对应力敏感的缝洞型岩石压缩系数的探讨  

CALCULATION EQUATION OF FRACTURED-VUGGY ROCK COMPRESSIBILITY CONSIDERING STRESS SENSITIVITY

作　　者：杨春[1] YANG Chun(Fengcheng Oilfield Operation Area of PetroChina Xinjiang Oilfield Branch,Karamay,Xinjiang 834000,China)

机构地区：[1]中国石油新疆油田分公司风城油田作业区

出　　处：《钻采工艺》2020年第6期41-43,58,I0003,共5页Drilling & Production Technology

摘　　要：现有岩石压缩系数计算方法大多针对孔隙型岩石,对于三重孔隙介质储层岩石,由于裂缝和洞穴的存在,岩石压缩系数计算复杂,大都采取实验方法测定。为此,基于气体不稳定渗流理论,推导考虑应力敏感的缝洞型岩石压缩系数计算公式,利用气测渗透率计算缝洞型岩石压缩系数。该公式同时适用于单一孔隙介质、双重孔隙介质和三重孔隙介质岩石。实例分析表明,岩石孔隙压缩系数、骨架压缩系数和整体压缩系数都随岩石孔隙内压力的降低而减小,且开始时减小速度较快,到一定程度后减小缓慢。Existing methods of calculation of rock compressibility are mostly for porosity type of rock,for triple-porosity reservoir rock,the rock compressibility is usually determined by experimental measurement because the being of fractures and caves makes calculation process more complicated.Therefore,based on the gas unsteady filtration theory,this article derived the equation of fractured-vuggy rock compressibility factor with the consideration of stress sensitivity.The new equation could calculate fractured-vuggy rock compressibility factor by using gasometry permeability.And it simultaneously applied to calculation of rock compressibility factor of single porous medium and double porosity media and triple-porosity media rock.The example analysis showed that pore compressibility factor,rock frame compressibility factor and entire compressibility factor were reduced with the decrease in pore pressure,moreover,the reduce speed was faster at the beginning,while when the pressure was reduced to a certain extent,the compression coefficient decreases speed became slow.

关 键 词：岩石压缩系数 缝洞型 应力敏感 渗透率 

分 类 号：TE311[石油与天然气工程—油气田开发工程]