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Process and system suitable for treating produced water with ultra-high salinity

A high salinity, produced water technology, applied in mining wastewater treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problem of low oil recovery rate and excessive oily sludge by-product , poor quality and other problems, to achieve the effect of simple process and equipment operation, low oily sludge output, and high oil recovery rate

Pending Publication Date: 2022-07-19
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The invention is developed aiming at the problems existing in the existing ultra-high salinity produced water purification treatment process
Solve the complex process and equipment, the mismatch between the functional design and effect of the process unit, the low treatment efficiency of the process unit, the type and dosage of chemicals are too large, the oil recovery rate is low and the quality is poor, and the amount of by-product oily sludge is too large And other issues

Method used

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  • Process and system suitable for treating produced water with ultra-high salinity

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Embodiment Construction

[0033] The object of this implementation treatment is the ultra-high salinity produced water of the No. 1 Union Station of Tahe Oilfield, which is the dehydration of the produced fluid from the carbonate reservoir after sedimentation. The salinity is 210,000mg / L, the density is 1.15kg / L, and the oil content is 1000mg / L; the proportion of floating oil is about 60%, the finely dispersed oil is about 20%, and the emulsified oil is about 20%. The density of the oil contained is 0.92kg / L ;Suspended solid about 500mg / L;Ca 2+ +Mg 2+ Content 13,000mg / L, total hardness 33,000mg / L; pH value 6.1.

[0034] Polyquaternium reversed demulsification and Q802 organic flocculant are all from Tianjin Zhengda Technology Co., Ltd. TS7652;

[0035] like figure 1 As shown in the figure, a process for the treatment of ultra-high salinity produced water in this embodiment includes the following process: the ultra-high salinity produced water first passes through the buffer tank to equalize, and is ...

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Abstract

The invention discloses a process and a system suitable for treating produced water with ultra-high salinity, the produced water with ultra-high salinity firstly enters a cyclone flotation separator, floating oil and finely dispersed oil are separated and recovered to a dirty oil settling tank, and large-particle sludge is discharged to an oil sludge concentration tank; outlet water of the separator and an alkaline clear water type demulsifier are mixed and input into a demulsification reaction tank for demulsification and destabilization, after being lifted by a pump and mixed with a cationic organic flocculant, the mixture is sequentially input into a settling separation tank, floating oil is recycled to a dirty oil receiving tank, and suspended solids form floc precipitates and are discharged into an oil sludge concentration tank; the effluent of the settling separation tank is lifted by a pump to enter a multi-medium filter, the effluent is treated until the oil content, the suspended solid content and the particle size median index of the produced water meet the reinjection standard and then is output, and backwash filter residues are sent to a sludge concentration tank; dewatered sump oil is sent to a crude oil treatment process, and concentrated sludge is sent to be dewatered and dried. The process has the advantages of high oil recovery rate, low oily sludge yield, simple process and equipment operation, low operation cost and the like.

Description

technical field [0001] The invention belongs to the technical field of oil field produced water treatment, and relates to a purification process and a system for separating petroleum and suspended solids in ultra-high salinity produced water. Background technique [0002] The salinity of ultra-high salinity produced water is usually above 200,000 mg / L, which is composed of oil, solid impurities, dissolved gases (such as H 2 S, CO 2 ) and soluble salts and other multi-component heterogeneous complex systems. It has the characteristics of high emulsification degree, high oil content, high salt content, high hardness, high suspended solid content, low pH value, etc.; 2+ and / or sulfide (S 2- ), also showed the characteristics of unstable water quality and strong corrosiveness. Purification and deep separation of oil and suspended solids are the prerequisites for reinjection of ultra-high salinity produced water. [0003] In the actual project of ultra-high salinity produced...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F11/12C02F103/10
CPCC02F9/00C02F11/12C02F1/24C02F1/001C02F1/52C02F1/40C02F1/38C02F1/66C02F2103/10
Inventor 赵毅郭靖翟科军赵德银秦飞钟荣强彭明旺黎志敏刘冀宁张菁常小虎庞艳萍
Owner CHINA PETROLEUM & CHEM CORP
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