A device and method for demulsification of water-in-oil emulsion

Abstract

The invention discloses a device and method for demulsification of water-in-oil emulsion, which 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 demulsification reaction kettle, A core holder and a collection container; the intermediate water container and the intermediate oil container are arranged in parallel, and the two ends are respectively communicated with the injection pump B and the core holder; the top of the high-pressure demulsification reactor is provided with two interfaces, one The interface is connected with the core holder, and the other interface is connected with the intermediate container A and the intermediate container B. The side of the high-pressure demulsification reactor is provided with a collection port, and the collection port is connected with the collection container; the intermediate container A is connected with the injection Pump A is connected. The present invention can simultaneously collect the volumes of the oil phase and the water phase during the physical simulation experiment, and accurately measure the volumes of the produced oil and water phases in real time, thereby ensuring the accuracy of the calculation of the oil displacement efficiency and the water content of the produced fluid , further improving the accuracy of the experiment.

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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