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Rock core holder and molecular diffusion coefficient testing system and method

A technology of core holder and molecular diffusion, which is applied in the direction of instruments, measuring devices, scientific instruments, etc., can solve the problems of inaccurate pressure change measurement and inability to simulate reservoir conditions, so as to reduce experimental measurement errors, accurate experimental data, Accurate and reliable experimental data

Active Publication Date: 2021-10-26
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the pressure drop experiment is carried out in a closed tank, which has the problems of being unable to simulate reservoir conditions and measuring inaccurate pressure changes

Method used

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  • Rock core holder and molecular diffusion coefficient testing system and method
  • Rock core holder and molecular diffusion coefficient testing system and method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] refer to figure 1 As shown in the schematic diagram of the structure of the present invention, Embodiment 1 of the present invention provides a core holder, including: a housing 1 with a sealed hollow cavity; a partition 11 arranged in the hollow cavity to divide the hollow cavity into a first cavity body and the second cavity; the first opening 121 and the second opening 131 are symmetrically opened on the shells on both sides of the partition, the first opening 121 communicates with the first cavity, and the second opening 131 communicates with the second The cavity is connected; the first elastic sleeve 14 is connected between the first opening 121 and the partition 11, the first elastic sleeve 14 and the partition 11 are vertically arranged, and the outer circumference of the first elastic sleeve 14, the inner wall surface of the housing 1 and the The wall surface of the partition 11 forms the first confining fluid accommodation area 100; the second elastic sleeve 1...

Embodiment 2

[0054] refer to figure 2 As shown in the structural diagram of the present invention, on the basis of the first embodiment above, the second embodiment of the present invention provides a molecular diffusion coefficient test system, the molecular diffusion coefficient test system includes the above-mentioned core holder; the auxiliary test piece is a diffusion The cavity 2 has an inlet and an outlet, and contains a diffusion medium inside, and the outlet corresponds to the side that is in contact with the partition 11; the end face of the core 3 to be clamped against the partition is the injection end, and the end face of the core 3 to be clamped away from the partition is The back pressure end; the molecular diffusion coefficient testing system also includes: a first injection system 4, connected to the entrance of the diffusion chamber 2, for injecting the diffusion medium; a first back pressure system 5, connected to the back pressure end of the rock core 3 to be clamped, u...

Embodiment 3

[0063] On the basis of the second embodiment above, the third embodiment of the present invention provides a molecular diffusion coefficient testing method, which includes the above-mentioned molecular diffusion coefficient testing system.

[0064] Specifically, the molecular diffusion coefficient test methods include:

[0065] Assembling the system; wherein, in the step of assembling the system, the diffusion chamber 2 composed of a preset number of column tubes is included in the first elastic sleeve 14, the rock core 3 to be clamped is loaded into the second elastic sleeve 15, and the installation The first clamping part and the second clamping part are used to clamp against the diffusion chamber 2 and the rock core 3 to be clamped; respectively connect the first injection system 4, the pressure monitoring system 43, the first back pressure system 5, and the confining pressure system 7. The second injection system 6, the second back pressure system 63 and the control system...

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Abstract

The invention provides a core holder, and a molecular diffusion coefficient testing system and method. The core holder comprises a shell with a sealed hollow cavity; a partition dividing the hollow cavity into a first cavity body and a second cavity body; a first open hole, communicated with the first cavity, a second open hole, communicated with the second cavity; a first elastic sleeve, connected between the first opening and the partition, and a first confining pressure liquid containing area being defined by the periphery of the first elastic sleeve, the inner wall face of the shell and the wall face of the partition; a second elastic sleeve, connected between the second opening and the partition, and a second confining pressure liquid containing area being defined by the periphery of the second elastic sleeve, the inner wall face of the shell and the wall face of the partition; an experiment channel, formed in the partition; a first clamping piece entering and exiting from the first elastic sleeve; and a second clamping piece entering and exiting from the second elastic sleeve. The actual condition of a reservoir can be simulated, the temperature change of the whole system is maintained, the change of pressure in the diffusion cavity in the pressure drop experiment process is monitored in real time, and the experiment measurement error is reduced.

Description

technical field [0001] The invention relates to the technical field of oilfield exploitation, in particular to a rock core holder, a molecular diffusion coefficient testing system and a method. Background technique [0002] Carbon dioxide huff and puff is one of the ways to effectively develop shale reservoirs. Molecular diffusion is an important mechanism for shale reservoirs to increase crude oil production. Therefore, accurate acquisition of molecular diffusion coefficients is of great significance to enhance oil recovery of shale reservoirs. [0003] In the acquisition of diffusion coefficient, the method of pressure drop experiment is generally used. In order to obtain accurate experimental data, the actual state of the reservoir must be simulated during the experiment and the temperature change of the entire system must be maintained to accurately measure the pressure change. At present, the pressure drop experiment is carried out in a closed tank, which has the proble...

Claims

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Application Information

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IPC IPC(8): G01N13/00
CPCG01N13/00Y02P90/70
Inventor 陈浩杨明洋黄尘缘王宇左名圣张超杨冉唐建东
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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