单通道井开发海上边际气田可行性研究与实践

Feasibility Study of the Development of Marginal Offshore Gas Fields by Using Single-channel Wells and Its Practice

由于储量规模小、丰度低,单井产量不高的气田,利用常规方法开采,气田开发建设的投资规模大,生产成本高,经济效益差或无经济效益。从地质油藏角度开展单通道(小井眼)井在边际气田的应用的可行性分析,并结合海上油气田单通道井先导性试验,认为采用单通道钻完井技术可以降低钻井成本,通过用钻小井眼井节省的钻完井费用,多钻开发井,可以有效控制储量动用程度,提高采收率。该项技术适合在储量丰度较小的边际油气田或开发中后期调整井中推广应用。

Because of small amount of reserves,low abundance and poor per well production in marginal offshore gas fields,high cost was induced in their development by using conventional method,and large investment was needed in the gas field construction with high production cost,poor or even no economic benefits was caused.Feasibility study was carried out on the application of single channel(slim-hole)wells in marginal gas fields from a aspects of geology and reservoirs,and the pilot test of single channel wells in offshore oilfields was studied.The research shows that the single channel drilling and completion technology could reduce drilling cost,and accordingly,the expenses saved by slim-hole drilling and completion can be used to drill more development wells.Therefore,the amount of controlled reserves and EOR can be enhanced.Especially,the technology is suitable for popularization and application in marginal oil and gas fields which have low abundance and in the adjustment wells in the mid-late periods of development.