Method for making artificial rock core

A manufacturing method, technology of artificial rock core, applied in the field of petroleum exploration

Active Publication Date: 2015-03-25
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the existing technologies manufacture cores with different permeability, porosity and cementation degree by changing the sand mold, cement dosage and pressing pressure of the core. porosity, degree of cementation core

Method used

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  • Method for making artificial rock core
  • Method for making artificial rock core
  • Method for making artificial rock core

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The river sand with the same particle size distribution as the natural core is selected as the skeleton particles. Mix river sand, epoxy resin and formation water according to the ratio in Table 1, and stir evenly. Clean the inside of the mold, and fill each mold with the prepared mixture of river sand and epoxy resin; place the mold filled with sand under the hydraulic press, and after the mold position is adjusted, use the hydraulic press to press the mold at 4MPa for 5 minutes. After the pressure is stable, release the pressure; put the pressed mold into the oven, bake at 100°C for 2 hours, then raise the temperature to 190°C and bake for 1 hour, then turn off the oven, let it cool naturally to room temperature from Remove the core from the mold. The cementation degree of the rock is expressed by the cementation index, and the greater the cementation index, the higher the cementation degree. The porosity, permeability and cementation index of the core are shown in ...

Embodiment 2

[0025] The river sand with the same particle size distribution as the natural core is selected as the skeleton particles. Mix river sand, epoxy resin and formation water according to the ratio in Table 2, and stir evenly. Clean the inside of the mold, and fill each mold with the prepared mixture of river sand and epoxy resin; place the mold filled with sand under the hydraulic press, and after the mold position is adjusted, use the hydraulic press to press the mold at 7MPa for 4 minutes. Release the pressure after the pressure is stable; put the pressed mold into the oven, bake at 110°C for 1.5 hours, then raise the temperature to 180°C and bake for 1.5 hours, then turn off the oven, let it cool naturally to room temperature from Remove the core from the mold. The cementation degree of the rock is expressed by the cementation index, and the greater the cementation index, the higher the cementation degree. The porosity, permeability and cementation index of the core are shown...

Embodiment 3

[0029] The river sand with the same particle size distribution as the natural core is selected as the skeleton particles. Mix the river sand, epoxy resin and formation water according to the ratio in Table 3, and stir evenly. Clean the inside of the mold, and fill each mold with the prepared mixture of river sand and epoxy resin; place the sand-filled mold under the hydraulic press, and after the mold position is adjusted, use the hydraulic press to press the mold at 10MPa for 4 minutes. Release the pressure after the pressure is stable; put the pressed mold into the oven, bake at 105°C for 1.8 hours, then raise the temperature to 185°C and bake for 1.2 hours, then turn off the oven, let it cool down to room temperature naturally Remove the core from the mold. The cementation degree of the rock is expressed by the cementation index, and the greater the cementation index, the higher the cementation degree. The porosity, permeability and cementation index of the core are shown...

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Abstract

The invention discloses a method for making artificial rock core, relating to the field of petroleum exploration. The method for making the artificial rock core comprises the following steps: selecting skeleton particles with grain size distribution same as that of the natural rock core; mixing 58-65 parts of skeleton particles and 0-7 parts of stratum water and uniformly mixing after 2-6 parts of a cementing agent is added; and cleaning the inner part of a mold, putting the mixture in the mold and pressing under a hydraulic press, drying and setting shape in an oven, naturally cooling to the normal temperature and taking out the mold to obtain the artificial rock core. According to the method, rock coreswith different porosities, penetration ratesand cementation degrees can be produced through the stratum water under the condition of no change of the consumption amount of the cementing agent and pressing pressure; and the rock cores produced according to the method are close to the natural rock cores in the aspects of physical properties, pore structure, contact way, cementation degree and the like, and can be used for rock core flow experiments.

Description

technical field [0001] The invention relates to the field of petroleum exploration, in particular to a method for making a weakly cemented high-permeability loose sandstone artificial core. Background technique [0002] In the process of petroleum exploration, development and production, core flow experiments are required to solve many problems. Unconsolidated sandstone has the characteristics of poor cementation, loose structure, and low strength. Not only is the cost of coring high, but it is also difficult to obtain representative shaped cores. Due to the limitation of the source of natural cores, most domestic research institutions use artificial cores except for a small amount of natural cores when conducting core flow experiments. [0003] At present, there are three commonly used methods for making artificial cores: quartz filling, aluminum phosphate-quartz cementation, and epoxy resin cementation. From the perspective of the similarity of the core, the ease of prod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/28
Inventor 熊钰王帅李航徐宏光朱英斌
Owner SOUTHWEST PETROLEUM UNIV
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