异常高压气藏产能特征分析——以四川盆地河坝场构造飞三气藏河坝1井为例

Deliverability characteristics of gas pools with abnormal pressure——an example from well Heba-1 in the third member of the Feixianguan Formation of Hebachang block,the Sichuan Basin

针对川东北河坝区块飞仙关组三段气藏的地质特点,通过对河坝1井的测试和试采资料的分析研究,总结了异常高压气藏的类型和开采动态特征。研究认为,用试采资料求得的气井无阻流量小于1/5产量配产就能充分发挥地层能量,气井弹性产率高、稳产期长、最终采收率高。同时还验证了用井口压力推算井底压力的可靠性,指出了异常高压气藏的开采特征以及开采中所要关注的问题,为开发类似气田提供借鉴。

Aiming at the geological features of gas pools in the third member of Feixiangua Formation, Heba block, northern and eastern Sichuan Basin, the article studies and analyzes the formation test and production test data and summarizes the types of abnormal pressure gas pools and their production performance. The results show that production proration according to a value less than 1/5 of AOF （calculated with production testing data） can bring the formation energy into full play, longer production plateau period, and higher recovery ratio. The research also confirms the reliability of predicting bottom hole pressure with well head pressure and points out production characteristics of abnormal pressure gas pools as well as problems that need to be addressed during the production, providing references for the development of similar gas pools.