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Rock permeability standard substance and preparation method thereof

A standard material and permeability technology, which is applied in the direction of permeability/surface area analysis, preparation of test samples, analysis of suspensions and porous materials, etc., can solve problems such as unsatisfactory compact sandstone, and achieve controllable appearance and repeatability Good, wide range of permeability effects

Pending Publication Date: 2022-06-21
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a rock permeability standard material and its preparation method in view of the fact that the existing permeability standard material cannot meet the requirements for permeability calibration of ultra-low permeability reservoirs such as tight sandstone and shale

Method used

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  • Rock permeability standard substance and preparation method thereof
  • Rock permeability standard substance and preparation method thereof

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preparation example Construction

[0022] One aspect of the present invention provides a method for preparing a rock permeability standard substance, characterized in that the method comprises the following steps:

[0023] S1: By establishing the calculation method of rock gas permeability, the formula for calculating rock gas permeability is obtained;

[0024] S2: According to the formula for calculating the rock gas permeability, obtain the formula for calculating the diameter of the through hole for preparing the rock permeability standard material;

[0025] S3: According to the target gas permeability, the diameter of the columnar core, and the number of target through-holes, calculate the through-hole diameter for preparing the rock permeability standard material;

[0026] S4: The preparation of the through hole includes drilling the impermeable cylinder directly according to the through hole diameter obtained in step S3, or, after drilling the impermeable cylinder, implanting in each hole a capillary, th...

Embodiment

[0055] This embodiment provides a preparation method of rock permeability standard material, such as figure 1 As shown, the method includes the following steps:

[0056] S1: By establishing the calculation method of rock gas permeability, the formula for calculating rock gas permeability is obtained;

[0057] S2: According to the formula for calculating the rock gas permeability, obtain the formula for calculating the diameter of the through hole for preparing the rock permeability standard material;

[0058] S3: According to the target gas permeability 2.97×10 -5 mD, the diameter of the columnar core is 2.54cm, the number of target through holes is 1, and the diameter of the through holes for preparing the rock permeability standard material is calculated;

[0059] In step S1, the method for calculating the rock gas permeability is to use the gas Darcy formula and the Poji leaf formula to derive the formula for calculating the rock gas permeability. in,

[0060] The gas D...

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Abstract

The invention belongs to the field of oil and gas reservoir geology and development, and discloses a rock permeability standard substance and a preparation method thereof. According to the method, a formula for calculating the rock gas permeability is obtained by establishing a calculation method for the rock gas permeability, a formula for calculating the diameter of a through hole for preparing the rock permeability standard substance is further obtained, the diameter of the through hole is further obtained, a non-permeable cylinder is drilled or a capillary tube is implanted after drilling, and the rock permeability standard substance is obtained. The capillary tube and the column body are glued and sealed by epoxy resin and other materials; and finally, metal filter screens are mounted at the two ends of the column body. The permeability standard substance prepared according to the method has a wide permeability range, can measure both high permeability and low permeability, especially can measure Ndarcy-level permeability, and is especially suitable for tight sandstone and shale permeability measurement and calibration.

Description

technical field [0001] The invention belongs to the field of oil and gas reservoir geology and development, and more particularly relates to a rock permeability standard substance and a preparation method thereof. Background technique [0002] The commercial standard materials currently used in the field of oil and gas reservoir development can calibrate the porosity and permeability, in which the test porosity ranges from 3% to 30%, and the permeability test ranges from 0.1 mD to thousands of mD. At present, the research objects of oil and gas reservoirs at home and abroad have been extended to low-porosity and ultra-low permeability reservoirs such as tight sandstone and mud shale. The porosity usually does not exceed 10%, and the minimum permeability has reached several Nadaxi levels. The porosity reference material can still meet the needs, while the lower limit of the permeability reference material is far from meeting the needs of tight rock permeability verification. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/28G01N15/08
CPCG01N1/28G01N15/0806
Inventor 赵春鹏伦增珉吕成远崔茂蕾王海涛刘华
Owner CHINA PETROLEUM & CHEM CORP