Design And Simulation Of Hydraulic Blasting Perforation Supercharger Structure

In the operation of oil and gas resources in low permeability reservoirs,hydraulic sandblasting perforation fracturing technology has become an important means for unconventional oil and gas fields because of its features of accurate positioning,deeper perforation depth and no damage to other parts of the tool after perforation.In the process of hydraulic sand blasting and perforating fracturing,the perforating fluid containing abrasive needs a lot of hydraulic energy to impact and break casing,cementing cement ring and rock.The traditional ground pressurization method has high energy consumption and high sealing pressure of the high-pressure fluid transmission pipeline,which is easy to leak and the rupture and failure of the high-pressure pipeline,which will cause harm to the construction personnel.However,no mature downhole supercharger has been put into production due to its complex internal flow channel,difficult processing and low service life.Therefore,it is of great practical significance to design a kind of downhole supercharger with simple structure,easy processing,pressurization and high efficiency for hydraulic sandblasting perforation operation and improving oil and gas recovery in deep strata and low permeability reservoirs.Based on this,this paper mainly carries out the following research:(1)According to the fourth strength theory of material and Mohr-Coulomb criterion of rock material,the stress analysis of casing,cement ring and rock crushed by high-pressure jet impact is carried out.Based on the theory of erosion wear,the mechanism of abrasive jet erosion of casing,cement ring and rock in the process of hydraulic sandblasting perforation is studied.(2)The structure design of the hydraulic sand blasting and perforating supercharger,which mainly includes the design of the booster mechanism,the design of the reversing mechanism and the design of the flow channel.Based on the theory of fluid mechanics,the parameters of the piston diameter,outlet diameter of high pressure,outlet diameter of return low pressure and other key components of the hydraulic sandblasting perforation supercharger are designed.(3)Based on the finite element theory,the strength check and modal analysis of the hydraulic sand blasting and perforating supercharger are carried out.(4)Based on the Fluent dynamic grid method,the factors affecting the pressurization effect are analyzed,and the influences of different high-pressure outlet diameters,different piston area ratios and different leakage layer thicknesses on the pressurization efficiency of the hydraulic sandblasting perforation supercharger are analyzed.(5)Based on the erosion theory,the high pressure nozzle shape design of the hydraulic sand blasting perforating supercharger was designed,and the effects of different particle diameters,different incidence velocity and different particle volume fraction on the efficiency of hydraulic sand blasting perforating were analyzed.