Research On Optimization Of Fracturing Parameters In Dongping Bedrock Gas Reservoir

The Dongping bedrock gas reservoir is a low-porosity,low-permeability reservoir with abundant reserves.However,it needs fracturing to increase production.Since the overall development is still in its initial stage,the understanding of the stimulation mechanism and construction plan design is insufficient.This paper systematically studies the fracturing stimulation technology plan for Dongping bedrock gas reservoir.Based on its reservoir conditions and geological features,this paper analyzes the weak discontinuity,geological structure,brittleness index,stress conditions and fracturing technology of the bedrock gas reservoir via reservoir property analysis experiments and rock mechanics experiments.The conclusion is that the target block in Dongping is suitable for volume fracturing which can form a complex fracture network.Compared with conventional fracturing to form a single major fracture,the volume fracturing has a higher productivity.The fracturing productivity model is established.The fracture parameters such as the major fracture length,the major fracture conductivity and others are optimized.Based on the facture network model theory,the Meyer software is used to simulate fracture network propagation and optimize the influences of construction parameters(pre-flushing fluid percentage,sand concentration,delivery rate and proppant slug).Finally,an optimized fracturing pumping design for a single well is established.The construction results are evaluated in terms of construction parameters and productivity.This paper illustrates the advantage of volume fracturing.This paper has great significance on the efficient development about the Dongping bedrock gas reservoir and provides certain references for field construction.