压力衰减法在大牛地致密储层流体敏感性评价中的应用  

A New Method to Evaluate Fluid Sensitivity of Tight Reservoir:Pressure Decay Analysis

作　　者：康毅力[1] 张晓磊[1] 游利军[1] 杜新龙[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

出　　处：《钻井液与完井液》2013年第6期81-84,97-98,共4页Drilling Fluid & Completion Fluid

基　　金：国家科技重大专项(2011ZX05018-005-003);973计划课题(2010CB226705)

摘　　要：致密储层具有低孔低渗、孔隙结构复杂、黏土矿物发育等特点,渗透率一般小于0.1×10-3μm2。开发过程中,工作液进入致密气层导致储层损害,严重影响气井的产能。目前国内外尚未形成统一的针对致密储层损害的敏感性评价方法和标准。与常规储层敏感性评价方法相比,压力衰减法不需计量岩心出口端流量,而是以记录流体通过岩心时压力随时间变化的方式来评价岩心渗透性和损害程度,从而解决了致密岩心渗透率过低而引起的实验误差大、流量监测时间长等常规评价问题。以大牛地气田为例,应用压力衰减法评价了该区盒3段储层的水敏、盐敏、碱敏程度,并与行业标准法对比,评价结果一致,表明压力衰减法具有渗透率评价范围广、评价结果精度高、可行性强、易操作等特点。Tight reservoir has been characterized by developed clay minerals,complex pore structure,low porosity and low permeability which is usually less than 0.1×10^(-3) μm^2.Working fluids entering into the tight gas reservoir greatly decreased the productivity.There's no criteria on the sensitivity damage evaluation of tight reservoirs.Compared with the conventional method measuring the outlet flow of core,pressure decay method only record the pressure data varying with time overcoming the problems of experiment error and long time flow monitoring.Pressure decay method was used in Daniudi gas field to evaluate the formation water sensitivity,salt sensitivity and alkali sensitivity of Daniudi Hesan formation.Evaluation results are consistent with the conventional method,which indicate that it has a wide evaluation range,high accuracy and simple operation procedure.

关 键 词：压力衰减法 行业标准法 流体敏感性 致密储层 储层保护 

分 类 号：TE258[石油与天然气工程—油气井工程]