Abstract
The production performance of coalbed methane(CBM)reservoirs with multiple-fractured horizontal well(MFHW)is difficult to solve since the governing equations of fluid flow are highly nonlinear and two-phase flow is involved.Based on the material balance equation(MBE)and the solution of MFHW in rectangular reservoir,the production performance curves of CBM reservoir are obtained using finite difference method and dichotomy method.The solution of the semi-analytical model is validated comparing with numerical solution.Subsequently,the effects of Langmuir volume,Langmuir pressure,fracture number,fracture conductivity and fracture interval on production performance are investigated in detail.Langmuir pressure is negatively correlated with gas production and cumulative gas production.In addition,the increase of fracture number,conductivity and interval all has positive influence on the actual production.With the increase of fracture number and fracture interval,the decline rate of water production and gas production increase.
NSTL