| Because Full-hydraulic power water well rig has so many advantages, such as high degree of mechanization, drilling well with many ways, good mobility, etc. It has become a major well drilling equipment in foreign countries. In China, as the country has stepped up to find water and the great coal-bed methane development, Full-hydraulic power water well rig will be one of the equipments which cannot be shortage in well drilling production. This paper has designed the system of top drive of SDC1000 well rig in traditional methods, and then created three-dimensional finite element model of kickstand which endured the largest force in the top drive, ansysed the stress and displacement distribution laws of the kickstand under static and dynamic load in variety conditions. Optimized the design of kickstand based on the maximum stress. All of these can provide reliable theoretical base for design and optimize the kickstand of top drive , it has important theoretical meaning and application value.The main research contents and results of this paper as follows:(1) Designed the system of top drive of SDC1000 well rig in traditional methods, and designed the hydraulic system . Then selected parts of the hydraulic system.(2) Ansysed the kickstand of top drive which has been designed under static and dynamic load, and educed the stress and displacement distribution laws. The main calculation results are: The stress concentrate areas is around the big hole in fixing board, the lagest stress and displacement occurred in front of big hole in fixing board; The stress and displacement occurred in slideway and become smaller in back board; The stress and displacement of the kickstand are affected mostly by pull which offered by chains, and affected little by torsional; Under the dynamic load, the kickstand has inertial force, but because the kickstand olny endure weighe of drill pipe and unendure resistance of block, the stress and displacement are declined.(3) The dynamic parameters of frame such as previous ten natural frequencies and corresponding modes are obtained through modal analyzing the frame of high speed foreging hydraulic machine.The simulating results indicate: The frame has not only fore and after ,up-down and left-right bending vibration, but also twisting vibration. These vibrations will affect the strength and stiffness of the frame, make slideway of top drive wear and tear increasing, and affect the precision of drilling. The whole stiffness and quantity of the frame are distributed with equalization, and these are no weak place and surplus location on the frame. The dynamic behaviors of the frame are well; The smallest frequency(216.32Hz) of frame is larger than slew frequency(Hz) of motor; What's more, it is larger than the frequency of 20Hz, so the design requirement of decreasing noise pollution is satisfied.(4) Based on ansys of staic and dynamic load, ensure that the maximal stress(258Mpa) and displacement(1.27mm) occurred when kickstand is pulled by chains. The maximal stress is much more smaller than yield limit of the material. The top drive is safety and dependable.(5) Optimized the shape of kickstand based on the maximum stress, the result indicate that: The design of the frame is reasonable before it is optimized, there are little excrescent material. After optimized, the weight of the frame reduced 6%, and the stress and displacement also descended.The synthesis above work, the paper design the top drive by traditional method and then utilization modern design, the anslysis method, done the static,dynamic and modal anasysis of the kickstand, validated the rationality and safety of the design, and optimized the frame base on the formerly design. These work have important meanings for designing and rebuilding top drives, and to the whole well rig design and optimize also have referenced significance. |
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