Tool Introduction:

The square expansion nipple is used to provide a stretch length in the string to compensate for the floating of the drilling vessel, so that the WOB not below the square expansion nipple can be kept stable, and it can also be used to adjust the change of tubing length caused by temperature or pressure changes in the completion pipe injection. It can maintain the pressure inside the oil pipe and ensure its safe expansion and contraction. The telescopic tube can transmit a large torque, and depending on the specific situation, it can be placed on the upper part of the packer or in the middle of the two-stage packer.

The bidirectional combination sealing mechanism ensures reliable sealing and can be set to the initial opening pressure by selecting the number of shear pins.

Structural features:

① The structural design of the square axis has high strength and can withstand large torque;

② Can provide 500mm or 1000mm free expansion stroke;

③ The V-shaped sealing component design ensures reliable sealing performance.

Operation:

During the process of going down the well, the shear pin ensures that the square expansion joint is in a contracted state; After the tool is lowered to the predetermined position, pressure is applied inside the pipe column, and the shear pin is cut off. During the subsequent acid pressing operation, the tool is in a free expansion and contraction state. The guide axis of the square expansion short joint and the outer cylinder string have independent relative motion in the axial direction, which can ensure that the outer cylinder string is in motion, while the central axis string remains relatively stationary to compensate for the changes in the stroke of the pipe column at the lower end of the tool caused by external factors.

Technical parameters: