Research On Efficient Rock Breaking Technology Of Hard Formation Based On Hydraulic Impactor

In recent years,with the continuous deepening of China’s oil and gas exploration and development work,the drillability of the formation has deteriorated and the hardness of the rock has increased.The hydrodynamic rotary drilling technology combines the characteristics of conventional rotary drilling and percussion drilling,and provides a new method for easing the wear and stick-slip vibration of the drill bit and improving the drilling efficiency of hard formations.At present,domestic and foreign research work on hydrodynamic rotary drilling technology mainly focuses on the structural design and optimization design of hydrodynamic impactors.There is relatively little research on the matching of hydrodynamic impactors and drill bits,which is precisely the hydrodynamic impact.Rotary drilling is the key to speed up drilling.Therefore,based on the theory of rock mechanics,the working principle of the hydraulic impactor,the rock breaking mechanism,etc.,combined with experimental research,simulation analysis and application analysis,the impact law of the impact performance of the hydraulic impactor is analyzed.Using the Workbench simulation environment,the two types of formations of sandstone and limestone assisted by the hydraulic impactor PDC bit were simulated and analyzed,and the impact rule of impact performance and drilling parameters on mechanical drilling speed was obtained,as well as broken sandstone and limestone.The optimal parameter combination in rock time.Finally,through the application analysis of the hydraulic impactor in the hard formation of the Mahu area in Xinjiang,combined with the simulation analysis results,it was verified that the hydraulic impactor is used together with the PDC bit in the hard formation,which can alleviate the stick-slip vibration of the PDC bit and the bit The wear is effective in breaking rocks efficiently and increasing the drilling speed.