Study On Various Work Condition Operating Rules And Control Strategy Of Horizontal Directional Driller

HDD(Horizontal Directional Drilling)is a new type of construction equipment combining oil industry directional drilling technology and traditional pipeline construction methods, as one of the most dynamic construction techniques, it has many advantages such as accuracy-oriented, environmentally-friendly, high efficiency. The use of Horizontal Directional Drilling technology across the river can save a large number of human and material resources, improve the work efficiency, reduce the comprehensive cost, so there are broad prospects for the development.When HDD is working, the drill suffers complex loads, taking into account the drill pipe works in the soil,and we can not see the status of its work, so it is essential to simulate and analysis the drill pipe forces for the latter to improve and optimize the structure and this technology. "Energy saving" has become the world's industrial development in the direction of an important, major companies regard the "energy-saving technology" as a key development goal of science and technology to improve the overall performance of their products and competitiveness in the world market. In this paper, taking into account the horizontal directional drilling at home and abroad and the development of the status quo, this paper will do some work on the operating rules and various work condition control strategy, major works are as follows:1 Drill assembly(combined drill pipe and drill bit) is an important component and it is the key to the whole part of the operating system. This article describes the composition of the operating system HDD, with a focus on the structure of the host system. Using CATIA to make 3D model of the bit, discussed the principle of beveled hole,get the mechanical equationon and analysis its impact on the drilling trajectory.2 Based on three-moment principles, under the premise of some reasonable assumptions,using the vertical and horizontal bending methods to set up the mechanical equation of drill pipe. According to the projections of the mathematical model, using Ansys to solve the results of finite element simulation of static load and summary the working rules of drilling at the time.3 HDD often works in a variety of different conditions, combined with the current situation of division of the status at home and abroad,make adivisions of labor on the status of HDD, in the basis of power matching,design four power modes for different stage. Considering the operating rules,this paper research on the various work condition control strategy, use the module of Simulink in Matlab to analysis simulation of the system.Through the research and analysis above-mentioned, we can draw the following major conclusions:1 After the horizontal directional drilling stem with connections deforms restricted by the hole under the action of axial stress,the maximum stress is located at the joint. With the increasing of the drilling stem connection diameter,the maximum bending stress in the drilling stem and the vertical deformation of the drilling stem will decrease accordingly. And the critical load of initial buckling of the drilling stem with connection is bigger than the one without connection. When the drilling stem connection diameter increases, the critical stress of initial buckling will increase too,which indicates that buckling can be restricted and frictional resistance will decrease. So the drilling effect will be raised and the life of the drilling stem will be prolonged if the connection diameter increases..2 The Ansys simulation results show that maximum stress of drill pipe is in the scope of bend,and the working rules of drilling can be served as a basis for the various work condition control.3 In the basis of the frontal estimated mechanical model, through simulation analysis shows that after the simulation of stability and dynamic response characteristics for various work condition control system, we can get relatively satisfied performance indicators,this system has good practicality,it can make engine rapidly achieve a stable speed, reduce the speed fluctuation, played a good effect on energy-saving to some extent,and it is useful for HDD to improve its power and economy.