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Method and system for determining gas-water imbibition condition in porous medium

A porous medium and water infiltration technology, applied in the field of oil and gas exploration and development, can solve the problem of inability to obtain the imbibition of porous medium, and achieve the effect of accurate measurement

Pending Publication Date: 2021-07-20
PETROCHINA CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the above-mentioned technical problems, an object of the present invention is to provide a method for determining the gas-water imbibition inside the porous medium; the method uses layered nuclear magnetic resonance testing for the first time, which overcomes the volumetric and gravimetric research in the prior art. Insufficiency of imbibition at different locations within porous media cannot be obtained

Method used

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  • Method and system for determining gas-water imbibition condition in porous medium
  • Method and system for determining gas-water imbibition condition in porous medium
  • Method and system for determining gas-water imbibition condition in porous medium

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Embodiment 1

[0095] This embodiment provides a system for determining the intensity of air-water imbibition and water saturation in porous media, the system includes an air-water imbibition replacement device, a weighing device, and a low-field nuclear magnetic resonance imaging device, wherein:

[0096] The air-water imbibition replacement device includes a water tank and a rock core suspension frame. In use, the porous medium is suspended on the rock core suspension frame, and one end of the porous medium is immersed in water in the water tank for air-water imbibition displacement, such as figure 1 shown;

[0097] The weighing device is a high-precision electronic balance for weighing porous media;

[0098] The low-field nuclear magnetic resonance imaging device is a low-field nuclear magnetic resonance instrument, which is used to perform low-field nuclear magnetic resonance imaging on rock cores, and perform layered nuclear magnetic resonance tests to obtain layered T 2 Spectrum.

Embodiment 2

[0100] This embodiment provides a method for measuring the gas-water imbibition rate and saturation profile inside a porous medium. The flow of the method is as follows figure 2 As shown, it specifically includes the following steps:

[0101] S101. Pretreatment of rock core samples to be tested:

[0102] According to the standard determination method of relative permeability of two-phase fluid in rock (SY / T 5345-2007), the core sample to be tested (i.e. porous medium) is dried until Sw is 0, and its weight, porosity, permeability and length are measured, and the result As shown in Table 1;

[0103] Table 1

[0104]

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Abstract

The invention provides a method and system for determining the gas-water imbibition condition in a porous medium. The method comprises the following steps: 1) respectively carrying out nuclear magnetic resonance layering test on a porous medium in a completely saturated water state and a porous medium in a water-free state to obtain corresponding layering T2 spectrums; 2) immersing one end of the porous medium with the water content of 0 or the preset irreducible water saturation into water, and carrying out gas-water imbibition replacement; before the porous medium is immersed in water, performing nuclear magnetic resonance layering test on the porous medium to obtain a corresponding layering T2 spectrum; performing the nuclear magnetic resonance layering test on the porous medium within a preset imbibition time to obtain a corresponding layering T2 spectrum; repeatedly carrying out gas-water imbibition replacement and testing to obtain a layering T2 spectrum of the porous medium at each preset imbibition time; stopping gas-water imbibition replacement and testing until the layering T2 spectrum does not change; and 3) determining the water saturation distribution of different layers in the porous medium at different moments according to the layered T2 spectrum so as to represent the gas-water imbibition condition in the porous medium.

Description

technical field [0001] The invention relates to the technical field of oil and gas exploration and development, in particular to a test method and system for gas-water imbibition inside a porous medium. Background technique [0002] In porous media, the process of the wetting phase fluid displacing the non-wetting phase fluid by capillary force is called imbibition, which is a common multiphase flow phenomenon under the action of capillary force. In the field of oil and gas development, both oil-water imbibition and gas-water imbibition have an important impact on the development effect. In the water flooding development of reservoirs, imbibition phenomenon is common. In the development of gas reservoirs, imbibition also has a huge impact, and the water control development of gas reservoirs is an important measure to enhance oil recovery. Due to the gas-water imbibition in the reservoir, especially the fracture-matrix gap during the process of fracture water invasion Gas-w...

Claims

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Application Information

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IPC IPC(8): G01N24/08G01N5/02
CPCG01N24/081G01N5/02G01N13/04Y02A90/30
Inventor 徐轩万玉金胡勇焦春艳梅青燕陈颖莉石石郭振华郭长敏郭辉
Owner PETROCHINA CO LTD
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