Testing method for rock surface static contact angle and rock surface wettability dynamic change testing method utilizing testing method for rock surface static contact angle

A technology of static contact angle and test method, which is applied in the field of dynamic change test of rock surface wettability and test field of rock surface static contact angle, can solve the problems that the dynamic change of contact angle is difficult to accurately grasp, and the value is inaccurate, etc., to achieve The effect of long continuous test time and high sensitivity

Active Publication Date: 2017-04-26
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods are inaccurate for small contact angle values, are not sensitive to small changes in contact angle, and are difficult to accurately grasp the dynamic change of contact angle with contact time.

Method used

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  • Testing method for rock surface static contact angle and rock surface wettability dynamic change testing method utilizing testing method for rock surface static contact angle
  • Testing method for rock surface static contact angle and rock surface wettability dynamic change testing method utilizing testing method for rock surface static contact angle
  • Testing method for rock surface static contact angle and rock surface wettability dynamic change testing method utilizing testing method for rock surface static contact angle

Examples

Experimental program
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Effect test

Embodiment 1

[0069] In this example the wettability of doubly distilled water on glass slides (cover glass, quartz slide) of two different sizes was determined. Before the test, put double distilled water into the cleaned sample cell to keep the temperature for 1 hour; clamp the cleaned and dried glass piece and hang it on the micro balance for immediate test; -1 The rate rises slowly until the liquid level just touches the lower surface of the glass sheet. During the rising process, the liquid level is always parallel to the lower surface of the suspended glass sheet, and the test table remains without vibration; when the liquid level just touches the lower surface of the glass sheet, due to the secondary Distilled water wets the surface of the glass sheet, forming a meniscus on the surface of the glass sheet, and records the force (F) exerted by the glass sheet on the double-distilled water through the reading of the microbalance; through formula calculation, the double-distilled water on...

Embodiment 2

[0083] According to the method of Example 1, the change law of the static contact angle on the quartz surface with the prolongation of the contact time was tested.

[0084] The reading that the microbalance records is multiplied by the acceleration of gravity (g=9.8N / kg) to obtain the force size F of the quartz plate, and the contact angle θ of the aqueous solution on the surface of the quartz plate is obtained by the method in example 1 under different contact time conditions, and the quartz plate The relationship curve between the force F of the sheet and the contact angle of the aqueous solution on the quartz sheet and the contact time is as follows: image 3 shown.

[0085] image 3 It shows the micro-changes of the force F and contact angle θ of the quartz sheet with the prolongation of the contact time, indicating that this test method has high sensitivity and can record micro-changes of the contact angle, which is helpful for understanding the dynamic change law of roc...

Embodiment 3

[0087] Test the contact angle of different pH value solutions on the quartz surface by the method of example 2. Get the relationship between the contact angle θ and the pH value of different pH value aqueous solutions on the quartz plate by the method introduced in Example 2, as Figure 4 shown.

[0088] Such as Figure 4 Shown: When pH=2.3, the force on the quartz plate is the minimum, and the contact angle is the maximum. When the pH>2.3, as the pH value of the solution increases, more electrically neutral silanol groups on the quartz surface dissociate to form negatively charged silanol groups, so the force on the quartz surface increases and the hydrophilicity increases; When the pH+ When the concentration is very high, some of the electrically neutral silanol groups on the quartz surface are transformed into positively charged silanol groups with stronger hydrophilicity, which shows that the force on the quartz surface is increased and the hydrophilicity is enhanced. T...

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Abstract

The invention particularly relates to a testing method for a rock surface static contact angle and a rock surface wettability dynamic change testing method utilizing the testing method for the rock surface static contact angle. The testing method for the rock surface static contact angle includes the steps that the surface of a rock slice is cleaned and dried for use; by means of a surface/tension meter, a sample cell capable of ascending and descending is filled with to-be-tested liquid, and the rock slice for use is clamped and suspended below a micro balance; testing is carried out by means of an 'Interfacial tension' mode, the sample cell slowly ascends during testing till the liquid level just makes contact with the lower surface of the rock slice, reading numbers displayed by the micro balance are recorded, and the stress magnitude (F) of the rock slice is calculated; the contact angle (theta) of the to-be-tested liquid on the surface of rock is deduced and obtained according to the stress magnitude (F) of the rock slice, wherein theta is shown as the formula shown in the specification. The testing method is high in sensitivity, the micro balance can capture the micro change of surface stress of the rock slice, and the small contact angle and the micro change of the contact angle can be tested; the continuous testing time is long, and the rock surface wettability dynamic change rule can be recorded.

Description

technical field [0001] The invention belongs to an analysis and measurement technology in the fields of interface chemistry and instrument analysis, and in particular relates to a method for testing the static contact angle of a rock surface and a method for testing the dynamic change of wettability of the rock surface using the method. Background technique [0002] Wettability is an important characteristic of reservoir rocks. It is a major factor affecting the distribution and flow of oil and water in rock pores, and directly restricts the relative permeability, capillary force and oil recovery of oil and water. , by effectively adjusting the wettability of the rock surface, the injection pressure of low-permeability reservoirs can be reduced, the water absorption profile of water injection wells in sandstone and clastic rock reservoirs can be improved, and the remaining oil can be effectively tapped, thereby effectively improving the production of sandstone and clastic roc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N13/00G01N13/02
CPCG01N13/00G01N13/02G01N2013/0208
Inventor 华朝张健
Owner CHINA NAT OFFSHORE OIL CORP
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