Preparation method of artificial rock core of jointing shale

An artificial core and rational technology, applied in the field of preparation of jointed shale artificial core, can solve the problem that the length and size of artificial core cannot meet the experimental requirements, and achieve the effect of simple operation, efficient development, and simple materials

Active Publication Date: 2014-09-10
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is to solve the problem that the length and size of the existing artificial cores are difficult to meet the experimental requirements. It is composed of quartz sand and cement, and is not suitable for simulating shale cores with multiple layers, multiple fractures, and high brittleness.
Another Chinese invention patent with application number 201310022534.X discloses a method for preparing an artificial rock core simulated by an acoustic experiment. The skeleton simulation material of the artificial rock core is carbonate rock cuttings or powder. Compared with ignoring the influence of viscosity minerals, brittle mineral components and fractures on the physical properties of shale, it is not suitable for simulating shale cores with multi-layered, multi-fractured and high brittleness.

Method used

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  • Preparation method of artificial rock core of jointing shale
  • Preparation method of artificial rock core of jointing shale
  • Preparation method of artificial rock core of jointing shale

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A method for preparing a jointed shale artificial core, comprising the steps of:

[0034] (1) Mix cement, quartz sand, clay and gypsum powder;

[0035] (2) Add a small amount of oatmeal, shredded paper to the mixture in step (1), add water and stir evenly;

[0036] (3) The mixture in step (2) is cast into cement samples in layers, and a layer of lubricating oil is applied between the layers. After the cement samples are dried and formed, the jointed shale artificial core can be obtained.

[0037] In this embodiment, the volume ratio of the cement, quartz sand, clay, and gypsum powder is 4.5:4.5:1:1.

[0038] In this embodiment, the mass percentage of the oatmeal in the artificial core is 0.1%.

[0039] In this embodiment, the mass percentage of the shredded paper pieces in the artificial core is 0.05%.

[0040] In this embodiment, the water accounts for 19% by mass of the artificial core.

[0041] In this embodiment, the cement is composite Portland cement. The com...

Embodiment 2

[0053] A method for preparing a jointed shale artificial core, comprising the steps of:

[0054] (1) Mix cement, quartz sand, clay and gypsum powder;

[0055] (2) Add a small amount of oatmeal, shredded paper to the mixture in step (1), add water and stir evenly;

[0056](3) The mixture in step (2) is cast into cement samples in layers, and a layer of lubricating oil is applied between the layers. After the cement samples are dried and formed, the jointed shale artificial core can be obtained.

[0057] In this embodiment, the volume ratio of the cement, quartz sand, clay, and gypsum powder is 4: 5:0.8:0.8.

[0058] In this embodiment, the mass percentage of the oatmeal in the artificial core is 0.12%.

[0059] In this embodiment, the mass percentage of the shredded paper pieces in the artificial core is 0.1%.

[0060] In this embodiment, the water accounts for 18% by mass of the artificial core.

[0061] In this embodiment, the cement is composite Portland cement. The com...

Embodiment 3

[0072] A method for preparing a jointed shale artificial core, comprising the steps of:

[0073] (1) Mix cement, quartz sand, clay and gypsum powder;

[0074] (2) Add a small amount of oatmeal, shredded paper to the mixture in step (1), add water and stir evenly;

[0075] (3) The mixture in step (2) is cast into cement samples in layers, and a layer of lubricating oil is applied between the layers. After the cement samples are dried and formed, the jointed shale artificial core can be obtained.

[0076] In this embodiment, the volume ratio of the cement, quartz sand, clay, and gypsum powder is 5: 4: 1.2: 1.2.

[0077] In this embodiment, the mass percentage of the oatmeal in the artificial core is 0.2%.

[0078] In this embodiment, the mass percentage of the shredded paper pieces in the artificial core is 0.06%.

[0079] In this embodiment, the water accounts for 20% by mass of the artificial core.

[0080] In this embodiment, the cement is composite Portland cement. The ...

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Abstract

The invention belongs to the technical field of artificial rock core preparation, and in particular relates to a preparation method of an artificial rock core of jointing shale. The method comprises the following steps: mixing and stirring cement, quartz sand, clay and gypsum powder; adding a small amount of cereal and scraps of paper into the mixture, adding water into the mixture and stirring uniformly; casting the mixture in a layered manner to form a cement test sample; and coating lubricating oil between every two layers, and drying the cement test sample for molding, thereby obtaining the artificial rock core of the jointing shale. By the preparation method, the cement test sample with certain fracture development, bedding development and brittleness can be obtained, and the mechanical properties of a bedding plane (1), a natural fracture (2), a hydraulic fracture (3) and the like of the jointing shale rock can be simulated relatively accurately, so that shale oil and gas can be developed effectively. According to the preparation method, the used materials are simple, the cost is low, and the operation is simple and convenient.

Description

technical field [0001] The invention belongs to the technical field of artificial rock core preparation, and in particular relates to a preparation method of jointed shale artificial rock core. Background technique [0002] During the deposition process of shale gas reservoirs, weak planes such as bedding, schistification, and micro-fractures develop, and the above weak planes affect the expansion direction of hydraulic fractures. According to the fracture development characteristics, mineral composition and rock mechanical properties of the Longmaxi shale in the Sichuan Basin, artificial cores were prepared in the laboratory for true triaxial hydraulic fracturing physical simulation experiments, which is to understand shale reservoirs and simulate shale mechanical characteristics. An important means to efficiently develop shale oil and gas. At present, the rock cores prepared in the laboratory are often mixed and cast with cement and quartz sand in proportion. The rock cor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/28C04B28/04
Inventor 侯冰陈勉金衍程万卢运虎
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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