Method for exploiting natural gas hydrates by injecting saturated hot brine

A technology of natural gas and hot brine, applied in the direction of production fluid, earthwork drilling, wellbore/well components, etc., can solve the problems of increasing production cost and waste of heat energy, achieve low reservoir pressure, reduce energy input, and accelerate decomposition Effect

Inactive Publication Date: 2017-07-07
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology

However, this method leads to a large amount of waste of heat energy due to heat loss along the way, which greatly increases the mining cost.

Method used

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  • Method for exploiting natural gas hydrates by injecting saturated hot brine

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Embodiment Construction

[0021] The present invention will be further described below in conjunction with drawings and embodiments.

[0022] When the present invention is actually implemented, a batch of injection-production wells 4 are drilled according to a certain well pattern in the natural gas hydrate area to the top position of the natural gas hydrate reservoir 7 by using the existing oil and gas drilling technology; A horizontal fracture network 8 communicating with each other is formed on the top of layer 7 to inject saturated hot brine, increase the contact area between brine and natural gas hydrate, and serve as a flow channel for natural gas to enter the production well. At the same time, the surface temperature seawater 5 is pumped into the hot salt water pool 2 on the working platform 9 through the pump 1, and a sufficient amount of coarse salt is added to prepare saturated hot salt water. Then, the saturated hot brine prepared in a small volume is pumped into the horizontal fracture netw...

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Abstract

The invention relates to a method for exploiting natural gas hydrates by injecting saturated hot brine. The method is characterized in that the saturated hot brine is injected into a horizontal seam net which is cracked at the top of a natural gas hydrate reservoir stratum in advance, the natural gas hydrates are rapidly decomposed by virtue of the high salinity and the temperature of the hot brine, and moreover under the action of gravity differences, on one hand, a natural gas is extracted from the upper part of the reservoir stratum, and on the other hand, the hot brine is mixed with decomposed water to continuously decompose the natural gas hydrates. By adopting the method, the injection quantity is greatly reduced, thermal energy input is reduced, decomposition of the natural gas hydrates can be accelerated because of pressure drop formed by reservoir stratum volume voidage, in addition, production wastewater does not need to be fed back, and the natural gas hydrates can be economically and continuously exploited.

Description

technical field [0001] The invention relates to a method for exploiting natural gas hydrate, in particular to a method for injecting saturated hot brine to extract natural gas hydrate. Background technique [0002] Natural gas hydrate is a crystalline compound with a cage structure. There are two dodecahedrons and six tetradecahedrons per unit cell, and the terminals are all water molecules. These dodecahedrons and tetradecahedrons combine carbon Hydrocarbon compounds are included in the cage, and more than 90% of the included hydrocarbon compounds are methane, so natural gas hydrate is also called methane hydrate, and the molecular formula is CH 4 ·8H 2 O. [0003] Gas hydrates are widely found in the seabed or in permafrost regions. So far, the existence of gas hydrates has been confirmed in the Gulf of Mexico, the Caribbean Sea, the eastern continental margin of South America, the Okinawa Trough, and the Sea of ​​Japan. Natural gas hydrate reservoirs with huge reserves...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/24E21B43/01
CPCE21B41/0099E21B43/01E21B43/24
Inventor 张杰罗文万亭宇唐旭梅宝泰李鑫谢超杨森
Owner SOUTHWEST PETROLEUM UNIV
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