Research On Temporary Plug Steering Acid Pressure Technology In Tahe Oilfield

The reservoir depth of carbonate reservoirs in Tahe Oilfield is generally between 5400 and 6900 m.The reservoir is characterized by deep burial depth,high ground temperature,and high pressure.Most oil wells can be produced through reservoir reconstruction.Nowadays,Tahe Oilfield Carbonate reservoirs are generally reformed using conventional acid-pressure processes.This method has the following major problems: high reservoir geostress difference,dispersion of reservoirs,and fractures generally extending along the direction of maximum principal stress,forming a range of fracture networks.It is very limited that how to implement the acid pressure process to solve the above problems can form a certain scale of fracture networks and communicate oil and gas channels.This is a problem that needs to be solved to achieve reservoir stimulation.In this paper,numerical simulations and physical simulation studies are conducted.Numerical simulations study the law of crack propagation and the formation mechanism of the seam network.Simultaneously,the distribution of the stress field after the temporary stoppage steering is simulated and combined with the actual reservoir conditions to develop carbonate rocks.Study on Physical Experiment of Composite Temporary Plugging of Reservoir Fibers and Particles.Studies have shown that horizontal stress difference is small,Young's modulus is larger,the natural fracture angle and density is larger,the viscosity of the fracturing fluid is lower and the larger displacement is conducive to the formation of a complex fracture network.According to the study of temporary plug steering digital model,the normal stress in the direction of the maximum principal stress is higher than the normal stress in the direction of the minimum principal stress in the crack tip region.Next to the temporary blocking point,preset natural cracks are added to guide the cracks.Temporary blocking steering experimental study,preferably 1.8% of the fiber concentration and 6~8mm fiber length for temporary plugging;temporary blocking agent type,the ball is too large to increase the blocking of the play,so to control the addition of the ball A large amount of small balls for large slit widths is conducive to successful sealing.Through numerical simulations and physical simulation studies,revealed the mechanism of crack propagation,the control conditions for the formation of the seam network,and the stress changes after temporary blocking,as well as the evaluation of the effect of fiber and small ball composite temporary plugging,which will be carbonate in Tahe Oilfield.Rock reservoirs provide temporary support for the transition to acid pressing process.