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Experimental facility for integrity of fractured horizontal shaft

A horizontal wellbore and experimental device technology, applied in the direction of wellbore/well components, measurement, construction, etc., can solve the problems of not considering the influence of the integrity of the horizontal wellbore, and achieve the effect of improving the integrity of the wellbore and improving the service life of the wellbore

Inactive Publication Date: 2017-05-24
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

Current research mostly focuses on the influence of in-situ stress on casing damage, without considering the influence of fracturing pressure load and high temperature on the integrity of horizontal wellbore

Method used

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  • Experimental facility for integrity of fractured horizontal shaft

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Embodiment Construction

[0029] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation manners of the present invention will now be described with reference to the accompanying drawings.

[0030] Such as figure 1 As shown, the present invention provides a fracturing horizontal wellbore integrity test device. The fracturing horizontal wellbore integrity test device includes a closed cavity 1 , and pressure sensors 2 are evenly distributed in the closed cavity 1 . The shape of the cavity 1 is preferably a rectangular cavity 1, the rectangular cavity 1 can simulate true triaxial stress, and the effect is better. A horizontal shaft 3 passes through the cavity 1 transversely, and the interior of the horizontal shaft 3 and the cavity 1 are isolated from each other by a tube wall. Perforation holes 4 and strain gauges 5 are provided on the wall of the horizontal wellbore 3, and the perforation holes 4 can simulate differ...

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Abstract

The invention relates to an experimental facility for integrity of a fractured horizontal shaft. The experimental facility for integrity of the fractured horizontal shaft mainly comprises a rectangular cavity, a heating device, an internal pressure device, a horizontal shaft and a seal detecting device. Bullet holes and artificial fracture models are distributed in the horizontal shaft at intervals. Pressure sensors are uniformly mounted in the rectangular cavity, and strain gauges are attached to the wall of the shaft. A heating bar is arranged in the rectangular cavity, and the heating bar in the rectangular cavity and a heating bar in the shaft form the heating device. An internal pressure pump applies pressure to the inside of the shaft through a pressure applying opening; a cement paste storage tank injects cement paste into the rectangular cavity through a liquid inlet; a high-pressure gas source applies high pressure to one end of the rectangular cavity, gas flow is measured at the other end to measure the sealing property of concrete blocks; and by a universal support, working conditions of different hole drift angles can be adjusted. Change conditions of shaft stress, cement internal stress distribution and integrity of the shaft can be simulated under the effects of fracture pressure and temperature of the horizontal shaft, and influence of combination of different hole types and different fracture types to the integrity of the shaft can also be simulated.

Description

technical field [0001] The invention relates to the research and testing of the integrity of the wellbore when fracturing a horizontal well in oil and gas well engineering, in particular to an experimental device for the integrity of a fracturing horizontal wellbore. Background technique [0002] Most of the oil and gas reservoirs exploited at present are low permeability oil and gas reservoirs. Most of the development wells are high-temperature and high-pressure fractured horizontal wells, and the fracturing technology is an effective development method for low-permeability oil and gas reservoirs. The fracturing operation of horizontal wells produces a large force on the casing-cement sheath-formation system, which affects the integrity of the horizontal wellbore. Integrity refers to the reliability of the sealing performance between the wellbore and the cement sheath. In the process of fracturing and post-development, the cracks generated by fracturing and the high temper...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/26E21B47/00E21B47/005E21B49/00
CPCE21B43/26E21B47/00E21B47/005E21B49/00
Inventor 李军张辉张鑫王昊董健姜敞谭天一
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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