Journal of Southwest Petroleum University(Science & Technology Edition) ›› 2021, Vol. 43 ›› Issue (1): 157-166.DOI: 10.11885/j.issn.1674-5086.2018.08.01.01

• PETROLEUM MACHINERY AND OILFIELD CHEMISTRY • Previous Articles     Next Articles

Multi-objective Optimization Design of Push System for Microsphere Focusing Logging Tool

REN Tao1, FENG Bin1, SUN Wen1, ZHANG Chunlin2, TANG Daolin3   

  1. 1. School of Mechanical Engineering, Xi'an Shiyou University, Xi'an, Shaanxi 710065, China;
    2. Chengdu North Petroleum Exploration and Development Technology Company Limited, Chengdu, Sichuan 610051, China;
    3. Material and Equipment Department of Yanchang Oilfield Company Limited, Yan'an, Shaanxi 716000, China
  • Received:2018-08-01 Online:2021-02-10 Published:2021-01-23

Abstract: The optimum design method of the pushback system based on the speed, acceleration and driving angle of the main driving mechanism of the pushback system is presented. According to the actual working conditions, the velocity and acceleration at the center of the polar plate in the push system are selected as the parameters to evaluate the driving performance of the push system through the motion analysis of the push system. Based on the result that the mean square root of the velocity difference and acceleration difference between the expected parameters and the moving velocity difference at the point of the center of mass of the pushing plate and the minimum mean square root of the transmission angle difference of the main drive mechanism of the system, the constrained multi-objective optimization model of the push system is established. An improved complex algorithm for population search in genetic algorithm and the information exchange method between individuals are introduced into the complex algorithm to solve the constrained multi-objective optimization problem. A log pushing system with high approximation to expected value and reasonable mechanism parameters is obtained. Finally, the optimization results are compared with the original design of the microsphere focusing logging system for dynamic performance analysis to verify the correctness and effectiveness of the optimization method. The results show that the optimization effect is obvious and the stability of motion and the force transfer performance of the pushing plate are greatly improved.

Key words: microsphere focusing logging tool, push system, planar seven-bar mechanism, complex genetic algorithm, multiobjective optimization

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