Oil and gas interface tension measurement device and method

Abstract

The invention discloses an oil-gas interface tension determination apparatus and an oil-gas interface tension determination method. The oil-gas interface tension determination apparatus comprises an oil-gas interface tension determination unit, a crude oil supply unit and a CO2 supply unit, wherein the crude oil supply unit (2) and the CO2 supply unit (3) are respectively connected to the oil-gasinterface tension determination unit (1), and the crude oil supply unit comprises a gas cylinder end pressure gauge, a probe end pressure gauge, a differential pressure flow sample injection pump anda high-pressure liquid-state CO2 gas cylinder. According to the present invention, the oil droplet injection volume can be precisely controlled through the differential pressure sample injection of the crude oil supply unit, such that the stable liquid droplet can be formed at the probe position so as to quantitatively and stably inject the sample; and by using the pre-filled oil-gas balance method, the experimental conditions are close to the formation conditions, such that the interfacial tension test results close to the formation conditions can be obtained.

Description

technical field [0001] The present disclosure relates to interfacial tension measurement technology, and more specifically, to a device and method for measuring oil-gas interfacial tension. Background technique [0002] There are many methods for measuring interfacial tension, mainly including capillary method, detachment method, hanging sheet method, bubble maximum pressure method, pendant drop method and spinning drop method. Among them, the hanging plate method, rotating drop method and pendant drop method are the most widely used. The principle of hanging plate method is to use the balance of interfacial tension and tension, and use the method of direct force measurement, which is suitable for two phases with little difference in density. The measurement of interfacial tension between fluids; the spinning drop method is to put the two-phase fluid into a horizontal tube and rotate at high speed, and use the balance of centrifugal force and interfacial tension to measure i...

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Problems solved by technology

The inventors found that this method has the problem of rapid pressure breakthrough. When the pressure at the injection end is too low, the flow control box cannot be effectively driven, causing the pressure to be suppressed at the injection end. Once the pressure breaks through, a large number of oil droplets will flow into the

This method cannot effectively control the amount of injected oil droplets

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