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Method and device for determining pore parameters of rock cores by using computed tomography (CT) technology

A technology of tomography and computer, applied in measuring devices, suspension and porous material analysis, scientific instruments, etc., can solve problems such as mercury environmental pollution, damage to core structure, and inability to effectively characterize core porosity distribution characteristics

Inactive Publication Date: 2013-12-18
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Mercury porosimetry to study rock pore structure is one of the important means to study petrophysical properties in the petroleum industry, but this method has the following disadvantages: mercury pollutes the environment, and the tested core samples cannot be reused due to residual mercury. Test the macroscopic pore distribution properties of the core, and cannot study the pore distribution characteristics in detail
Other methods such as χ-ray diffraction, thin section identification, scanning electron microscopy and other analytical techniques can clearly identify the pore structure characteristics of the core, but the core structure is usually destroyed during the test process, and the porosity distribution characteristics of the core cannot be effectively characterized.

Method used

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  • Method and device for determining pore parameters of rock cores by using computed tomography (CT) technology
  • Method and device for determining pore parameters of rock cores by using computed tomography (CT) technology
  • Method and device for determining pore parameters of rock cores by using computed tomography (CT) technology

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Embodiment 1

[0089] In the embodiment of the present invention, by counting the porosity and pore radius data of 150 rock core samples in my country's Daqing, Liaohe, Jilin, and Changqing 4 sandstone oilfields, it is obtained as follows figure 2 The porosity versus pore radius regression curve of the core sample is shown. According to the regression curve, the empirical relationship between the core sample porosity and pore radius is obtained:

[0090] log r=-1.4358+0.08051×Φ correlation coefficient R=0.87581.

[0091] Among them, Φ represents the porosity; r represents the pore radius, and the unit is micron μm.

[0092] Thus, the calculation formula for calculating the pore radius distribution is obtained:

[0093] log r = - 1.4358 + 0.08051 CT w , r - CT ...

Embodiment 2

[0159] Figure 59 It is a schematic diagram of the composition of the device for measuring core pore parameters in Example 2 of the present invention. Such as Figure 59 As shown, the device 590 includes:

[0160] The first measurement unit 591, which uses computerized tomography technology to scan the dry core to obtain the CT value of each section of the dry core;

[0161] The second measurement unit 592, which uses computerized tomography technology to scan the saturated core after the formation water is saturated, and obtains the CT value of each section of the saturated core;

[0162] A pore radius acquisition unit 593, which acquires the pore radius of each section;

[0163] A matrix generation unit 594, which obtains the pore radius distribution matrix of each section according to the pore radius of each section.

[0164] In the embodiment of the present invention, the first measurement unit 591 may have a CT scanner, a core holder, a confining pressure system, an i...

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Abstract

The embodiment of the invention provides a method and a device for determining pore parameters of rock cores. The method comprises the following steps of respectively scanning a dry rock core and a saturated rock core saturated with formation water by using a computed tomography (CT) technology to obtain the CT value of each section of the dry rock core and the CT value of each section of the saturated rock core; acquiring the pore radius of each section according to a formula shown in the abstract, wherein CTa, r represents the CT value of each section of the dry rock core, CTair represents the CT value of air, C, r represents the CT value of the saturated rock core, CTwater represents the CT value of the formation water, xi represents the pore radius of each section, and the unit of the pore radius is micron; acquiring a pore radius distribution matrix of each section according to the pore radius of each section. Through the method, the throat size distribution of the rock cores can be intuitively reflected on the premise that the external forms and internal structures of the rock cores are not changed; the pore structure distribution of the rock cores is quantitatively characterized; the penetration law of the rock cores is accurately researched.

Description

technical field [0001] The embodiment of the present invention relates to a method for measuring the distribution of core pores, and in particular to a method and device for testing core pore parameters using computerized tomography (CT, Computed Tomography). Background technique [0002] The pore structure of the reservoir refers to the geometric shape, size, distribution and interconnection of the pores and throats in the rock, that is, the general appearance of the pores and throats in the reservoir. The quality of sandstone reservoir performance mainly depends on pore structure, that is, pore type, distribution, size and connectivity of throats, etc. When fluid flows along the reservoir pore system, it goes through a series of alternating pores and throats. The size and distribution of throats and their geometry are the main factors affecting the storage capacity and permeability characteristics of reservoirs, so determining the size distribution of throats is the core ...

Claims

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Application Information

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IPC IPC(8): G01N15/08
Inventor 高建马德胜刘庆杰杨司玉吕静康浩
Owner PETROCHINA CO LTD
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