Structure Optimization And System Simulation Of Workover Blowout Preventer

Along with the development of oil and gas production development into the mid and late, the well itself fails, well string structural damage and oil equipment failure resulting in production wells can not normal production. so the well need well workover operating.Workover BOP operates at the wellhead and does not require drilling platform. It used for the preventing blowout between tubing and casing annulus or in tubing. So Workover BOP has well prospects because of its compact structure, low mass and easy to transport.Based on the use of features, the article researched on the structure and hydraulic systems of Workover BOP, analyzed and optimized the blowout preventer housing structure.Checked the strength of the housing by the finite element method, the strength of housing meets the requirements, the weight greatly reduced which saves the cost and enhanced the stability of the well head of the workover operating. The side door which used for sealing gate chamber and cylinder. is a key component of the BOP and its sealing performance has a direct impact on the performance of the BOP. The article researched on the side door seal theory,concluded the cause of seal failure and optimized the structure. Based on the FEA, the result showed that the side door optimized sealing performance is more reliable, and solved the problem of bolt fracture. The article checked the strength of screw and piston rod by FEA, the result showed the structure is reasonable.Based on the analysis of the Workover BOP operation, the article optimized the traditional BOP hydraulic system. The article analysised the simulation of hydraulic system by the AMESim, the result showed that the action of clamping cylinder and Shear cylinder each takes less than 5s. Completed the whole action takes less than 10 s, the action is fast. The system pressure is still some margin, guaranteed the reliability of the operation.