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The product name:PIPE STRING PERISTALTIC COMPENSATOR

1.                      Application

It can compensate for the elongating and shortening of the separated layer water injection string caused by the change of water injection pressure due to repeated water injecting and stopping, thereby effectively preventing the packer from being damaged by string creeping and extend the life of the packer.

2.                      Structure Principle

The device is attached to the first stage packer. When the water well is filled with water, the water injection pipe column is elongated and creeped under the pressure difference. At this time, the water injection pressure enters from the link hole of the center tube to generate an upward thrust, which offsets the downward force of the lower pipe string due to the pressure.

The lower column does not move under the frictional force of the packer and the casing, and the elongated portion of the column above the compensator extends into the compensator. When water injecting of the water injection well is stopped, the pressure difference disappears; the column under the compensator does not move because of the frictional force between the packer and the casing. The column above the compensator is shortened, and the shortened length is the length that stick into the compensator. Hence the column under the compensator does not move, which prevent the column from creeping.

3. Technical Parameters

Maximum OD: Φ112mm;

Applicable casing ID: Φ121-124mm;

Min ID of the center tube: Φ60mm;

Total length: 1772mm;

Compensation stroke: 600mm;

Sealing pressure: 25MPa;

Working temperature: <120 ° C

Upper joint thread: 2 7/8 TBG BOX

The lower joint thread: 2 7/8 TBG PIN

4. Ground Assembly and Inspection Standards

l  The sealing ring should be intact, the size should meet the requirements, and there should be no tightening during installation.

l  Thread oil should be applied to all the thread connection joint before installation.

l  After assembly, it must be tested on the ground to make sure the movement of each part is flexible and the sealing performance is reliable.

l  After assembly, qualified inspection form should be filled.

5. Attention

l  It should be connected to the first stage packer.

l  It is used in water injection wells with interlayer pressure difference less than 4 MPa.

l  Lifting and lowering drill must be smooth and slow, violent lifting and releasing during construction is forbidden.

l  The downhole oil pipe must be cleaned, and damaged oil pipe must be replaced. Make sure that all used oil pipe can reach the rated pressure resistance.

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