CN102689941B - Method for treating sewage in polymer flooding oilfield - Google Patents
Method for treating sewage in polymer flooding oilfield Download PDFInfo
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- CN102689941B CN102689941B CN 201210171370 CN201210171370A CN102689941B CN 102689941 B CN102689941 B CN 102689941B CN 201210171370 CN201210171370 CN 201210171370 CN 201210171370 A CN201210171370 A CN 201210171370A CN 102689941 B CN102689941 B CN 102689941B
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Abstract
The invention discloses a method for treating sewage in a polymer flooding oilfield. The method comprises the following steps: adding a Gemini surface active agent and positive ion polyacrylamide into the sewage in a polymer flooding oilfield; and then mixing uniformly to remove oil and purify water in the polymer flooding oilfield. The Gemini surface active agent is setanol polyethenoxy ether based dimethyl and octyl ammonium chloride. The method provided by the invention has the advantages that the Gemini surface active agent has high interfacial activity and zwitterionic hydrophile head groups, thereby realizing one agent with two functions; the Gemini surface active agent and polyacrylamide are water-soluble and can be fully dissolved in water to play effects; the oil removal and water purification effects of the invention is better than those of a single-component agent; and when the method is applied to polymer-bearing sewage, no adhesive floccules is generated.
Description
Technical field
The present invention relates to a kind of polymer flooding oil field sewage water treatment method, belong to the oil field environment-protection technical field.
Background technology
The enhancing oil recovery in polymer flooding technology on land and offshore oilfield all obtained significant steady oil control water effect, become an important means of oilfield stimulation.Polymer flooding, by inject certain density water-soluble portion hydro-polyacrylamide solution to the target oil reservoir, increases sweeping phase viscosity, reduces the mobility ratio of displacing fluid and driven liquid, thereby enlarges swept volume, reaches the purpose that improves oil recovery factor.
Often there is the partially hydrolyzed polyacrylamide of higher concentration in polymer flooding, make polymer-bearing waste-water become a kind of more complicated stable profit system, emulsification of crude oil is serious, and profit is difficult to separate by natural subsidence, and it is difficult to process than the water filling drive extraction sewage more.Aspect dehydrating of crude oil, show as: in dehydration rate reduction, sewage Quality Down, water, have impurity to generate, water-oil interface are unintelligible and middle layer is arranged, the electro-dewatering system can not normally be moved.Aspect sewage disposal, show as: Produced Liquid viscosity increases, oily water separation speed slows down, sewage treatment capacity descends, the formation of O/W type milk sap in addition, residual partially hydrolyzed polyacrylamide and cationic flocculant affect the flocculating settling effect while coexisting, cause the medicament chemical feeding quantity significantly to increase, oil content of wastewater and suspension content severe overweight.Water cleaning agent for water-drive field sewage can't reach treatment effect preferably in the past, need to be according to the characteristics development of new sewage water treatment method of polymer-bearing waste-water.
Summary of the invention
The purpose of this invention is to provide a kind of polymer flooding oil field sewage water treatment method, utilize a kind of Gemini tensio-active agent interfacial activity and have nonionic concurrently and the dual property of cationic head base preferably, the absorption and the bridging action that coordinate cationic polyacrylamide, with the stable polymer-bearing waste-water effect of complexity, play the effect of oil removing, water purification.
A kind of polymer flooding provided by the present invention oil field sewage water treatment method, comprise the steps:
Add Gemini tensio-active agent and cationic polyacrylamide in the sewage of polymer flooding oil field, then mixed and can carry out oil removing and water purification to polymer flooding oil field sewage.
In above-mentioned treatment process, described Gemini tensio-active agent specifically can be hexadecanol polyoxyethylene ether dimethyl-octa alkyl ammomium chloride, and its structural formula is suc as formula shown in I,
The formula I.
In above-mentioned treatment process, the molecular weight of described cationic polyacrylamide can be 5,000,000 ~ 7,000,000.
In above-mentioned treatment process, described in the sewage of described polymer flooding oil field, the quality-volumetric concentration of Gemini tensio-active agent can be 50mg/L ~ 200mg/L, specifically can be 50mg/L, 100mg/L, 150mg/L or 200mg/L.
In above-mentioned treatment process, described in the sewage of described polymer flooding oil field, the quality-volumetric concentration of cationic polyacrylamide can be 50mg/L ~ 200mg/L, specifically can be 50mg/L.
Treatment process provided by the invention has following advantage: (1) takes full advantage of the characteristics of the high interfacial activity of Gemini tensio-active agent and hydrophilic base of both sexes, potion multiple-effect; (2) medicament (Gemini tensio-active agent and cationic polyacrylamide) is water-soluble, can fully be dissolved in sewage and play a role; (3) oil removing, purifying water effect are better than using separately the single component medicament; (4), for polymer-bearing waste-water, do not produce a large amount of viscosity flcos.
The accompanying drawing explanation
Fig. 1 is the wastewater purifying efficiency in the embodiment of the present invention 1.
Fig. 2 is the wastewater purifying efficiency in the embodiment of the present invention 2.
Fig. 3 is the wastewater purifying efficiency in the embodiment of the present invention 3.
Fig. 4 is the wastewater purifying efficiency in the embodiment of the present invention 4.
Fig. 5 is the wastewater purifying efficiency in Comparative Examples 1 of the present invention, wherein, is followed successively by from left to right the quality of hexadecanol polyoxyethylene ether dimethyl-octa alkyl ammomium chloride-volumetric concentration respectively 0,50,100,150 and the decontamination effect improving of 200mg/L.
Fig. 6 is the wastewater purifying efficiency in Comparative Examples 2 of the present invention, wherein, and the decontamination effect improving that the quality-volumetric concentration that is followed successively by from left to right FO4800SH is 100mg/L and 200mg/L.
Embodiment
The experimental technique used in following embodiment if no special instructions, is ordinary method.
In following embodiment, material used, reagent etc., if no special instructions, all can obtain from commercial channels.
Gemini tensio-active agent used in the following embodiment of the present invention (hexadecanol polyoxyethylene ether dimethyl-octa alkyl ammomium chloride) is purchased from Henan provincial highway purifying work technology company limited, effective content 33%; Cationic polyacrylamide FO4800SH be purchased from France like gloomy, molecular weight approximately 5,000,000 ~ 7,000,000, cationic degree approximately 80%.
Sewage is the on-the-spot sewage of Bohai Bay Oil, containing the about 100mg/L of partially hydrolyzed polyacrylamide, and the about 1000mg/L of oil-containing.
Embodiment 1, sewage purification
Get 25mL Oil Field sewage, put into 65 ° of C thermostat container insulation 1h, add hexadecanol polyoxyethylene ether dimethyl-octa alkyl ammonium chloride aqueous solution, make its quality-volumetric concentration reach 50mg/L, and hand 1min mixes, then add the FO4800SH aqueous solution, make its quality-volumetric concentration reach 50mg/L, treatment effect is as Fig. 1, known, has certain oil removing clear water effect.
Embodiment 2, sewage purification
Get 25mL Oil Field sewage, put into 65 ° of C thermostat container insulation 1h, add hexadecanol polyoxyethylene ether dimethyl-octa alkyl ammonium chloride aqueous solution, make its quality-volumetric concentration reach 100mg/L, and hand 1min mixes, then add the FO4800SH aqueous solution, make its quality-volumetric concentration reach 50mg/L, treatment effect is as Fig. 2, known, has oil removing clear water effect preferably.
Embodiment 3, sewage purification
Get 25mL Oil Field sewage, put into 65 ° of C thermostat container insulation 1h, add hexadecanol polyoxyethylene ether dimethyl-octa alkyl ammonium chloride aqueous solution, make its quality-volumetric concentration reach 150mg/L, and hand 1min mixes, then add the FO4800SH aqueous solution, make its quality-volumetric concentration reach 50mg/L, treatment effect is as Fig. 3, known, has oil removing clear water effect preferably.
Embodiment 4, sewage purification
Get 25mL Oil Field sewage, put into 65 ° of C thermostat container insulation 1h, add hexadecanol polyoxyethylene ether dimethyl-octa alkyl ammonium chloride aqueous solution, make its quality-volumetric concentration reach 200mg/L, and hand 1min mixes, then add the FO4800SH aqueous solution, make its concentration reach 50mg/L, treatment effect is as Fig. 4, known, has certain oil removing clear water effect.
Comparative Examples 1,
Get 25mL Oil Field sewage, put into 65 ° of C thermostat container insulation 1h, add hexadecanol polyoxyethylene ether dimethyl-octa alkyl ammonium chloride aqueous solution, make its quality-volumetric concentration reach 0,50,100,150 and 200mg/L, and hand 1min mixes, treatment effect, as Fig. 5, as seen from the figure, has no obvious oil removing clear water effect.
Comparative Examples 2,
Get 25mL Oil Field sewage, put into 65 ° of C thermostat containers insulation 1h, add the FO4800SH aqueous solution, make its concentration reach 100mg/L and 200mg/L, and hand 1min mixes, treatment effect is as Fig. 6, and as seen from the figure, oil removing clear water effect is poor.
Claims (4)
1. a polymer flooding oil field sewage water treatment method, comprise the steps:
Add Gemini tensio-active agent and cationic polyacrylamide in the sewage of polymer flooding oil field, then mixed and can carry out oil removing and water purification to polymer flooding oil field sewage; Described Gemini tensio-active agent is hexadecanol polyoxyethylene ether dimethyl-octa alkyl ammomium chloride.
2. treatment process according to claim 1, it is characterized in that: the molecular weight of described cationic polyacrylamide is 5,000,000～7,000,000.
3. treatment process according to claim 1 and 2, it is characterized in that: described in the sewage of described polymer flooding oil field, the quality-volumetric concentration of Gemini tensio-active agent is 50mg/L～200mg/L.
4. treatment process according to claim 1 and 2, it is characterized in that: described in the sewage of described polymer flooding oil field, the quality-volumetric concentration of cationic polyacrylamide is 50mg/L～200mg/L.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102951702A (en) * | 2012-11-13 | 2013-03-06 | 山东泰德新能源有限公司 | Crude-oil sewage treating agent |
| CN106542591A (en) * | 2016-11-04 | 2017-03-29 | 烟台史密得机电设备制造有限公司 | A kind of composite degreaser of polymer flooding water and preparation method thereof |
| CN106495270B (en) * | 2016-11-04 | 2019-06-14 | 烟台史密得机电设备制造有限公司 | A kind of degreaser for polymer flooding water processing |
| CN106495242B (en) * | 2016-11-04 | 2019-06-14 | 烟台史密得机电设备制造有限公司 | A kind of degreaser and preparation method thereof of salt tolerant polymer flooding water |
| CN106565007B (en) * | 2016-11-09 | 2019-10-11 | 烟台索山机械有限公司 | A kind of degreaser of ternary composite flooding water extraction and preparation method thereof |
| CN112194286B (en) * | 2020-10-06 | 2021-08-24 | 南昌市自来水工程有限责任公司 | Sewage purification tank and sewage purification method |
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| CN101279786A (en) * | 2007-04-04 | 2008-10-08 | 中国石油化工股份有限公司 | Method for treatment of oil-bearing waste water |
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| CN101279786A (en) * | 2007-04-04 | 2008-10-08 | 中国石油化工股份有限公司 | Method for treatment of oil-bearing waste water |
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Address after: 100010 Beijing, Chaoyangmen, North Street, No. 25, No. Co-patentee after: CNOOC research institute limited liability company Patentee after: China Offshore Oil Group Co., Ltd. Address before: 100010 Beijing, Chaoyangmen, North Street, No. 25, No. Co-patentee before: CNOOC Research Institute Patentee before: China National Offshore Oil Corporation |
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