CN103011363A - Treatment method for polymer-bearing wastewater in oil field - Google Patents
Treatment method for polymer-bearing wastewater in oil field Download PDFInfo
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- CN103011363A CN103011363A CN2012105485508A CN201210548550A CN103011363A CN 103011363 A CN103011363 A CN 103011363A CN 2012105485508 A CN2012105485508 A CN 2012105485508A CN 201210548550 A CN201210548550 A CN 201210548550A CN 103011363 A CN103011363 A CN 103011363A
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- block polyether
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Abstract
The invention discloses a treatment method for polymer-bearing wastewater in an oil field. The method comprises the following steps: adding block polyether, non-ionic surface active agent and ethanol into polymer-bearing wastewater in the oil field; mixing uniformly; and carrying out deoiling and water purification on polymer-bearing wastewater in the oil field. The method has the advantages that (1), block polyether adopted in the method has a cloud point flocculation effect; (2), when block polyether is compounded with the non-ionic surface active agent with higher cloud point temperature, the high-temperature dispersivity of block polyether can be improved; and (3) the compounded material (the compound of block polyether and non-ionic surface active agent) is also non-ionic, so as not to react with polyacrylamide with negative electricity in wastewater.
Description
Technical field
The present invention relates to a kind for the treatment of process of polymer-containing sewage in oil field, 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 increases sweeping phase viscosity by inject certain density water-soluble portion hydro-polyacrylamide solution to the target oil reservoir, reduces the mobility ratio of displacing fluid and driven liquid, thereby enlarges swept volume, reaches the purpose that improves oil recovery factor.Along with the migration of polymers soln in oil reservoir, engender certain density polymkeric substance in the output end Produced Liquid.The output polymkeric substance can cause oil content of wastewater to raise, and intractability strengthens.
Usually, oilfield sewage mainly cooperates process equipment by adding flocculation agent.Flocculation agent is divided into inorganic, organic and composite flocculation agent all with a large amount of positive charges, can in conjunction with electronegative oil droplet and suspended particle in the sewage, reach the effect of water purification oil removing after its dissolving.Yet the partially hydrolyzed polyacrylamide in the polymer-bearing waste-water can form a large amount of flosss also with a large amount of negative charges after flocculation agent and its combination, and floss and oil droplet etc. form the greasy filth of viscosity, stop up easily technical process, and cause the flocculation agent consumption to strengthen.
Nonionic surface active agent has special cloud point phenomenon.Namely its solubility with temperature rises and is reduced in and occurs muddyly when rising to the certain temperature value in the aqueous solution, and through placing or centrifugally obtaining two liquid phases, this temperature is referred to as the cloud point (cloud point) of this tensio-active agent.Nonionic surface active agent is combined with the hydrogen bond form with the hydrogen atom of the Sauerstoffatom in its ehter bond in water and is water-soluble.Hydrogen bonded power a little less than, raise and gradually fracture with temperature, thereby the solubleness of tensio-active agent in water reduced gradually, transfer to insoluble when reaching certain temperature and separate out into turbid solution.
The molecule that utilizes the nonionic surface active agent (block polyether) of special construction to form when reaching cloud point temperature, oil droplet in the drive sewage and suspended substance flocculate together and remove, simultaneously not with water in the polyacrylamide effect, thereby reach the purpose of disposing of sewage, can be called cloud point flocculation (cloud point flocculation, CPF).But the block polyether that concentration is higher or its stoste join in the above sewage of cloud point temperature, and medicament has little time dispersing and dissolving and namely separates out, and can't play corresponding effect.Utilize that the higher nonionic surface active agent of cloud point is composite with it then to improve this shortcoming.
Summary of the invention
The treatment process that the purpose of this invention is to provide a kind of polymer-containing sewage in oil field, the method are utilized the compound of two kinds of non-ionic type medicaments, utilize amphipathic characteristic and the cloud point phenomenon of nonionic surface active agent, play the purpose of flocculation, oil removing, clear water.
The treatment process of a kind of polymer-containing sewage in oil field provided by the present invention comprises the steps:
In polymer-containing sewage in oil field, add block polyether, nonionic surface active agent and ethanol, can carry out oil removing and water purification to polymer-containing sewage in oil field after then mixing.
In the above-mentioned treatment process, described block polyether can be polyoxypropylene-polyox-yethylene-polyoxypropylene block copolymer;
Polyoxyethylated ratio of quality and the number of copies can be 35 ~ 40% in described polyoxypropylene-polyox-yethylene-polyoxypropylene block copolymer, such as 35%.
In the above-mentioned treatment process, the molecular weight of described block polyether can be 800 ~ 1500, such as 1000.
In the above-mentioned treatment process, described nonionic surface active agent can be polypropylene glycol-PLURONIC F-127 (Pluronic 10R5), octyl phenyl Soxylat A 25-7 (Triton X-100), tween 20 (TWEEN20) or di sec-butylphenol Soxylat A 25-7 (Triton X-114).
In the above-mentioned treatment process, the quality of block polyether and nonionic surface active agent described in the described polymer-bearing waste-water and can be (1 ~ 1.1) with the ratio of quality and the number of copies of described ethanol: 1, specifically can be 1:1 or 1.1:1;
The ratio of quality and the number of copies of described block polyether and nonionic surface active agent can be 1:(0.1 ~ 1), specifically can be 1:0.1 or 1:1.
In the above-mentioned treatment process, total quality-volumetric concentration of block polyether, nonionic surface active agent and ethanol described in the described polymer-bearing waste-water can be 300mg/L ~ 500mg/L, specifically can be 300mg/L ~ 400mg/L, 300mg/L, 400mg/L or 500mg/L.
The present invention has the following advantages: the used block polyether of (1) method of the present invention has the effect of cloud point flocculation; (2) nonionic surface active agent that block polyether and cloud point temperature are higher is composite to improve its high temperature dispersibility; (3) compound drug (being the mixture of block polyether and nonionic surface active agent) all is non-ionic type, not with sewage in electronegative polyacrylamide work.
Description of drawings
Fig. 1 is the wastewater purifying efficiency in the embodiment of the invention 1.
Fig. 2 is the wastewater purifying efficiency in the embodiment of the invention 2.
Fig. 3 is the wastewater purifying efficiency in the embodiment of the invention 3.
Fig. 4 is the wastewater purifying efficiency in the embodiment of the invention 4.
Fig. 5 is the wastewater purifying efficiency in the embodiment of the invention 5.
Fig. 6 is the wastewater purifying efficiency in the Comparative Examples 1 of the present invention.
Fig. 7 is the wastewater purifying efficiency in the Comparative Examples 2 of the present invention, the effect when wherein the 2nd row sample is depicted as the mixture that adopts HY-1 and ethanol, the effect of the 3rd row sample when adopting the mixture of Triton X-100 and ethanol.
Embodiment
Employed experimental technique is ordinary method if no special instructions among the following embodiment.
Used material, reagent etc. if no special instructions, all can obtain from commercial channels among the following embodiment.
Polyoxypropylene-polyox-yethylene-polyoxypropylene block copolymer (PPO-PEO-PPO) used among the following embodiment is designated as HY-1, and wherein the ratio of quality and the number of copies of PEO is 35%, and its molecular weight is 1000, and cloud point is 21 ° of C, available from oil recovery technique service company of CNOOC.
Used nonionic surface active agent is polyethylene glycol-propylene glycol-polyethyleneglycol block copolymer, TWEEN-20, octyl phenyl Soxylat A 25-7 and di sec-butylphenol Soxylat A 25-7; Wherein (PPG-PEG-PPG) is designated as Pluronic 10R5, and wherein the ratio of quality and the number of copies of PEG is 50%, and its molecular weight is 2000, and cloud point is 69 ° of C, available from Sigma; The molecular weight of TWEEN-20 is 1228, and cloud point is 76 ° of C, is purchased from Sigma; The octyl phenyl Soxylat A 25-7 is designated as Triton X-100, and its structural formula is t-Oct-C
6H
4-(OCH
2CH
2)
xOH, x=9 ~ 10, cloud point is 65 ° of C, is purchased from Sigma; The di sec-butylphenol Soxylat A 25-7 is designated as Triton X-114, and its structure is (C
2H
4O)
nC
14H
22O, n=7 or 8, cloud point is 23 ° of C.
Sewage is Oil Field sewage, contains poly-about 100mg/L, the about 4000mg/L of oil-containing.
Embodiment 1, sewage purification
Get 25mL Oil Field sewage, preheating under 68 ° of C, add HY-1, Triton X-100 and ethanol after taking out, total quality-volumetric concentration of three kinds of materials is 300mg/L, the quality proportioning 1:1:2 of HY-1, Triton X-100 and ethanol wherein, then hand 1min mixes, and treatment effect is as shown in Figure 1, as can be known, water quality is better after the processing.
Embodiment 2, sewage purification
Get 25mL Oil Field sewage, preheating under 68 ° of C, add HY-1, Triton X-100 and ethanol after taking out, total quality-volumetric concentration of three kinds of materials is 300mg/L, the quality proportioning 1:0.1:1 of HY-1, Triton X-100 and ethanol wherein, then hand 1min mixes, and treatment effect is as shown in Figure 2, as can be known, water quality is better after the processing.
Embodiment 3, sewage purification
Get 25mL Oil Field sewage, preheating under 68 ° of C, add HY-1, TWEEN 20 and ethanol after taking out, total quality-volumetric concentration of three kinds of materials is 400mg/L, the quality proportioning 1:1:2 of HY-1, TWEEN 20 and ethanol wherein, then hand 1min mixes, and treatment effect is as shown in Figure 3, as can be known, water quality is better after the processing.
Embodiment 4, sewage purification
Get 25mL Oil Field sewage, preheating under 68 ° of C, add HY-1, TWEEN 20 and ethanol after taking out, total quality-volumetric concentration of three kinds of materials is 400mg/L, the quality proportioning 1:0.1:1 of HY-1, TWEEN 20 and ethanol wherein, then hand 1min mixes, and treatment effect is as shown in Figure 4, as can be known, water quality is good after the processing.
Embodiment 5, sewage purification
Get 25mL Oil Field sewage, preheating under 68 ° of C, add HY-1, Pluronic 10R5 and ethanol after taking out, total quality-volumetric concentration of three kinds of materials is 500mg/L, the quality proportioning 1:1:2 of HY-1, Pluronic 10R5 and ethanol wherein, then hand 1min mixes, and treatment effect is as shown in Figure 5, as can be known, water quality is good after the processing.
Comparative Examples 1,
Get 25mL Oil Field sewage, preheating under 68 ° of C adds HY-1, Triton X-114 and ethanol after taking out, and total quality-volumetric concentration of three kinds of materials is 500mg/L, the quality proportioning 1:1:2 of HY-1, Triton X-114 and ethanol wherein, then hand 1min mixes, treatment effect as shown in Figure 6, as can be known, water quality is without considerable change after processing, because the experiment sewage temperature is 68 ° of C, Triton X-114 cloud point is 23 ° of C, host HY-1 is not played preferably dissemination.
Comparative Examples 2,
Get 25mL Oil Field sewage, preheating under 68 ° of C, add respectively the mixture of HY-1 and ethanol and the mixture of Triton X-100 and ethanol after the taking-up, quality-the volumetric concentration of these two kinds of mixtures is 500mg/L, and wherein the quality proportioning of HY-1 and ethanol is 1:1, and the quality proportioning of Triton X-100 and ethanol is 1:1, then hand 1min mixes, treatment effect as can be known, is processed rear water quality without considerable change as shown in Figure 7.
Claims (6)
1. the treatment process of a polymer-containing sewage in oil field comprises the steps:
In polymer-containing sewage in oil field, add block polyether, nonionic surface active agent and ethanol, can carry out oil removing and water purification to polymer-containing sewage in oil field after then mixing.
2. treatment process according to claim 1, it is characterized in that: described block polyether is polyoxypropylene-polyox-yethylene-polyoxypropylene block copolymer.
3. treatment process according to claim 2, it is characterized in that: the molecular weight of described block polyether is 800 ~ 1500.
4. each described treatment process according to claim 1-3 is characterized in that: described nonionic surface active agent is polyethylene glycol-propylene glycol-polyethyleneglycol block copolymer, octyl phenyl Soxylat A 25-7 or tween 20.
5. each described treatment process according to claim 1-4 is characterized in that: the quality of described block polyether and nonionic surface active agent and with the ratio of quality and the number of copies of described ethanol be (1 ~ 1.1): 1;
The ratio of quality and the number of copies of described block polyether and nonionic surface active agent is 1:(0.1 ~ 1).
6. each described treatment process according to claim 1-5 is characterized in that: total quality-volumetric concentration of block polyether, nonionic surface active agent and ethanol described in the described polymer-bearing waste-water is 300mg/L ~ 500mg/L.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105000730A (en) * | 2015-07-31 | 2015-10-28 | 合肥智凯电子科技有限公司 | Environment-friendly oily water purifying system |
| CN105329999A (en) * | 2015-12-09 | 2016-02-17 | 中国海洋石油总公司 | Method for chemical treatment of polymer-containing sewage |
| CN108993386A (en) * | 2018-07-31 | 2018-12-14 | 郑州工程技术学院 | A kind of cleanser and preparation method thereof for disposing polluted water in oil |
| CN114426625A (en) * | 2020-10-14 | 2022-05-03 | 中国石油化工股份有限公司 | Vinyl acetate-ethylene copolymer emulsion with high solid content and low viscosity and preparation method thereof |
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| JP2001025608A (en) * | 1999-07-15 | 2001-01-30 | Ebara Corp | Polymeric flocculation auxiliary agent for water treatment and production thereof |
| CN102318602A (en) * | 2011-07-13 | 2012-01-18 | 南京扬子鸿利源化学品有限责任公司 | Emulsifying agent having stabilizing effect in clethodim emulsifiable concentrates and preparation method thereof |
| CN102558937A (en) * | 2011-12-26 | 2012-07-11 | 滁州四新科技有限责任公司 | Economical coating antifoaming agent |
| CN102627344A (en) * | 2012-04-11 | 2012-08-08 | 中国海洋石油总公司 | Method for treating polymer-driven oilfield sewage |
-
2012
- 2012-12-17 CN CN201210548550.8A patent/CN103011363B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001025608A (en) * | 1999-07-15 | 2001-01-30 | Ebara Corp | Polymeric flocculation auxiliary agent for water treatment and production thereof |
| CN102318602A (en) * | 2011-07-13 | 2012-01-18 | 南京扬子鸿利源化学品有限责任公司 | Emulsifying agent having stabilizing effect in clethodim emulsifiable concentrates and preparation method thereof |
| CN102558937A (en) * | 2011-12-26 | 2012-07-11 | 滁州四新科技有限责任公司 | Economical coating antifoaming agent |
| CN102627344A (en) * | 2012-04-11 | 2012-08-08 | 中国海洋石油总公司 | Method for treating polymer-driven oilfield sewage |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105000730A (en) * | 2015-07-31 | 2015-10-28 | 合肥智凯电子科技有限公司 | Environment-friendly oily water purifying system |
| CN105329999A (en) * | 2015-12-09 | 2016-02-17 | 中国海洋石油总公司 | Method for chemical treatment of polymer-containing sewage |
| CN108993386A (en) * | 2018-07-31 | 2018-12-14 | 郑州工程技术学院 | A kind of cleanser and preparation method thereof for disposing polluted water in oil |
| CN114426625A (en) * | 2020-10-14 | 2022-05-03 | 中国石油化工股份有限公司 | Vinyl acetate-ethylene copolymer emulsion with high solid content and low viscosity and preparation method thereof |
| CN114426625B (en) * | 2020-10-14 | 2023-10-13 | 中国石油化工股份有限公司 | High-solid-content low-viscosity vinyl acetate-ethylene copolymer emulsion and preparation method thereof |
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| CN103011363B (en) | 2014-03-19 |
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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 |