Finite Element Simulation Of Hydraulic Fracturing In Shale Gas Reservoir

Shale gas exploitation has become the focus of world oil and gas resources development,and hydraulic fracturing is an important technology for it.The interaction between natural fractures and hydraulic fractures in the shale gas reservoirs poses a greater challenge to the design and construction of fractures.In order to solve the urgent problem of shale gas,it is very important to study the cracking mechanism,fracturing regularity and influencing factors of hydraulic fracturing in shale gas reservoirs,which is very important for fracturing design and final recovery improvement.In this paper,firstly,the research status of numerical simulation of hydraulic fracturing at home and abroad is summarized,so as to the results obtained by numerical simulation.Secondly,a series of numerical simulations are carried out with the example of fracturing wells in Dingshan area.Based on the finite element calculation theory of the seepage and stress coupling of rock mechanics and considering the damage,the mathematical model of hydraulic fracturing of pressurized and fluid filled is established.Then the axisymmetric single slit expansion model of hydraulic fracturing is constructed by ABAQUS software.Thirdly,the distribution of the maximum principal stress,pore pressure and filtration rate in the surrounding fractured fractures during hydraulic fracturing are analyzed.Finally,the effects of parameters such as stress field,porosity ratio,permeability coefficient and injection displacement on the width and slit length of fractured joints are studied by using a single variable method.In addition,ANSYS is used to establish the fracturing model with different boundary conditions,and the hydraulic fracturing process of natural fractures around the wellbore is simulated.In the end,the influence of natural fractures on hydraulic fracturing and the variation law of slit width and slit length are analyzed.