.It is found that for abnormally high-pressure fractured low-permeability oil and gas reservoirs,the pore volume compressibility first decreases rapidly and then gradually flattens with the decrease of pore pressure in the production process.When calculating the detection radius,the change mechanism of pore volume compressibility,porosity and permeability cannot be all ignored.The stress sensitive effect of porosity and permeability is usually considered.However,if the change of pore volume compressibility is ignored,the pressure propagation distance of such oil and gas reservoirs will be seriously underestimated,and the greater the production,the greater the degree of underestimate.The research results have guiding significance for well test design and reasonable well spacing determination in abnormally high-pressure fractured low-permeability oil and gas reservoirs.

关 键 词：孔隙体积压缩系数 探测半径 应力敏感 裂缝性低渗透 

分 类 号：TE348[石油与天然气工程—油气田开发工程]