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Multifunctional pipe string lifting device

A multi-functional, pipe-string technology that can be used in wellbore/well components, earth-moving drilling, etc., to solve problems such as well flushing obstacles

Inactive Publication Date: 2017-10-17
CNOOC ENERGY TECH & SERVICES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, the combined use of the insert seal and the sealing cylinder also blocks the well flushing circulation channel between the oil casing annulus and the tubing, setting obstacles to the well flushing of this type of layered water injection well.

Method used

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  • Multifunctional pipe string lifting device
  • Multifunctional pipe string lifting device
  • Multifunctional pipe string lifting device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0040] The present invention will be further described below in conjunction with the accompanying drawings.

[0041] The multifunctional pipe string lifting device of the present invention is composed of a tie-back module, a torsion-bearing module, a locking module and a lifting module connected to each other.

[0042] The tie-back module includes an upper joint 1, the lower part of the upper joint 1 is connected with a tie-back mandrel 2 through a screw, and the outside of the lower part of the tie-back mandrel 2 is connected with a tie-back joint 5 through a thread. A through hole is arranged in the middle part of the side wall of the joint 5, and a plug 4 is arranged in the through hole through a threaded connection. The inner side of the lower part of the tie-back joint 5 is connected with a suspension tube 6 through a screw. The upper and lower ends of the tie-back joint 5 can also be provided with stabilizing nails, which are fixedly connected with the tie-back working ...

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Abstract

The invention discloses a multifunctional string lifting appliance, comprising a tie-back module, a torque-bearing module, a locking module and a lifting module connected with one another. The multifunctional string lifting appliance can apply hydraulic pressure on the ground to lift a downhole string at the premise of not moving a wellhead, the ground applied hydraulic pressure enables the downhole string to descend, torque is transmitted in the whole course, an elongation state is locked during tripping-in, and the ground applied hydraulic pressure is unlocked after the string is descended in place. The multifunctional string lifting appliance is applicable to clean-up of injection wells.

Description

technical field [0001] The invention relates to a supporting technology for lifting the downhole production pipe string of a water injection well under the premise of not moving the wellhead, in particular to a multifunctional pipe string lifting device for lifting the downhole pipe string by applying hydraulic pressure on the ground. Background technique [0002] Washing the well through the water injection well can remove or alleviate the water pollution and blockage near the bottom of the well, thereby restoring the water absorption capacity of the formation and ensuring normal water injection and testing. The water injection well needs to be cleaned under the following conditions: (1) The injection is stopped for more than 24 hours; (2) The quality of the injected water is unqualified; (3) Under the same working condition, the water injection volume drops by more than 15%; (4) According to the regulations Well washing cycle; (5) Before and after deployment. [0003] For...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B23/00
Inventor 徐国雄刘华伟张伦玮宁永庚刘闯周海军
Owner CNOOC ENERGY TECH & SERVICES
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