Method of reforming and exploiting marine natural gas hydrate reservoir

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: 2017-05-31
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Description
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  • Application Information

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  • Method of reforming and exploiting marine natural gas hydrate reservoir
  • Method of reforming and exploiting marine natural gas hydrate reservoir
  • Method of reforming and exploiting marine natural gas hydrate reservoir

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Embodiment 1

[0038] The present embodiment provides a method for reforming and exploiting natural gas hydrate reservoirs in sea areas, and 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 2 Hydrate thermodynamically stable region. The environment for the occurrence of natural gas hydrate in the sea area is as follows: figure 1 As shown, from top to bottom, it is divided into: upper seawater layer 1, upper overburden layer 2, natural gas hydrate reservoir 3, and lower overburden layer 4.

[0040] A production well 9 is deployed in the gas hydrate reservoir 3 through the upper seawater layer 1 and the overburden 2 ;

[0041] Before the start of depressurization, the production well 9 is closed and the liquid CO 2 Injection into gas hydrate overburden 2 through injection well 8, monitoring of injected CO b...

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Abstract

The invention provides a method of reforming and exploiting a marine natural gas hydrate reservoir; the method comprises: arranging a production well in the natural gas hydrate reservoir, and an injection well in upper cap rock of the natural gas hydrate reservoir; injecting CO2 into the injection well, and stopping the injection of CO2 when the CO2 covers the upper cap rock of the natural gas hydrate reservoir; when CO2 hydrate in the deposit of the upper cap rock stops growing or after average saturation of the CO2 hydrate is greater than 30%, exploiting by means of depressurizing production; when the molar content of the CO2 in produced gas is greater than 90%, stopping exploitation, closing the production well, and completing reforming and exploiting of the marine natural gas hydrate reservoir. The method has the advantages that uncontrollable escape of natural gas and immersion of the reservoir by sea water can be prevented, water restraint effect is relieved, gas production rate is increased, and mechanical stability of a stratum is maintained.

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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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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