Device for determining COD (Chemical Oxygen Demand) value of negative-pressure distilled fracturing flow-back fluid steam

Abstract

The invention discloses a device for determining COD (Chemical Oxygen Demand) value of negative-pressure distilled fracturing flow-back fluid steam. The device comprises a vacuum pump, a vacuum pressure gauge, a buffering bottle, a porous glass plate absorption bottle, a distillation bottle and a heater, wherein a certain amount of fracturing flow-back fluid to be treated is filled into the distillation bottle; a certain amount of distilled water is filled into the porous glass plate absorption bottle. The heater is used for heating the fracturing flow-back fluid in the distillation bottle; the fracturing flow-back fluid steam generated by distillation forms condensed liquid through suction of the vacuum pump and then the condensed liquid flows into the porous glass plate absorption bottle. The buffering bottle arranged between the porous glass plate absorption bottle and the vacuum pump is used for protecting the vacuum pump. By adopting the device disclosed by the invention, distillation is carried out on a negative-pressure environment, so that the distillation time is shortened and the COD value of in the high-pressure fracturing flow-back fluid steam can also be improved; the COD removal rate is improved under the same initial discarding ratio. The device is simple in structure and easy to operate, can be used for determining the COD value of the distilled fracturing flow-back fluid steam under different negative pressure and is suitable for being popularized and applied to fracturing flow-back fluid industries.

Description

technical field [0001] The invention relates to the field of fracturing flowback liquid treatment, in particular to a device for measuring the COD value of negative pressure distillation fracturing flowback liquid steam. Background technique [0002] Fracturing is an important means to solve the problems of low permeability and difficult exploitation of unconventional oil and gas reservoirs. During each fracturing process, a single oil and gas well needs to consume up to 15,000 m 3 The fracturing fluid is configured with water, and 10% to 70% of it becomes the fracturing flowback fluid through flowback. Since a large amount of additives such as gelling agent (mainly guar gum and its derivatives), cross-linking agent, and gel breaker are added in the process of fracturing fluid preparation, a large amount of additives are carried in the process of fracturing fluid flowback. Compounds, heavy metal ions, bacteria, and radioactive elements, so COD can usually reach 5,000 to 10...

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Problems solved by technology

[0003] When the distillation method is used to treat fracturing flowback fluid, the reason for the high COD value of the condensate is that it contains a large amount of organic compounds that are volatile after being heated. Therefore, the traditional distillation method is limited in removing COD from fracturing flowback fluid.

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