The Impact Of The Perforation Parameters On Hydraulic Fracturing In Tight Oil Reservoir

The development of tight oil and other unconventional oil and gas has become a research hotspot in petroleum engineering field.Hydraulic fracturing made an indelible contribution to the development of unconventional oil and gas.Perforation is not only the key channel connecting the wellbore and fracture and formation but also an important channel for oil and gas migration.If the hydraulic fracturing effect wanted to be enhanced the perforation must be considered.At the same time the special properties of tight oil increase the complexity of the problem.It is essential to design a perforation scheme to achieve an efficient hydraulic fracture stimulation treatment.This paper selected the method of numerical simulation and physical simulation to discuss the impact of perforation parameters on hydraulic fracturing.The research contents were carried out on the following.1?Based on the predecessors' work combined with the actual production experience the relationship between perforation and hydraulic fracturing was summed up.2?The appropriate vertical well and horizontal well models were established based on the finite element method.The impact of the perforation parameters on fracture pressure was analyzed.At the same time the impact of the perforation parameters on the initiation position was analyzed.It discussed the formation of different fracture including vertical fracture,horizontal fracture,double fractures,multiple fractures and volume fractures.3?Based on the basis of fracture mechanics the fracture-stress coupled model was set up.The influence of perforation parameters and formation parameters on fracture propagation trajectory was studied under different conditions.4?Transverse perforation was studied by physical simulation and numerical simulation.It showed that fracture caused by transverse perforation was produced vertical to minimum principal stress direction.However along the perforating direction fractures will become relatively tortuous and more complicated.It will do certain contribution to SRV fracturing in vertical well.