How to solve the low efficiency of the shackle on the tubing during the workover operation Easy to clamp the pipe body deformation?

In the process of oil field workover, the up shackle of the string is the key link in the workover operation. There are two main types of upper shackle equipment in the operation site, one is the traditional manual operation suspension workover power used in large area. Hydraulic pliers, another type of iron driller for automatic test application of upper shackle.

When manually operated hydraulic pliers shackle the drill pipe during workover, the torque of drill pipe thread becomes larger due to some special workover techniques, which may lead to the problem that the hydraulic pliers cannot unhook the drill pipe due to insufficient output torque.

Meanwhile, manual operation of hydraulic pliers is of great labor intensity and great risk of personal injury. In recent years, drilling automation equipment has been introduced into the workover operation of oil field to carry out field tests. However, due to its structure and function for the development of drill pipe thread, there are some problems such as low efficiency and easy deformation of pipe body when the tubing is shackled during workover operation.

To address the issues like great labor intensity, harsh operation environment and high operation risk during tubing string tripping due to low level of mechanization, the tubing centralizing device has been designed and developed. The device consists of wellhead bracket, the hydraulic cylinder for centralizing, guide conical barrel, assisting centralizing arm, main centralizing arm and mechanical handler assembly.

The device driven by hydraulic cylinder could reduce the swings of the lifting tubing by tubing centralizing. Precise tubing centralizing ensures the smooth of the tubing connection alignment and makeup. Static stress analysis results show that the designed device could meet the centralizing and alignment requirement of maximum ø114.3 mm (4-1/2 in) tubing.

Field application results showed that the device could well coordinate the wellhead device and tubing transmitting equipment, resulting in mechanized tubing tripping workover operation without human intervention, meeting the requirements for field application.

100-Hydraulic clamp body  101-Automatic shift hydraulic pliers master pliers  102-Suspension floating bracket assembly  112-Floating bracket housing  122-First floating sleeve 132-Second floating sleeve  142-Floating elastic part   152-Bearing    162-Roller   172-Connecting shaft   182-Elongated hole   103-Torque detecting device 113-Pressure sensor    123-Deflection plate   600-Punching device    201-First hydraulic drive device    202-Second hydraulic drive device   300-Clamping main pliers301-Master clamp housing   302-First master clamp hydraulic cylinder  303-Second master clamp hydraulic cylinder   304-Ring guide   305-First mounting base   306-Second mounting base 400-Clamping back pliers  401-Back clamp housing  402-Ring guide   403-First master clamp hydraulic cylinder   404-Second master clamp hydraulic cylinder  405-Annular support ring 406-Punching anti tipping strip   407-Heavy-load spring   500-Dismantling the channel   700-Regulating device   701-Rotary device  702-Lifting device  703-Telescopic arm assembly800-Socket base  900-Floating centering reset device


The tubing centralizing device for automatic workover operations is composed of a main centralizing arm, an auxiliary centralizing arm, a hydraulic cylinder, a centralizing device, and a centralizing barrel, as shown in Figure 1. The main centralizing arm is hinged with the wellhead support, and the upper end of the main centralizing arm is equipped with a mechanical handrail, which can be moved back and forth with the hydraulic cylinder of the handrail. The auxiliary centralizing arm is a four-bar linkage mechanism, the main rod is hinged with the main centralizing arm, the lower side is hinged with the bracket, and the four-bar linkage mechanism swings with the main centralizing arm. The top of the guide cone is in the shape of a bell mouth, which is fixed on the bottom plate on the support rail, and the hydraulic clamp is aligned with the center of the guide cone.

In the process of lowering the tubing, the guiding cone further limits the freedom of the tubing and enables precise centering of the tubing.

The product is an automatic hydraulic clamp with punching function, which relates to the technical field of oilfield workover tools, including the main body of hydraulic clamp and punching device; The punching device is connected with the main body of the hydraulic pliers. Both the main body of the hydraulic pliers and the punching device can be moved to the pipe string.

The punching device can hook or shackle the connecting button of the pipe string through the removal channel. The main body of the hydraulic clamp is provided with a clamp mouth, which can hold the pipe string, so as to offset the rotation of the pipe string completed by the buckle through the main body of the hydraulic clamp;

Through button punching device can achieve high torque on the shackle or on clasp, small torque on the shackle is string through hydraulic clamp body rotation, through the hydraulic clamp body and button punching device to form an organic whole, to solve the existing in the existing technology of hydraulic clamp buckle on drill pipe shackle or occur due to inadequate torque to shackle or buckle, as well as the existing iron roughneck shack on the tubing, low efficiency, easy to clip the tube deformation of technical problems.

The mechanized workover tubing centering device uses a hydraulic cylinder to drive a centering arm and an auxiliary centering arm to realize the centering operation of the tubing. The structure is simple and the operation is convenient. Cooperating with the wellhead equipment and the tubing conveying device, it can realize the mechanization of the workover operation.

The field application results show that the device can meet the design requirements, and can quickly complete the tubing straightening, centering, and righting arm transfer procedures, effectively improving the efficiency of mechanized workover operations.

The application of this device does not require manual transfer and centering of the tubing, which can replace wellhead operations, significantly reduces the labor cost of the operation team, and greatly enhances the safety of the operation site. Therefore, the device has a good promotion and application prospect.