Shale gas exploitation method and system

A mining method and shale gas technology, which are applied in the field of shale gas mining methods and systems, can solve the problems of unverified safety, low mining efficiency, low energy utilization rate, etc. The effect of sufficient heat

Inactive Publication Date: 2019-07-16
SUZHOU UNIV
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Problems solved by technology

At present, there is a method of increasing the gas recovery rate of shale gas through explosion, but the safety of this method still needs to be verified
In addition, some shale gas reservoirs are mined by microwave heating, but the energy utilization rate is low, the cost is high, and the mining efficiency is low

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  • Shale gas exploitation method and system
  • Shale gas exploitation method and system

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Embodiment Construction

[0038] The invention discloses a method and a system for exploiting shale gas. By partially burning combustible gases such as methane in shale gas reservoirs, without providing additional fuel from the outside, the desorption of adsorbed gas and the heat generation of kerogen are promoted. The solution is to increase the permeability of shale gas reservoirs, thereby improving the extraction efficiency of shale gas.

[0039] Such as figure 1 Shown, the extraction method of shale gas of the present invention, it comprises steps:

[0040] S101: Obtain a shale gas reservoir.

[0041] Among them, after obtaining a suitable shale gas reservoir, the shale gas reservoir is drilled to obtain vertical wells, and each vertical well is connected to multiple horizontal wells within the scope of the shale gas reservoir, and one of the horizontal wells is selected for combustion. In one embodiment, three shafts may be drilled, each shaft connecting three horizontal wells within the shale g...

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Abstract

The invention discloses a shale gas exploitation method and system. The method comprises the following steps: pure oxygen is introduced into a shale gas reservoir, free-state shale gas preferentiallydiffused in a horizontal well and the reservoir is subjected to controllable combustion, thermal generated by combustion is transferred to a shale gas storage layer, the free energy of shale gas is improved, the intermolecular interaction force is reduced, methane and other gases adsorbed in a shale matrix pore network are desorbed, solid kerogen is pyrolyzed to generate pyrolysis gas, and thus shale gas is obtained. The system comprises a gas injection module, a gas collection module and a gas flow regulation module. The system is simple in structure and convenient to implement, the combustion degree can be controlled through the oxygen supply amount, no additional fuel is needed for heating, the economical efficiency is good, and combustion products are mainly water and carbon dioxide, so that environmental pollution is small.

Description

technical field [0001] The invention belongs to the technical field of shale gas exploitation, and in particular relates to a shale gas exploitation method and system. Background technique [0002] Shale gas refers to unconventional natural gas that occurs in organic-rich shale-dominated reservoir rock series, mainly in adsorbed and free states, and is a clean and efficient energy source. The main components of shale gas are hydrocarbons such as methane, which mainly exist in fractures, pores and other storage spaces in a free state, exist in kerogen, clay particles and pore surfaces in an adsorbed state, and store a very small amount in cheese in a dissolved state. Roots, asphaltenes and petroleum. [0003] my country's shale gas resources are very rich, with a technically recoverable resource volume of 36 trillion cubic meters, 1.6 times that of conventional natural gas, and has huge commercial value. However, compared with traditional oil and gas reservoirs, shale gas r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/243E21B43/241
CPCE21B43/243E21B43/241Y02P90/70
Inventor 陈威袁银男杨佳金
Owner SUZHOU UNIV
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