Design And Research Of The Reciprocating Hydraulic Impactor

Accompanied by the development of the oil industry, the exploration and developmentin the future petroleum oil and gas field will encounter growing old stratum and growing hardrock. When encountered hard formations, drilling efficiency is very low, the life of the drill bitis short, the cycle of drilling is long and the cost is high. To improve drilling speed becomesparticularly important and the technology of impact and rotary drilling is one of the mosteffective way to solve the problems in hard rock drilling. Its essence is a method of drillingwhich combines a single rock-breaking of the impact of drilling and continuous rock-breakingof rotary drilling.This article mainly introduced the significance of hydraulic impactor’s research and thedomestic and foreign research condition and the trend of development and has analyzed eachkind of existing hydraulic impactor’s structure, the performance as well as the good and badpoints. After synthesizing each kind of impactor and combining each kind of literaturematerial, designs one kind of dependent hydraulic impactor. the system adopts the turbinegroup as a major power components, drilling fluid energy conversion. The axial movement ofthe rotary head and shocking tube constitute the entire water distribution mechanism,conformate the valve-action, drive the following components to complete the entire strikingmovement.After determining the structure of the impactor, the two categories parameters of theimpactor to need to determined is the frequency and energy of the impactor. Since the powerunit is provided by the turbine group, the frequency of the impactor is related to the choice ofthe turbine group. By calculating the torque of the rotary units during movement and thetorque provided by the turbine group，it can meet the requirement when there is a balancebetween them. The size of the impactor’s energy is associated with the impactor’s velocity in the case of a certain quality of the hammer and the impactor’s speed is determined by thepressure at both ends, then here is required to complete the calculation of the turbine group’snumber and the pressure loss through full flow path.The impactor’s internal flow field is modeled by the software of solidworks according tohe impactor’s structure calculated and determined. the model is meshed through the GAMBITand imported to Fluent to calculated. From the simulating results obtained as well as thatvelocity and pressure nephogram compared with theoretical results, the analysis of deviation’sreason and rationality should be taken and further to amend the structure of the impactor’sstructure and to complete the engineering drawing by CAD.Finally, according to the structure of the impactor completed experiment program and themain components of the test station are both been designed. The parameters of impactor’s testare collected by sensors, and the sensor calibration devices should as well as been designedbefore the experiment. At last, the both design of the entire reciprocating hydraulic impactorare completed.