A kind of compound synergistic system of water clearing agent and method for avoiding the generation of viscoelastic sludge

A compound synergistic and clearing agent technology, applied in the field of industrial water treatment, can solve the problems of high oil content in sewage, short treatment time and large amount of dosing.

Active Publication Date: 2018-06-26
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are many clear water / water purification agents used for oilfield sewage treatment, among which cationic water clear agents have fast settling speed and short treatment time, but they will destabilize polymers in produced water to form viscoelastic flocs
The non-ionic water purifying agent has good compatibility with the anionic polymer in the produced water, and does not generate sludge, but there are problems such as large dosage, high oil content in sewage, and poor treatment effect

Method used

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  • A kind of compound synergistic system of water clearing agent and method for avoiding the generation of viscoelastic sludge
  • A kind of compound synergistic system of water clearing agent and method for avoiding the generation of viscoelastic sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1, preparation clear water agent compound synergistic system

[0023] 1ml of hydroxamic acid modified polyacrylamide (purchased from SNF Company in France, trade name KM800, made into an aqueous solution with a mass fraction of 1%) and 2.2ml of acrylamide-dimethyldiallylammonium chloride copolymer (CAS number is 26590-05-6, molecular weight is 10 4-5 ) mixed to obtain a water agent compound synergistic system.

[0024] In the compound type clear water agent prepared in this example, the quality of the cationic type clear water agent (acrylamide-dimethyl diallyl ammonium chloride copolymer) and the anionic type clear water agent (hydroxamic acid modified polyacrylamide) The ratio is 2.2:1.

Embodiment 2

[0025] Embodiment 2, preparation clear water agent compound synergistic system

[0026] 1.2ml of hydroxamic acid-modified polyacrylamide (purchased from SNF Company in France, trade name KM800, prepared as an aqueous solution with a mass fraction of 1%) and 2ml of acrylamide-dimethyldiallylammonium chloride copolymer (CAS number is 26590-05-6, molecular weight is 10 4-5 ) and mixed to obtain a compound type clear water medicament.

[0027] In the compound type clear water agent prepared in this example, the quality of the cationic type clear water agent (acrylamide-dimethyl diallyl ammonium chloride copolymer) and the anionic type clear water agent (hydroxamic acid modified polyacrylamide) The ratio is 2:1.2.

Embodiment 3

[0028] Embodiment 3, preparation clear water agent compound synergistic system

[0029] 1.6ml of sodium butyl xanthate (purchased from Yantai Junbang) and 1.6ml of dimethylamine-epichlorohydrin-ethylenediamine copolymer (molecular weight 10 4 ) and mixed to obtain a compound type clear water medicament.

[0030] In the compound type clear water agent prepared by the present embodiment, the mass ratio of the cation type clear water agent (the copolymer of dimethylamine-epichlorohydrin-ethylenediamine) and the anionic type clear water agent (organic amine phosphate) is 1: 1.

[0031] The composite clear water medicament prepared in Example 1-3 was used to treat the sewage containing polymer, and the bottle test method was used to evaluate the performance of the composite clear water medicament of the present invention:

[0032] The specific steps are:

[0033] 1. The polymer-containing sewage water sample is provided by an oilfield in the Bohai Sea. The polymer-containing sew...

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Abstract

The invention discloses a composite synergist water clarifier system and a method for preventing generation of sticky and elastic oil sludge. The composite synergist water clarifier system for polymer-containing sewage treatment is composed of a cationic water clarifier and an anionic water clarifier; at least one of an acrylamide-dimethyl diallyl ammonium chloride copolymer, a dimethylamine-epichlorohydrin-ethylenediamine copolymer, polyaluminium chloride and poly-ferric sulfate is adopted as the cationic water clarifier; hydroxamic acid-modified polyacrylamide and / or sodium n-butyl xanthate are / is adopted as the anionic water clarifier; the mass ratio of the anionic water clarifier to the cationic water clarifier is 1:(0.5-5). According to the composite synergist water clarifier system, the anionic water clarifier and the cationic water clarifier are simultaneously used to firstly perform adsorption together with an reagent with the high sewage action activity at some points to change the original characteristics (such as the surface electrical property, the wetting capability, the chemical adsorption characteristic and the electric charge density) of the surfaces of oil droplets and particles and then enable other reagents to perform secondary stacking adsorption on the surfaces of the points or perform co-adsorption by penetrating through the points, and therefore the co-strengthening effects of water clarification, inverse demulsification and sticky and elastic oil sludge generation prevention are achieved.

Description

technical field [0001] The invention relates to a water agent compound synergistic system and a method for avoiding viscoelastic sludge formation, which is used for avoiding viscoelastic sludge formation during the treatment of polymer-containing sewage, and belongs to the technical field of industrial water treatment. Background technique [0002] Re-injection after treatment of oil recovery wastewater containing polymer is the correct way to rationally develop and utilize water resources and improve the utilization rate of water circulation. Moreover, the temperature of the produced water is high, and the water contains a lot of oil-displacing polymers, which has a strong oil washing function and can significantly improve the The overall technical and economic benefits of oilfield waterflooding development. The treatment and re-injection of polymer-containing oil production wastewater involves issues such as water purification and stability. There are many clean water / pur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/40C02F1/52C02F1/56
CPCC02F1/40C02F1/5236C02F1/54C02F1/56
Inventor 王秀军翟磊靖波张健檀国荣
Owner CHINA NAT OFFSHORE OIL CORP
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