摘要
致密砂岩气藏复杂地质特性和特殊渗流机理造成相当一部分储量难以得到有效动用。以川西新场气田Js12、Js32气藏为例,在大量室内实验及现场试验的基础上,对致密砂岩气藏渗流机理进行了深入的研究,认为水锁效应、应力敏感伤害、启动压力效应是影响储量难以动用的主要影响因素。目前的生产压差为10MPa,远大于合理的生产压差7MPa,造成较严重的应力敏感伤害;压裂过程中水锁效应则导致压裂液返排率低,压裂液滤失带启动压力高,气相渗透率低,制约了压裂开发的效果。以低伤害为核心,高效返排为手段的大型加砂压裂技术、多层压裂合层套采技术、水平井及水平井压裂技术是开发新场气田Js12、Js32气藏难动用储量的主要技术手段。
Complicated geologic characteristics and special flow mechanism of tight sand gas reservoirs make a lot of reserves difficult to be developed.The exploitation of difficult-to-produce reserves is an important subject.In this paper,based on a lot experiment,the flow mechanism of tight sand gas reservoirs of Js12 and Js32 in Xinchang gas field are studied,and the factors influencing the exploitation of difficult-to-produce reserves are analyzed.Accordingly,corresponding development strategies are put forward.As a result,water lock,stress sensitivity and threshold pressure effect are main influencing factors as to difficult-to-produce reserves.The present production pressure difference is 10MPa,much higher than reasonable pressure difference 7MPa,which results in severe stress sensitivity damage.Massive hydraulic fracturing technology with low harmful and high fracturing fluid back flow technology,multi-layer fracturing technology and horizontal well technology are main exploitation strategies as to difficult-to-produce reserves in Xinchang Js12 and Js32 gas reservoir.
出处
《西南石油大学学报（自然科学版）》
CAS
CSCD
北大核心
2008年第4期77-80,共4页
Journal of Southwest Petroleum University(Science & Technology Edition)
基金
国家科技支撑计划课题"复杂油气田高效开发技术研究"(2006BAB03B)
关键词
致密气藏
难动用储量
大型压裂
多层压裂
水平井技术
tight sand gas reservoirs
difficult-to-produce reserves
massive hydraulic fracturing
multi-layer fracturing
horizontal well technology
