Development Of Jib Type Pipe String Transfer Device For Workover Rig Operation

Workover operations are divided into major workovers and minor workovers.According to statistics,the most frequent workover operations in various oil fields are minor workover operations,accounting for 65%-75% of oilfield workover operations.In the process of minor repairs,the lifting and lowering of the tubing string has a large workload,the highest labor intensity,and poor safety.At present,most oilfields use manual operations to lift and lower the tubing string,with four people working together and taking turns to exchange.Aiming at the current status of tubing string operation,this paper studies and designs a new type of jib-type tubing string processing device for workover rig operations.The device is fully hydraulically driven,which can realize high-efficiency,semi-automatic pick-up and drop-off of pipe strings,long-term transportation and other actions,and its movable angle is 0°～90°.Different from the centralizing mechanism in the previous tubing string handling device,this device uses hydraulic manipulators to directly clamp the tubing string.The two sets of hydraulic manipulators adopt a parallelogram structure to achieve smoothness during the transfer process of the tubing string.It can meet the pipe pick-up requirements for both inclined well and vertical well workover operations,and ensure that the efficiency of pipe pick-up,tripping and alignment becomes more accurate when the workover rig is in operation.This paper mainly completes the scheme design of the overall mechanical structure and hydraulic system of the swivel type pipe string treatment device;establishes the three-dimensional model of the pipe string treatment device;carries out the strength analysis of the corresponding main bearing components;The selection parameters of each hydraulic cylinder are calculated,the hydraulic pump is selected,and the hydraulic system design of the pipe string processing device is completed;The kinematics and dynamics models are established for the pipe arm mechanism,the pipe string preventing mechanism and the pipe string positioning mechanism,and the generalized coordinates of the system are established through the kinematic pair connection between the components to complete the kinematic analysis of the mechanism;using the ADAMS software The generalized coordinate vector is established for the dynamic model of the pipe string processing device mechanism using the dynamic theory of The driving force equation of each hydraulic cylinder is obtained,and the dynamic analysis of the mechanism is completed.The ADAMS software is used to simulate,analyze and compare the two conditions of the device load and no-load during the process of the pipe string processing device from 0° to 90°,and obtain the elongation of the grab arm,the hydraulic cylinder of the pipe feed arm,the driving force,and the support arm.Rotation angular velocity and other curves,and analyze and compare the respective curves;simulate and analyze the pipe feeding mechanism in the device;simulate and analyze the contact collision between the oil pipe and the device when the pipe is arranged in the pipe arrangement,and obtain the contact collision force and The torque curve and the contact collision analysis of the oil pipes with different pipe diameters to the pipe arrangement are carried out,which provides a theoretical basis for the in-plant type test of the device.The rotary arm type string processing device provides a reference for users,designers and managers in related fields.