Research Of High Energy Gas Fracture Propagation For Radial Well

After the completion of the radial well,only a few radial boreholes communicated with the reservoir,resulting in the production of oil and gas wells not reaching the growth expectations.Therefore,the transformation of radial wells through high-energy gas fracturing has become a viable option.In this paper,based on the theory of solid mechanics and rock mechanics,combined with the JWL equation of state,SPH particle method and cohesive element theory,a high-energy gas fracturing model for radial wells is established,and the elastic modulus,Poisson’s ratio,horizontal principal stress difference,diameter The effects of directional well diameter and radial well azimuth angle on fracture initiation;based on the damage characteristics of cohesive bonding units,by pre-setting cohesive fracture units,the horizontal principal stress difference,radial well diameter,elastic modulus,Poisson’s ratio,and charge were studied The influence of the quantity and the number of initiation points on crack propagation.The results show that the elastic modulus,azimuth of the radial well are proportional to the initiation pressure,and the Poisson’s ratio,the diameter of the radial well,and the difference in horizontal principal stress are inversely proportional to the initiation pressure.In the expansion stage,the greater the elastic modulus,the greater the length of the crack and the smaller the height;the effect of the change in Poisson’s ratio on the crack length and height is not obvious;the greater the difference in horizontal principal stress caused by the change in maximum horizontal principal stress,The shorter the length of the fracture,the less affected the height;the greater the difference in horizontal principal stress caused by the change in the minimum horizontal principal stress,the smaller the effect on the length of the fracture,and the higher the fracture height;the larger the radial well diameter,the fracture The smaller the length and the height;the larger the fracturing charge,the longer the fracture is;the simulation of setting multiple initiation points of the fracturing agent,it is found that increasing the explosion point only has a significant effect on the fracture height.The results of this study can provide relevant guidance for the design,parameter control and optimization of high-energy gas fracturing in radial wells,and have important theoretical value.