Method for exploiting natural gas hydrate

A hydrate and natural gas technology, applied in the fields of fluid extraction, earthwork drilling, climate sustainability, etc., can solve the problems of potential geological safety hazards, high gas injection cost, low gas injection-production ratio, etc. Secondary growth and icing behavior, enhanced gas mass transfer behavior, and reduced sediment migration effects

Active Publication Date: 2021-06-04
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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Problems solved by technology

According to the field test results, the use of gas huff and puff to exploit natural gas hydrate has high gas injection costs, and a large amount of gas is re-produced in the pores, resulting in extremely low utilization efficiency of injected gas. 2 Hydrate directly wraps the original natural gas hydrate, resulting in low production efficiency and low concentration of produced gas
In addition, the field test also included the problems of low gas injection-production ratio and low replacement efficiency, and the large fluctuation of reservoir pressure also poses geological safety hazards

Method used

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  • Method for exploiting natural gas hydrate
  • Method for exploiting natural gas hydrate
  • Method for exploiting natural gas hydrate

Examples

Experimental program
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Embodiment 1

[0038] Such as figure 1 As shown, the present invention provides a method for exploiting natural gas hydrate, comprising the steps of:

[0039] S1: Establish gas injection wells and production wells in areas where natural gas hydrates are to be exploited;

[0040] S2: Determine the injection pressure of the injection well according to the formation permeability of the gas hydrate to-be-produced area and the well spacing between the gas injection well and the production well;

[0041] S3: According to the injection pressure, open the gas injection well and inject gas containing carbon dioxide into the natural gas hydrate reservoir in the area where the natural gas hydrate is to be produced to displace the pore fluid of the natural gas hydrate reservoir, the gas the injection well, the gas hydrate reservoir and the production well are in communication;

[0042] S4: collecting produced gas from the production well and monitoring the composition of the produced gas;

[0043] S5...

Embodiment 2

[0081] The present embodiment has carried out physical simulation experiment to the present invention, and implementation experiment specifically comprises the following steps:

[0082] Such as Figure 4 As shown, a methane hydrate sample similar to marine natural gas hydrate is prepared in a three-dimensional model, and a gas injection well 2 and a production well 3 are symmetrically distributed at both ends; the parameters in the figure are only exemplary and do not represent the present invention limits.

[0083] The natural gas hydrate reservoir pressure is reduced by conventional depressurization production method, and the pressure drop range is 1.5MPa;

[0084] A mixture of carbon dioxide and nitrogen is injected into the sample from gas injection well 2, where the concentration of carbon dioxide is 56%, and the gas produced by production well 3 is a mixed gas containing carbon dioxide, nitrogen and methane, and the gas chromatograph is used to measure the composition o...

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Abstract

The invention provides a method for exploiting natural gas hydrate. The method comprises the following steps that a gas injection well and a production well are built in a natural gas hydrate to-be-exploited area; according to the formation permeability of the natural gas hydrate to-be-exploited area and the well spacing between the gas injection well and the production well, the injection pressure of the injection well is determined; according to the injection pressure, the gas injection well is opened to inject gas containing carbon dioxide into a natural gas hydrate reservoir of the natural gas hydrate to-be-exploited area to displace pore fluid of the natural gas hydrate reservoir, and the gas injection well, the natural gas hydrate reservoir and the production well communicate with one another; the produced gas is collected from the production well, and the composition of the produced gas is monitored; and when the produced gas is lower than a set value or the collection task is completed, the gas injection well and the production well are closed to complete the collection. High-pressure gas displaces pore fluid to reduce natural gas partial pressure in a pore fluid phase, meanwhile, the high-pressure gas effectively inhibits invasion of a peripheral water phase, and the exploiting effect is improved.

Description

technical field [0001] The invention relates to the technical field of exploiting natural gas hydrates, in particular to a method for exploiting natural gas hydrates. Background technique [0002] Natural gas hydrate, that is, combustible ice, as an emerging clean energy, has the characteristics of wide distribution, large scale, and high energy density, and is recognized as an important strategic energy reserve in the 21st century. It is optimistically estimated that the total resources of natural gas hydrates in the world will reach 18-21 trillion oil equivalents, of which the reserves of marine hydrate resources account for about 97% of the total reserves. extensive attention. my country is rich in hydrate resources in sea areas. At present, the proven hydrate prospect resources in the northern South China Sea are as high as 74.4 billion tons of oil equivalent, and two hydrate deposits equivalent to more than 100 billion cubic meters of natural gas reserves have been ide...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/01E21B43/30E21B43/16E21B47/06
CPCE21B43/01E21B43/30E21B43/164E21B47/06Y02P90/70
Inventor 孙漪霏陈道毅陈光进钟瑾荣曹博健
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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