缝洞型碳酸盐岩底水气藏水侵规律预测新方法  

A new method for predicting water-invasion laws in fractured-vuggy carbonate gas reservoirs with bottom water

作　　者：邓惠[1,2] 杨胜来 刘义成 樊怀才[4] 张岩 王娟[1] 林怡[1] 申艳 DENG Hui;YANG Shenglai;LIU Yicheng;FAN Huaicai;ZHANG Yan;WANG Juan;LIN Yi;SHEN Yan(Exploration and Development Research Institute,PetroChina Southwest Oil&Gasfield Company,Chengdu,Sichuan 610041,China;Sichuan Petroleum Administration Bureau Company Limited,Chengdu,Sichuan 610051,China;State Key Laboratory of Petroleum Resource and Prospecting,China University of Petroleum(Beijing),Beijing 102249,China;Shale Gas Research Institute,PetroChina Southwest Oil&Gasfield Company,Chengdu,Sichuan 610051,China)

机构地区：[1]中国石油西南油气田公司勘探开发研究院 [2]四川石油管理局有限公司 [3]中国石油大学(北京)油气资源与探测国家重点实验室 [4]中国石油西南油气田公司页岩气研究院

出　　处：《天然气勘探与开发》2023年第2期37-43,共7页Natural Gas Exploration and Development

基　　金：四川省自然科学基金项目“超高压特低孔强非均质碳酸盐岩气藏有效储层物性下限研究”(编号:2023NSFSC0261);中国石油西南油气田公司科技项目“川中地区栖霞组超高压气藏高产井模式研究及稳产能力评价”(编号:20220303-07)。

摘　　要：国内缝洞型碳酸盐岩底水气藏资源潜力巨大,但该类气藏储层的孔隙、溶洞、裂缝普遍发育,非均质性强且气水关系复杂,开采过程中底水容易沿高渗透率缝洞区窜流,导致气井产出地层水,大幅降低气井产能及气藏采收率。因此,正确认识气藏水侵规律是该类气藏高效开发的关键。为此,以四川盆地中部地区缝洞型碳酸盐岩底水气藏为例,针对气藏储层非均质性强的特点,将其抽象为不同渗透率分布的复合储层模型,进而基于稳态渗流理论,建立了一种计算缝洞型底水气藏的气井临界产量、水侵速度和底水突破时间的新方法,应用于典型气井,并利用数值模拟技术验证了该预测方法的可靠性。研究结果表明:(1)气井临界产量随射孔段储层厚度的增加呈先增大后减小的变化规律,且存在一个最优值;(2)底水优先突破位置受生产压差和高渗带分布位置双重作用影响;(3)为延缓气井见水时间、提高气藏采收率,气井配产应不高于临界产量。该研究成果可为缝洞型碳酸盐岩底水气藏水侵动态分析以及整体治水提供技术支撑。ed into a model of composite reservoirs with various ranges in permeability.Then,based on the steady-state flow theory,a novel method for calculating the critical production,water-invasion rate and breakthrough time of bottom water was built for this sorts of reservoirs.It has been applied to typical wells and verified by numerical simulation.Results show that(i)the critical production exhibits a variation of first increase and then decrease with the increase of reservoir thickness at perforated intervals,corresponding to an optimal value;(ii)one location where bottom water breaks through preferentially is sensitive to dual effects of both producing pressure difference and a site of high-permeability zones;and(iii)allocation should not be higher than the critical production so as to delay the water breakthrough and improve the recovery efficiency for gas wells.All research results provide a technical support for dynamic analysis on water invasion and overall water control in the fractured-vuggy carbonate gas reservoirs with bottom water.

关 键 词：缝洞型气藏 底水 临界产量 射孔厚度 见水时间 

分 类 号：TE37[石油与天然气工程—油气田开发工程]