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A microscopic visualization model of artificial rock core and its preparation method and application

An artificial core and model technology, which is applied in the field of artificial core micro-visualization model and its preparation, can solve the problems of pore-throat differences and achieve high pressure resistance, superior pressure resistance, and clear imaging

Active Publication Date: 2021-01-01
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to solve the problem that there are significant differences between the existing rock core visualization model and the actual rock pore throat, the purpose of the present invention is to provide a microscopic visualization model of artificial rock core and its preparation method; the microscopic visualization model of artificial rock core prepared by the preparation method has the same characteristics as real The pore-throat structure is similar to the rock, and the pressure bearing capacity is strong, and the imaging is clear

Method used

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  • A microscopic visualization model of artificial rock core and its preparation method and application
  • A microscopic visualization model of artificial rock core and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] This implementation provides a method for preparing a microscopic visualization model of an artificial rock core, which includes the following steps:

[0054] Step 1. Stir and mix the high-strength and high-transparency resin glue, magnesium hydroxide and quartz sand evenly, pour it into a rectangular groove container for ventilation and curing, and perform ultrasonic pickling on the cured mixture sheet, take it out and dry it, and cut it according to the designed size Obtain artificial core pieces;

[0055] Step 2, cutting the plexiglass substrate according to the designed size, and drilling through holes at the designed inlet and outlet positions;

[0056] Step 3, the artificial core piece is pasted on the pre-bonded area of ​​the plexiglass substrate by double-sided adhesive tape;

[0057] Step 4, using a mixture of high-viscosity long-chain molecular epoxy resin and epoxy curing agent to cast the artificial core piece and the plexiglass matrix;

[0058] Step 5: Dr...

Embodiment 2

[0064] This embodiment provides a specific artificial rock core microscopic visualization model (such as figure 1 Shown) and preparation method thereof, its preparation method comprises the following steps:

[0065] (1) Preparation of artificial rock core sheet:

[0066] Mix high-strength and high-transparency resin glue (a mixture of medium-viscosity bisphenol A epoxy resin DER336 and 593 epoxy curing agent in a mass ratio of 5:1) with 55%, 20% and 25%, 270 mesh Magnesium hydroxide powder and quartz sand (80 mesh accounts for 50%, 160 mesh accounts for 30%, and 270 mesh accounts for 20%). Stir the mixture with a polytetrafluoro rod, so that magnesium hydroxide and quartz sand are evenly mixed in the resin glue Then slowly pour the mixture into a rectangular groove container with a depth of 1mm (the length and width of the container are 10cm and 5cm respectively), stop pouring when the liquid level of the mixture is flush with the four sides of the groove, and then pour the ...

Embodiment 3

[0078] This implementation provides the artificial rock core microscopic visualization model prepared in the above-mentioned Example 2 for the gas drive water experiment.

[0079] The core of the natural early core visualization model was evacuated and saturated with dyed formation water, and then the gas drive water experiment was carried out at a speed of 0.1mL / min. During the experiment, relevant pictures were taken, from figure 2 It can be seen that after gas drives water, the distribution of gas and water inside the core changes significantly. During the experiment, the model can still inject and produce normally when the pressure is 2MPa. After the displacement experiment is over, in order to test the ultimate failure pressure, the production end is closed and the gas injection is continued. The measured ultimate failure pressure is 3MPa.

[0080] The artificial rock core microscopic visualization model in this embodiment is applied to the study of fluid seepage law and...

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Abstract

The invention provides an artificial core microscopic visualization model, and a manufacturing method and an application. The method comprises the following steps of stirring and uniformly mixing a high-strength and high-light-transmission resin glue, magnesium hydroxide and quartz sand, pouring into a rectangular groove for ventilation and solidification, then carrying out ultrasonic pickling, and drying and cutting to acquire an artificial core sheet; cutting the plexiglass substrate and drilling through holes at inlet and outlet positions; pasting the artificial core sheet to the pre-bondedarea of the substrate through a double-sided adhesive tape; using the mixture of a high viscosity long chain molecular epoxy resin and an epoxy curing agent to cast the artificial core sheet and thesubstrate; and drilling through the middle double-sided adhesive tape from the through hole of the bottom surface which is not casted of the substrate, installing a valve and a valve pedestal in the drilling hole of the bottom surface which is not casted of the substrate, and acquiring the artificial core microscopic visualization model. The microscopic pore throat structure of the model approaches a real core. The advantages that a manufacturing technology is simple, pressure resistance performance is excellent, light transmission performance is good, imaging is clear and so on are possessed.The model and the method can be applied to the study of a fluid seepage law and a mechanism in a porous medium.

Description

technical field [0001] The invention belongs to the technical field of oil and gas reservoir development, and in particular relates to an artificial rock core microscopic visualization model and a preparation method and application thereof. Background technique [0002] In the process of oil and gas reservoir development, microscopic visualization experiments are widely used to study the law and mechanism of fluid seepage in porous media. As the carrier of microscopic experiments, the microscopic visualization model is very important for the study of fluid microscopic seepage law. At present, for different research objectives, scholars have proposed a variety of microscopic visualization models, which can be mainly divided into: lithography microscopic visualization models, artificial core visualization models, microfluidic chip visualization models, and natural core visualization models according to materials and manufacturing processes. Thin slice visualization model and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09B25/00
CPCG09B25/00
Inventor 焦春艳李熙喆卢祥国胡勇谢坤万玉金郭长敏徐轩朱秋影张玉丰王继平梅青燕陈颖莉张楷
Owner PETROCHINA CO LTD
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