Experimental Study On Jet Failure Of A Wall Attached Jet Generator In Solid-liquid Mixing State

The jet torsion impact,with its high efficiency of rock breaking efficiency,has gradually replaced the traditional drilling tools in foreign oil and gas mining.It is restricted by the technical blockade,and it is difficult to contact the molding equipment at home.Although some achievements have been achieved in domestic research,the short life expansion limits the drilling tools only in the experimental stage.The life of the torsion impactor affects the life of the initial rotary punching device,and the life of the jet element is very important to the impact of the whole drilling tool.In this paper,based on the working conditions of the torque percussion drill in the deep well operation in the real environment,the problems in the use of the jet element are analyzed.The reasons for jet instability due to fluidic components are explored from the aspects of structure design,theoretical analysis of internal flow field,CFD flow field simulation and test.Combined with the internal structure of components,the optimization design plan of components is put forward.The relationship among energy,pressure and flow velocity around the flow field is studied by simulation analysis,and the following conclusions are drawn from the actual test results.1.The leakage of the jet element is caused by excessive wear inside the jet,and its main wear position is at the conjunction of the wall and the shoulder.2.The large flow rate of the jet is related to the position of the wear of the jet element.The larger the flow,the closer the position of the wear to the upper end of the emptying channel.3.When the flow rate reaches a certain value,the abrasion resistance of the jet element will tend to reach a stable value which is related to the time of the formation of the material of the jet element.4.Improving the height of the cutting shoulder of the jet element can play a positive role in improving the service life of the jet element.Through the theoretical analysis,simulation analysis and experimental analysis of the flow field of the fluidic components,the main causes and locations of the failure of the fluidic components have been studied.In terms of improving the life of components,the following two aspects can be done:1.select erosion resistant material processing element2.theoretically,by improving the position of the shoulder,we can slow down the failure time of the jet.The conclusions from the above two aspects can provide some reference for the future scholars to optimize the design of the structure of the jet elements.