元坝隔层型底水气藏水侵动态实验模拟研究  

Experimental simulation study on water invasion dynamics of Yuanba interlayer type bottom water gas reservoir

作　　者：祝浪涛 黄仕林 吴亚军 张明迪[1] 史晨辉 ZHU Lang-tao;HUANG Shi-lin;WU Ya-jun;ZHANG Ming-di;SHI Chen-hui(Exploration and Production Research Institute,Southwest Oil and Gas Company of SINOPEC,Chengdu 610041,China;Petroleum Engineering School,Southwest Petroleum University,Chengdu 610500,China)

机构地区：[1]中石化西南油气分公司勘探开发研究院,四川成都610041 [2]西南石油大学石油与天然气工程学院,四川成都610500

出　　处：《陕西科技大学学报》2024年第4期101-110,共10页Journal of Shaanxi University of Science & Technology

基　　金：国家自然科学基金项目(52074236);中国石化科技攻关计划项目(P13056)。

摘　　要：元坝长兴组生物礁储层纵向发育多期生物礁,不同期次礁体之间均发育不同程度的不渗透隔层、低渗透隔层,纵横向展布连续性差,隔层如何影响底水水侵动态是气藏开发关注的重点和难点.本文首次设计了7组无隔层、低渗透隔层、不渗透隔层型底水水侵全直径岩心物理模拟实验:主要包括无隔层型、不渗透隔层型和低渗透隔型底水水侵模拟对比实验,不渗透隔层型底水在不同衰竭速度下的水侵动态模拟实验,不同厚度低渗透隔层水侵动态模拟实验.实验结果表明,隔层型底水气藏水侵可划分为以天然气弹性能为主要驱动能的弹性气驱、受天然气弹性能与底水水体补能共同作用的水体补能及受水侵储层伤害控制的气水同产三类渗流阶段,隔层、低采速、高厚度隔层能够抑制底水过快水侵到井底,提高气藏开发效果.基于无隔层、有隔层型底水水侵渗流阶段的差异性建立了水侵模式诊断曲线,为明确底水气藏模式提供了理论支撑.Changxing Formation reef reservoir in Yuanba has vertically developed multiple stages of reef,with varying degrees of impermeable and low-permeability barriers between different stages of reef bodies.The continuity of vertical and horizontal distribution is poor,and how the barriers affect the bottom water invasion performance is a key and difficult issue in gas reservoir development.This article is the first to design 7 sets of physical simulation experiments for full diameter core water invasion of non barrier,low permeability barrier,and non permeable barrier types of bottom water:mainly including comparative experiments for non barrier,non permeable barrier,and low permeability barrier types of bottom water invasion simulation,dynamic simulation experiments for water invasion of non barrier type bottom water at different depletion rates,and dynamic simulation experiments for water invasion of low permeability barrier layers with different thicknesses.The experimental results show that the water invasion of the interlayer type bottom water gas reservoir can be divided into three permeability stages:elastic gas drive driven mainly by natural gas elastic energy,water replenishment affected by the combined effect of natural gas elastic performance and bottom water invasion replenishment,and gas water co production controlled by water invasion reservoir damage.The interlayer,low production rate,and high thickness of the interlayer can suppress the rapid water invasion of the bottom water to the well bottom and improve the development effect of the gas reservoir.A diagnostic curve for water invasion mode was established based on the differences in the seepage stages of bottom water invasion with and without compartments,providing theoretical support for clarifying the mode of bottom water gas reservoirs.

关 键 词：底水 不渗透隔层 低渗透隔层 隔层厚度 衰竭速度 

分 类 号：TE332[石油与天然气工程—油气田开发工程]