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Double-micro-treatment process for treating oilfield produced water

A produced water and micro-treatment technology, applied in the field of water treatment, can solve the problem of unsatisfactory suspended solids content, median particle size of suspended solids and impurity content, aggravating the maintenance and operation burden of water injection station and post-treatment, water injection station and post-treatment Deal with problems such as fouling of equipment and pipes to achieve the effect of avoiding abnormal increase in filter resistance, good water treatment effect, and stable parameters

Inactive Publication Date: 2020-12-01
ANJIEYU BEIJING OILFIELD TECHNICAL SERVICES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The applicant found that the method disclosed in Chinese patent CN107445321A adopts the "micro-swirl air flotation + micro-filtration" process to treat oilfield produced water. And the optimization of K80 coefficient, in the case of long-term operation of the treatment system, the filtration resistance of the filtration system increases, and the water treatment efficiency of the treatment system decreases; The median diameter and impurity content are still not ideal, which will easily cause scaling and corrosion in the equipment and pipelines of the water injection station and post-treatment, and increase the maintenance and operation burden of the water injection station and post-treatment

Method used

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  • Double-micro-treatment process for treating oilfield produced water
  • Double-micro-treatment process for treating oilfield produced water
  • Double-micro-treatment process for treating oilfield produced water

Examples

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Effect test

Embodiment 1

[0049] A double micro-treatment process for treating oilfield produced water, comprising: a pre-treatment step, a micro-swirl air flotation step, a water balance step, and a micro-filtration step.

[0050] The pretreatment step includes a settling step and a filtering step.

[0051] In the settling step, silicon dioxide particles are put into the produced water of the oil field, stirred and settled for 3 hours at a temperature of 50°C.

[0052] The stirring speed is 20 RPM.

[0053] The ratio of oilfield produced water: silicon dioxide particles in parts by weight is 1000:1.

[0054] The silica particles are silica particles immobilized with Pseudomonas aeruginosa and Bacillus subtilis, and the preparation method thereof comprises: treating the silica particles and immobilizing bacteria.

[0055] For the treatment of the silica granules, heat the 20-mesh silica granules to 110°C in a vacuum environment and keep them warm for 10 minutes; place the silica granules in 0.5% sodi...

Embodiment 2

[0080] A double micro-treatment process for treating oilfield produced water, comprising: a pre-treatment step, a micro-swirl air flotation step, a water balance step, and a micro-filtration step.

[0081] The pretreatment step includes a settling step and a filtering step.

[0082] In the settling step, silicon dioxide particles are put into the produced water of the oilfield, stirred and settled for 5 hours at a temperature of 60°C.

[0083] The stirring speed is 30 RPM.

[0084] The ratio of oilfield produced water: silicon dioxide particles in parts by weight is 1000:1.

[0085] The silica particles are silica particles immobilized with Pseudomonas aeruginosa and Bacillus subtilis, and the preparation method thereof comprises: treating the silica particles and immobilizing bacteria.

[0086] For the treatment of the silica particles, heat the 20-mesh silica particles to 130°C in a vacuum environment and keep the heat for 12 minutes; place the silica particles in 1% sodiu...

Embodiment 3

[0111] A double micro-treatment process for treating oilfield produced water, comprising: a pre-treatment step, a micro-swirl air flotation step, a water balance step, and a micro-filtration step.

[0112] The pretreatment step includes a settling step and a filtering step.

[0113] In the settling step, silicon dioxide particles are put into the produced water of the oil field, stirred and settled for 4 hours at a temperature of 55°C.

[0114] The stirring speed is 30 RPM.

[0115] The ratio of oilfield produced water: silicon dioxide particles in parts by weight is 1000:1.

[0116] The silica particles are silica particles immobilized with Pseudomonas aeruginosa and Bacillus subtilis, and the preparation method thereof comprises: treating the silica particles and immobilizing bacteria.

[0117] For the treatment of the silica particles, heat the 25-mesh silica particles to 120°C in a vacuum environment and keep the temperature for 12 minutes; place the silica particles in ...

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Abstract

The invention provides a double-micro-treatment process for treating oilfield produced water. The double-micro-treatment process comprises a pretreatment step, a micro-cyclone air flotation step, a water body balancing step and a micro-filtration step. The double-micro-treatment process for treating the oilfield produced water has the beneficial effects that after the oilfield produced water is treated by the double-micro-treatment process, the oil content in the water is 0.9-1.2 mg / L, the suspended solid content is 0.39-0.50, and the median particle size is 0.03-0.06; in the long-time operation process of the water treatment system, each parameter index of each reaction module is stable without out-of-control phenomenon, and the water treatment effect is good; compared with the prior art,the treatment capacity is improved by 10-12%, the treatment capacity is high, and the treatment time is short.

Description

technical field [0001] The invention relates to the field of water treatment, in particular to a double micro-treatment process for treating oilfield produced water. Background technique [0002] With the continuous development of oilfields, the oilfield industry is constantly changing, and oil recovery technology has experienced primary, secondary, and tertiary oil recovery technology innovations. At present, my country's oilfield production has reached a relatively high level of development and is in the follow-up development stage, mainly for secondary and tertiary oil recovery. . Secondary oil recovery mainly uses artificial water injection to maintain formation pressure; tertiary oil recovery mainly relies on changing the characteristics of the injected water to recover oil, such as adding alkali, surfactants, polymers and other chemical substances to the injected water. With the large-scale development of secondary and tertiary oil recovery, the volume of water produce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F103/10
CPCC02F9/00C02F1/001C02F2001/007C02F1/24C02F1/40C02F2103/10C02F1/5236
Inventor 严希海严谨
Owner ANJIEYU BEIJING OILFIELD TECHNICAL SERVICES CO LTD
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