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Methods of mining gas hydrates

A technology for natural gas and hydrate, applied in the fields of fluid extraction, coal gasification, and earth-moving drilling, etc., can solve the problems of polluted environment, serious sand production, low productivity, etc., achieve high reservoir sweep rate, prevent formation collapse, reduce The effect of differential pressure

Active Publication Date: 2020-04-17
BC P INC CHINA NAT PETROLEUM CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for exploiting natural gas hydrates in order to overcome the problems of low yield, serious sand production, high cost, and environmental pollution in the prior art.

Method used

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  • Methods of mining gas hydrates
  • Methods of mining gas hydrates
  • Methods of mining gas hydrates

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0077] Such as figure 1 As shown, the system has an injection well 1 and a production well 2. The production well and the production well are completed by fracturing, and the production well 2 is equipped with a complete set of sand control system, and the mud line is equipped with a safety valve. The production pipeline connects the wellhead safety valve and the platform. The platform is equipped with the second fluid lifting unit and control system, gas-liquid separation system, gas pretreatment system and gas transmission system. The water injection well has a power supply system, a control system, an injection and control unit, a filtration system and an electric submersible pump.

[0078] In the mining process, the first fluid (mineral oil containing Span, containing 4-12 carbon atoms, dynamic viscosity of 1-20mPa·s, and Span content of 2g / 100mL) is pumped into the reservoir by an underwater electric pump, the first fluid (temperature is 2°C, pressure is 8MPa) migrate...

Embodiment 2

[0083] Referring to the method described in Example 1 to exploit natural gas hydrate, the difference is that only the mineral oil described in Example 1 is used as the first fluid. All the other are identical with embodiment 1. The mining results are shown in Table 1.

Embodiment 3

[0085] Referring to the method described in Example 1 to exploit natural gas hydrate, the difference is that the mixed solution of mineral oil and water described in Example 1 is used (the volume ratio of mineral oil to water is 8:2, and the content of Sipan is 4g / 100mL ) as the first fluid. All the other are identical with embodiment 1. The mining results are shown in Table 1.

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Abstract

The invention relates to the field of natural gas hydrate exploitation, and discloses a method for exploiting natural gas hydrate. The method comprises the steps that (1) first fluid is introduced into a natural gas hydrate reservoir by at least one injection well to obtain second fluid dissolved with natural gas; (2) at least one production well leads the second fluid to the ground or sea surfacefor gas-liquid separation to obtain the natural gas; and (3) third fluid is led into the natural gas hydrate reservoir from at least one injection well to replace the residual first fluid and / or second fluid in the reservoir, wherein the first fluid contains oil with 4-30 carbon atoms and dynamic viscosity being 1-100 mPa.s or a mixture of the oil and water. The method is simple, convenient and effective for exploiting natural gas hydrate, and meanwhile, the method does not disadvantageously cause geological disaster problems such as stratum collapse, and the ecological environment of oceansand reservoirs are not be damaged.

Description

technical field [0001] The invention relates to the field of natural gas hydrate exploitation, in particular to a method for exploiting natural gas hydrate. Background technique [0002] Natural gas hydrate is combustible ice, which is distributed in deep sea sediments or permafrost in land areas, and is an ice-like crystalline substance formed by natural gas and water under high pressure and low temperature conditions. Because it looks like ice and can burn when exposed to fire, it is also called "combustible ice", "solid gas" or "air ice", but it is actually a solid block. Natural gas hydrates are widely distributed in continental permafrost, slopes of islands, uplifts of active and passive continental margins, polar continental shelves, and deep-water environments in oceans and some inland lakes. The total carbon content of combustible ice in the world is about twice the total carbon content of other fossil energy sources. Its reserves are huge and it is said that it has...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/01E21B43/22E21B43/295E21B43/28E21B43/30E21B43/40
Inventor 陈立涛周万田张宁涛孙宝江
Owner BC P INC CHINA NAT PETROLEUM CORP
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