CN102925131B - Method for preparing polymer injection fluid from clear water and polymer-containing sewage - Google Patents
Method for preparing polymer injection fluid from clear water and polymer-containing sewage Download PDFInfo
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- CN102925131B CN102925131B CN201210423667.3A CN201210423667A CN102925131B CN 102925131 B CN102925131 B CN 102925131B CN 201210423667 A CN201210423667 A CN 201210423667A CN 102925131 B CN102925131 B CN 102925131B
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Abstract
The invention relates to a method for preparing a polymer mother solution from clear water and polymer-containing sewage and preparing a polymer injection fluid from polymer-containing sewage, which is implemented by the following steps: preparing the polymer mother solution from clear water and polymer-containing sewage, and preparing the polymer injection fluid from the polymer mother solution and polymer-containing sewage. The method specifically comprises the following steps: mixing 60-80 parts of polymer-containing sewage (the polymer concentration is 200-1000 mg/L) and 20-40 parts of clear water at normal temperature, mixing with 2-20*10<-3> part of sodium hydroxide, finally adding 0.45-0.5 part of 30%-hydrolyzed polyacrylamide with the molecular weight of 200 million, and evenly stirring to obtain the polymer mother solution of which the concentration is 5000 mg/L; and mixing 500-560 parts of polymer-containing sewage (the polymer concentration is 200-1000 mg/L) and 400-440 parts of the polymer mother solution (the polymer concentration is 5000 mg/L) at normal temperature to obtain the polymer injection fluid of which the concentration is 2200 mg/L.
Description
Technical field
The present invention relates to oilfield polymer flooding tertiary oil recovery technology field, specifically method and the application of a kind of clear water and polymer-bearing waste-water prepared polymer injection liquid.
Background technology
At present, oil field generally adopts clear water preparation mother liquor in prepared polymer method, the mode of dilution of sewage polymers soln, and the prolonged application of this injection allocation mode has caused adopts note imbalance.Particularly current, China's shortage of fresh water, clear water is joined a large amount of Freshwater resources of mother liquor consumption, and along with the continuous expansion of polymer flooding scale, recovered water also constantly increases containing the amount of polywater, a large amount of sewage more than needed is reinjection into reservoir all, this sewage will pass through deep purifying and could arrange outward, and this will increase a large amount of manpower and materials, and the flocculation treatment technology of traditional polymer-bearing waste-water will produce a large amount of poly-greasy filth that contains, to environment, cause secondary pollution, this processing mode is also difficult for applying for a long time.
Current injection allocation mode is to adopt clear water to join mother liquor, if adopt common sewage directly to substitute clear water, because the salinity of sewage is high, generally more than 6000 mg/L, some local sewage salinity is up to more than 10000 mg/L, simultaneously Ca
2+, Mg
2+content is high, up to 400mg/L left and right, causes polymer viscosity loss serious; To the research of sewage, can find in recent years, in sewage, often also contain the reducing substances Fe of different amounts
2+, S
2-and SRB bacterium, reducing substances Fe
2+and S
2-more remarkable to joining poly-viscosity influence; Fe
2+and S
2-be corrosion and the product of SRB metabolism, so the existence of SRB also becomes the principal element of joining poly-viscosity reduction, therefore, can not adopt the alternative clear water of common sewage to join poly-mode.
Widespread use along with polymer flooding, poly-drive water exit amount constantly increases, account for the more than 40% of total liquid measure, in Produced Liquid, also containing the reservation polymkeric substance of some, through coagulation-flocculation method, process produce low containing poly-greasy filth temperature, airtight anoxybiotic is the best environment of the breeding of SRB, the SRB of sewage is exceeded standard, and then impact joins poly-viscosity, therefore, utilize sewage after this processing to join and poly-ly can not meet the requirement of injection allocation fluid viscosity.
For this present situation, should find a kind of new mode, solve shortage of fresh water, adopt the unbalanced problem of note.Research premenstruum finds that polymer-bearing waste-water substitutes clear water injection allocation and can improve viscosity, further develops the application prospect of polymer-bearing waste-water, can solve above two large problems.
Summary of the invention
The object of this invention is to provide a kind of clear water and the method for polymer-bearing waste-water prepared polymer injection liquid and the technical scheme of application, solve that the prepared polymer injection liquid viscosity that prior art exists is little, polymer loading large, the problem of clear water resource shortage, the low restriction balancing between injection and production of oil displacement efficiency.
Technical scheme of the present invention is achieved in the following ways:
Prepared polymer injection liquid of the present invention is divided into two step preparations, first uses clear water and polymer-bearing waste-water prepared polymer mother liquor, then is mixed with polymer injection liquid with polymer mother liquor and polymer-bearing waste-water; It is formulated as follows:
A, polymer mother liquor preparation
Polymkeric substance: clear water: polymer-bearing waste-water: sodium hydroxide=0.45-0.5:20-40:60-80:2-20 * 10
-3
Its proportioning is massfraction ratio, together with polymer-bearing waste-water 60-80 part that to select containing poly-concentration be 200-1000mg/L is uniformly mixed at normal temperatures with clear water 20-40 part, then with sodium hydroxide 2-20 * 10
-3part is uniformly mixed together, and the molecular weight that finally adds 0.45-0.5 part is 2,000 ten thousand, and the polyacrylamide of hydrolysis < 30% stirs and is mixed with polymer mother liquor, and its concentration is 5000mg/L
B, polymer injection fluid preparation
Polymer mother liquor: polymer-bearing waste-water=400-440:500-560
Its proportioning is massfraction ratio, selects containing gathering polymer-bearing waste-water 500-560 part that concentration is 200-1000mg/L and is mixed into polymer injection liquid with the polymer mother liquor 400-440 part that is 5000mg/L containing poly-concentration at normal temperatures, and its concentration is 5000mg/L.
Through in the experiment of lab simulation polymer flooding efficiency, adopt the polymer injection liquid of the present invention's preparation, poly-driving improved recovery ratio 11%, and overall recovery factor reaches 56.38%.
Embodiment
For further disclosing technical scheme of the present invention, below in conjunction with specific embodiment, elaborate:
Polymer mother liquor preparation
A, the clear water of getting 400g and 600g polymer-bearing waste-water are mixed into the mother liquor water of 1000g; Here containing polywater, can select containing poly-concentration is the polymer-bearing waste-water of 200-1000 mg/L;
B, to the NaOH that adds 160 mg in mother liquor water, place for some time;
C, in mother liquor water, add the polymer formulation of 5g to become mother liquor.
The preparation of polymer injection liquid
Get the mother liquor 440mg preparing, the polymer-bearing waste-water dilution that is 200mg/L containing poly-concentration that adds 560mg, dilution post polymerization substrate concentration 2200 mg/L.
Polymkeric substance: polyacrylamide, molecular weight 2,000 ten thousand, degree of hydrolysis: < 30%
Embodiment 1
When sewage salinity 12000mg/L left and right, utilize the sewage containing poly-400 mg/L partly to substitute the polymers soln that clear water preparation is 5000mg/L containing poly-amount, the pretreating agent that adds 70mg/L, again with gathering (243mg/L) dilution of sewage mother liquor low containing, diluent concentration is 2200mg/L, and the best of investigating its clear water substitutes amount.While substituting clear water with the 70% sewage water containing poly-400 mg/L, viscosity reaches 45mPa.s, and the clear water of in situ measurement to join the polymer solution viscosity of dilution of sewage suitable.When the polymer-bearing waste-water with 60% substitutes clear water, viscosity reaches 46.6 mPa.s, higher than scene, provides clear water to join the viscosity of dilution of sewage.In order to guarantee to join poly-viscosity, should select rinse dosage 30-40%, substitute clear water amount 60-70%.
Embodiment 2
When sewage salinity 12000mg/L left and right, utilize the sewage containing poly-500 mg/L partly to substitute the polymers soln that clear water preparation is 5000mg/L containing poly-amount, the pretreating agent that adds 160mg/L, again with gathering (243mg/L) dilution of sewage mother liquor low containing, diluent concentration is 2200mg/L, and the best of investigating its clear water substitutes amount.While substituting clear water with the 70% sewage water containing poly-500 mg/L, viscosity reaches 46.4mPa.s, higher than scene, provides clear water to join the viscosity of dilution of sewage.In order to guarantee to join poly-viscosity, should select rinse dosage 30%, substitute clear water amount 70%.
Embodiment 3
When sewage salinity 12000mg/L left and right, utilize the sewage containing poly-600 mg/L partly to substitute the polymers soln that clear water preparation is 5000mg/L containing poly-amount, the pretreating agent that adds 160mg/L, again with gathering (243mg/L) dilution of sewage mother liquor low containing, diluent concentration is 2200mg/L, and the best of investigating its clear water substitutes amount.While substituting clear water with the 70% sewage water containing poly-600 mg/L, viscosity reaches 45.1mPa.s, and the clear water of in situ measurement to join the polymer solution viscosity of dilution of sewage suitable.While substituting clear water with the 80% sewage water containing poly-600 mg/L, viscosity reaches 46.6 mPa.s, higher than scene, provides clear water to join the viscosity of dilution of sewage.In order to guarantee to join poly-viscosity, should select rinse dosage 20-30%, substitute clear water amount 70-80%.
Embodiment 4
In the experiment of lab simulation polymer flooding efficiency, employing is joined mother liquor containing poly-600 mg/L sewage and with this, containing poly-water-reducible polymers soln, is carried out displacement test again, its injection allocation concentration is 1500mg/L, and water drive water adopts Gudao area of Shengli Oilfield local water and polymer-bearing waste-water; Oil adopts Gudao area of Shengli Oilfield simulated formation oil, and at 70 ℃ of experimental temperatures, viscosity is 60CP; Three layers of heterogeneous artificial cores piece, specification 4.5 * 4.5 * 30 cm, each layer thickness is identical, and rate of permeation is respectively 500,1000,1500MD; Each stage recovery ratio of its displacement of reservoir oil is in Table 1.Poly-driving improved recovery ratio 11.00%, and containing poly-waterflood recovery efficiency factor 5.46%, overall recovery factor reaches 56.38%.Polymer-bearing waste-water substitutes clear water and joins and poly-ly can obviously improve recovery ratio.
Each stage recovery ratio of the indoor oil displacement experiment of table 1
| Slug | Consumption (PV) | Recovery ratio/% |
| Local water (extraction sewage) drives | 2.12 | 34.54 |
| Containing polywater, join mother liquor (5000mg/L) containing polywater dilute polymer solution (1500mg/L) polymer flooding | 0.5 | 11.00 |
| Containing polywater, drive | 0.3 | 5.46 |
| Follow-up local water (extraction sewage) drives | 1.84 | 5.38 |
| Overall recovery factor/% | ? | 56.38 |
Claims (1)
1. the method for a clear water and polymer-bearing waste-water prepared polymer mother liquor and polymer-bearing waste-water prepared polymer injection liquid, comprise polymer mother liquor preparation and polymer injection fluid preparation, first use clear water and polymer-bearing waste-water prepared polymer mother liquor, then be mixed with polymer injection liquid with polymer mother liquor and polymer-bearing waste-water; It is formulated as follows:
A, polymer mother liquor preparation
Polymkeric substance: clear water: polymer-bearing waste-water: sodium hydroxide=0.45-0.5:20-40:60-80:2-20 * 10
-3
Its proportioning is massfraction ratio, together with polymer-bearing waste-water 60-80 part that to select containing poly-concentration be 200-1000mg/L is uniformly mixed at normal temperatures with clear water 20-40 part, then with sodium hydroxide 2-20 * 10
-3part is uniformly mixed together, and the molecular weight that finally adds 0.45-0.5 part is 2,000 ten thousand, and the polyacrylamide of hydrolysis < 30% stirs and is mixed with polymer mother liquor, and its concentration is 5000mg/L;
?b, polymer injection fluid preparation
Polymer mother liquor: polymer-bearing waste-water=400-440:500-560
Its proportioning is massfraction ratio, selects containing gathering the polymer-bearing waste-water 500-560 that concentration is 200-1000mg/L and is mixed into polymer injection liquid with the polymer mother liquor 400-440 part that is 5000mg/L containing poly-concentration at normal temperatures, and its concentration is 2200mg/L.
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| CN201210423667.3A CN102925131B (en) | 2012-10-30 | 2012-10-30 | Method for preparing polymer injection fluid from clear water and polymer-containing sewage |
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| CN102925131B true CN102925131B (en) | 2014-12-03 |
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| CN105198187B (en) * | 2015-10-08 | 2017-06-30 | 中国海洋石油总公司 | A kind of dispersion and processing method containing poly- sludge |
| CN111925782B (en) * | 2019-05-13 | 2023-04-07 | 中国石油化工股份有限公司 | Sand-containing polymer-containing oil field waste liquid profile control recycling treatment method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2274740C1 (en) * | 2005-05-03 | 2006-04-20 | Открытое акционерное общество "Акционерная нефтяная компания "Башнефть" | Method for oil production from bed |
| CN101003726A (en) * | 2006-06-27 | 2007-07-25 | 中国石化股份胜利油田分公司孤岛采油厂 | Method for preparing and using shift drive agent of reversed phase latex of polyacrylamide |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2274740C1 (en) * | 2005-05-03 | 2006-04-20 | Открытое акционерное общество "Акционерная нефтяная компания "Башнефть" | Method for oil production from bed |
| CN101003726A (en) * | 2006-06-27 | 2007-07-25 | 中国石化股份胜利油田分公司孤岛采油厂 | Method for preparing and using shift drive agent of reversed phase latex of polyacrylamide |
Non-Patent Citations (2)
| Title |
|---|
| 污水配制聚合物对提高采收率影响研究;马海禹;《科学技术与工程》;20120731;第12卷(第19期);第4766-4769页 * |
| 马海禹.污水配制聚合物对提高采收率影响研究.《科学技术与工程》.2012,第12卷(第19期),第4766-4769111. * |
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