Study On Fracturing Technology Of Horizontal Branching Well Of CBM

China has abundant reserves of coalbed methane,but the low output of single well is still the main factor that limits the development of coalbed methane in China.Aiming at the problems of low production of straight wells in coal bed gas and the high cost and difficult construction of horizontal well,the paper takes the CG block of Qinshui Basin as the research object,puts forward the fracturing technique of horizontal branch well with short branch of vertical well side drilling,and systematically explores and studies the fracturing technology to realize the dual advantage of improving productivity and saving cost.The adaptability of horizontal multilateral wells and fractured reservoirs is analyzed through the investigation of geological data and Experimental Research on mechanical properties of target coal seams.The geological model of the block is established by CMG numerical simulation software,and the parameters of branch direction,branch length,branch angle and branch number are optimized.Orthogonalization experiments were carried out to analyze the influence of different parameters on productivity after interference.The initiation and extension mechanism of fracturing in horizontal multilateral wells is studied by theoretical and numerical simulation.The production capacity of the technology is analyzed and compared with the production capacity of horizontal well fracturing and horizontal well fracturing,which can provide theoretical support for the field application of horizontal branch fracturing.Combined with the optimization of the structural parameters of horizontal branch wells and the study of various mechanisms of horizontal branching well fracturing,the parameters of fractured fractures are optimized and the deep analysis is carried out.On the basis of field data,a number of construction parameters were further optimized by Meyer fracturing software.Finally,in order to better promote the field application of horizontal branch well fracturing,from the point of view of economy and construction,the fracturing fluid,proppant,fracturing method and so on are optimized,and the fracturing technology system of horizontal branch well is further perfected.