Device and method for directional fracturing of shale by plasma
A plasma and fracturing technology, which is applied in the direction of mining fluid, earthwork drilling, wellbore/well components, etc., can solve the problem of the occurrence of overlying strata and underlying strata, and can not realize the uniform action of shale, extension and Expansion is difficult to control and other problems, to achieve a wide range of practical value, solve the problem of fracturing and seepage increase, and the effect of simple operation
Active Publication Date: 2022-04-15
CHINA UNIV OF MINING & TECH
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Problems solved by technology
[0004] 1. Affected by the heterogeneity of the shale reservoir during the fracturing process, the water cannot achieve a uniform effect on the shale, which makes it difficult to control the extension and expansion of the fracture inside the shale, and also affects the overlying rock and the underlying rock. Occurrence of overlying strata caused certain damage
[0005] 2. The fracturing process requires a large amount of clean water resources. When a large amount of water resources remain inside the shale, it will cause water locks and waste water resources.
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[0050] In the description of the present invention, it should be understood that the orientations or positional relationships indicated by the terms "left side", "right side", "upper", "lower" are based on the orientations or positional relationships shown in the accompanying drawings, and are only For the purpose of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, "first", "second" and the like do not represent components importance, and therefore should not be construed as limiting the invention. The specific dimensions used in this embodiment are only for illustrating the technical solution, and do not limit the protection scope of the present invention.
[0051] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific preferred embo...
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Abstract
The invention discloses a device and method for directional fracturing of shale by plasma, which comprises an energy-gathering perforation device, a nano-conductive powder delivery device, and a plasma discharge device. The energy-focused perforation device includes a high-pressure fluid pump station, a jet fluid delivery pipe, and a perforator. The energy-focused perforation device can build directional fractures and grooves inside the shale reservoir. The nano conductive powder conveying device includes a conveying fan, a nano conductive powder conveying pipe and a conveying nozzle for spraying the nano conductive powder and the oxidant powder on the surface of the oriented slot. The plasma discharge device is used to repeatedly discharge the directional slot, including a high-voltage cable, a wire driver, a metal wire, a plasma generator, a high-voltage discharge switch, a positive electrode, and a negative electrode. The device induces plasma discharge through nanometer-level conductive powder to perform directional fracturing on coal and rock mass, providing an effective means for the development of shale gas.
Description
technical field [0001] The invention relates to the field of directional fracturing of shale reservoirs, in particular to a device and method for directional fracturing of shale by plasma. Background technique [0002] my country's shale reservoirs have the characteristics of large burial depth, high temperature, high pressure and extremely low gas permeability, which have caused great difficulties for the development of shale gas. Therefore, in order to realize shale gas The commercial exploitation of shale gas resources must artificially modify the permeability of the original reservoir to form interconnected fractures inside the original reservoir, so as to achieve the mass production of shale gas. [0003] At present, the commonly used shale reservoir permeability enhancement measures are mainly hydraulic fracturing. A large number of scholars have studied related technologies and achieved good field application results. However, there are still the following problems in ...
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IPC IPC(8): E21B43/26
CPCE21B43/26E21B43/2607
Inventor张祥良刘厅林柏泉申建
OwnerCHINA UNIV OF MINING & TECH