Multi-field Coupled Dynamics Analysis And Optimization Based On Horizontal Well Multi-stage Fracturing RFID Communication Tags

Shale gas has become a new direction of China's energy development,also will become an important part of green energy in the future.Multistage horizontal well fracturing technology is the most widely used way to shale gas development at present.In recent years,multistage horizontal well fracturing technology based on RFID intelligent sliding sleeve which can realize infinite level fracturing is gradually applied to the field of horizontal well fracturing.But the technology still has some problem that label ball down speed changes large caused by control difficult at wellhead and RFID label ball has low communication efficiency at well bottom.Based on these background,this paper carried out detailed study from the following contents.(1)Investigate the multistage horizontal well fracturing technology,analyse the good prospect and some defects of multistage horizontal well fracturing technology based on RFID intelligent sliding sleeve.Investigate the present research situation of fluid carrying object migration in the tube and multi-field coupling problems,carry out theoretical study and simulation analysis about the rules of fluid carrying object migration in the large vertical depth,large temperature difference,large pressure change tube.(2)Considering the heat conduction of layer,annulus space fluid and tubing,combining continuity equation,momentum equation and energy conservation equation and heat transfer formula,establish mathematical model described temperature,pressure,velocity,density and viscosity coupled effect of the fluid in the large vertical depth,large temperature difference,large pressure change tube.Solve the mathematical model used four-order Range-Kuttle method,get the coupling field distribution along the vertical well.Research the influence of inlet boundary conditions on the coupling field distribution and analysis the reasons.(3)Take simulation analysis of label deformation by Abaqus software,dynamics analysis of label by COMSOL software,treat the fluid coupling field distribution as the one-way coupling boundary condition,solve the motion state of the label and its location at any time.(4)Carry out diameter optimization research of the label combined with the static applied force simulation and mechanical model analysis.Carry out comparative study of trailing vortex state of different structure label by COMSOL software.Carry out comparative study of Motion animation of different structure label by FLUENT software.Put forward a golf ball shaped structure which has a better working effect,realize the goal that improved the efficiency of fluid carrying label move and the success rate of RFID communication.Research results provide theory support for the precision control of horizontal multistage fracturing,reduce the cost of shale gas fracturing,make a contribution to scale development and rapid development of the shale gas industry.It can also provide theoretical support for more researches about the rules of fluid carrying object migration in the large vertical depth,large temperature difference,large pressure change tube such as seafloor mine transportation in pipeline,rescue for submarine and so on.