Novel Φ73 Compound Impact Speed-up Drilling Tool Structural Design And Performance Study

In the rapid development of today’s society,petroleum energy plays an indispensable power source in the development.With the increasing demand for oil energy,the surface oil resources in the crust are almost exhausted.Shale gas as a clean energy appears in people’s vision,forcing exploration drilling to develop to long horizontal wells.In the horizontal well coiled tubing operation,with the continuous extension of the horizontal section,the friction of the coiled tubing increases,which is very easy to produce sinusoidal buckling and spiral buckling,resulting in self-locking,which makes the drilling operation fail and complete the drilling ahead of time;moreover,when the bit is in the long horizontal well section,the drill string is unable to exert the bit pressure,resulting in the phenomenon of stick slip and sticking during the operation.In order to solve these problems,this paper designs a new type of small-diameter compound percussive speed-up drilling tool,which solves the buckling problem of coiled tubing by using the axial vibration of drilling tool,and solves the stick slip and sticking problem by using the high-frequency and low amplitude torsional impact.After consulting a large number of literature about compound impactor and summarizing the previous research results,this paper designs a new type of small-diameter compound impactor for the problems of pressure supporting,self-locking,stick slip and sticking in horizontal drilling of shale gas.The design of the drilling tool mainly uses the transplant combination,vibration and mechanical substitution principle in TRIZ innovation principle.The overall structure is composed of Φ 73 axial hydraulic oscillator and Φ 90 torsional impactor transplant.The hydraulic energy of the drilling fluid is converted into the mechanical energy of the drilling tool to break the rock,which produces periodic axial vibration and high frequency and low amplitude circumferential collision,so as to reduce horizontal drilling In the process,the friction of coiled tubing and the problem of bit sticking and sticking are solved.In this paper,the structure design and working principle of the compound impact speed-up drilling tool are described in detail,and the reversing working state of the torsional impact system is shown in the way of illustration.The size of the direct rotation actuator in the axial vibration system is optimized by MATLAB software.Based on the theory of impact impulse,the circumferential dimension of the hydraulic hammer is designed,and the motion model of the key parts in the torsional impact system is established.On this basis,the flow channel of the torsional impact system is simulated,and the pressure and velocity nephogram are obtained.According to the relationship between the axial and circumferential vibration frequency at the optimal rock breaking efficiency of the composite impactor,the inlet flow and the orifice size are determined.In order to verify the strength of the key parts,the hydraulic hammer was analyzed by using the transient dynamics,and the results showed that its strength met the design requirements.According to the motion characteristics of the compound percussive speed-up drilling tool,the vibration models of axial and circumferential directions are established respectively.Based on the structure and size of the drillingtool designed in this paper,the condition of periodic impact vibration of the torsional impact system is found.Then three kinds of vibration control technology are introduced.According to the structure of the drilling tool,the single impact vibration control technology is used to study the vibration control of the drilling tool.The relationship between the vibration amplitude and the mass of the vibrating body is obtained through the numerical simulation of the circumferential collision amplitude by MATLAB software.Based on the above research results,the working performance of the drilling tool has been improved to a certain extent,and the structure design of the small-diameter composite percussive speed-up drilling tool has been improved,which provides a certain theoretical basis for further research on the composite impactor.