A method for reforming and exploiting natural gas hydrate reservoirs in sea areas

A technology for reservoir stimulation and hydrate, which can be used in the fields of fluid production, earth-moving drilling, wellbore/well components, etc., and can solve problems such as lack of

Active Publication Date: 2018-12-25
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Claims
  • Application Information

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However, there is currently a lack of research on specific

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  • A method for reforming and exploiting natural gas hydrate reservoirs in sea areas
  • A method for reforming and exploiting natural gas hydrate reservoirs in sea areas
  • A method for reforming and exploiting natural gas hydrate reservoirs in sea areas

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Embodiment 1

[0038] This embodiment provides a method for reforming and exploiting natural gas hydrate reservoirs in sea areas. The method specifically includes the following steps:

[0039] Under certain temperature conditions, CO 2 The formation pressure of hydrate is lower than that of methane hydrate. In the natural environment, there is a wide range of CO in the upper region of gas hydrate reservoirs. 2 Hydrate thermodynamically stable region. The environment for the occurrence of gas hydrate in sea areas is as follows: figure 1 As shown, from top to bottom, it is divided into: upper seawater layer 1, upper overburden layer 2, gas hydrate reservoir 3, and lower overburden layer 4.

[0040] Through the upper seawater layer 1 and the upper overburden 2, a production well 9 is deployed in the gas hydrate reservoir 3; through the upper seawater layer 1, a series of injection wells 8 are drilled around the production well 9 in the upper overburden 2.

[0041] Before the depressurization...

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Abstract

The invention provides a method for reforming and exploiting natural gas hydrate reservoirs in sea areas. The method comprises: deploying a production well in a natural gas hydrate reservoir, deploying an injection well in the upper caprock of the natural gas hydrate reservoir; injecting CO2 into the injection well, and stopping the injection when the CO2 covers the upper caprock of the natural gas hydrate reservoir CO2; when the growth of CO2 hydrate in the upper caprock sediments stops, or when the average saturation of CO2 hydrate is greater than 30%, the depressurization mining method is used for mining; when the CO2 molar content in the produced gas composition is greater than 90%, the Stop mining, close production wells, and complete the reconstruction and exploitation of natural gas hydrate reservoirs in sea areas. The method can prevent the uncontrollable escape of natural gas and the flooding of the reservoir by seawater during the production process, reduce the water binding effect, increase the gas production rate, and maintain the mechanical stability of the formation.

Description

technical field [0001] The invention relates to a method for reforming and exploiting reservoirs, in particular to a method for reforming and exploiting natural gas hydrate reservoirs in sea areas, and belongs to the field of natural gas hydrate exploitation. Background technique [0002] Natural gas hydrate is an ice-like solid crystal composed of natural gas and water molecules. Natural gas is mainly composed of methane, so it is also called methane hydrate. The energy density of natural gas hydrate is very high. According to theoretical calculations, 1 cubic meter of saturated natural gas hydrate can release 164 cubic meters of methane gas under standard conditions. 10 times the energy density, 2-5 times the energy density of conventional natural gas. [0003] Although the prospect of hydrate resources is attractive, due to the complexity of the environment of gas hydrate resources and the possible environmental safety issues during the development process, the world is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/01E21B43/22
CPCE21B43/01E21B43/164E21B41/0099
Inventor 孙长宇顾金祥陈光进李楠刘蓓杨兰英孙振峰
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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