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Marine hydrate exploitation and reinjection system and method

A hydrate and marine technology, applied in the fields of fluid production, earthwork drilling, wellbore/well components, etc., can solve problems such as low energy efficiency, and achieve the effects of increasing gas production, promoting decomposition, and improving production efficiency

Pending Publication Date: 2022-04-12
CHINA UNIV OF PETROLEUM (BEIJING) +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 marine hydrate mining and reinjection system and method for solving the problem of low overall energy efficiency in the mining process

Method used

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  • Marine hydrate exploitation and reinjection system and method
  • Marine hydrate exploitation and reinjection system and method
  • Marine hydrate exploitation and reinjection system and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Embodiment 1: A production well and a reinjection well form a production reinjection well group

[0038] Embodiment 1 provides a marine hydrate exploitation and reinjection system, the structure of which will be described in detail below with reference to the accompanying drawings.

[0039] refer to figure 1 , the marine hydrate production and reinjection system includes a production reinjection well group 6, a gas-liquid separator 2, a subsea production pipe 41, a natural gas delivery pipe 42 and a subsea reinjection pipe 43, each production reinjection well group 6 Including a production well 1 and a reinjection well 3,

[0040] Wherein, the production well 1 and the reinjection well 3 are both arranged in the natural gas hydrate reservoir 200 on the seabed, and the gas-liquid separator 2 is arranged on the seabed near the production well 1 and the reinjection well 3;

[0041]The gas-liquid separator 2 is provided with a gas-liquid mixture inlet, a gas outlet and a ...

Embodiment 2

[0053] Embodiment 2: Marine hydrate production and reinjection method based on the structure of Embodiment 1

[0054] Embodiment 2 provides a method of marine hydrate exploitation and reinjection, using the marine hydrate exploitation and reinjection system provided in Embodiment 1, the method includes the following steps:

[0055] The production well 1 exploits the marine hydrate in the natural gas hydrate reservoir 200, and the marine hydrate decomposes to produce gas-liquid mixed fluid;

[0056] The gas-liquid mixed fluid flows through the production pipe 11 to the wellhead 13 of the production well, flows out from the wellhead 13 of the production well into the subsea production pipe 41, and enters the gas-liquid mixture inlet of the gas-liquid separator 2 through the subsea production pipe 41;

[0057] The gas-liquid separator 2 separates the gas-liquid mixed fluid into gas and liquid;

[0058] The separated gas flows out from the gas outlet of the gas-liquid separator 2...

Embodiment 3

[0060] Example 3: Four production wells and one reinjection well form a five-point well pattern for production and reinjection

[0061] Embodiment 3 provides a marine hydrate production and reinjection system, which is improved on the basis of the production and reinjection well group 6 provided in Embodiment 1. The improvement is as follows:

[0062] refer to figure 2 , the marine hydrate production and reinjection system includes four production wells 1 and one reinjection well 3,

[0063] The four production wells 1 present a distribution of four vertices of a rectangle on the seabed, and the horizontal section of each production well 1 is set in the natural gas hydrate reservoir 200;

[0064] A reinjection well 3 is set at the center of a rectangle formed by connecting four production wells 1 end to end, and the horizontal section of the reinjection well 3 is set in the natural gas hydrate reservoir 200 and is located below the horizontal section of the production well 1...

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Abstract

The invention relates to a marine hydrate exploitation and reinjection system and method.The marine hydrate exploitation and reinjection system comprises at least one production well, a gas-liquid separator, at least one reinjection well, a seabed production pipe, a natural gas conveying pipe and a seabed reinjection pipe, and the production well is communicated with a gas-liquid mixture inlet of the gas-liquid separator through the seabed production pipe; a liquid outlet of the gas-liquid separator is communicated with the reinjection well through a seabed reinjection pipe, and a gas outlet of the gas-liquid separator is communicated with the offshore production platform through a natural gas conveying pipe. According to the marine hydrate exploitation and reinjection system and method disclosed by the invention, in the process of exploiting the marine hydrate of the natural gas hydrate reservoir through the production well, the marine hydrate is subjected to gas-liquid separation through the gas-liquid separator, gas is conveyed to the offshore production platform, and meanwhile, liquid is reinjected into the natural gas hydrate reservoir through the reinjection well; further decomposition of marine hydrates in a natural gas hydrate reservoir can be promoted, and the crude oil recovery rate is increased.

Description

technical field [0001] The invention relates to the technical field of marine hydrate exploitation, in particular to a marine hydrate exploitation and reinjection system and method. Background technique [0002] Marine hydrate reservoirs contain methane, combustible ice, etc., and have great development potential. They are another important resource in addition to conventional oil and natural gas in the development of offshore gas fields. Among them, with the development of oil and gas fields, not only oil and gas resources required by human beings are contained in formation fluids, but also a large amount of formation water is produced along with oil and gas in most oil and gas reservoirs. Because formation water will pollute the environment and cannot be discharged directly, a large amount of formation water treatment is a common and difficult to control problem. Water injection development is a mining method that can effectively improve oil recovery, and the reinjection ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/01E21B43/20E21B43/24E21B43/38E21B43/40
Inventor 郭放段梦兰冯玮戴琳琳覃雯琪陈长文段唯兴刘旭丰
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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