Device and method for demulsifying water-in-oil type emulsion

Abstract

The invention discloses a device and method for demulsifying water-in-oil type emulsion. The device comprises an injection pump A, an injection pump B, an intermediate container A, an intermediate container B, an intermediate water container, an intermediate oil container, a high-pressure demulsifying reaction kettle, a rock core clamping device and a collection container, wherein the intermediatewater container and the intermediate oil container are arranged in parallel, and two ends of the intermediate water container and the intermediate oil container communicate with the injection pump Band the rock core clamping device respectively; two connectors are arranged at the top of the high-pressure demulsifying reaction kettle; one connector communicates with the rock core clamping deviceand the other connector communicates with the intermediate container A and the intermediate container B; a collection opening is formed in a side face of the high-pressure demulsifying reaction kettle; the collection opening communicates with the collection container; and the intermediate container A communicates with the injection pump A. According to the device disclosed by the invention, the volumes of an oil phase and a water phase in a physical simulation experiment process can be collected at the same time and the volumes of the produced oil phase and water phase can be accurately metered in real time, so that the accuracy of calculating the oil displacement efficiency and the moisture content of produced liquid is ensured, and the precision of experiments is further improved.

Description

technical field [0001] The invention relates to a device and method for demulsifying water-in-oil emulsions, belonging to the technical field of tertiary petroleum development. Background technique [0002] As an unconventional petroleum resource, heavy oil is extremely rich in reserves and is one of the most important energy sources in the 21st century. In the development process of heavy oil, because heavy oil contains a large amount of colloidal asphaltenes. Colloidal asphaltenes are natural surface active substances. Crude oil is easily emulsified with front condensate water during steam flooding to form a water-in-oil (W / O) emulsion with strong stability. This part of the water-in-oil type The emulsion is very stable and not easy to stratify. During the displacement process, the displacement pressure will increase and the displacement difficulty will increase. [0003] At present, physical simulation experiments are usually used at home and abroad to evaluate the effe...

AI Technical Summary

Problems solved by technology

However, there are some deficiencies in this type of method at present: 1) adding different amounts of demulsifiers will lead to inaccurate volumes of the oil phase and the water phase, and the measurement error is large; 2) the viscosity of the water-in-oil emulsion formed by the thicker oil Large and difficult to flow, so the demulsifier is not easy to contact the emulsion at the lower end of the collector, so the demulsification efficiency is low; 3) Most demulsifiers are toxic or easily toxic chemicals, and long-term use will bring risks to the health of the experimenter. And when dealing with waste liquid, professional treatment methods are also required, thus increasing health and economic costs

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