Testing device of shale suction capacity under confining pressure and test method thereof

A testing device and testing method technology, applied in the direction of measuring device, suspension and porous material analysis, instruments, etc., to achieve the effect of increasing volume, improving fracturing effect, and improving the effect of post-fracture stimulation

Inactive Publication Date: 2018-04-17
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the above-mentioned existing testing devices and methods cannot perform confining pressure testing, and the present invention provides a testing device and testing method for shale self-priming ability under confining pressure

Method used

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  • Testing device of shale suction capacity under confining pressure and test method thereof
  • Testing device of shale suction capacity under confining pressure and test method thereof
  • Testing device of shale suction capacity under confining pressure and test method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A test device for shale self-absorption capacity under confining pressure described in this embodiment, such as figure 1 shown, including:

[0029] The formation confining pressure simulation device includes a core holder 2 for clamping the shale rock column 1, a sealing device 3 for sealing both ends of the shale rock column 1, and a confining pressure mechanism connected with the core holder 2 ;

[0030] The liquid supply device includes a metering mechanism connected in series with the sealing device 3 through a hose 4, and a liquid injection pipe 5 connected in series with the sealing device 3 and in parallel with the flexible pipe 4, and the liquid injection pipe 5 is provided with There is a valve 6, and the liquid injection pipe 5 and the metering mechanism are located on the same side of the sealing device 3 .

[0031] When testing, the rock pillar to be tested can be put into the confining pressure device, fixed by the core holder 2, sealed by the sealing dev...

Embodiment 2

[0033] Based on Example 1, such as figure 1 As shown, the bottom of the core holder 2 is also provided with a stand 7 . The confining pressure device can be fixed through the stand 7 while maintaining the level of the shale rock column 1 to reduce test errors.

Embodiment 3

[0035] Based on Example 1, such as figure 1 As shown, the confining pressure mechanism includes a screw pump 8 and a pressurizing pipeline 9 connected to the screw pump 8 , and the pressurizing pipeline 9 is connected to the core holder 2 . Using the screw pump 8 to add confining pressure to the shale rock column 1 can reduce the error of the test result by the confining pressure device and better simulate the real formation pressure environment.

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Abstract

The invention discloses a testing device of shale suction capacity under confining pressure and a test method thereof. The testing device comprises a stratum confining pressure stimulator and a fluidsupply device, wherein the stratum confining pressure stimulator comprises a rock core holder used for clamping shale rock pillars, a sealing device used for sealing two ends of a shale rock pillar and a confining pressure adding mechanism connected to the rock core holder; the fluid supply device comprises a metering mechanism which is connected in series with the sealing device through a flexible pipe and a liquid injection pipe which is connected in series with the sealing device and connected in parallel with the flexible pipe; the liquid injection pipe is provided with a valve; and the liquid injection pipe and the metering mechanism are positioned at the same side of the sealing device. According to the invention, testing with confining pressure can be realized, and effective basis is provided for understanding the shale suction capacity under confining pressure of true stratum so as to guide optimization of a fracturing fluid and optimization of a fracturing fluid flow-back system.

Description

technical field [0001] The invention relates to the technical field of shale self-absorption testing for hydraulic fracturing of shale gas reservoirs, in particular to a testing device and a testing method for shale self-absorption capacity under confining pressure. Background technique [0002] With the deepening of exploration and development of oil and gas resources, shale gas has become a hot spot in exploration and development. Due to extremely low permeability and porosity, shale gas reservoirs must rely on large-scale hydraulic fracturing for effective development. Practices at home and abroad have found that the lower the flowback rate of shale gas reservoirs after fracturing, the higher the gas production after fracturing; the mechanism is that after shale absorbs water, the internal structure of shale has improved, and some tiny cracks have formed. Related experiments have also found this phenomenon. [0003] At present, shale self-priming experiments are carried...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/08
CPCG01N15/0806G01N15/0826
Inventor 赵志红郭建春卢聪陈迟张晗
Owner SOUTHWEST PETROLEUM UNIV
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