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Oil-gas-well hydraulic-fracturing down-hole low-frequency hydraulic-pulse generating device

A generating device and well hydraulic technology, which is applied in the direction of wellbore/well components, production fluid, earthwork drilling and production, etc., can solve problems such as uncontrollability and steering uncertainty, reduce settlement, improve flow conductivity, and promote uniformity The effect of sanding

Active Publication Date: 2017-08-22
XI'AN PETROLEUM UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the construction of conventional diversion refracturing technology, there is great uncertainty and uncontrollability in whether the diversion can be realized, and there is no effective and feasible method at present

Method used

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  • Oil-gas-well hydraulic-fracturing down-hole low-frequency hydraulic-pulse generating device
  • Oil-gas-well hydraulic-fracturing down-hole low-frequency hydraulic-pulse generating device
  • Oil-gas-well hydraulic-fracturing down-hole low-frequency hydraulic-pulse generating device

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Embodiment Construction

[0020] The present invention will be further described below in conjunction with accompanying drawing. Embodiments of the present invention include, but are not limited to, the following examples.

[0021] refer to figure 1 , an oil and gas well hydraulic fracturing downhole low-frequency hydraulic pulsation generating device, comprising a composite cone cylinder assembly 2, and an upper joint 1 and an upper joint 1 disposed on the upper end of the composite cone cylinder assembly 2 and processed with API standard oil pipe connecting threads. The lower end of the composite cone cylinder assembly 2 is processed with an API standard oil pipe connection thread lower joint 7, the composite cone cylinder assembly 2 is provided with a matching composite cone piston 3, and the composite cone piston 3 is set There is a through hole 4, which can overcome the impact of the water hammer effect caused by the upward closing of the compound cone piston, and at the same time ensure that the...

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Abstract

An oil-gas-well hydraulic-fracturing down-hole low-frequency hydraulic-pulse generating device comprises a composite frustum cylinder body assembly, an upper connector and a lower connector, wherein the upper connector is arranged at the upper end of the composite frustum cylinder body assembly, and the lower connector is arranged at the lower end of the composite frustum cylinder body assembly. A composite frustum plunger matched with the composite frustum cylinder body assembly is arranged in the composite frustum cylinder body assembly, a through-hole is formed in the composite frustum plunger, and semi-circular grooves used for preventing sand blocking are evenly distributed on the periphery of the composite frustum plunger; and a reset spring is arranged on the lower portion of the composite frustum plunger, and a bearing seat is arranged at the lower end of the reset spring. After the up-down differential pressure of the composite frustum plunger reaches a certain value, operating liquid descends to compress the reset spring, when the composite frustum plunger descends, the flow area on the periphery of the composite frustum plunger gradually increases, the up-down differential pressure of the composite frustum plunger decreases, and the reset spring pushes the composite frustum plunger to ascend; and thus, reciprocating type vibration is generated, and low-frequency hydraulic pulse is generated in output fracturing fluid. According to the oil-gas-well hydraulic-fracturing down-hole low-frequency hydraulic-pulse generating device, based on the working displacement range of the hydraulic-fracturing operation, low-frequency hydraulic-pulse output of a hydraulic driving mode is achieved, and the hydraulic-fracturing effect can be improved on the whole.

Description

technical field [0001] The invention relates to downhole tools for hydraulic fracturing operations in oil and gas field reservoirs, in particular to a low-frequency hydraulic pulsation generating device for downhole hydraulic fracturing of oil and gas wells. Background technique [0002] In the development of oil and gas fields, hydraulic fracturing technology is an important measure to increase oil and gas production in tight reservoirs. [0003] At present, in the fracturing of oil and gas reservoirs, there are some technical problems that need to be solved urgently in conventional hydraulic fracturing technology stimulation technology. [0004] The generation of artificial hydraulic fractures mainly depends on the pressure of the fracturing fluid in the wellbore to cause tensile failure of the wellbore and reservoir rocks, to initiate and extend the fractures. The initiation of artificial fractures is mainly affected by the fracture pressure of the formation, and the dir...

Claims

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Application Information

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IPC IPC(8): E21B43/26
CPCE21B43/26
Inventor 聂翠平韩继勇胥元刚王俊奇
Owner XI'AN PETROLEUM UNIVERSITY
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