DEJ-A expansion joint is a key matching tool for downhole operation string, which is used to adjust the change of tubing length caused by temperature or pressure change in the string, so as to avoid the danger caused by excessive axial load change. It can be used in conjunction with mechanical or hydraulic packers and is widely used for various production measures such as fracturing and acidification. It is also widely used for water and gas injection. The expansion joint can maintain the pressure inside the oil pipe and ensure its safe expansion and contraction. The DEJ-A type expansion joint can transmit torque, and depending on the specific situation, the expansion joint can be placed on the upper part of the packer or in the middle of the two-stage packer.

Features/Advantages

The outer cylinder and the central tube rely on keys for torque transmission, and torque can be transmitted at any position

Long sealing components with reliable sealing and large expansion and contraction stroke (stroke can be customized)

Adjustable opening pin combination, shear force can be adjusted within the required range

The regular working pressure is 70MPa (10000Psi), and the maximum working pressure is 105 MPa

Normal working temperature resistance is 177 ℃, with a maximum working temperature of 204 ℃