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High-fidelity heterogeneous conglomerate artificial core and manufacturing method thereof

A technology of artificial cores and manufacturing methods, which is applied in the preparation of test samples, analysis of suspensions and porous materials, instruments, etc., can solve problems such as difficult to obtain reliable results, poor artificial conglomerate cores, and poor production, and achieve Improved accuracy and good toughening effect

Pending Publication Date: 2022-05-13
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the experimental research of oil and gas field development, it is necessary to use a large number of cores to conduct formation seepage simulation experiments, to study formation dynamic changes, oil production medium changes, oil recovery mechanisms, reservoir damage mechanisms, and evaluation of development effects during reservoir development. Due to the mixed size of gravel particles, strong heterogeneity, and poor physical properties of the reservoir, the corresponding artificial conglomerate cores are not easy to make, and the pore structure is not easy to grasp. It is difficult to obtain reliable results in experiments.

Method used

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  • High-fidelity heterogeneous conglomerate artificial core and manufacturing method thereof
  • High-fidelity heterogeneous conglomerate artificial core and manufacturing method thereof
  • High-fidelity heterogeneous conglomerate artificial core and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0089] This implementation provides a method for making a high-fidelity heterogeneous conglomerate artificial core for experiments, the steps are as follows:

[0090] Step 1: Analyze the particle size of a certain well area of ​​the natural rock core to obtain a statistical table of its particle size content, as shown in Table 5 below:

[0091] Table 5 Statistics of core particle size in a certain well area

[0092]

[0093] According to the particle size content obtained from the analysis, mixed sands of different particle sizes are prepared in advance and fully mixed to obtain mixed sands, and 10% of the mass of the mixed sands is added to the formation water of the corresponding formation for wetting and stirring evenly.

[0094] Step 2: Preheat 5% epoxy resin relative to the total mass of the mixed sand at a preheating temperature of 60°C and 1.5 hours in advance, and 45% diluent and 8% plasticizer relative to the volume of epoxy resin and 9% curing agent, add it into ...

Embodiment 2

[0100] The difference from Example 1 is:

[0101] 10% epoxy resin relative to the total mass of the mixed sand, 15% plasticizer and 6% curing agent relative to the volume of epoxy resin 25% diluent, preheated 2 hours in advance at a preheating temperature of 80°C, Add to a 5000mL glass beaker and stir well to make a cement.

Embodiment 3

[0103] The difference from Example 1 is:

[0104] Step 1: adding formation water to be 15% of the mass of the mixed sand.

[0105] Step 2: Add 12% epoxy resin to the total mass of mixed sand preheated 2 hours in advance, 25% diluent, 17% plasticizer and 5% curing agent to the volume of epoxy resin, and add 5000mL glass Beaker, stir well to make cement.

[0106] Step 3: Fully stir and mix the cement prepared in Step 2 with the mixed sand to make it uniform, and fill it in the mold evenly in 5 times. The mass of natural core cuttings is 1% of the mass of mixed sand.

[0107] Step 5: Place the pressed artificial core at room temperature for 10 hours, then disassemble the mold and take out the artificial core.

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Abstract

The invention discloses a high-fidelity heterogeneous conglomerate artificial core and a manufacturing method thereof.The manufacturing method includes the steps that S1, local air setting sand, local riverbed sand and quartz powder of different particle fractions are mixed to form mixed sand, formation water of a corresponding stratum is added into the mixed sand and stirred to be uniform, and the mass of the formation water accounts for 2-15% of that of the mixed sand; s2, uniformly mixing a diluent, epoxy resin, a plasticizer and a curing agent to prepare a cementing agent; the mass of the epoxy resin is 4-12% of the mass of the mixed sand, the mass of the plasticizer is 6-17% of the mass of the epoxy resin, the mass of the curing agent is 5-15% of the mass of the epoxy resin, and the mass of the diluent is 15-65% of the mass of the epoxy resin; and S3, adding the cementing agent into the mixed sand, uniformly stirring, pressing in a mold, and molding to obtain the artificial rock core. The manufactured artificial rock core is closer to a natural rock core, so that the accuracy of an indoor simulation experiment is improved.

Description

technical field [0001] The invention belongs to the field of artificial rock cores, and relates to a high-fidelity heterogeneous conglomerate artificial rock core and a manufacturing method thereof. Background technique [0002] In the experimental research of oil and gas field development, it is necessary to use a large number of cores to conduct formation seepage simulation experiments, to study formation dynamic changes, oil production medium changes, oil recovery mechanisms, reservoir damage mechanisms, and evaluation of development effects during reservoir development. Due to the mixed size of gravel particles, strong heterogeneity, and poor physical properties of the reservoir, the corresponding artificial conglomerate cores are not easy to make, and the pore structure is not easy to grasp, so it is difficult to obtain reliable results in experiments. Contents of the invention [0003] The purpose of the present invention is to overcome the above-mentioned shortcomin...

Claims

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Application Information

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IPC IPC(8): G01N1/28G01N15/08
CPCG01N1/28G01N15/082
Inventor 靳军张远凯王蓓叶义平寇根王子强周伟李琼郭慧英魏云刘赛李震张国山于贵海
Owner PETROCHINA CO LTD
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