胜利油气区浅层气藏的开采规律研究

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胜利油气区的浅层气藏主要分布于第三系馆陶组、明化镇组及第四系平原组。气藏类型主要为透镜状岩性气藏,少量为构造—岩性气藏。由于气层埋藏浅、成岩性差、胶结疏松,以及大部分气砂体存在边底水,存在气井易出水、出砂、稳产期短等开发特征。经过20余年的开发实践认识到:①稳定、合理的工作制度是延长气井自喷期的基础;②新井先期防砂是延长气砂体生命期的必要保证;③自下而上逐层上返的分层开采是浅层气藏生产的基本原则;④合理的射开程度是延长边底水气井无水采气期的先决条件;⑤降低井口回压,排水采气是增加气砂体可采储量的有效途径。 The shallow gas reservoirs in the Shengli Oil and Gas Region are mainly located in the Tertiary Guantao Formation, Minghuazhen Formation and Quaternary Plain. The gas reservoirs are mainly lenticular gas reservoirs and a few are tectonic-lithologic gas reservoirs. Due to the shallow burial of gas reservoirs, poor diagenesis, loose cementing, and the presence of edge-bottom water in most of the gas sand bodies, there are some development features such as easing water outflow, sand production and short stable production period. After more than 20 years of development practice, it has been realized that: ① stable and reasonable working system is the basis for prolonging the self-blasting period of gas wells; ② the prophase sand control of Xinjing well is the necessary guarantee to prolong the life of gas sand bodies; ③ the bottom- Stratified mining is the basic principle of shallow gas reservoirs; (4) a reasonable degree of shot blasting is a prerequisite for prolonging the period of dry gas production at the edge of the water and gas wells; (5) reducing backhole pressure and drainage gas recovery Effective way of reserves.
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