张士杰 1廖伟 1胡书勇 2罗海涛 1李欣潞 1张季2
作者信息
- 1. 中国石油新疆油田储气库有限公司 新疆 昌吉 831200
- 2. 油气藏地质及开发工程全国重点实验室·西南石油大学 四川 成都 610500
- 折叠
摘要
Abstract
To understand the gas-water migration dynamic behaviors and the capacity variation laws of underground gas storage(UGS)converted from edge-bottom water gas reservoir during the multi-cycle injection and production process,the operation performance of the H UGS was analyzed and evaluated by using the numerical simulation technology,from the aspects of the variation of gas injection-production rate,the distribution characteristics of formation pressure,and the lateral and vertical variation of gas-water contact.The results are obtained in four aspects.First,in the process of multi-cycle injection and production,as the number of gas injectors and producers increases,the daily gas injection and production of the UGS increase steadily,and its peak-shaving and supply-guarantee capability gets enhanced year by year.Second,after multi-cycle injection and production,the formation pressure spreads gradually from structural high to structural low,and the pressure distribution tends to become more balanced.The gas injected into the UGS can be produced effectively as a whole.Third,the injection and production process of UGS is obviously different from gas reservoir development process.During the development process,gas-water migration is mainly unidirectional,with the gas-water front advancing into the interior of gas reservoir.Whereas in the process of UGS operation,multi-cycle injection and production are alternated,and the gas-water front advances outward from the UGS during injection but inward into the gas reservoir during production,i.e.,moving forward and backward with the alteration of injection and production.Fourth,as the multiple-cycle injection and production goes on,the formation water is drained out of reservoir pores,and gas saturation increases correspondingly,which not only reduces the water invasion risk of the UGS in the production process compared with that in the development process,but also provides the UGS with the potential of continuous capacity expansion.The conclusion is that the gas-water migration dynamic behaviors and capacity variation laws of the UGSs converted form edge-bottom water gas reservoirs have a direct influence on their storage capacity and producing efficiency,and the research results are referential for the injection and production design and efficient operation of similar UGSs.关键词
边底水气藏/地下储气库/多周期注采/气水运移/数值模拟/库容量/动用效率Key words
Edge-bottom water gas reservoir/Underground gas storage/Multi-cycle injection and production/Gas-water migration/Numerical simulation/Storage capacity/Producing efficiency
