Modular Design And Simulation Research Of Petroleum-Drawworks

Drawworks is one of the main transmission components of petroleum machinery; its security and stability largely affect the safety of the whole petroleum machinery system. At the present time, the design of drawworks is still based on the traditional design ideas, which can not satisfy the requirements of professional production and fast reaction to market. The quality improvements of products during large scale production and the development of drawworks manufacture in China are limited.This dissertation mainly focuses on the modular design method and design reliability of petroleum-drawworks. Based on the predecessors' researches, knowledge of modern mathematics, mechanics, computer and structure reliability are used forthe modular design and simulation technology research of petroleum-Drawworks by academic deduction, numerical simulation, examples analysis and matched software development.Firstly, the structure components and working theories were studied. Main design theories such as general parameters design, drum design, braking system design and transmission system design and calculation model were analyzed. These studies provide theories support for modular design.Secondly, petroleum-drawworks modular design system was developed through adopting VB computer language. The drawworks of drilling rig, workover rig and swabbing truck were taken as the basic products of petroleum-drawworks. According to the technology requirements and combined with fieldwork, the drawworks design was divide into three main modules (drum, braking system and transmission system) and two assistant modules (general parameters design and other parts design) on the basis of modular design theory.Thirdly, the finite element technique was adopted to analyze the main drum and the bailing drum of 650HP workover rig. For the main drum, according to different position of tripping and wire line, the drum surface load was divided into 6 operating conditions for calculatation and the stress conditions of key parts in different operating conditions were studied so as to obtain improvement measures. For bailing drum, the numbers of banding layer for different wire lines and stress conditions of key parts with different wire lines pull were analyzed to get matched maximum Mises stress fitting formula. At the same time, according to reliability design theory, the reliability of the main parts of the drawworks in different operating conditions were analyzed, in consideration of the randomness of drawworks' design dimension, outside load and material behavior. Then, the drawworks was taken as a cascade system and the reliability of the system was analyzed.Finally, the structure and working principle of casing swage connection were studied and analyzed in details. The theory deduction was done for mechanical model of casing swage, and then the casing swage connection was applied in a drawworks of drilling rig, which proved that the application of casing swage connection in petroleum-drawworks was workable.