Treatment method of polymer flooding and binary combination flooding-SP-sewage

A technology of binary compound flooding and treatment method, applied in water/sewage treatment, water/sludge/sewage treatment, flocculation/sedimentation water/sewage treatment, etc. Problems such as large, increased consumption, etc.

Active Publication Date: 2012-11-14
KARAMAY SANDA NEW TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The biggest difference between polymer flooding and binary compound flooding (SP) sewage and oilfield water flooding sewage is that it contains polyacrylamide and surfactants as oil displacement agents. It is also because of the existence of oil displacement agents that polymer flooding and binary The properties of composite flooding (SP) sewage are very different from those of conventional water flooding sewage, which are manifested in: the suspended matter points in sewage are highly dispersed and stable, the emulsification is serious, and it has the characteristics of oil content, high suspended matter content, and small particle size; anionic polymer Severely interferes with the coagulation process of water purifiers, making the water purification effect of conventional water purifiers worse, and the dosage is greatly increased; when the polymer content is high, it often makes it difficult for the suspended solids content in the treated water to meet the injection water quality standard
[0003] Many scholars at home and abroad are committed to the research of polymer flooding and composite flooding sewage treatment technology, and have achieved many achievements and patents: CN201...

Method used

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  • Treatment method of polymer flooding and binary combination flooding-SP-sewage
  • Treatment method of polymer flooding and binary combination flooding-SP-sewage

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The polymer content of the test sewage was 257 mg / L, and the pretreatment agent 1 was industrial ferrous sulfate (FeSO 4 ·7H 2 O), add 30 mg / L, after an interval of 15s, add pretreatment agent 2 as industrial ammonium persulfate ((NH 4 ) 4 S 2 o 8 ), add an amount of 30 mg / L, stir well and then let it stand for 1 hour to react; add coagulant 1000 mg / L (based on the effective content of aluminum sulfate) under rapid stirring conditions (G value is 350s-1), and react for 1.5 After 1 min, add flocculant (partially hydrolyzed polyacrylamide) 8 mg / L, continue to react under stirring conditions for 1.5 min, stop stirring, let it settle for 10 min, take the middle clear liquid for water quality testing, the concentration of suspended solids in water is 5.00 mg / L, oil content 3.76 mg / L;

[0021] The coagulant of the test is prepared in parts by weight: add 200 parts of aluminum sulfate to 780 parts of tap water under stirring conditions, add 20 parts of polydimethyldially...

Embodiment 2

[0024] The polymer content of the test sewage is 471mg / L, and the pretreatment agent 1 is industrial ferrous sulfate (FeSO 4 ·7H 2 O), the dosage is 50 mg / L, and the pretreatment agent 2 is added after an interval of 15s, which is industrial ammonium persulfate ((NH 4 ) 4 S 2 o 8 ), add an amount of 50 mg / L, stir evenly and let it stand for 1 hour to react; add coagulant 1500 mg / L (based on the effective content of aluminum sulfate) under rapid stirring conditions (G value is 350s-1), and react for 1.5 After 1 min, add flocculant (partially hydrolyzed polyacrylamide) 8 mg / L, continue to react under stirring conditions for 1.5 min, stop stirring, let it settle for 10 min, take the middle clear liquid for water quality testing, the concentration of suspended solids in water is 4.50 mg / L, oil content 3.95 mg / L;

[0025] The coagulant used is prepared in parts by weight: add 200 parts of aluminum sulfate to 780 parts of tap water under stirring conditions, add 20 parts of po...

Embodiment 3

[0028] The polymer content of the test sewage was 790mg / L, and the pretreatment agent 1 was industrial ferrous sulfate (FeSO 4 ·7H 2 O), the dosage is 50 mg / L, and the pretreatment agent 2 is added after an interval of 15s, which is industrial ammonium persulfate ((NH 4 ) 4 S 2 o 8 ), adding an amount of 50 mg / L, stirring evenly and standing for 1 hour to react; under rapid stirring conditions (G value 350s-1), adding coagulant 1000 mg / L (based on the effective content of polyaluminium chloride), After reacting for 1.5 minutes, add flocculant (partially hydrolyzed polyacrylamide) 8 mg / L, continue to react under stirring conditions for 1.5 minutes, stop stirring, let it settle for 10 minutes, take the middle clear liquid for water quality testing, and the concentration of suspended solids in the water is 2.00 mg / L, oily 2.18 mg / L;

[0029] The coagulant of test is prepared in parts by weight: under agitation, 200 parts of polyaluminum chloride are added to 460 parts of tap...

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Abstract

The invention provides a treatment method of polymer flooding and binary combination flooding-SP-sewage, which comprises the following steps: sequentially adding 30-50 mg/L industrial ferrous sulfate and 30-50 mg/L industrial ammonium persulfate in a concentration ratio of 1:1 into sewage in a sewage tank at a time interval of 15-20 seconds, and after reacting for 1-2 hours, sending into a sewage buffer tank; adding 150-1500 mg/L coagulant in the sewage from the sewage buffer tank before pumping, evenly mixing by a lifting pump impeller, sending into a cyclone reactor to react for 1.5-2.0 minutes, adding 8-12 mg/L anionic-type partially hydrolyzed polyacrylamide flocculant, carrying out cyclone reaction for 1.5-2.0 minutes, and sending into a sedimentation tank; sedimentating for 10-30 minutes to obtain purified water on the middle lower part, wherein the suspended substance concentration and oil content are less than 10 mg/L; and filtering to obtain injection water for low-permeability reservoirs, wherein the coagulant is prepared from 100-300 parts of aluminum sulfate, aluminum chloride or polyaluminium chloride, 1-300 parts of industrial hydrochloric acid, 20-100 parts of polydimethyldiallylammonium chloride and 300-780 parts of tap water.

Description

technical field [0001] The invention relates to the treatment of sewage in oil and gas surface engineering, and is especially suitable for the purification treatment of sewage in polymer flooding and binary compound flooding (SP). Background technique [0002] The biggest difference between polymer flooding and binary compound flooding (SP) sewage and oilfield water flooding sewage is that it contains polyacrylamide and surfactants as oil displacement agents. It is also because of the existence of oil displacement agents that polymer flooding and binary The properties of composite flooding (SP) sewage are very different from those of conventional water flooding sewage, which are manifested in: the suspended matter points in sewage are highly dispersed and stable, the emulsification is serious, and it has the characteristics of oil content, high suspended matter content, and small particle size; anionic polymer Seriously interfere with the coagulation process of water purifie...

Claims

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Application Information

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IPC IPC(8): C02F1/00C02F1/52C02F1/56
Inventor 黄连华严忠黄保军贾剑平王益军任定益张茂胜刘玉萍曹雪梅倪丰平
Owner KARAMAY SANDA NEW TECH
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