Electric pulse assisted hydrofracture unconventional gas reservoir permeability increasing method

An unconventional natural gas and hydraulic fracturing technology, which is applied in the direction of earthwork drilling, production fluid, wellbore/well components, etc., can solve the problem of not being able to effectively improve the permeability of the reservoir, so as to overcome the slow loading speed and improve drainage Efficiency, saving energy material consumption effect

Inactive Publication Date: 2015-08-12
TAIYUAN UNIV OF TECH
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Problems solved by technology

[0009] In order to solve the problem that the existing unconventional natural gas reservoir anti-permeability technology cannot effectively improve the gas permeabil

Method used

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  • Electric pulse assisted hydrofracture unconventional gas reservoir permeability increasing method

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Embodiment Construction

[0023] An unconventional natural gas reservoir permeability enhancement method for electric pulse assisted hydraulic fracturing, comprising the following steps:

[0024] 1) Drill the unconventional natural gas wellbore 6 on the ground at the reservoir position, and lower the discharge electrode 9 to the reservoir position to be enhanced through the drawworks 5;

[0025] 2) Use the upper hole sealing device 8 and the lower hole sealing device 14 to seal the part of the reservoir to be enhanced in permeability, and then use the high-pressure water pump 10 to inject water into the sealing hole through the water injection pipe 7 to reach the set static pressure;

[0026] 3) According to different geological environments, select different discharge parameters and loading modes, and use the high-voltage power supply vehicle 1 to perform controllable pulse discharge loading on the reservoir through the discharge electrode 9;

[0027] 4) After the discharge process is completed, drain...

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Abstract

The invention relates to unconventional gas reservoir permeability increasing methods, in particular to an electric pulse assisted hydrofracture unconventional gas reservoir permeability increasing method. The electric pulse assisted hydrofracture unconventional gas reservoir permeability increasing method comprises the following steps that a hole is drilled in an unconventional gas reservoir, and a discharge electrode is descended to the position of the reservoir with permeability to be increased through a winch; the drilled hole of the reservoir is sealed, and water is injected into the drilled hole of the reservoir through a water injection pipe to achieve the preset static pressure; discharge equipment is used for pulse discharge through the discharge electrode; after the discharge process is finished, the water in the drilled hole of the reservoir is drained, natural gas exhausting and mining equipment is connected, and then natural gas is collected through the natural gas exhausting and mining equipment. The high pressure pulse discharge and hydrofracture technology are integrated creatively, the cavitation effect of the high pressure pulse discharge and the instantaneous loading function of water shock are used for achieving the purposes of changing the existence state of natural gas, increasing the reservoir fracture, reducing weakening intensity, improving permeability and improving the exhausting and mining efficiency of natural gas. The electric pulse assisted hydrofracture unconventional gas reservoir permeability increasing method also has very wide application prospects on the aspect of unconventional gas exhausting and mining.

Description

technical field [0001] The invention relates to an anti-permeability method for unconventional natural gas reservoirs, in particular to an anti-permeability method for unconventional natural gas reservoirs with electric pulse assisted hydraulic fracturing. Background technique [0002] Unconventional natural gas resources refer to a type of natural gas resources that have not been fully understood and developed without mature technologies and experiences that can be used for reference. Mainly include: coalbed methane (gas), shale (mud) gas, tight gas (tight sandstone gas, volcanic gas, carbonate rock gas), etc. With the continuous development of my country's economy, the demand for energy is also increasing. The development and utilization of unconventional natural gas energy has aroused widespread concern in today's society. As a large developing country, China is in a critical period of economic and social development and urgently needs a large amount of high-quality and...

Claims

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Application Information

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IPC IPC(8): E21B43/26E21B28/00
CPCE21B43/26E21B43/006
Inventor 赵金昌卞德存闫东薛荣芳
Owner TAIYUAN UNIV OF TECH
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