Process for treating oil field produced water

A treatment process and technology for produced water, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, mechanical oscillation water/sewage treatment, etc., can solve the problem of incomplete oil removal, heavy filtration system load, SRB The content exceeds the standard, etc., to achieve the effect of superior corrosion resistance, reduced processing costs, and strong corrosion resistance

Active Publication Date: 2012-10-10
XIAN CHANGQING TECH ENG
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Most domestic oilfield produced water treatment processes are "two-stage oil removal + two-stage filtration" or "one-stage oil removal + two-stage filtration" process. After years of operation, the following problems still commonly exist: (1) The first oil removal is not complete; (2) The filtration system has a heavy load, frequent backwashing, and low treatment accuracy; (3) For low-permeability oil fields and ultra-low-permeability oil fields, there are serious corrosion problems in pipelines and equipment; (4) The oxygen content exceeds the standard; (5) SRB Excessive content

Method used

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  • Process for treating oil field produced water
  • Process for treating oil field produced water

Examples

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Effect test

Embodiment 1

[0031] Such as figure 1 As shown, an oilfield produced water treatment process involves a regulating water tank, an air flotation device, a pipeline mixer, a nitrogen power reactor, a sedimentation tank and an ultrasonic filter. The oilfield produced water treatment process has the following steps:

[0032] In step 1, add coagulant and oilfield produced water to the regulating water tank for preliminary adjustment and mixing. The coagulant is commonly used in produced water treatment and can be selected according to needs, and no special requirements are made here.

[0033] In step 2, the adjusted oilfield produced water and flotation agent, flocculation, and coagulant in step 1 are introduced into the air flotation device. The air flotation process is used as a primary deoiling process, and the flotation agent, flocculation, and coagulant are used as extraction Commonly used in effluent treatment can be selected according to needs. There is no special requirement here. The oil fiel...

Embodiment 2

[0043] Such as figure 1 As shown, the process of this embodiment is the same as that of embodiment 1, except that a new type of nitrogen power reactor is used.

[0044] Such as figure 2 As shown, the nitrogen-powered reactor at least includes a reactor cavity 9, a nitrogen pipeline 8 and a partition 5; the structure of the reactor cavity 9 is a rectangular parallelepiped, and the interior of the reactor cavity 9 is fixedly connected with a partition 5 in the middle. 5 The reactor cavity 9 is divided into a front cavity 6 and a rear cavity 7 by using a "semi-closed type". The front cavity 6 has a produced water inlet 1 in the middle of the front face, and the rear cavity 7 has a produced water outlet in the middle of the back face. Water port 2; the front cavity 6 has a nitrogen gas inlet 3 on the left side of the front side, and a nitrogen gas outlet 4 on the right side of the upper end of the front cavity 6; the nitrogen gas inlet 3 and the nitrogen gas outlet 4 are connected b...

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Abstract

The invention belongs to a process for treating oil field produced water and belongs to the field of oil field produced water treatment, in particular relates to the process for treating the oil field produced water. In the process, at least a regulating water tank, an air flotation device, a pipeline mixer, a nitrogen power reactor, a sedimentation tank and an ultrasonic filter are adopted and the oil field produced water is treated by adopting a mode of combining air flotation oil and suspended matter removal, nitrogen preparation and ultrasonic filtration. The process for treating the oil field produced water has good treatment effect, high oil removing efficiency, corrosion resistance and low cost and has good effect in the actual application.

Description

Technical field [0001] The invention relates to the field of oil field produced water treatment, in particular to an oil field produced water treatment process. Background technique [0002] The Ordos Basin is a low-permeability and ultra-low-permeability oil field. The physical properties of the oil layer are poor, and the produced water is characterized by high salinity, high salt content, high chloride ion, and high iron content. It is a highly corrosive, high-scaling water body in the produced water of the oil field, and the water quality is complex. In order to maintain reservoir energy and oil recovery rate, water injection development is still the main technical measure. The quality of injection water plays an important role in the development of oilfields. The extremely low permeability has caused the produced water treatment system to have more stringent requirements for the quality of the produced water. [0003] Most of the domestic oil field produced water treatment p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/08C02F1/36
Inventor 王国柱郭增民郭志强熊超张帆
Owner XIAN CHANGQING TECH ENG
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