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Downhole low-frequency hydraulic pulsation coupled hydraulic ultrasound generation system applied to injection augmentation of low-permeability reservoirs

A generation system and hydraulic technology, applied in the direction of wellbore/well components, production fluid, earthwork drilling and production, etc., can solve the problems of short validity period and difficult injection, and achieve the effect of low cost, convenient implementation and enhanced recovery

Active Publication Date: 2017-09-12
XI'AN PETROLEUM UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But on the whole, these measures have a short validity period, and it is difficult to fundamentally solve the problem of difficult injection

Method used

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  • Downhole low-frequency hydraulic pulsation coupled hydraulic ultrasound generation system applied to injection augmentation of low-permeability reservoirs
  • Downhole low-frequency hydraulic pulsation coupled hydraulic ultrasound generation system applied to injection augmentation of low-permeability reservoirs
  • Downhole low-frequency hydraulic pulsation coupled hydraulic ultrasound generation system applied to injection augmentation of low-permeability reservoirs

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Embodiment Construction

[0033] 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.

[0034] refer to figure 1 , the downhole hydraulic ultrasonic coupling low-frequency hydraulic pulsation generating device of the low-permeability reservoir of the water injection well, including the upper and lower parts, the upper part is the low-frequency pulsation generating device, and the lower part is the hydraulic ultrasonic generating device;

[0035] Such as figure 1 , figure 2 , the low-frequency pulsation generating device includes a composite frustum cylinder assembly 2, and an upper joint 1 that is processed on the upper end of the composite frustum cylinder assembly 2 and has an API standard oil pipe connection thread and is arranged on the composite frustum cylinder assembly. The lower end of the assembly 2 is processed with an API standard oil pipe connection thre...

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Abstract

The invention discloses a downhole low-frequency hydraulic pulsation coupled hydraulic ultrasound generation system applied to injection augmentation of low-permeability reservoirs. The system comprises a low-frequency hydraulic pulsation generation part and a hydraulic ultrasound generation part, wherein the low-frequency hydraulic pulsation generation part mainly comprises a frustum-shaped cylinder assembly, a compound frustum-shaped piston matched with the frustum-shaped cylinder assembly, a returning spring and the like; the cylinder body, the piston and the returning spring form a hydraulic reciprocating vibration system for generating low-frequency hydraulic pulsation in water injection process of a water injection well; the hydraulic ultrasound generation part comprises a flowing channel nozzle and a vibrating reed and is used for generating ultrasound under hydraulic action of the injected water flow and applying the ultrasound to the reservoirs; the hydraulic ultrasound is capable of removing blockage of reservoirs close to the well wall; the low-frequency hydraulic pulsation is capable of effectively improving permeability of the reservoirs, reducing the surrounding flow of the injected water, improving the volumetric sweep efficiency and augmenting injection and assisting for increasing recovery ratio; the system is capable of outputting low-frequency hydraulic pulsation and hydraulic ultrasound of a hydraulic driving manner based on operation displacement range of the low-permeability water injection well, integrally augmenting injection and improving the recovery ratio.

Description

technical field [0001] The invention relates to downhole tools for water injection operations in low-permeability and ultra-low-permeability oil and gas field reservoirs, in particular to an underground low-frequency hydraulic pulsation coupled hydraulic ultrasonic generation system for enhanced injection in low-permeability reservoirs. Background technique [0002] In the development of oil and gas fields, water injection development is an important technical measure for oil and gas fields to maintain formation pressure and increase and stabilize production. No capacity. Reasonable injection is an important way to stabilize production and increase recovery. [0003] At present, in the water injection development of typical dissolved gas flooding low-permeability and ultra-low-permeability reservoirs, due to the low formation permeability and the inevitable injection water quality problems in the sewage reinjection, it may be caused by scaling near the wellbore wall and mec...

Claims

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Application Information

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IPC IPC(8): E21B43/20
CPCE21B43/20
Inventor 聂翠平胥元刚韩继勇刘清
Owner XI'AN PETROLEUM UNIVERSITY
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