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A general-purpose non-sticky man-made sandstone core

An artificial sandstone, non-adhesive technology, applied in the field of artificial sandstone cores, can solve problems such as research constraints

Inactive Publication Date: 2017-03-29
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Since the existing artificial sandstone cores cannot provide an environment similar to real cores in the study of seepage mechanism, acidification, fracturing, perforation simulation, etc., the research on the above aspects is subject to certain restrictions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1: The artificial sandstone core is made of the following raw materials added by weight percentage: 82% of the particle size is 35 to 40 mesh river sand, 5% calcium carbonate, 3% magnesium carbonate and 10% clay, at a temperature of 50°C and a pressure of 40MPa Press down for 24 hours, then inject simulated formation water with a total salinity of 0.5g / L into the rock core at a rate of 0.05ml / min through a metering pump to form a circulation, and press at a temperature of 120°C and a pressure of 80MPa for 48 hours and make artificial sandstone cores with a porosity of 20-28% and a permeability of 500-10000mD.

Embodiment 2

[0022] Embodiment two: artificial sandstone rock core is added by the following raw material by weight percentage: 86% particle size is 200~250 purpose river sand, 4% calcium carbonate, 2% magnesium carbonate and 8% clay, at temperature 140 ℃, pressure 50MPa It is formed by pressing for 96 hours under certain conditions (the simulated formation water is injected into the artificial core at a rate of 0.04ml / min through a metering pump after 24 hours of compaction and circulates, and the total salinity of the simulated formation water is 8g / L); The manufactured artificial sandstone core has a porosity of 20-25% and a permeability of 100-1000mD.

Embodiment 3

[0023] Embodiment 3: The artificial sandstone core is made of the following raw materials added by weight percentage: 88% of the particle size is 350-400 mesh river sand, 5% calcium carbonate, 2% magnesium carbonate and 5% clay, at a temperature of 150°C and a pressure of 120MPa It is made by pressing down for 120 hours (after 24 hours of compaction, the simulated formation water is injected into the artificial core at a rate of 0.03ml / min through a metering pump and circulated, and the total salinity of the simulated formation water is 20g / L); The artificial sandstone core has a porosity of 20-25% and a permeability of 60-500mD.

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PUM

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Abstract

The invention provides a general type non-adhesive artificial sandstone core which is prepared from the following raw materials by weight percent: 70-90% of framework grains, 3-10% of calcium carbonate, 2-5% of magnesium carbonate, 0-3% of ferrous oxide, 0-3% of aluminum chloride and 5-15% of clay mineral; the general type non-adhesive artificial sandstone core is formed by pressing for 36-120 hours in the simulated formation water environment under the conditions that the temperature is 40-150 DEG C and the pressure is 20-150MPa; the artificial sandstone core does not contain an artificial adhesive; a core pore structure comprises primary pores and secondary pores; the structure of the artificial sandstone core is nearly consistent with that of a real core; the general type non-adhesive artificial sandstone core has the cylinder compressive strength of 0.1-150MPa, is high temperature resistant and high pressure resistant, and has the porosity of 13-28% and the permeability of 10-10000mD, thus meeting the demands of researchers for cores with different physical properties; the general type non-adhesive artificial sandstone core can be applied to experimental study such as rock seepage rule, wettability, rock rupture strength, core acidification, water shut-off and profile control, etc.

Description

technical field [0001] The invention relates to an artificial rock core, in particular to an artificial sandstone core without unnatural cement. Background technique [0002] Sandstone cores are the basis for studying the seepage law of clastic rock reservoirs. However, during the development of oil and gas reservoirs, due to the high cost of manual coring operations, the amount of cores taken is extremely limited. At the same time, the core size of the target layer is small, which cannot meet Laboratory research on reservoir seepage law. Therefore, when studying the seepage law of oil and gas reservoirs in the laboratory, artificial sandstone cores are usually used as oil and gas seepage sites. Since the cementation of natural cores usually takes millions of years, in order to prepare artificial cores for experiments in a short period of time, at present, in various artificial sandstone core preparation methods, artificial glue substances such as epoxy resin or phosphate a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/28
Inventor 潘琳李龙龙王林明袁晓蔷毛园高能
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)