Low permeability reservoir frequency-adjustable pulse hydraulic fracturing reformation device

Abstract

The invention discloses a low permeability reservoir frequency-adjustable pulse hydraulic fracturing reformation device, which is suitable for physical model tests in a low permeability reservoir hydraulic fracturing reformation room, and belongs to the field of unconventional natural gas exploitation. The low permeability reservoir frequency-adjustable pulse hydraulic fracturing reformation device consists of a pulse control box, a pulse generator assembly, an upper slide valve sealer assembly, a lower slide valve sealer assembly, a jet nozzle assembly, a pump station and a connection pipeline, wherein the pulse generator assembly, the upper slide valve sealer assembly, the jet nozzle assembly and the lower slide sealer assembly are connected in sequence to construct an internal well part of device; an upper end of the pulse generator assembly is connected with the pump station and the pulse control box through pipelines; the connection pipeline is used for conveying high-pressure liquid flow and an electric signal to a well. By adopting the low permeability reservoir frequency-adjustable pulse hydraulic fracturing reformation device, the frequency-adjusting range of pulse water hammer jet flow is large, the frequency is accurately controllable, and a pulse jet flow liquid injection way and a continuous jet flow liquid injection way can be switched optionally; sealing-fracturing-deblocking integral operation can be formed.

Description

technical field [0001] The invention relates to a reservoir hydraulic fracturing transformation device for indoor physical model tests, in particular to a low-permeability reservoir adjustable frequency pulse hydraulic fracturing transformation device, which belongs to the field of unconventional natural gas exploitation. Background technique [0002] During the exploitation of unconventional natural gas (coalbed methane, shale gas, etc.) reservoirs, in order to effectively improve the permeability of low-permeability gas reservoirs and maintain stable production, fracturing technology is usually used to communicate in-situ pores and enrich the natural fracture network, thereby Increase gas production. Unconventional reservoirs usually have the characteristics of low pressure, low permeability, and low saturation. Although fracturing with conventional continuous-flow water injection fracturing technology can improve the permeability of the reservoir to a certain extent, it i...

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Problems solved by technology

Although the above two types of hydraulic pulse devices have been successfully applied to coal seam water injection in coal mines and oil drilling to assist jet rock breaking, it is still difficult to adapt to low-permeability reservoir pulse hydraulic fracturing and indoor physical model tests.

For example, the existing pump source hydraulic pulse generating device has high equipment cost and complex structure, which is only suitable for pulsating water injection in coal mines, and is not suitable for long-distance well pipe fracturing; the existing pipe section hydraulic pulse generating device mostly uses variable flow rate to control the frequency, If the hydraulic pulse frequency is too high or too low, it is difficult to accurately control the optimal hydraulic pulse frequency according to the characteristics of different reservoirs (coal rock, shale, etc.), and it cannot be used for sealing and fracturing of well pipe sections, etc.

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