Impacts of Water Cross-formational Flow from Roof Rock on the Production Performance of Coalbed Methane Reservoirs

doi:10.11885/j.issn.1674-5086.2020.01.20.02

Abstract

Abstract: Hydraulic fractures always penetrate into the roof rock. The water cross-formational flow from roof rock could apparently affect the production performance of CBM (coalbed methane) reservoirs. According to the crossflow effect on CBM production, two connection models are established to describe the geology relation between coalbed and top aquifer. Then, the effects of top aquifer on methane production performance is studied by numerical simulation under different hydraulic fracture conditions. Further, the production performance is plotted by dimensionless method and the water sources of well are judged in a case study. The results show that production schedule has a slight influence on water production when the water comes from the inner layer. For the top aquifer without a barrier, the fracture penetration ratio in aquifer will delay the gas production. Once the fracture penetrates the aquifer, the penetration ratio has less effect on production. For the top aquifer with a barrier, there exist two stages of gas production increase. When the penetration ratio is under 1/6, the gas production will increase first quickly and then slowly. When the penetration ratio is above 2/6, the gas production will increase first slowly and then quickly, and the production performance is less sensitive to penetration ratio.

Key words: coalbed methane, production performance, roof aquifer, water cross-formational flow, dimensionless curves

CLC Number:

TE319

DU Jia. Impacts of Water Cross-formational Flow from Roof Rock on the Production Performance of Coalbed Methane Reservoirs[J]. 西南石油大学学报(自然科学版), 2020, 42(2): 149-157.

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