Device and method for testing interfacial tension and contact angle by adopting spinning drop method under ultrahigh pressure and at high temperature

Abstract

The invention discloses a device and a method for testing the interfacial tension and the contact angle by adopting a spinning drop method under ultrahigh pressure and at high temperature. A precise optical rotating platform with a worm and gear structure is adopted to control a rotating cavity and a microscope camera system to be horizontal, so as to control liquid drop movement; an electrical control system is arranged in an electrical control box to control a high-speed motor, a microscope camera system and a temperature system; a sample tube in an ultrahigh-pressure and high-temperature rotating cavity adopts a two-end opening technology and a spring collet technology is adopted to realize the plugging of the sample tube, and thus, the sample tube can be cleaned conveniently; and an interfacial tension and contact angle calculating method adopts a contour fitting Young-Laplace equation method. The device and the method can be used for analyzing the ultralow interfacial tension and the contact angle value under the ultrahigh pressure and at the high temperature, and have the high promotion value in the fields such as oil fields, petrifaction, and research of new materials, and particularly in the tertiary oil recovery of the oil fields.

Description

technical field [0001] This patent discloses a set of testing devices and methods for testing interfacial tension and contact angle by using the spinning drop method under ultra-high pressure (70MPa or higher) and high temperature (200°C or higher) conditions. This patent adopts a high-pressure, high-speed rotary joint that realizes dynamic sealing under ultra-high pressure and high speed conditions as the main structure of the rotating sample tube and its sealing structure, and makes a main rotating cavity to form a rotating drop; The rotating cavity is installed on the main frame of the instrument to facilitate quick replacement and maintenance; the main frame has a microscopic camera system with a 5 (XYZθR) adjustable function; a precision optical rotating platform with a worm gear structure controls the rotating cavity And the level of the microscopic camera system to control the movement of the droplets; a control electrical system is installed in the electrical control b...

AI Technical Summary

Problems solved by technology

These deficiencies include: (1) There is no rotating drop method interfacial tensiometer that can work under ultra-high pressure and high temperature conditions; (2) In terms of the structure of the motor drive system, the belt drive mechanism is still the main one, and some are connected by magnets , but there are defects in the realization of synchronization and high speed; (3) the temperature control mode is usually based on controlling the heating source rather than controlling the temperature of the environment where the sample is located; (4) the sample tube is usually used as a driving shaft without any protection, thus causing the sample tube to burst easily; and the sample tube is usually only open at one end, which is not easy to clean, and the measurement error is large; the sample tube has a single size (such as the US patent), which cannot meet the complex test requirements; (5) usually there is no or only The simplest droplet level control structure cannot achieve high-precision control of droplet level, thereby achieving the purpose of reducing droplet movement; (6) There is no integrated test device to coordinate and complete the interfacial tension measurement under the rotating drop condition (7 ) The interfacial tension algorithm is relatively simple, and the measurement error is relatively large; etc.

However, in the patent, they did not further propose a detailed solution method, but only stayed on a possible guess for the numerical solution of the Young-Laplce equation, and could not actually and the overall interfacial tension test process; in the process of solving the contact angle, still Continue to use the original assumption that the shape of the droplet is a spherical cap or ellipsoid, and use the geometric method to solve it; and the focus of its patent innovation is to further supplement the previous patents, introducing the gravity coefficient to participate in the calculation of interfacial tension and contact angle

Therefore, some of the content involved in these patents is not similar to the test method of this patent application

Images