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Metal standard substance for testing low or ultralow permeability

A technology of ultra-low permeability and standard products, which is applied in the field of standard products for testing instrument calibration, and can solve problems such as low permeability, limited use of standard products, and high cost of use

Pending Publication Date: 2020-04-17
NAT RESERACH CENT OF GEOANALYSIS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Among the existing standard products on the market, the permeability values ​​are 0.40md, 1.0md, 0.60md, 100md, 200md, 300md, 500md and 2000md-3000md, but because most of the standard products are purple sand mud, quartz sand and talcum powder, etc. The artificial rock core pressed after proportioning has a high permeability value of the standard product, so it can only be applied to high permeability sample testing instruments and testing methods, such as mercury porosimetry permeability testing, but for low permeability or ultra-low permeability (e.g. a K-permeability of 10 -5 md-10 -3 md) sample test equipment and test methods are not applicable
And the permeability test is to fill the sample with forced liquid or gas. When the mercury porosimetry is filled with liquid, a standard product can only be tested once, and the use cost is very high. When using the pressure-covered hole nitriding gas adsorption method, additional The pressure will cause micro-cracks in the standard product, and the service life of the standard product is also very limited, which greatly limits the use of the standard product, resulting in most porosity and permeability tests in the industry at present. monitoring status

Method used

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  • Metal standard substance for testing low or ultralow permeability
  • Metal standard substance for testing low or ultralow permeability
  • Metal standard substance for testing low or ultralow permeability

Examples

Experimental program
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preparation example Construction

[0051] In some embodiments, the preparation method of the metal standard product further includes: grinding the side of the prepared standard product. Grinding makes the shape of the prepared standard more regular, thereby further improving the accuracy of measurement. It should be understood that the top and bottom surfaces of the prepared standards were not ground. If the top surface and the bottom surface of the prepared standard product are polished, it is easy to cause the pores on the top surface and the bottom surface to be blocked, which will affect the value of the permeability. In a specific embodiment, the gas permeability measurement is under the covering pressure, measuring the gas permeability in the vertical direction of the cylinder, and the surrounding air pressure is closed, so the side processing does not affect the value.

[0052] The metal standard product of the present invention is measured with a CMS-300 pressure-covered porosity tester from American C...

Embodiment 1

[0056] Using nickel powder with an average particle size of 2 μm as the raw material, a cylindrical standard product with a diameter of 2.5 cm, a height of 4.7 cm, and a compaction rate of 91.5% was produced. Porosity and permeability repeatability testing.

[0057] The production process of the metal standard is as follows:

[0058] 1) calculate the weight M of required nickel powder according to above-mentioned formula (1) 镍 178g;

[0059] 2) Add 178g of nickel powder into the mould, put it on the press, release the pressure when the nickel powder in the mold is pressed to a standard product height of 4.7cm, and take it out to obtain a molded semi-finished product;

[0060] 3) Put the molded semi-finished product into a vacuum sintering furnace, sinter at 900°C for 1 hour, take it out after cooling, and obtain a nickel standard product.

[0061] Testing of nickel standard product: The porosity and K-permeability of the nickel standard product prepared in this embodiment w...

Embodiment 2

[0070] Using nickel powder with an average particle size of 2 μm as the raw material, a cylindrical standard product with a diameter of 2.5 cm, a height of 4.7 cm, and a compaction rate of 92% was produced. Porosity and permeability testing.

[0071] The production process of the metal standard is as follows:

[0072] 1) calculate the weight M of required nickel powder according to above-mentioned formula (1) 镍 180g;

[0073] 2) Add 180g of nickel powder into the mould, put it on the press, release the pressure when the nickel powder in the mold is pressed to a standard product height of 4.7cm, and take it out to obtain a molded semi-finished product;

[0074] 3) Put the molded semi-finished product into a vacuum sintering furnace, sinter at 900°C for 1 hour, take it out after cooling, and obtain a nickel standard product.

[0075] Testing of nickel standard product: The porosity and K-permeability of the nickel standard product prepared in this embodiment were repeatedly m...

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Abstract

The invention provides a metal standard substance for testing low or ultralow permeability. The metal standard substance is prepared by mould pressing and sintering of metal powder, and when the metalstandard substance is measured under the measurement confining pressure of 1000 psi to 5000 psi, the Klinkenberg permeability is 2*10<-4> to 20 md. The metal standard substance for testing low or ultralow permeability can be used for calibrating a permeability test instrument, can be repeatedly used, and is long in service life and low in cost.

Description

technical field [0001] The invention relates to a standard product for calibrating test instruments, in particular to a metal standard product used for low or ultra-low permeability testing. Background technique [0002] At present, the test method for low or ultra-low permeability is mainly the unsteady-state measurement method under overburden pressure. During the test, it is necessary to apply a high confining pressure to the sample to be tested, and use the principle of pressure pulse attenuation to calculate the K-permeability of the sample. . However, there is a lack of standard substances in the market to check and calibrate the instrument before the test, and to monitor the status of the instrument and the validity of the test data during the test. [0003] Among the existing standard products on the market, the permeability values ​​are 0.40md, 1.0md, 0.60md, 100md, 200md, 300md, 500md and 2000md-3000md, but because most of the standard products are purple sand mud...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/08G01N1/36G01N1/28G01N1/44
CPCG01N15/0806G01N1/36G01N1/286G01N1/44G01N2001/366
Inventor 秦婧孙玮琳许智超杨佳佳汪双清沈斌徐学敏张小涛黄春华栗敏
Owner NAT RESERACH CENT OF GEOANALYSIS
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