Design And Flow Simulation Of Double Torsion Impactor For Drilling

Oil and gas resources has always been our strategic energy resource system,however,with the increasing demand of energy exploration and development blocks,well becomes deeper and rock hardness and ductility increases.Lithology changes with the increasing difficulty of hard formation,causing conventional drilling PDC drill bit more likely to occur the phenomenon of stick-slip vibration or "card slip ".This can result in lower ROP,field data show that the average penetration rate of only 15% in deep section to 30% of the upper well section average ROP in some areas even less than 8%.Deep drill is tightened like clockwork.The rotary torque is accumulated and then quickly released,when by the PDC drill bit tooth load is much higher than usual.PDC drill bit is vulnerable about damage,leading to a short bit life.The drilling speed is influenced,increasing drilling cost.Thus it can effectively improve the overall efficiency of oil and gas exploration and development if card slip phenomenon is eliminated.It is alarmingly imminent.to solve the problem of card slip.The DTH drilling principle of double-acting hydraulic axial is applied in the invention.DTH drilling is driven by hydraulic thrust rather than spring force.It is characterized by simple structure and stable function.Skillfully drilling fluid energy can be converted into high-frequency portion of the circumferential twisting,and rock-breaking power downhole mechanical energy,which can act directly on the drill bit.This paper summarizes patents of domestic and foreign torque impactor.Compared with DTH drilling,torque impactor can increase the rate of penetration,which is more suitable to drill deep and poor strata.The torque impactor is designed in combination with DTH driller structure.The dynamic model is established based on hydraulics Bernoulli equation.Structure parameters are optimized to provide reference for designing appropriate small-caliber double torsion impactor.Impact torque,impact frequency.In terms of requirements of the simple structure and stable performances,key parts of the paper double torsion impactor are designed,including threaded joints,anti-out device,positioning spline,nozzle selection,and guide cover.A 3D structural picture of Φ215.9 double torsion impactor is drawn through SolidWorks.All parts and assemblies of the 3D model are given using three-dimensional design software.Finally,impact of different factors on torque and impact frequency are calculated and analyzed by excel spreadsheet equation,including restricting nozzle,pump pressure valve,closing acceleration angle,and freely rotating angle.