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High-voltage electric pulse hydraulic fracturing coal rock mass method and guide fracture opening device

A high-voltage electric pulse and hydraulic fracturing technology, which is applied in the fields of production fluid, earthwork drilling, wellbore/well components, etc., can solve the problems of difficult gas production, strong heterogeneity, and low permeability

Active Publication Date: 2022-07-08
INNER MONGOLIA UNIV OF SCI & TECH
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Problems solved by technology

Although the United States, Canada and other countries already have some mature coalbed methane and shale gas development technologies, due to the deep burial, tight reservoirs, low permeability and strong heterogeneity of coalbed methane and shale gas in my country, etc. The characteristics lead to difficulties in gas extraction, and foreign unconventional natural gas extraction methods cannot be fully applied to my country

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  • High-voltage electric pulse hydraulic fracturing coal rock mass method and guide fracture opening device
  • High-voltage electric pulse hydraulic fracturing coal rock mass method and guide fracture opening device
  • High-voltage electric pulse hydraulic fracturing coal rock mass method and guide fracture opening device

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Embodiment Construction

[0041] The embodiments of the present application will be described in detail below with reference to the accompanying drawings and examples, so as to fully understand and implement the implementation process of how to apply technical means to solve technical problems and achieve technical effects in the present application.

[0042] The embodiment of the high-voltage electric pulse hydraulic fracturing coal rock mass method provided by the present invention mainly includes the following steps:

[0043] Step 1, select an area suitable for mining unconventional natural gas in the coal and rock mass, and delineate the drilling path and depth;

[0044] Step 2, use drilling equipment to drill, and drill a columnar well in the coal seam along the horizontal direction in the mining area, the diameter of the well is 300mm, and the depth of the well is greater than 200m;

[0045] Step 3, clean up the debris and water in the drilling;

[0046] Step 4, according to the diameter and dep...

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Abstract

The invention belongs to the technical field of high-voltage electric pulse hydraulic fracturing to exploit unconventional natural gas, and specifically includes a high-voltage electric pulse hydraulic fracturing method for fracturing coal and rock mass and a device for opening guiding cracks. Before natural gas extraction, drilling is carried out on the surface of the mining area, and a pilot crack opening device is used to open a pilot fracture on the wellbore, and then the wellhead is sealed, and the high voltage electric pulse hydraulic fracturing technology is used to fracture the wellbore, thereby Ideal fissures are generated in the coal rock to increase and open up the migration channel of unconventional natural gas in the coal rock layer, thereby improving the gas extraction efficiency. The guide fracture opening device can travel in drilling, and the provided slit part can rotate around the axis and move along the axial direction along the guide part. The slotted part in the device can perform a combined movement along the guide part in the axial direction and around the axis. Therefore, by controlling the movement, the slotted part can open a pilot fracture on the well wall according to a preset path.

Description

technical field [0001] The invention belongs to the technical field of high-voltage electric pulse hydraulic fracturing coal rock mass mining unconventional natural gas, in particular to a high-voltage electric pulse hydraulic fracturing coal rock mass method and a device for opening guiding cracks. Background technique [0002] With the rapid development of my country's economy, the demand for energy has been increasing in recent years, coupled with the adjustment of traditional energy structure (that is, reducing dependence on coal, oil, natural gas, etc.) The exploitation of unconventional natural gas such as oil sands gas has attracted more and more national attention. China is rich in both coalbed methane and shale gas resources, among which coalbed methane is the third country with the largest coalbed methane reserves after Russia and Canada, and the proven resource reserves of shale gas are about 30.7×1012 m 3 , mainly distributed in the Tarim Basin, Ordos Basin, Sic...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/00E21B43/26
CPCE21B43/00E21B43/006E21B43/26
Inventor 鲍先凯张武赵双王舒锐吴宁
Owner INNER MONGOLIA UNIV OF SCI & TECH
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