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System and method for artificial enrichment and exploitation of deep-water shallow low-abundance unconventional natural gas

An unconventional natural gas, low-abundance technology, applied in the direction of production fluid, earthwork drilling, wellbore/well components, etc., can solve the problems of high energy density, achieve the goal of overcoming poor permeability, reducing costs, and realizing sustainable development Effect

Active Publication Date: 2021-07-27
QINGDAO INST OF MARINE GEOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 artificial enrichment and exploitation of deep-water shallow 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 method for artificially enriching and exploiting low-abundance unconventional natural gas in deep-water shallow layers. By enriching deep-water shallow-layer low-abundance unconventional natural gas, low-abundance shallow gas is induced to enrich and form high abundance. The low-abundance unconventional natural gas in deep water and shallow layers can be developed at low cost, and ultimately promote the large-scale exploitation of shallow gas, hydrate-associated gas, and hydrate. This scheme belongs to the technology of one-time investment and multiple developments. Once the ore-forming system, transmission system and collection system are built, no additional maintenance investment will be required in the future, which will help reduce costs; and the waiting period for artificial hydrate accumulation does not require hydration It only needs to be in place when it needs to be mined, which can effectively reduce the time of on-site operation and greatly reduce the cost; at the same time, it can overcome the current weaknesses of poor permeability and low mining efficiency of muddy silt gas hydrate reservoirs, so as to ultimately promote Provide technical support for large-scale exploitation 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 Patents(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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