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A Quantitative Evaluation Method of Hydrophilicity of Rock and Its Application

A quantitative evaluation and hydrophilic technology, applied in the direction of measuring devices, surface/boundary effects, instruments, etc., can solve problems such as unevenness, reduced contact angle accuracy and repeatability, and unreliable lateral comparison, to achieve accurate measurement, The effect of strong repeatability of measurement results

Active Publication Date: 2018-07-13
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It was mentioned in the book "Coal Flotation and Fine Coal Utilization" in 2001 that the heterogeneity of the sample surface, the inhomogeneity of the surface roughness, and the differences in grinding materials and methods will reduce the accuracy and accuracy of the measured contact angle. Repeatability, so the method is not reliable for accurate measurement of contact angle, or for lateral comparison of measurement results
Obviously, after the sample is press-molded, the physical and chemical properties of the surface to be tested have changed, and the measured contact angle value cannot truly reflect the hydrophilicity of the original sample.
In addition, the compression surface after press molding is not only not smooth and uniform, but also porous. According to the Cassie-Baxter formula, porosity will have a serious impact on the measured contact angle value, so this method is also unreliable. of

Method used

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  • A Quantitative Evaluation Method of Hydrophilicity of Rock and Its Application
  • A Quantitative Evaluation Method of Hydrophilicity of Rock and Its Application
  • A Quantitative Evaluation Method of Hydrophilicity of Rock and Its Application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Quantitative evaluation of hydrophilicity of shale. Two pieces of mudstone from an oilfield in Xinjiang (hereinafter referred to as Xinjiang mudstone 1 and Xinjiang mudstone 2) and one piece of shale from an oilfield in Sichuan (hereinafter referred to as Sichuan shale) were used in the experiment for quantitative measurement and evaluation. The specific experimental steps are as follows:

[0050] 1) Crush the three solid block samples to be tested, pass through a 200-mesh standard sieve, bake in an oven at 105°C for 8 hours, and store in a desiccator sealed for later use.

[0051] 2) Measure the true densities d of the three powdered samples after drying using the Lee density bottle method.

[0052] 3) According to the internal size of the mold molded by the press, the true density of the sample and the expected thickness of the sample after molding (between 5mm and 10mm), calculate the required mass m' of the dried sample.

[0053] 4) Weigh a powdery sample with a ma...

Embodiment 2

[0061] Quantitative evaluation of hydrophilicity of coal rocks. Experimental procedure is identical with embodiment 1, and difference is that, experiment has used the coal rock 2 pieces (hereinafter respectively referred to as Xinjiang coal rock 1 and Xinjiang coal rock 2) of certain oil field in Xinjiang, 1 piece of coal rock (hereinafter referred to as Xinjiang coal rock 2) of certain oil field in Shanxi (hereinafter referred to as Shanxi coal rock) instead of mudstone and shale in Example 1, using formula (3) instead of formula (2) to calculate the final true contact angle θ.

[0062] The results are shown in Table 1 and Table 2.

Embodiment 3

[0064] The influence of pressurization pressure or pressurization time on the quantitative evaluation results of shale hydrophilicity was investigated. Experimental procedure is identical with embodiment 1, and difference is, only used a kind of mudstone (being Xinjiang mudstone 2) in embodiment 1 to carry out experiment, and used pressurization pressure or pressurization time when changing experiment (specifically please ask See Table 1).

[0065] The results are shown in Table 1.

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Abstract

The invention relates to a method for evaluating the hydrophilicity of rocks, comprising the following steps: a) pulverizing solid massive or powdery rock samples to be tested, passing them all through a standard sieve larger than 100 mesh, and drying them in an oven, Obtain the dried sample; b) measure the true density d of the dried sample obtained in step a); c) use a press to press the dried sample obtained in step a) into a molded block sample, and accurately measure and / or calculate its Volume and mass, calculate its apparent density d' according to its volume and mass; d) use a contact angle meter to measure the apparent contact angle θ' of the fluid on the surface of the formed block sample; e) use the formula to calculate the porosity of the formed block sample εv; f) Use the formula to calculate the true contact angle θ to evaluate the hydrophilicity of the rock. The invention also relates to the use of the method.

Description

technical field [0001] The invention relates to a rock evaluation method, in particular to a rock qualitative evaluation method. The invention also relates to the use of this method. Background technique [0002] The hydrophilicity of rock refers to the phenomenon that when the surface of solid rock contacts with another immiscible fluid, the fluid adsorbs on its surface in the shape of a spherical cap. The hydrophilicity of a rock depends on its mineral composition and fluid properties. It is generally believed that most sedimentary rocks are hydrophilic because sedimentary rocks are deposited in an aqueous medium, and water is a polar molecule. But for source rocks, since they contain many oil-wet organic matter particles and can generate hydrocarbons under certain conditions, they can be considered to be partially hydrophilic and partially oil-wet. [0003] During oil drilling, the formations encountered are mostly hydrophilic. When the hydrophilic rock is in contact ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N13/00
Inventor 李雄徐江褚奇刘贵传张国孔勇李大奇
Owner CHINA PETROLEUM & CHEM CORP