异常高压有水气藏水侵规律新认识  

New Understanding of Water Invasion Rules of Aquifer Gas Reservoirs with Over-pressure

作　　者：刘道杰[1] 刘志斌[1] 田中敬[1] 郑琴[1] 邓晓梅[2] 

机构地区：[1]西南石油大学研究生部,四川成都610500 [2]中石油华北油田分公司第三采油厂,河北河间062450

出　　处：《石油天然气学报》2011年第4期129-132,119,共4页Journal of Oil and Gas Technology

基　　金：国家自然科学基金项目(50874094);高等学校博士学科点专项科研基金项目(20095121110003)

摘　　要：异常高压有水气藏水侵不仅降低了气井产能和缩短了气井寿命,而且降低了气藏采出程度和最终采收率。研究异常高压有水气藏水侵规律能够解决一般笼统认识气藏水侵类型及水侵原因的弊端。在异常高压气藏储层敏感性评价的基础上,通过分析储层岩石微观变形过程,研究了异常高压有水气藏水侵顺序及水侵微观机理:裂缝性异常高压气藏开发初期水侵主要为裂隙水,开发中后期主要为封存水、间隙水及少量裂隙水;无裂缝异常高压气藏低水气比生产期水侵主要为凝析水,高水气比生产期主要为封存水、间隙水或边水、底水(若气藏含有边、底水)。通过实例验证了异常高压有水气藏水侵顺序及水侵微观机理的正确性。最后,针对异常高压有水气藏不同水侵特点提出了不同的开发对策。异常高压有水气藏水侵规律新认识能够为认清气井出水机理、控制气藏水侵、调整气井采气工艺措施、优化气藏开发模式、增长气藏开发寿命等提供重要依据。The water invasion of over-pressured aquifer gas reservoir reduced gas well deliverability and shortened gas well life.Besides,the water invasion also reduced recovery percentage of OGIP and ultimate recovery.The research for water invasion rules of over-pressured aquifer gas reservoirs could overcome the mistakes that water invasion types and water invasion source were generally realized in tradition.Based on the formation sensitivity evaluation for over-pressured aquifer gas reservoirs,the water invasion order and microscopic mechanism of water invasion were studied by analyzing the micro deformation process of reservoir rock.At the initial stage,water invasion was mainly crevice water and at the middle and late stages it was connate water,interstitial water and a little crevice water.In over-pressured gas reservoirs without fractures,in the low water-gas ratio production period water invasion was mainly condensation water and in high low water-gas ratio production period it was connate water,interstitial water,edge water(if any) and bottom water(if any).Then,the water invasion order and microscopic mechanism of water invasion are proved to be correct by case study.Eventually,several kinds of development strategies are put forward for each kind of water invasion feature.The new understanding of water invasion rules and development strategies for over-pressured aquifer gas reservoirs provide an important basis for recognizing water-producing mechanism,water invasion control,measures for adjusting production gas,development mode optimization and prolonging development life.

关 键 词：异常高压有水气藏 水侵 微观机理 水气比 裂缝 开发对策 

分 类 号：P618.13[天文地球—矿床学]