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Deepwater oil and gas field underwater facility and hydrate unblocking method thereof

A technology for oil and gas fields and hydrates, which is applied in earthwork drilling, cleaning equipment, and production fluids, etc. It can solve the problems of easy blockage of hydrates and achieve the effect of simple operation

Active Publication Date: 2020-06-16
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for unblocking hydrates in underwater facilities of deep-water oil and gas fields, so as to solve the problem that hydrates in underwater production facilities of offshore oil and gas fields are easy to block

Method used

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  • Deepwater oil and gas field underwater facility and hydrate unblocking method thereof
  • Deepwater oil and gas field underwater facility and hydrate unblocking method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Embodiment 1 provides a deep-water oil and gas field underwater facility in a single-pipe tie-back production mode, and its structure will be described in detail below.

[0041] refer to figure 1 , deepwater oil and gas field underwater facilities act on the first subsea well 11 and the second subsea well 15 in the deep sea, including a production platform 1 and a production manifold 9, when the production pipe system only includes the first production riser 7 and the first When the submarine pipeline is 8 and the production platform 1 extends into the sea through the first production riser 7, and the first production riser 7 is connected to the production manifold 9 through the first submarine pipeline 8 to form a single-pipe tie-back production mode, at this time the production The manifold 9 communicates with the first subsea well 11 through the first subsea well jumper 12 , and the production manifold 9 communicates with the second subsea well 15 through the second ...

Embodiment 2

[0046] Embodiment 2 provides a deep-water oil and gas field underwater facility in a double-pipe tie-back production mode. On the basis of Embodiment 1, the production pipe system is improved. The improvements are as follows:

[0047] refer to figure 2, when the production pipe system includes the first production riser 7, the second production riser 16, the first subsea pipeline 8 and the second subsea pipeline 17, a double-pipe tie-back production mode is formed, and the double-pipe tie-back production mode also includes a Production platform 1 and a production manifold 9, the production platform 1 extends into the sea through the first production riser 7 and the second production riser 16 respectively, the first production riser 7 and the second production riser 16 pass through the first production riser 16 respectively The subsea pipeline 8 and the second subsea pipeline 17 communicate to a production manifold 9 .

[0048] The structure of the cable tube and its connecti...

Embodiment 3

[0050] Embodiment 3 provides a method for unplugging hydrates in underwater facilities of deep-water oil and gas fields, using the underwater facilities of deep-water oil and gas fields in Embodiment 1, and the method for unplugging includes the following steps:

[0051] Step S1: Determine the location and type of blockage.

[0052] If the hydrate blockage is located in the production riser or subsea pipeline, it is determined to be the type of hydrate blockage in the production manifold;

[0053] If the hydrate blockage is located at the subsea wellhead or at the jumper, it is determined to be the type of hydrate blockage near the subsea well.

[0054] Step S2: Implement depressurization on both sides according to the blockage type.

[0055] For the type of hydrate blockage in the production manifold in the single-pipe tie-back production mode, the depressurization scheme in the subsea facilities of deepwater oil and gas fields includes the following steps:

[0056] Shuttin...

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Abstract

The invention discloses a deepwater oil and gas field underwater facility and a hydrate unblocking method thereof. The underwater facility comprises a production platform, a production manifold, a production pipe system and an auxiliary pipeline system, and the unblocking method comprises the steps of judging a blocking position and type, implementing two-side depressurization according to the blocking type and the like. According to the deepwater oil and gas field underwater facility and the hydrate unblocking method thereof, hydrate blocking in an underwater wellhead, a jumper pipe, a production vertical pipe and a submarine pipeline can be effectively removed. According to the deepwater oil and gas field underwater facility and the hydrate unblocking method thereof, aiming at differentblocking positions and types, pressure of the interior of the underwater facility is reduced by utilizing a depressurization method, and a method for two-side depressurization of hydrate blocking points is realized, so that the problem of the hydrate blocking in the underwater wellhead, the jumper pipe, the production vertical pipe and the submarine pipeline can be effectively solved, and the method is simple to operate, economical and effective, and is of great significance to safe operation of a deepwater oil and gas field.

Description

technical field [0001] The invention relates to the technical field of petrochemical industry, in particular to an underwater facility of a deep-water oil and gas field and a hydrate unplugging method thereof. Background technique [0002] Natural gas hydrate is a clathrate compound formed by the interaction between natural gas and water under low temperature and high pressure conditions. With the development of deep water oil and gas fields, the economical and efficient long-distance transportation of untreated oil, gas and water multiphase crude oil has become a deep water Key technologies for oil and gas field development. The high-pressure and low-temperature environment in deep-water oil and gas fields makes it easy for underwater facilities such as jumpers, subsea pipelines, and manifolds to generate hydrates, which is often accompanied by the risk of blockage. The current hydrate deblocking of underwater production facilities generally uses the injection of hydrate i...

Claims

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Application Information

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IPC IPC(8): E21B43/01E21B43/30E21B37/00
CPCE21B43/01E21B43/30E21B37/00
Inventor 姚海元李清平朱海山崔月红王军程兵
Owner CHINA NAT OFFSHORE OIL CORP
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