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Rock core pretreatment method

A pretreatment and core technology, applied in the field of core pretreatment, can solve the problem of low foam stability and achieve good treatment results

Inactive Publication Date: 2014-06-04
唐静
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the concentration of the surfactant solution exceeds the cmc more, the surface adsorption rate is faster, so it is often found that the foam stability is lower

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0031] The invention discloses a pretreatment method of rock core, comprising the following steps:

[0032] (a) preparing rock cores to be processed for use;

[0033] (b) Bake the core at high temperature;

[0034] (c) degassing with a vacuum pump;

[0035] (d) Then it is saturated with degassed standard brine or kerosene, and the whole process is over.

[0036] The high temperature is 700-800°C.

[0037] The high temperature is 750°C.

[0038] The baking time is 1h.

[0039] The degassing time is 2h.

[0040] The saturation time is above 24h.

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PUM

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Abstract

The invention discloses a rock core damage experiment method. The method comprises the following steps: 1, preparing a rock core to be treated for later use; 2, baking the rock core at a high temperature; 3, degassing by using a vacuum pump; and 4, saturating by using degassed standard brine or kerosene until the whole treatment whole ends. The method enables the rock core to be pretreated, realizes a good treatment effect, and provides a foundation for the rock core damage experiment.

Description

technical field [0001] The invention relates to a pretreatment method of rock core. Background technique [0002] Foam is a heterogeneous dispersion system formed by dispersing insoluble (or slightly soluble) gas in liquid or molten solid, in which the liquid is the continuous phase (dispersion medium) and the gas is the discontinuous phase (dispersion phase). The foam has a large surface free energy. After the foam is broken, the total surface area of ​​the system liquid is greatly reduced, that is, the energy is reduced. Therefore, it is a thermodynamically unstable system, but under certain conditions, taking appropriate measures, Can maintain a certain stability. To characterize the state of phases in such mixed systems, the two most commonly used methods are the Kazakov method and the Mitchell method. Kazakov used the value of foam ratio Kf. When Kf﹤3.8, this mixed system is considered to be a gas emulsion in liquid, and when Kf>3.8, it is a stable foam. Mitchell ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/44
Inventor 唐静
Owner 唐静