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System and method for artificially enriching and exploiting deep-water shallow-layer low-abundance unconventional natural gas

An unconventional natural gas, low-abundance technology, used in fluid extraction, earthwork drilling, measurement, etc., can solve the problem of high energy density, reduce costs, avoid sand production problems, and reduce operation time.

Active Publication Date: 2021-01-22
QINGDAO INST OF MARINE GEOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Compared with shallow gas or hydrate-associated gas, deep-sea gas hydrate has the characteristics of high energy density, and after nearly two decades of development, although there are still great scientific and technical challenges in the development of marine gas hydrate, its development The maturity of technology is much higher than that of shallow gas

Method used

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  • System and method for artificially enriching and exploiting deep-water shallow-layer low-abundance unconventional natural gas

Examples

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Effect test

Embodiment 1

[0041] Example 1, a system for exploiting deep-water, deep-water and shallow-layer low-abundance unconventional natural gas by hydrate enrichment method, such as figure 1 As shown, including mineralization system, transport system and collection system;

[0042] The ore-forming system includes a large artificial foundation pit 5 built in deep sea, gravel 6 buried in the large artificial foundation pit 5, a dome cover layer 10 covering the upper part of the large artificial foundation pit 5, and the gravel 6 arranged inside The test sensor 7, the dome cover layer 10 is designed with a reserved port connected to the collection system, and the ore-forming system is used to accumulate and enrich the low-abundance unconventional natural gas in deep water and shallow layers, so that it can form a high saturation in the artificial foundation pit 5 natural gas hydrate reservoirs;

[0043] The transportation system includes a directional communication well 2 starting from the bottom o...

Embodiment 2

[0057] Implementation 2. Based on the system proposed in Example 1, this example proposes a method for exploiting deep-water, deep-water and shallow-layer low-abundance unconventional natural gas by hydrate enrichment, which specifically includes the following steps:

[0058] 1. Use the onboard equipment and technology of the natural gas hydrate survey ship to determine the distribution range of low-abundance unconventional natural gas in deep water and shallow layers through shallow strata survey; determine the occurrence area of ​​low-abundance unconventional natural gas in deep water and shallow layers and the seabed of adjacent areas Shallow strata temperature and pressure, preferably the location of hydrate-induced ore-forming area;

[0059] 2. In the preferred hydrate-induced ore-forming area, a large-scale artificial foundation pit 5 is formed by means of seabed shield or seabed excavation. At the bottom and edge of the large-scale artificial foundation pit 5, according ...

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Abstract

The invention discloses a system and a method for artificially enriching and exploiting deep-water shallow-layer low-abundance unconventional natural gas. The system and the method realize low-cost development of the deep-water shallow-layer low-abundance unconventional natural gas by enriching the deep-water shallow-layer low-abundance unconventional natural gas, inducing enrichment of low-abundance shallow-layer gas and forming a high-abundance hydrate mineral deposit, and finally, large-scale exploitation of shallow gas, hydrate associated gas and hydrate is promoted. The scheme belongs tothe technology of one-time investment and multiple-time development, and once a mineralization system, a conduction system and a collection system are built, additional maintenance investment is not needed subsequently, so that the cost is reduced; in the artificial hydrate reservoir forming waiting period, a hydrate mining platform is not required to be in place, and only in place when mining isrequired, so that the field operation time is effectively shortened, and the cost is greatly reduced; and meanwhile, the defects of poor permeability and low mining efficiency of the existing argillaceous silty sand natural gas hydrate reservoir are overcome, and technical support is provided for finally promoting large-scale mining of shallow gas.

Description

technical field [0001] The invention belongs to the technical field of marine unconventional energy development, and specifically relates to a system and method for enriching deep-water and shallow low-abundance unconventional natural gas by using a hydrate-induced ore-forming method and exploiting and utilizing it. Background technique [0002] Deep-water shallow low-abundance unconventional natural gas is widely distributed in deep-water undiagenetic formations, the main components are methane, ethane, etc., and the main types include hydrates, hydrate-associated gas and generated Shallow gas stored in shallow sediments. [0003] Taking shallow gas as an example, the current literature survey results show that most of the shallow gas is biogenic gas, and a large amount of alkane gas is produced in situ after organic matter is decomposed, and accumulates in undiagenetic formations; however, because shallow gas Well construction and development are difficult in the shallow ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/01E21B43/08E21B47/00E21B47/06
CPCE21B43/01E21B47/00E21B47/06E21B43/086E21B41/0099
Inventor 李彦龙吴能友陈强胡高伟
Owner QINGDAO INST OF MARINE GEOLOGY
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