Manufacturing method of artificial rock core for simulating borehole drilling

A technology of artificial cores and production methods, applied in the preparation, sampling, and instrumentation of samples for testing, to achieve the effects of simple production methods, economical and easy-to-obtain raw materials, and avoid difficult acquisitions

Pending Publication Date: 2020-04-24
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the complexity and irregularity of formation petrophysical properties for indoor experimental simulation field research of high-energy physical perforation oil recovery technology, the simulation research requires cores with simulated boreholes and perforations, usually The artificial cores used cannot meet this demand
The existing solution is to preset a steel pipe with a certain diameter during the core pressing process, but this method limits the influence of the fluid on the perforation channel, which is largely different from the actual mine situation, so it is impossible to truly explore the process Dynamic response law of rock after action

Method used

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  • Manufacturing method of artificial rock core for simulating borehole drilling
  • Manufacturing method of artificial rock core for simulating borehole drilling
  • Manufacturing method of artificial rock core for simulating borehole drilling

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Experimental program
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Embodiment 1

[0077] Present embodiment 1 provides a kind of artificial core making method of simulating borehole drilling, comprises the following steps:

[0078] 1) Use a dryer to heat the Fischer-Tropsch wax to 110°C and melt it into a liquid state, put the melted Fischer-Tropsch wax in the wellbore drilling mold, cool naturally for 24 hours to form, remove the wellbore drilling mold, and obtain the wellbore drilling mold Hole paraffin embryo body; the borehole paraffin embryo body includes a cylindrical body and three staggered cylindrical arms extending integrally from the side wall of the cylindrical body; wherein, the diameter of the cylindrical body is 8mm, The diameter of described cylindrical support arm is 3mm, and the length of described cylindrical support arm is 17mm;

[0079] 2) Mix and stir 500g of 40-mesh quartz sand, 500g of composite Portland cement and 12.5g of clay to obtain mixture A; mix and stir mixture A and water to obtain a mixed slurry; wherein, the mass ratio of...

Embodiment 2

[0087] Present embodiment 2 provides a kind of artificial core making method of simulating borehole drilling, comprises the steps:

[0088] 1) Use a dryer to heat the Fischer-Tropsch wax to 110°C and melt it into a liquid state, put the melted Fischer-Tropsch wax in the wellbore drilling mold, cool naturally for 24 hours to form, remove the wellbore drilling mold, and obtain the wellbore drilling mold Hole paraffin body; the borehole paraffin body includes a cylindrical body and three staggered cylindrical arms extending integrally from the side wall of the cylindrical body; wherein, the diameter of the cylindrical body is 10 mm, The diameter of described cylindrical support arm is 3mm, and the length of described cylindrical support arm is 20mm;

[0089] 2) Mix 400g of 60 mesh quartz sand, 800g of composite portland cement and 10g of clay to obtain mixture A; mix and stir mixture A and water to obtain a mixed slurry; wherein, the mass ratio of quartz sand, cement, clay and wa...

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Abstract

The invention discloses a manufacturing method of an artificial rock core for simulating borehole drilling. The manufacturing method comprises the steps of: 1) manufacturing a borehole drilling paraffin blank; 2) manufacturing an artificial rock core blank containing mixed slurry and the borehole drilling paraffin blank prepared in the step 1), wherein the mixed slurry comprises quartz sand, cement, clay and water; and 3) heating the artificial rock core blank prepared in the step 2) to obtain the artificial rock core for simulating borehole drilling. The manufactured artificial rock core is similar to a natural rock core in the aspects of permeability, porosity and other physical properties, and simulates perforating measures in the oil production process; the artificial rock core manufactured by adopting the manufacturing method can be used for researching a damage transformation rule of oil production measures such as perforation fracturing on a stratum, and conducting related indoor simulation experiments; in addition, the whole manufacturing method is simple and safe, raw materials are economical and easy to obtain, and the problem that experimental analysis is limited due tothe fact that natural rock cores are difficult to obtain, unstable in rock physical property, large in complexity and anisotropy difference and the like is solved.

Description

technical field [0001] The invention relates to the technical field of making artificial rock cores. More specifically, it relates to a method for making an artificial core for simulating borehole drilling. Background technique [0002] At present, the exploitation of domestic oil resources is seriously insufficient, and the oil and gas fields discovered later are mostly low-permeability and ultra-low-permeability reservoirs, and the formation rocks are relatively hard. Therefore, high-energy physical perforation oil recovery technology has been widely used. However, the application of this technology is limited due to the difficulty and high cost of obtaining natural cores. [0003] In the experiment of simulating the impact of different loading rates on rocks in the laboratory, the artificial cores usually used are mainly made of quartz sand or river sand mixed with cement in a certain mass ratio, and a certain amount of water is added to stir and solidify. The artificia...

Claims

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Application Information

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IPC IPC(8): G01N1/28G01N1/36G01N1/38G01N1/44
CPCG01N1/286G01N1/36G01N1/38G01N1/44G01N2001/366
Inventor 刘义刚孟祥海刘长龙张丽平高尚兰夕堂符扬洋张璐
Owner CHINA NAT OFFSHORE OIL CORP
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