临汾区块深层煤层气井开发层系选择探讨

Discussion of the selection for producing layers of deep CBM wells in Linfen Block

对临汾区块不同产层组合气井的生产差异及主力煤层产能进行研究,为开发层系选择提供依据。首先,利用排采数据分析了不同产层组合情况下的生产效果,结果显示5号+8号煤合采井的生产效果最好,单采5号煤井的效果次之,单采8号煤井的效果最差。其次,基于渗流的基本原理、产出剖面测试资料、部分封层井与水平井的生产情况以及主要煤层开发潜力分析,进一步研究了5号煤和8号煤层的生产能力,结果表明5号煤层主力产气层,8号煤为主要产水层。在此基础上,通过综合对比分析,探讨了开发层系的选择问题,提出以5号煤单采、8号煤作为层间接替的开发建议。

To provide the basis for the selection of the development layers,the difference of production in gas wells with different combination of coalbeds and the capacity of main coal seams in Linfen area was studied.Firstly,the production effect of gas wells with different combination of coalbeds was analyzed by using the data of production.The results show that the effect of muti-layer production of No.5 ＋No.8 is the best,the effect of single-layer of No.5 is the second,and the effect of single-layer of No. 8 is the worst. Secondly,the capacity of No. 5 coalbed and No. 8 coalbed were studied based on the basic principles of seepage,production profile testing data,production of sealed wells and horizontal wells,and evaluation of coalbed methane development potential. The results show that the No. 5 coalbed is the main gas producing layer,and the No.8 coalbed is the main aquifer.On this basis,through comprehensive comparison and analysis,the proposal that taking No.5 coalbed as single-layer production and making No.8 coalbed as interlayer replacement was provided.