CN103011363B - 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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- CN103011363B CN103011363B CN201210548550.8A CN201210548550A CN103011363B CN 103011363 B CN103011363 B CN 103011363B CN 201210548550 A CN201210548550 A CN 201210548550A CN 103011363 B CN103011363 B CN 103011363B
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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 oil field environment-protection technical field.
Background technology
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 target oil reservoir, increases sweeping phase viscosity, reduces the mobility ratio of displacing fluid and driven liquid, thereby expands swept volume, reaches the object that improves oil recovery factor.Along with the migration of polymers soln in oil reservoir, in output end Produced Liquid, engender certain density polymkeric substance.Output polymkeric substance can cause oil content of wastewater to raise, and intractability strengthens.
Conventionally, oilfield sewage is mainly by adding flocculation agent to coordinate process equipment.Flocculation agent is divided into inorganic, organic and composite flocculation agent, its dissolve after all with a large amount of positive charges, can, in conjunction with electronegative oil droplet and suspended particle in sewage, reach the effect of water purification oil removing.Yet the partially hydrolyzed polyacrylamide in polymer-bearing waste-water, also with a large amount of negative charges, can form a large amount of flosss after flocculation agent and its combination, floss and oil droplet etc. form the greasy filth of viscosity, easily stop up technical process, and cause flocculation agent consumption to strengthen.
Nonionic surface active agent has special cloud point phenomenon.In the aqueous solution, its solubility with temperature rises and is reduced in and while rising to certain temperature value, occurs muddyly, 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 with the Sauerstoffatom in its ehter bond the hydrogen atom in water with hydrogen bond form, be combined and be water-soluble.Hydrogen bonded power a little less than, with temperature, raise and fracture gradually, thereby the solubleness of tensio-active agent in water reduced gradually, while reaching certain temperature, transfer to insoluble and separate out into turbid solution.
The molecule forming while utilizing the nonionic surface active agent (block polyether) of special construction to reach cloud point temperature, drive the oil droplet in sewage to flocculate and remove together with suspended substance, simultaneously not with water in polyacrylamide effect, thereby reach the object 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 sewage more than cloud point temperature, and medicament has little time dispersing and dissolving and separates out, and cannot play corresponding effect.Utilize that nonionic surface active agent that cloud point is higher is composite with it can improve this shortcoming.
Summary of the invention
The treatment process that the object of this invention is to provide a kind of polymer-containing sewage in oil field, the method is utilized the compound of two kinds of non-ionic type medicaments, utilizes amphipathic characteristic and the cloud point phenomenon of nonionic surface active agent, plays the object 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, after then mixing, can carry out oil removing and water purification to polymer-containing sewage in oil field.
In above-mentioned treatment process, described block polyether can be polyoxypropylene-polyox-yethylene-polyoxypropylene block copolymer;
In described polyoxypropylene-polyox-yethylene-polyoxypropylene block copolymer, polyoxyethylated ratio of quality and the number of copies can be 35 ~ 40%, as 35%.
In above-mentioned treatment process, the molecular weight of described block polyether can be 800 ~ 1500, as 1000.
In 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 above-mentioned treatment process, the quality of block polyether and nonionic surface active agent described in 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 above-mentioned treatment process, total quality-volumetric concentration of block polyether, nonionic surface active agent and ethanol described in 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: (1) method of the present invention block polyether used has the effect of cloud point flocculation; (2) block polyether and cloud point temperature are higher nonionic surface active agent is composite can improve its high temperature dispersibility; (3) compound drug (being the mixture of block polyether and nonionic surface active agent) is all non-ionic type, not with sewage in electronegative polyacrylamide work.
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 the embodiment of the present invention 5.
Fig. 6 is the wastewater purifying efficiency in comparative example 1 of the present invention.
Fig. 7 is the wastewater purifying efficiency in comparative example 2 of the present invention, 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
The experimental technique using 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.
Polyoxypropylene-polyox-yethylene-polyoxypropylene block copolymer (PPO-PEO-PPO) used in 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, purchased from oil recovery technique service company of CNOOC.
Nonionic surface active agent used 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, purchased from Sigma; The molecular weight of TWEEN-20 is 1228, and cloud point is 76 ° of C, is purchased from Sigma; 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; 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, containing 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, after taking-up, add HY-1, Triton X-100 and ethanol, 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, known, after processing, water quality is better.
Embodiment 2, sewage purification
Get 25mL Oil Field sewage, preheating under 68 ° of C, after taking-up, add HY-1, Triton X-100 and ethanol, 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, known, after processing, water quality is better.
Embodiment 3, sewage purification
Get 25mL Oil Field sewage, preheating under 68 ° of C, after taking-up, add HY-1, TWEEN 20 and ethanol, 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, known, after processing, water quality is better.
Embodiment 4, sewage purification
Get 25mL Oil Field sewage, preheating under 68 ° of C, after taking-up, add HY-1, TWEEN 20 and ethanol, 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, known, after processing, water quality is good.
Embodiment 5, sewage purification
Get 25mL Oil Field sewage, preheating under 68 ° of C, after taking-up, add HY-1, Pluronic 10R5 and ethanol, 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, known, after processing, water quality is good.
Comparative example 1,
Get 25mL Oil Field sewage, preheating under 68 ° of C, adds HY-1, Triton X-114 and ethanol after taking-up, 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, and treatment effect as shown in Figure 6, known, after processing, water quality is without considerable change, because experiment sewage temperature is 68 ° of C, Triton X-114 cloud point is 23 ° of C, host HY-1 is not played to good dissemination.
Comparative example 2,
Get 25mL Oil Field sewage, preheating under 68 ° of C, after taking-up, add respectively the mixture of HY-1 and ethanol and the mixture of Triton X-100 and ethanol, 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 shown in Figure 7, known, and after processing, water quality is without considerable change.
Claims (4)
1. a treatment process for 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, after then mixing, can carry out oil removing and water purification to polymer-containing sewage in oil field;
Described nonionic surface active agent is polyethylene glycol-propylene glycol-polyethyleneglycol block copolymer, octyl phenyl Soxylat A 25-7 or tween 20;
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).
2. treatment process according to claim 1, is characterized in that: described block polyether is polyoxypropylene-polyox-yethylene-polyoxypropylene block copolymer.
3. treatment process according to claim 2, is characterized in that: the molecular weight of described block polyether is 800～1500.
4. according to the treatment process described in any one in claim 1-3, it is characterized in that: total quality-volumetric concentration of block polyether, nonionic surface active agent and ethanol described in described polymer-bearing waste-water is 300mg/L～500mg/L.
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| 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 |
| CN105329999B (en) * | 2015-12-09 | 2017-08-25 | 中国海洋石油总公司 | A kind of chemical treatment method of polymer-bearing waste-water |
| 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 |
| 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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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 |