Research On Casing Tool Slip And Sealant Cylinder For Top Drive

Casing operation is a key link in the process of drilling and completion operation, its operation quality directly affects the cementing quality, production efficiency and oil well life. Traditional casing tools exist shortcomings like low efficiency, great potential safety hazard and so on, While the top drive casing tool operate the casing, it can rotate and put the casing at the same time, and circulate mud at any time according to need, downing to the bottom of a well, safe and efficient. However, the research on the top drive casing tool bearing and seal technology has rare been reported in domestic and overseas, let alone the top drive casing tool manufacture is difficult and the production cost is high. To this end, this paper studied a top drive casing cylinder type tool and carried out in-depth study specific to slip and sealing system, laying a good foundation for the design of the top drive casing tools, concrete research content is as follows(1) Based on the domestic and overseas top drive casing tool investigation existing situation, the casing operation functional demand, operation process and working principle has been cleared,and based on Pro/E frame concept, the casing tools mechanical system structure design has been completed and three dimensional numerical model has also been established in this paper.(2) Based on elastic, plastic t and thin shell theory and applying ANSYS and MATLAB into the carrying capacity of slip research, the results show that the bearing capacity calculation results be safe based on thin shell theory and consistent with the finite element analysis results; The factors affect the slip bearing capacity, successively, slip length, friction coefficient, torque, thrust hydraulic system(3) Based on the elastic theory, the Hertz theory and experimental method to study the slip stress distribution and the contact stress of tooth, and based on response surface method, the slip tooth structure parameters are optimized. Results show that the maximum slip tooth tip stress and the farther from slip tooth tip, the stress and contact stress is smaller; Optimized slip tooth stress reduced 21%, effectively reduce the casing damage and slip tooth deformation. The results are consistent with experimental result.(4) Based on the analysis of the constitutive model of rubber, finite element materials evaluation function, combined with the stability evaluation, optimizing the reasonable strain energy function, and fitting for the constant coefficient of materials; Optimization function of rubber on uniaxial tension experiment is simulated, the simulation results are consistent with the experimental results(5) Based on response surface method (RSM) and the finite element method (FEM), the rubber tube sealing pressure and stress are analyzed and parameters optimized. Results show that the design of the rubber tube structure can satisfy the demands of circulating mud seal, the optimized sealing pressure increased by 3%, and the stress was reduced by 6%; at the same time, based on the VC developed glue tube sealing analysis special software, it laid a foundation for the glue tube series product research and development.