Study On Compressible Evaluation Of WY Shale Gas Reservoir

The opening and expansion of shale fractures is the key technology of fracturing,which is very similar to the principle of rock drillability during drilling,so there is also a compressible concept in the process of shale fracturing."Compressible" is the possibility or difficulty of formation of the complex fracture network of fractured reservoir in order to increase production effectively,it is the precondition and key of optimizing the shale fracturing scheme.At present,there are many methods to evaluate the compressible property of shale gas reservoirs at home and abroad,but there are some limitations in different degrees,no unified scientific and reasonable evaluation method has been formed,and special research is urgently needed.On the basis of investigation and comparison of compressible evaluation methods of shale gas reservoirs,seven comprehensive evaluation parameters of compressible properties of shale gas reservoirs are selected,which are quartz content,clay mineral content,rock brittleness index,horizontal stress difference value,fracture toughness,cohesive force and natural fracture development degree.On the basis of experimental research,statistical analysis and log interpretation correction,the influence of stratum confining pressure and rock anisotropy on compressible index is fully considered,and the calculation method of each index is optimized and integrated,and the mathematical model of comprehensive evaluation of compressible index is established through the normalization of index and weight treatment.According to the WY area,the method of research and formation is used to evaluate the compressible property.On this basis,the WY horizontal well pattern is optimized,and the fracturing engineering technical countermeasures for improving the complexity of fractures in the area are studied.