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

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 pro- duction effect of gas wells with different combination of coalbeds was analyzed by using the data of production. The re- sults 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 compar- ison and analysis,the proposal that taking No. 5 coalbed as single-layer production and making No. 8 coalbed as inter- layer replacement was provided.