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大量的天然气储存于低渗透、特低渗透地层中，大力压裂是实现其经济开发的必要手段，气藏的水力压裂面临着较油藏更多的不利因素，因此大量的水力压裂实践未能取得良好的效果。针对这种现状，分析了影响低渗稼气藏压裂效果的因素及其作用机理，主要包括：地层务害的来主机理；支撑剂导流的影响因素、作用机理及影响程度；压裂设计中容易出现的技术缺陷；气井压裂后管理运动支持裂缝的影响。由上氏渗透气藏水力压裂要解决的中心问题是

A RESEARCH ON THE HYDRAULIC FRACTURING IN LOW PERMEABILITY GAS RESERVOIR

A great deal of natural gas was found in low and extralow permeability reservoirs and the hydraulic fracturing is the necessary means to realize its economic development.Because the unfavourable factors encounted in the hydraulic fracturing in gas reservoirs are more than those in oil reservoirs,the good results can't be achieved in many of the hydraulic fracturing works.According to this,the factors influencing fracturing results and their action mechanisms are analyzed,mainly including:the origin and mechanism of formation damage;the influence factors,action mechanism and influence level of the diverting capacity of proping agent;the technical shortcomings easily found in the fracturing design;and the influence of the gas well management after fracturing on propped fractures.On the basis of the analysis mentioned above,the principal problem that must be solved for the hydraulic fracturing in low permeability gas reservoir is to decrease the damage of fracturing fluid so as to increase the diverting capacity of fractures.For this reason the thought and methods of the design and implementation of the hydraulic fracturing in low permeability gas reservoir are proposed,they are:optimizing the formulation of fracturing fluid and the procedure of adding gel breaker and utilizing the propping agent with excellent performance;grasping the key basic parameters and using pseudothreedimensional software to enhance the reliability of the fracturing design,carrying out operating parameter design according to the gas reservoir characteristics and the diverting capacity of fractures to raise the suitability of the fracturing design;and setting up a set of complete operating procedures so as to perfect and improve the hydraulic fracturing techniques for low permeability gas reservoir.