Research On Hydraulic Impact Downhole Power Drilling Tools

With the increasing demand for petroleum resources,petroleum exploitation gradually develops from shallow and middle strata to deep strata,and the difficulty and cost of petroleum exploitation will also increase with the increase of strata depth.At present,the problem of low efficiency and high cost in deep hard strata drilling is a huge problem in the drilling process of deep and ultra-deep Wells.Therefore,it is of great significance to develop new drilling acceleration tools to improve drilling efficiency and reduce drilling cost.At present,some drilling speed-increasing tools have appeared at home and abroad,but there are still many shortcomings.In this paper,based on a large number of investigations on existing drilling speed-increasing tools,a downhole drilling speed-raising tool is designed for the hard formation of deep and ultra-deep Wells,which uses the water hammer force generated by drilling fluid to provide the drill bit with periodic axial impact.In this paper,the effects of tool structure,working principle,structural parameters,water hammer calculation,impact force,impact frequency and impact vibration on the tool are studied,and the prototype and laboratory test of the tool are carried out.Firstly,this paper gives the tool design scheme,completes the overall design of the tool and explains its working principle.This paper analyzes the influence of the tool structure parameters on the flow area,and obtains the internal relationship between the tool structure parameters and the impact force and impact frequency.Secondly,based on the existing water hammer theory,the theoretical formula of continuous water hammer calculation is further derived.Through theoretical calculations,this paper obtains the magnitude of water hammer in different situations.The water hammer simulation was performed using ANSYS Fluent software and the pressure at each section of the tool was obtained.According to the force analysis,this paper calculates the impact force of the tool.Then,this paper analyzes the influence of the axial impact force generated by the tool on the lower screw drilling tool,and proves that the impact assembly does not affect the normal operation of the powertrain,and has little effect on the life of the screw rotor;Finally,according to the design drawings,we processed the experimental prototype and conducted an indoor test.The test verifies the rationality of the tool structure,the feasibility of the working principle and the reliability of the entire tool.