Recovery processing process for fracturing return liquid

A fracturing flowback fluid recovery treatment technology, applied in water/sewage treatment, flotation water/sewage treatment, reduced water/sewage treatment, etc., can solve problems such as cost consumption, immature technology, and large dosage , to achieve the effect of low treatment cost, good treatment effect and less dosage

Active Publication Date: 2009-07-08
DAQING OILFIELD CO LTD +1
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AI Technical Summary

Problems solved by technology

At present, advanced treatment includes electrochemical treatment method and biological treatment method. The difficulty of using advanced treatment to reach the standard discharge is to reduce COD. Among them, the electrochemical treatment method requires a large amount of dosing, requires high cost of micro-electrolysis, and most of the cost is consumed in reducing COD. , requires the use of strong acid, strong alkali and other regulators, which is not conducive to safe production, and its treatment effect is also unstable; biological treatment requires a suitable ambient temperature, and the degradation time is long. It is still in the experimental stage and has not been applied in the field, and the technology is not mature.

Method used

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Embodiment Construction

[0011] The present invention will be further described below in conjunction with embodiment:

[0012] The oil well fracturing flowback fluid in each operation area of ​​the oilfield is transported by tanker to the fracturing flowback fluid treatment station. The flowback liquid is unloaded in the oil collection tank, and the dirty oil continuously settles and separates to float on the liquid surface. After being recovered by the oil skimmer, the tank truck is transported to the dehydration station for treatment. After the dirty oil on the surface of the fracturing flowback fluid is taken away, the remaining sewage flows into No. 1, No. 2 and No. 3 pools in order to degrade naturally for 15 days, and 20 days in autumn. No. 1 pool, No. 2 pool and No. 3 pool The No. 3 pool is connected by pipelines in the lower part of the pool. The No. 2 pool has less dirty oil than the No. 1 pool, and the No. 3 pool has less dirty oil than the No. 2 pool. Add gel breaker active polyaluminum ch...

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Abstract

The invention relates to a process for reclaiming and treating fracturing backflow fluid. The process comprises the following steps: a, feeding the fracturing backflow fluid into a dirty oil reclaiming pool, and reclaiming dirty oil; b, after natural degradation, adding gel breaker active polyaluminium chloride into sewage, and pumping the sewage into an electric flocculator; c, further breaking gel and emulsion in the sewage through the electric flocculator; and d, after electric flocculation treatment, feeding water purifying agent nano-scale clay and flocculating agent polyaluminium chloride into the sewage, adding coagulant aid polyacrylamide after the sewage is pumped by the pump, feeding the sewage into a suspended silt filter and then conveying the sewage into an oilfield sewage treatment station to be treated and recycled. The process for treating the fracturing backflow fluid has the advantages of low cost, safe production and stable treating effect, and is not limited by environmental conditions.

Description

Technical field: [0001] The invention relates to a process for recovering and treating fracturing flowback fluid in the field of oil recovery. Background technique: [0002] Usually, the fracturing flowback fluid is simply separated and recovered for oil components, and the wastewater is discharged on site or stored in a centralized manner. At present, advanced treatment includes electrochemical treatment method and biological treatment method. The difficulty of using advanced treatment to reach the standard discharge is to reduce COD. Among them, the electrochemical treatment method requires a large amount of dosing, requires high cost of micro-electrolysis, and most of the cost is consumed in reducing COD. , requires the use of strong acid, strong alkali and other regulators, which is not conducive to safe production, and its treatment effect is also unstable; biological treatment requires a suitable ambient temperature, and the degradation time is long. It is still in the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F1/463C02F1/465C02F1/52C02F1/70C02F1/72
Inventor 谢朝阳周山林倪双明
Owner DAQING OILFIELD CO LTD
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