Simulation And Research On Integral Fracturing Of Coal Seam

Integral fracturing is an important technical means of conventional reservoir development, it was already more mature; but coal and coalbed methane development had their own characteristics, integral fracturing technology of conventional reservoir couldn’t be applicable to coalbed methane development overally, the problem of simulation of integral fracturing in coal and program development and the matching of artificial fracture and well network of development were difficult problems what plagued the exploration and development of coalbed methane in long-term.This thesis based on the basic theory of fracture, combined the geological features of seam fracturing, based on the results of microseismic fracture monitoring and inclinometer, comprehensive determined that the fracture of coal seam formed by hydraulic fracturing were fractures of network, it also counted the general size of hydraulic fracture of the coal seam fracturing and the basic conditions for forming the size of fracture have been given.A seam fracturing simulation model was researched in this thesis, and the software system was be completed, it was applied to simulation the fracture’s length and height of 4 wells and 5 coal seams, the simulation results had a higher degree agreement with the results of micro-seismic monitoring and inclinometer, and it satisfied the requirerments of the field of engineering application.Based on the mechanism of coal seam seepage, under the conditions with artificial cracks, a numerical simulation model of coalbed methane reservoirs was researched in this thesis, the model included the vapor pressure equation and saturation equation and the aqueous phase pressure equation and saturation equation, numerical simulation model had been calculated; Also, the coal seam fracturing simulation model was also founded and completed the corresponding calculation.It analysed the effects of coal seam parameters, fracturing parameters and production parameters on the coal seam fracturing, confirmed the parameters of integral fracturing of coal seam in this thesis. Considering the block specific circumstances of Hancheng, Baode, Daning-Jixian, depending on the production of coal seam permeability and different pressure, gave an integral fracturing program of seam fracturing to simulate, completed the optimization of fracturing program, achieved the matching of artificial fracture and well network of development, this thesis recommended to adapt the overall development plan seam fracturing fracturing wells existing network, and also gave the optimal solutions and adapt well fracturing network.