摘要
虽然2000年以来我国的天然气产量排在世界前列,但目前我国的天然气产量却远远不能满足国民经济发展的需要,越来越多的气田已进入开发中后期,且绝大部分气藏属低渗透和水驱气藏,采收率低,如何提高气藏采收率已成为当前亟待解决的问题。关于油藏提高采收率的定义、剩余油描述方法与提高原油采收率(EOR)配套技术已较为成熟,但对气藏提高采收率(EGR)的定义与描述还未建立起来,对气藏剩余气分布规律的描述方法与EGR技术还不清楚。为此,在调研大量文献的基础上,对EGR进行了定义,提出按剩余气丰度的方法来进行剩余气分布的描述,分析了国内外已开发的3种主要类型气藏(低渗透气藏、凝析气藏、边底水气藏)的地质开发特征以及开发过程中遇到的问题,总结分析了提高采收率的相关技术与方法,并对EGR技术的发展提出了建议。该成果对气藏提高采收率有重要的借鉴和推广意义。
Since 2000, China has been ranked as one of the top countries in gas production. Nevertheless, the domestic gas production can hardly satisfy the need of national economic development. Besides, an increasing number of gas fields have come to the middle or late development stages, and most gas reservoirs have low recovery efficiency due to the low permeability and water drive nature. Therefore, gas recovery enhancement has become an urgent issue. At present, the oil recovery enhancement is well defined, and there are methods describing the remaining oil and a complete set of mature EOR （enhanced oil recovery） technologies. However, the definition and description of EGR （enhanced gas recovery） are still undetermined, and the description method for the distribution of residual gas and EGR technologies are almost unavailable. In view of this, by reviewing a wealth of related literatures, we defined EGR and also described the remaining gas distribution based on the remaining gas abundance. In addition, collecting three typical types （low-permeability, condensate and edge/bottom water） of major gas reservoirs developed at home and abroad, we summarized the geological and development characteristics, and found out the obstructions in the development. In response, we concluded and an- alyzed the relevant technologies and methods for enhancing the gas recovery of such reservoirs, and proposed the suggestions about EGR technology development, which provides a significant reference and popularization basis for EGR measures in fields.
出处
《天然气工业》
EI
CAS
CSCD
北大核心
2014年第2期48-55,共8页
Natural Gas Industry
基金
高等学校博士学科点专项科研基金资助(编号:20115121110002)
关键词
天然气
气藏
提高采收率
低渗透气藏
凝析气藏
边底水气藏
技术
对策
natural gas, reservoir, EGR （enhanced gas recovery）, low-permeability gas reservoir, condensate reservoir, edge/bottomwater drive gas reservoir, technology, countermeasure
