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Deepwater oil-gas field light well repairing device and method

A technology for oil and gas fields and workovers, applied in drilling equipment, earthmoving, wellbore/well components, etc., can solve the problem of high workover costs, reduce operating costs, reduce operational safety risks, and improve workover efficiency.

Active Publication Date: 2018-01-09
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The workover operations of conventional subsea production systems generally require the mobilization of semi-submersible drilling platforms or drilling ships, and the workover costs are relatively high

Method used

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  • Deepwater oil-gas field light well repairing device and method
  • Deepwater oil-gas field light well repairing device and method
  • Deepwater oil-gas field light well repairing device and method

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Embodiment Construction

[0034] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0035] Such as figure 1 and figure 2 As shown, a light workover device 100 for deep water oil and gas fields provided by the present invention includes a drill pipe 1, a subsea workover assembly 2 and a water workover assembly 3, and the upper end of the drill pipe 1 passes through the water workover assembly 3 It is connected with the crane 300 on the engineering ship 200 (or drilling platform or drilling ship), the crane 300 should have tension and heave compensation functions, and is used to control the lifting and lowering of the light workover device 100 in deep water oil and gas fields; The well assembly 2 is connected to the lower end of the drill pipe 1, and the subsea workover assembly 2 is lifted or lowered through the drill pipe 1. Among them, the subsea workover assembly 2 includes a safety joint 21, a blowout preventer 22, a fully-seal...

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Abstract

The invention relates to a deepwater oil-gas field light well repairing device and method. The deepwater oil-gas field light well repairing device comprises an overwater well repairing assembly, a drill pipe and an underwater well repairing assembly, wherein the overwater well repairing assembly can be connected with a crane on an engineering ship, the drill pipe is connected with the overwater well repairing assembly, and the underwater well repairing assembly is connected with the lower end of the drill pipe. The crane has the tension and heave compensation functions, and the underwater wellrepairing assembly comprises a safety joint, a blowout prevention valve, a whole-seal cutter ram blowout preventer, a stress joint, a tie back device and a guiding short circuit which are sequentially connected from top to bottom, wherein the guiding short circuit is arranged in the stress joint; and the underwater well repairing assembly is connected with the lower end of the drill pipe throughthe safety joint, and the tie back device is used for being connected with an underwater Christmas tree. According to the deepwater oil-gas field light well repairing device and method, the well repairing operation of a deepwater oil-gas field can be conducted by adopting the engineering ship, a large-size floating type well drilling platform does not need to be used, the operating cost can be greatly reduced, the well repairing efficiency is improved, and the deepwater oil-gas field light well repairing device and method are suitable for the well repairing operation of an underwater production system of an immovable string.

Description

technical field [0001] The invention belongs to the technical field of underwater workover in offshore oil and gas fields, and in particular relates to a light workover device and method for deep water oil and gas fields. Background technique [0002] The deep-water oil and gas fields adopting the underwater production system development mode can avoid the construction of expensive offshore oil (gas) production platforms, thereby saving a lot of construction investment. When the oil and gas field enters the middle and late stage of development, with the increase of recovery and the decrease of formation pressure, various production problems will occur in oil and gas wells. Therefore, it is necessary to maintain and repair oil and gas wells during the production process, and carry out various injection, Workover operations such as production stimulation. The workover operation of the conventional subsea production system needs to connect the riser first, and connect the subs...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B29/00E21B29/12E21B19/00
Inventor 许亮斌肖凯文周建良李清平王宇
Owner CHINA NAT OFFSHORE OIL CORP
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