Design Of Fluid Control Device For Particle Impact Drilling

Particle impact drilling technology which has changed the traditional way of cutting formation and improved energy efficiency is specially used to hard formation in deep well. However, the back flow of the drilling fluid directly affects the bit life in the drilling process. The particles of the fluid accumulate around the bit, which will damage the drill bit, reduce the service life of drill bit, and then increase the cost of drilling. So it is necessary to design a fluid control device for particle impact drilling.In this paper, started with drilling process principle and flow, Solid-liquid two-phase flow equations are set up in the drill string during drilling, and this will be the foundation for analysis of the pressure distribution within the drill string which provide data support for design and strength check of the device. Back flow property is researched which will provide theoretical support to the design of the device. Combining with the working principle of existing check valve, based on the design philosophy that the device is turned on and drilling fluid can pass through the fluid control device when the pump works, and when the pump stop working, the device automatically enters the closed state, so the fluid cannot pass through, design the fluid control device can work on condition of the ground mud pump device's open /close state.Then use softwares such as AutoCAD and Pro/ENGINEER Wildfire to design the structure of fluid control device, meanwhile, check the strength of important components of the device. Through checking the strength, we can see the design of important components is feasible. Through using Pro/ENGINEER Wildfire software sector (Mechanism) to do the mechanism motion simulation, achieve dynamic analysis and verification of assembly interference and motor coordination. Also prove that the fluid control device can work on condition of the ground mud pump device's open/close state is feasible. On the basis of the results of these studies, all the parts design of the system are completed, such as parts machining drawings, overall assembly drawings, and so on.