Method for green extraction of seabed unstratlfied rock natural gas hydrate

A mining method and technology for natural gas, which are applied in the fields of production of fluids, earth-moving drilling, wellbore/well components, etc., can solve the problems of large mechanical energy consumption, high production cost, unfavorable large-scale commercial production of natural gas hydrate, etc. Cost, high collection efficiency, exquisite design effect

Active Publication Date: 2015-11-18
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology

However, there are also various problems in the method, especially the energy consumption problem in the mining process.
Mining machinery needs to break the cemented gas hydrate into small particles, and the crushed gas hydrate particles need to be pumped to the treatment platform on the sea surface, both of which consume a lot of mechanical energy
If the energy supply problems in these two aspects cannot be reasonably solved, the production cost will be high, which will be unfavorable for the large-scale commercial production of natural gas hydrate

Method used

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  • Method for green extraction of seabed unstratlfied rock natural gas hydrate
  • Method for green extraction of seabed unstratlfied rock natural gas hydrate

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Embodiment 1

[0025] Embodiment one: figure 1 It shows an embodiment of a seabed non-diagenetic natural gas hydrate collection device of the present invention. A seabed non-diagenetic natural gas hydrate collection device includes a hydraulic turbine 8, which is connected to a seawater introduction pipeline. The output shaft of the water conservancy turbine 8 is connected with the mining head 1, a particle collection pipeline is arranged near the mining head 1, a separator 4 is arranged on the particle collection pipeline, and a sediment discharge port is also provided on the separator 4 , the outlet pipe of the water conservancy turbine 8 is collected with the particle collection pipe, and is connected with the outlet pipe, and a blender 10 is arranged at the collection place, and the outlet pipe is connected with the integrated treatment platform 11, and the integrated treatment platform 11 is also provided with a seawater inlet pipe, a natural gas discharge port, an impurity discharge po...

Embodiment 2

[0027] Figure 1-2 It shows an embodiment of a green mining method of seabed non-diagenetic natural gas hydrate in the present invention, the mining method is realized by a special mining device for green mining of seabed non-diagenetic natural gas hydrate, and the mining device includes: mining head 1 , a separator 4, a blender 10, a delivery pipeline and an integrated processing platform 11, the mining method comprises the following steps:

[0028] Step 1. Pretreatment of natural gas hydrate: without changing the temperature and pressure of the seabed, the natural gas hydrate solid on the seabed is crushed by mining head 1;

[0029] Step 2. Pre-collection of natural gas hydrate: send the crushed natural gas hydrate solid into the collection pipeline, and enter the separator 4 for separation, and temporarily store the suitable natural gas hydrate;

[0030] Step 3. Collection of natural gas hydrate: By changing part or all of the broken natural gas hydrate into a gaseous stat...

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Abstract

The invention discloses a method for green and energy-saving extraction of a seabed unstratlfied rock natural gas hydrate and belongs to the technical field of natural gas extraction. The method comprises the steps of pre-treatment of the natural gas hydrate, pre-collection of the natural gas hydrate, separation of the natural gas hydrate, and collection of the natural gas hydrate. The working principle is that on the premise that the ambient temperature and pressure of a natural gas hydrate formation are not changed, natural gas hydrate solid sediment is extracted through submarine mining, phase change is conducted on the natural gas hydrate by means of hot seawater to generate an airlift effect, and then the natural gas hydrate is lifted the sea surface to be processed and natural gas is collected finally. Meanwhile, the airlift effect serves as the power source of an extraction head, external energy consumption is reduced, and sea pollution is avoided. The method is a green natural gas collection method.

Description

technical field [0001] The invention relates to the technical field of seabed natural gas hydrate mining, in particular to a solid fluidized green energy-saving mining method of seabed non-diagenetic natural gas hydrate. Background technique [0002] Natural gas hydrate, also known as combustible ice, is a "cage compound" formed by methane-based hydrocarbon gas and water under certain temperature and pressure conditions, and has a white crystalline structure. Gas hydrate reserves are huge, more than twice the sum of known carbon fossil fuels, and mainly exist in terrestrial permafrost and oceanic seabeds. The reserves of oceanic seabed gas hydrates far exceed those in land permafrost areas. [0003] The United States, Japan, Russia and other countries have carried out test production research on natural gas hydrate respectively. The main test production methods include heat injection method, depressurization method, inhibitor method and a combination of several methods. The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/01E21B43/40
Inventor 王国荣王雷振王川周旭谢真强张亦驰
Owner SOUTHWEST PETROLEUM UNIV
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