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A fracture-cavity carbonate rock artificial core and its 3D printing method

A technology of artificial core and carbonate rock, which is used in earth-moving drilling, tool manufacturing, additive processing, etc., can solve the problem that the randomness and complexity of the fracture-cavity system cannot be reflected, and the strength of artificial core is difficult to meet high-pressure experiments or acidizing pressure. Crack experiments and other problems, to achieve the effect of comparison and quantitative evaluation

Inactive Publication Date: 2019-04-23
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the method of making artificial cores of fractured-vuggy carbonate rocks is mainly to add artificially drawn or prepared caves, cracks, and pores to carbonate rocks or calcium carbonate powder, and then add certain cements to press them. The size and mutual configuration of caves, fractures, and pores in the reservoir are manually determined, which cannot reflect the randomness and complexity of the fracture-cave system in the actual reservoir, and the strength of the obtained artificial core is also difficult to meet the requirements of high-pressure experiments or acid fracturing experiments.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] An embodiment of the present invention provides a fractured-cavity carbonate rock artificial core, which is made of the following raw materials: fractured-cavity casting body, carbonate powder and binder; the fracture-cavity casting body is a field-selected fracture The cave-type carbonate rock is a model obtained by injecting epoxy resin into the fracture-cavity system by melting and casting, so the fracture-cavity casting body has at least two materials, which can be distinguished during 3D scanning. In one embodiment, the carbonate powder calcium carbonate powder and magnesium carbonate powder, the mass ratio of calcium carbonate and magnesium carbonate is 5-6:1, the particle size of carbonate powder is 200~400 mesh; ionized water.

[0020] A 3D printing method for a fracture-cavity carbonate rock artificial core, comprising the following steps:

[0021] (1) Select the fractured-cavity casting body and perform 3D scanning on the fractured-cavity casting body to obta...

Embodiment 2

[0026] The difference between embodiment 2 and embodiment 1 is that the fracture-cavity casting body with well-developed karst caves and fractures and no pores is selected. The shape of the artificial core is a cube, and the size of the artificial core is 0.5m×0.5m×0.5m. It is basically the same as Example 1.

Embodiment 3

[0028] The difference between embodiment 3 and embodiment 1 is that the fracture-cavity casting body with developed pores and cracks and undeveloped karst caves is selected, the shape of the artificial rock core is a cylinder, the diameter of the artificial rock core is 0.1m, and the height is 1m. Example 1 is basically the same.

[0029] The fracture-vuggy carbonate rock artificial core of the present invention relies on the real fracture-cavity system casting body, has the development characteristics and configuration modes of pores, caves, and fractures that conform to the actual reservoir, and is beneficial to the study of physical property differences and fluids of real reservoirs. Flow law; the fracture-cavity carbonate rock core obtained by the present invention has a certain strength and can meet the requirements of subsequent tests; the present invention can realize the unlimited replication of the same fracture-cave system carbonate rock, and can be used for acid frac...

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Abstract

The invention discloses a fracture-cavity type carbonate rock artificial core. The fracture-cavity type carbonate rock artificial core is manufactured through the following raw materials including a fracture-cavity cast body, carbonate powder and a bonding agent. The fracture-cavity cast body is a model which is obtained by injecting epoxy resin into a fracture-cavity system in a fusion casting manner for a fracture-cavity type carbonate rock selected on the spot. The invention further comprises a 3D printing method of the fracture-cavity type carbonate rock artificial core. The fracture-cavity type carbonate rock artificial core depends on the true fracture-cavity system cast body and has the practical pore, karst cave and crack development features and configuration modes conforming to the reservoir, and physical property differences and fluid flowing rules of the true reservoir are better studied.

Description

technical field [0001] The invention relates to the field of mining technology, in particular to a fracture-cavity carbonate rock artificial core and a 3D printing method thereof. Background technique [0002] Fracture-vuggy carbonate reservoirs are a new type of carbonate reservoirs with large karst caves, karst cave channels and fracture zones as storage and flow spaces. This kind of fracture-vuggy reservoir is widely distributed in the world, and the developed fractures, dissolution pores and caves are good oil and gas accumulation areas and flow channels of oil and gas. The existing experimental methods have limitations such as being greatly affected by the size of the sample and poor representativeness of the sample, which cannot meet the needs of the laboratory for research on the physical properties and reservoir stimulation of fractured-cavity carbonate reservoirs. Due to the high cost of manual coring operations, the extremely limited amount of coring, and the stro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B49/00G01N1/28B28B1/00B33Y50/00
CPCB28B1/001B33Y50/00G01N1/28
Inventor 王婋鲁新便潘琳刁友鹏邓磊高悦凯
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)