Emergency release device with tie-back function and method

An emergency relief and functional technology, applied in the direction of earthwork drilling, mining fluid, drilling equipment, etc., can solve the problems of low operation efficiency, complex control logic equipment, high carrying capacity of drilling operation ship, and high deck space requirements, so as to reduce the carrying capacity Capability and deck space requirements, flexible and convenient operation, and strong adaptability

Active Publication Date: 2020-12-29
CNOOC TIANJIN BRANCH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can effectively realize the release function, the control logic and the equipment involved are complicated, and the requirements for the carrying capacity and deck space of the drilling operation ship are relatively high, and the workload of the tie-back after release is increased, and the operation efficiency is low.

Method used

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  • Emergency release device with tie-back function and method
  • Emergency release device with tie-back function and method
  • Emergency release device with tie-back function and method

Examples

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Embodiment Construction

[0041] The present invention will be further described below in conjunction with the accompanying drawings, but the present invention is not limited to the following embodiments.

[0042] Such as figure 1 As shown, the emergency release device with tie-back function provided by the present invention includes: a workover riser 4 , an emergency release joint 1 , a power system 2 , a sealing joint 3 , and a wellhead connector 5 .

[0043] Wherein, the emergency release joint 1 includes an emergency release male head 101 and an emergency joint female head 102, the emergency release male head 101 is fixed on the upper workover riser connected to the operation ship, and the emergency release female head 102 is fixed on the lower part connected to the underwater wellhead On the workover riser, when the emergency release male 101 cooperates with the emergency release female 102, the internal communication between the upper workover riser and the lower workover riser is realized, and t...

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Abstract

The invention discloses an emergency release device with a tie-back function and a method. The emergency release well sealing device comprises an emergency release joint, a power system and a well sealing joint; the emergency release joint comprises an emergency release male head and an emergency release female head, the emergency release male head is connected with the power system through an upper power pipeline, and the well sealing joint is connected with the power system through a lower power pipeline; under an emergency release condition, an upper workover riser is lifted upwards in an over mode, the emergency release male head is separated from the emergency release female head, when the upper power pipeline is disconnected from the power system, power liquid is provided for the well sealing joint through the lower power pipeline, and the well sealing action is triggered. The emergency release device with the tie-back function and the method can be used for a conventional drilling workboat and can also be used for an engineering boat, are high in adaptability, flexible and convenient in operation, and can be widely applied to workover treatment of a deepwater oil and gas field adopting an underwater wellhead development mode.

Description

technical field [0001] The invention relates to an emergency release device and method with a tie-back function, and belongs to the technical field of workover in the underwater wellhead mode of offshore oil and gas fields. Background technique [0002] For oil and gas wells developed in the subsea wellhead mode, it is generally necessary to use a workover riser to establish a circulation channel between the floating drilling operation vessel and the subsea wellhead during the workover process. Due to the risk of positioning failure of the floating drilling operation vessel in emergencies such as typhoons and internal waves, the drilling operation vessel deviates from the safe operating range, and serious accidents such as breakage of the workover riser or damage to the underwater wellhead occur. An emergency release device is installed in the workover string to realize the emergency release of the workover riser and the wellhead, so as to ensure the safety of the workover r...

Claims

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Application Information

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IPC IPC(8): E21B17/06E21B43/013E21B33/038E21B7/12
CPCE21B17/06E21B43/013E21B33/038E21B7/12
Inventor 李中盛磊祥肖凯文许亮斌李朝玮刘健李梦博
Owner CNOOC TIANJIN BRANCH
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