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Treatment method for oil field polymer-bearing wastewater

A treatment method and technology for sewage, which can be used in water/sewage multi-stage treatment, water/sludge/sewage treatment, mining wastewater treatment, etc. It can solve problems such as pollution and membrane flux attenuation, improve treatment efficiency, reduce cleaning number of times, the effect of extending the operating cycle

Active Publication Date: 2014-10-01
JIANGSU JIUWU HITECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the application of inorganic membrane ultrafiltration technology in the treatment of oilfield reinjection water has been widely studied at home and abroad. Successful application cases are mainly related to factors such as membrane flux attenuation and membrane fouling

Method used

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  • Treatment method for oil field polymer-bearing wastewater

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Such as figure 1 Shown, the oil field poly-containing sewage treatment method of the present invention may further comprise the steps:

[0025] Input the poly-containing sewage into the pretreatment device, using O 3 / H 2 o 2 Cooperative oxidation treatment. Concrete reaction condition is: pH value is under raw water alkaline condition, O 3 and H 2 o 2 The concentrations are 118mg / L and 15mg / L respectively, the oxidation time is 30min, and the reaction temperature is 30°C.

[0026] The oxidized sewage enters the inorganic membrane equipment for cross-flow filtration. The average pore size of the inorganic membrane is 20nm, the membrane surface flow velocity is 3m / s, the transmembrane pressure difference is 0.4MPa, the sewage temperature is 35°C, and the permeate is directly used In reinjection, the circulating fluid that has not penetrated the membrane is mixed with incoming water and then enters the inorganic membrane equipment for filtration again. The sewage i...

Embodiment 2

[0029] The method for treating oil field poly-containing sewage of the present invention comprises the following steps:

[0030] Step 1, input the sewage containing polymer into the pretreatment device, adopt O 3 / H 2 o 2 oxidation treatment. Concrete reaction condition is identical with embodiment 1. pH value under alkaline condition of raw water, O 3 and H 2 o 2 The concentrations are 118mg / L and 15mg / L respectively, the oxidation time is 30min, and the reaction temperature is 30°C.

[0031] Step 2, the oxidized sewage enters the inorganic membrane equipment for cross-flow filtration. The average pore size of the inorganic membrane is 20nm, the membrane surface flow velocity is 5m / s, the transmembrane pressure difference is 0.4MPa, and the sewage temperature is 10, 30, 50 , 70, 90, 95 ℃, the permeate is directly used for reinjection, the circulating fluid that has not permeated the membrane is mixed with the incoming water, and then enters the inorganic membrane equip...

Embodiment 3

[0035] Such as figure 1 Shown, the oil field poly-containing sewage treatment method of the present invention may further comprise the steps:

[0036] Step 1, input the poly-containing sewage into the pretreatment device, and use Fenton reagent for oxidation treatment. The specific reaction conditions are: Fe in Fenton's reagent 2+ and H 2 o 2 The concentrations are 100mg / L and 15mg / L respectively, the pH value of the system is 4, the reaction temperature is 40°C, and the reaction time is 60min.

[0037] Step 2. The oxidized sewage enters the inorganic membrane equipment for cross-flow filtration. The average pore size of the inorganic membrane is 200nm, the membrane surface flow velocity is 3m / s, the transmembrane pressure difference is 0.4MPa, and the sewage temperature is 50°C. The liquid is directly used for reinjection. The circulating liquid that has not penetrated the membrane is mixed with the incoming water and then enters the inorganic membrane equipment for filt...

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Abstract

The invention provides a treatment method for oil field polymer-bearing wastewater. The treatment method comprises the following steps of inputting polymer-bearing wastewater into a pre-treatment device to carry out oxidization treatment; entering inorganic membrane equipment (an inorganic membrane including a ceramic membrane, a silicon carbide membrane and a metal membrane) through a material supply pump and a circulating pump in sequence; carrying out cross flow filtration on oxidized wastewater in the inorganic membrane equipment, directly applying permeated liquor for re-injection, mixing circulating liquor which does not pass through the membrane with water and then carrying out filtration again after entering the inorganic membrane equipment, circulating and filtering the sewage for many times under action of a circulating pump, and discharging concentrated liquor into a concentrated liquor tank after cross flow filtration is carried out many times in a circulating manner and concentration of wastewater in the circulating tank is 30-1000 times that of the water. The treatment method for oil field polymer-bearing wastewater provided by the invention can remove oil and suspended matters in the polymer-bearing wastewater by one step, so that water quality of outlet water reaches A1-level low-permeability oil layer reinjection water standards.

Description

technical field [0001] The invention belongs to the field of water treatment, and in particular relates to a treatment method for oilfield sewage containing poly. Background technique [0002] As the oilfield enters the late stage of high water cut development, the remaining recoverable reserves are getting less and less, and the decline in oil production is becoming more and more serious. The new method of tertiary oil recovery is an important measure to increase the recoverable reserves. Polymer flooding is a tertiary oil recovery technology widely used in domestic oilfields. Its main principle is to increase the viscosity of the aqueous solution by adding polymers during the water injection process of oil extraction, and at the same time reduce the permeability of the aqueous solution and improve the oil-water relationship. The viscosity ratio between them can expand the volumetric sweep coefficient, so as to enhance oil recovery. However, with the expansion of the appli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F103/10
Inventor 张春刘飞刘友强徐增磊彭文博张宏
Owner JIANGSU JIUWU HITECH
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