Oil extraction wastewater treatment method used for oilfield reinjection

A technology of oil production sewage and treatment method, which is applied in the treatment of waste water or sewage, water field, can solve the problems of high total cost, strong corrosion, impact on ecology, etc., and achieve the effect of low treatment cost, high treatment efficiency and easy operation

Inactive Publication Date: 2010-07-28
XI'AN PETROLEUM UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

② Strong corrosiveness
However, this method is slow to take effect and may affect the ecology, so it is not safe. Moreover, if it needs to be put in for a long time, the total cost may be high

Method used

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  • Oil extraction wastewater treatment method used for oilfield reinjection
  • Oil extraction wastewater treatment method used for oilfield reinjection
  • Oil extraction wastewater treatment method used for oilfield reinjection

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Taking the treatment of 1000mL oil extraction wastewater as an example, the raw materials and treatment methods used are as follows:

[0027] 1. Desulfurization and iron removal

[0028] Take 1000mL of oil production sewage at 30-60°C, add 240mg of a 30% composite aqueous solution prepared by hydrogen peroxide and sodium hypochlorite at a mass ratio of 1:4, and stir for 5 minutes.

[0029] 2. Adjust the pH value

[0030] Add a compound composed of CaO and NaOH at a mass ratio of 1:2 to the water after desulfurization and iron removal in step 1, and adjust the pH value to 7.5.

[0031] 3. Coagulation to remove oil and suspended particles

[0032] Add 60 mg of polyaluminum chloride to the water after pH adjustment in step 2, and stir for 5 minutes.

[0033] Al in the above-mentioned polyaluminum chloride 2 o 3 The content is higher than 27%, the basicity is 45%-95%, and the mass percentage of water-insoluble matter in 1% aqueous solution is lower than 2%. It is produ...

Embodiment 2

[0037] Taking the treatment of 1000mL oil extraction wastewater as an example, the raw materials and treatment methods used are as follows:

[0038] In the desulfurization and iron removal step 1 of the present embodiment, 200 mg of a 30% composite aqueous solution prepared by adding hydrogen peroxide and sodium hypochlorite in a mass ratio of 1:4 is used. Other steps of this step are the same as in Example 1. In step 3 of coagulation and degreasing and suspended particles, 40 mg of polyaluminum chloride was added to the water after the pH value was adjusted in step 2, and other steps of this step were the same as in Example 1. In the flocculation and sedimentation step 4, adding the copolymer 1.5 mg of dimethyl diallyl ammonium chloride and acrylamide with a viscosity-average molecular weight of 10 million to the water after coagulation and degreasing and suspended particles in step 3, the step Other steps are identical with embodiment 1. Other steps are identical with embod...

Embodiment 3

[0040] Taking the treatment of 1000mL oil extraction wastewater as an example, the raw materials and treatment methods used are as follows:

[0041]In the desulfurization and iron removal step 1 of the present embodiment, 300 mg of a composite aqueous solution with a mass fraction of 30% prepared by adding hydrogen peroxide and sodium hypochlorite in a mass ratio of 1:4, other steps of this step are the same as in Example 1. In step 3 of coagulation and degreasing and suspended particles, 80 mg of polyaluminium chloride was added to the water after the pH value was adjusted in step 2, and other steps of this step were the same as in Example 1. In the flocculation and sedimentation step 4, adding the copolymer 2mg of dimethyl diallyl ammonium chloride and acrylamide with a viscosity-average molecular weight of 10 million to the water after coagulation and degreasing and suspended particles in the step 3, other steps of the step Step is identical with embodiment 1. Other steps ...

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Abstract

The invention discloses an oil extraction wastewater treatment method used for oilfield reinjection, comprising the following steps of: desulphurization and deferrization, adjustment of pH value, cohesion degreasing and suspension particles removing, and flocculating setting. The oil extraction wastewater treatment method provided by the invention overcomes the shortcomings that inorganic flocculants, organic flocculants, fungicides, HAG (antiincrustation corrosion inhibitor) and other drug agents are needed to be added and the treatment cost is high during oil extraction wastewater treatment in the past, has the advantages of simple treatment method, simple operation, low treatment cost, and high treatment efficiency, and solves the problem of stable water quality during wastewater reinjection treatment course.

Description

technical field [0001] The invention belongs to the technical field of water, waste water or sewage treatment, and in particular relates to a treatment method for oil recovery sewage used for oilfield reinjection. Background technique [0002] Oil extraction wastewater is a multiphase system that integrates suspended solids, oil, and dissolved substances, which are extracted from the formation together with crude oil and separated from oil and water. The impurities in it are: ① Suspended solids: the particle diameter range is 1×10 -3 ~10μm, mainly heavy oils such as mud sand, corrosion products, scale, bacterial residues, colloidal asphalt and paraffin, with a content of more than 50mg / L; ②Oil: including dispersed oil, slick oil and emulsified oil, with a content of 50-1000mg / L, 90% of which is dispersed oil of 10-100μm and slick oil larger than 100μm, 10% is emulsified oil, and its particle size is 1×10 -3 More than μm; ③Dissolved substances: mainly dissolved inorganic io...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F1/58C02F1/52C02F1/40C02F103/10
Inventor 屈撑囤王新强宋绍富吴新民杨志刚马云张宁生李彦
Owner XI'AN PETROLEUM UNIVERSITY
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