The Research On Back-up Tong Of Hydraulic Top Drive System

Along with the increase of the drilling depth of the continental scientific drilling, the mechanical and automation degree of deep drilling equipment and auxiliary devices is more and more high. Top drive drilling device is an important equipment of land deep scientific drilling rig, be able to drive drill string rotation at any height directly, and down the guide rail which is installed on derrick to complete the rotary drilling of the drill string, upward lifting to complete the operation of drill or drill down, etc. Avoid or deal with the accidents in time effectively, increase drilling efficiency and job security greatly. Base on the project which is “Experimental Research of Deep Exploration Key Instrumentation”, design a new type of high-speed large-torque hydraulic top drive product which is suitable for deep continental scientific drilling.This paper focuses on back-up tong device which is a key component of top drive system, The main function is to complete clamping in the process of drilling. Because of the poor working environment and high work intensity, equipment failure rate is high, it has a practical significance to improve the working reliability and structure of back-up tong. This paper mainly studies on theoretical analysis, computer simulation, experimental testing method of back-up device, specific contents are summarized as follows:1. A large collection of literature about domestic and international of top drive and back-ups, start from the structure of top drive, in-depth understanding of operation process and working principle of back-up tong. determine operation scheme and design parameters. Analyze the performance parameters of back-up device, provide reference for dynamic analysis.2. Use ADAMS to do dynamics simulation for the clamping mechanism, obtain performance parameters curves and analyze dynamic characteristics, compare the simulation results and theoretical analysis, verify the correctness of the theoretical calculation and practical rationality of design scheme, at the same time provide theoretical basis for optimization design and finite element analysis.3. Take orthogonal optimization method as guidance to optimize main cross-sectional parameters of jaw like angle, height, spacing, finally find the best parameters combination. Under the premise of guaranteeing action reliability to prolong service life, simplify back-up model reasonably and stress analysis, provide theoretical support for the optimization of jaws.4. Use ANSYS Workbench to do finite element statics analysis for the key mechanical component of clamping mechanism--jaw. On the one hand, verify the accuracy of scheme selection; On the other hand, observe stress and deformation situation to check its strength, prove the reliability and safety of clamping action.5. Through the experimental study, test related working performance of back-up tong, check whether the practicality and functionality can meet the design and use requirements, provide technical guidance for improvement and maintenance of product.High degree of automation and intellectualization of oil drilling equipment to be more widely used in modern scientific drilling. To a certain extent, the research methods and results of this paper can provide some reference and technical support for further update of back-up tong product.