水侵对气藏出砂的影响研究

Research about Influence of Water Invasion on Sanding in Gas Reservoirs

国内外对于油藏的出砂问题研究较多,而对于气井的出砂研究很少。随着本世纪天然气工业的蓬勃发展与天然气资源的进一步开发,气藏出砂问题越来越成为天然气工业高速发展所必须解决的具体问题。从国内各出砂气藏的生产情况来看,引起出砂的因素很多,其中以水侵最为普遍,影响也最为严重。因此,对气藏水侵造成出砂的机理进行研究是非常必要的。通过大量文献调查研究,在总结气藏的出砂类型,说明气藏水侵水的来源的基础上提出了水侵造成出砂的微观机理:(1)水侵造成储层敏感;(2)水侵增大流体粘度;(3)水侵导致液阻效应。对水侵造成气藏出砂的微观机理的研究,为具有水侵趋势或已经水侵的气藏采取针对性的处理措施提供了理论依据。

A large number of researches on sanding of oil reservoirs have been done at home and abroad, whereas few of researches on sanding of gas reservoir have been developed. With the flourishing development of natural gas industry and the further exploitation of nature gas resources in the present century, sanding of gas reservoirs has gradually become an arduous challenge to natural gas industrys high-speed development. According to the production of sanding gas reservoirs at home, there are too many factors resulting in sanding, among which water invasion is the most common and has the most serious influence. Therefore, it is very necessary to study the mechanism of sanding as a result of water invasion in gas reservoirs. The authors, having studied a lot of literatures, summarize the sanding types of gas reservoirs and describe the source of invasion water. What is more, they present the microscopic sanding mechanisms including reservoir sensibility, fluid viscosity increase and liquid jaming effect as a result of water invasion in gas reservoirs. Through the study on the microscopic mechanisms of sanding as a result of water invasion in gas reservoirs, they provide a theoretical basis for taking corresponding measures to handle those gas reservoirs tending to be invaded or having been invaded by water.