An oil-water separation device and process for oilfield acidizing fracturing fluid

Abstract

The invention discloses an oil-water separation device and process for oilfield acidification fracturing fluid, belonging to the field of sewage and sewage oil treatment equipment. It is characterized in that it includes an acidizing fracturing flowback fluid delivery pipeline, a heat exchanger (2), a gel breaking device, an emulsification mixing device, a cyclone separation device, and an oil storage tank (9 ) and sewage tank (10); the acidizing fracturing flowback fluid delivery pipeline is connected to the lower part of the gel breaking device through the heat exchanger (2), the upper part of the gel breaking device is connected to the demulsification mixing device, and the demulsification mixing device is connected to the cyclone The separation device, the overflow port and the underflow port of the cyclone separation device are respectively connected to the oil storage tank (9) and the sewage tank (10) through pipelines. The invention has the advantages of good degreasing effect, stable process, compact structure, low operating cost, etc., and is especially suitable for sites far away from gathering and transportation treatment stations, and realizes on-site treatment and on-site recovery of flowback liquid.

Description

technical field [0001] The invention discloses an oil-water separation device and process for oilfield acidification fracturing fluid, belonging to the field of sewage and sewage oil treatment equipment. Background technique [0002] Acid fracturing is the use of acid hydraulic action to form cracks in the oil layer, which is called oil layer hydraulic fracturing. The fluid used for fracturing is called fracturing fluid. At present, 95% of fracturing fluids are water-based fracturing fluids, and oil-based fracturing fluids only account for 5%. Various additives are added to the fracturing fluid to increase the viscosity of the fracturing fluid at high temperature, reduce its viscosity at low temperature, and control the fluid loss into the formation. During oilfield operations, a large amount of flowback waste liquid will be produced. The flowback waste liquid contains a large amount of organic additives. At the same time, the additives have more and more components and the...

AI Technical Summary

Problems solved by technology

During oilfield operations, a large amount of flowback waste liquid will be produced. The flowback waste liquid contains a large amount of organic additives. At the same time, the additives have more and more components and their stability is getting better and better. Therefore, acidification and fracturing wastewater often It presents the characteristics of high acidity, high stability, high CODcr and high salinity, which makes it more and more difficult to treat this kind of flowback liquid. 1. The construction sites of fracturing operations are extremely scattered, and the wastewater discharge method is intermittent, and the discharge volume varies greatly. This type of wastewater is not suitable for conventional biochemical treatment.

[0003] At present, there are few studies on the treatment of oil-water separation in acidified fracturing flowback fluid. The basic method is to add demulsifiers, flocculants and purifiers before sedimentation treatment, which will make crude oil become aging oil and cannot be refined

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