Study On The Evolution Law Of Shallow Hydraulic Fractures Considering Temperature Effects

Shallow hydraulic fracturing is a process involving multiple fields of stress field,fluid field and temperature field.Temperature will affect the properties of the rock medium and the characteristics of the fracturing fluid,thus affecting the extended evolution of shallow hydraulic fractures.The application of shallow hydraulic fracturing is very extensive,including the actual exploration and development of shallow coalbed methane and the shallow burial of nuclear waste.Temperature is a very important factor.In these practical engineering applications,the extended evolution law of shallow hydraulic fractures is very important,so it is necessary to consider the influence of temperature on the evolution of shallow hydraulic fractures.Based on the study of shallow hydraulic fracturing by scholars at home and abroad,this paper studies the extended evolution law of shallow hydraulic fractures,and simulates the normal temperature and temperature change conditions based on the finite element method,ie fluid-structure coupling and fluid-solid coupling.In both cases,the evolution of shallow hydraulic fractures is extended.It includes the extended evolution law of shallow hydraulic fractures under both normal temperature and variable temperature conditions.The effects of rock medium properties such as elastic modulus and Poisson's ratio on the evolution of shallow hydraulic fractures were studied.The characteristics of fracturing fluid such as fracturing fluid viscosity and fracturing fluid injection velocity for shallow hydraulic fractures were studied.The influence of evolution law;the law of the variation of the width and length of shallow hydraulic fractures with time under normal temperature conditions is studied,and the curve of injection pressure of shallow hydraulic fractures with time is obtained.The effect of viscosity ratio on the extended evolution law of shallow hydraulic fractures under variable temperature conditions is studied.The extension and evolution of shallow hydraulic fracture width and length with time are obtained.The temperature distribution of shallow hydraulic fractures with time is obtained.Evolution law;the curve of injection pressure of shallow hydraulic fracture orifice with time is obtained.