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Ultra-low permeability measurer adopting sine pressure wave oscillation method

An ultra-low permeability, pressure wave technology, applied in permeability/surface area analysis, measurement devices, scientific instruments, etc., can solve problems such as long pressure pulse balance time, environmental factors, and no core holder design, and achieve Easy and fast loading and unloading

Active Publication Date: 2014-10-29
海安华达石油仪器有限公司
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  • Application Information

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Problems solved by technology

However, due to the long balance time of the pressure pulse during the decay process and the influence of environmental factors, the test data is unstable
[0006] 3) Everyone is exploring the instrument for measuring ultra-low permeability by sinusoidal pressure wave oscillation method. The current instrument has the following shortcomings: A. There is no special core holder designed for the characteristics of sinusoidal pressure wave oscillation, but using The conventional core holder used in oilfield scientific experiments was broken, which caused the test data to be distorted
F. There is no vacuum pump system in the pipeline process, so that there is residual gas in the process pipeline. Because the gas is highly compressible, the volume of this part of residual gas will change with the pressure in the instrument process pipeline. This makes the pressure wave at both ends of the measured core lose its authenticity

Method used

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  • Ultra-low permeability measurer adopting sine pressure wave oscillation method
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  • Ultra-low permeability measurer adopting sine pressure wave oscillation method

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Embodiment Construction

[0041] Such as figure 1 As shown, the sine pressure wave oscillation method ultra-low permeability tester of the present invention includes a triaxial pressure core holder (2), a columnar core (3), a sine pressure wave generator (4), a vacuum pump system (5 ), basic pressure booster pump (6), ring pressure / axial pressure booster pump (7), microcomputer (8) and constant value container (9),

[0042] The triaxial pressure core holder includes a floating plug (2-1), a fixed plug (2-2), a piston (2-3), a pressure cap (2-4), a rubber sleeve (3- 1) and the steel sleeve (3-2), the floating plug (2-1) and the fixed plug (2-2) are respectively fixed on the piston (2-3) and the pressure cap through the connection form of the quick bayonet (2-4), the outlet of the floating plug (2-1) and the outlet of the fixed plug (2-2) are connected through pipelines, and a ball valve (11) is connected in series in the middle;

[0043] There is a small hole in the center of the floating plug (2-1) o...

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Abstract

The invention provides an ultra-low permeability measurer adopting a sine pressure wave oscillation method. The ultra-low permeability measurer comprises a triaxial pressure rock core clamp (2), a rock core (3), a sine pressure wave generator (4), a vacuum pump system (5), a basic pressure boosting pump (6), an annular pressure / axial pressure boosting pump (7), a microcomputer (8) and a fixed-value container (9). The ultra-low permeability measurer adopting the sine pressure wave oscillation method has the technical effects of high test precision, stable performance, high repeating precision, high test speed and convenience and simplicity for operation, and the difficulty in measuring the ultra-low permeability of the rock core is solved.

Description

technical field [0001] The invention relates to a sine pressure wave oscillation method ultra-low permeability measuring instrument, which belongs to the technical field of petroleum equipment. Background technique [0002] The determination of ultra-low permeability of rock core is a recognized problem, and people are actively exploring and seeking an ideal testing instrument. [0003] The instruments currently used for permeability determination have the following deficiencies: [0004] 1) The instruments currently used for permeability measurement are generally designed and developed in accordance with Darcy's law. Experts believe that the ultra-low permeability has deviated from Darcy's law, and the measurement time is too long, and the environmental factors are too influential, so the test results are not ideal. [0005] 2) The pulse decay method is currently recognized as a method for ultra-low permeability testing. However, due to the long equilibrium time of the p...

Claims

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Application Information

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IPC IPC(8): G01N15/08
Inventor 钱荣兴钱如树
Owner 海安华达石油仪器有限公司
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