CN102925131A - 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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- CN102925131A CN102925131A CN2012104236673A CN201210423667A CN102925131A CN 102925131 A CN102925131 A CN 102925131A CN 2012104236673 A CN2012104236673 A CN 2012104236673A CN 201210423667 A CN201210423667 A CN 201210423667A CN 102925131 A CN102925131 A CN 102925131A
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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, clear water preparation mother liquor is generally adopted in the oil field on the prepared polymer method, and the mode of dilution of sewage polymers soln, the prolonged application of this injection allocation mode have caused to adopt annotates imbalance.Particularly present, 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, the amount that recovered water contains polywater also constantly increases, a large amount of sewage more than needed are reinjection into reservoir all, this sewage will just can efflux through deep purifying, 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, cause secondary pollution to environment, this processing mode also is difficult for applying for a long time.
Present 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 about 400mg/L, causes the polymer viscosity loss serious; Can find the research of sewage in recent years, in sewage, often also contain the reducing substances Fe of different amounts
2+, S
2-And the 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 more than 40% of total liquid measure, the reservation polymkeric substance that also contains some in the Produced Liquid, through the coagulation-flocculation method process to produce to contain poly-greasy filth temperature low, airtight anoxybiotic is the best environment of the breeding of SRB, so that the SRB of sewage exceeds standard, and then impact joins poly-viscosity, therefore, utilizes sewage after this processing to join and poly-ly can not satisfy the requirement of injection allocation fluid viscosity.
For this present situation, should seek a kind of new mode, solve shortage of fresh water, adopt the unbalanced problem of annotating.Research premenstruum finds that polymer-bearing waste-water substitutes the 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 purpose 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 of oil displacement efficiency balancing between injection and production.
Technical scheme of the present invention is achieved in the following ways:
Prepared polymer injection liquid of the present invention is divided into the preparation of two steps, uses first clear water and polymer-bearing waste-water prepared polymer mother liquor, is mixed with polymer injection liquid with polymer mother liquor and polymer-bearing waste-water again; 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 the massfraction ratio, selects that to contain poly-concentration be that polymer-bearing waste-water 60-80 part and clear water 20-40 part of 200-1000mg/L mixes together at normal temperatures, again with sodium hydroxide 2-20 * 10
-3Part mixes together, and the molecular weight that adds at last 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 the massfraction ratio, selects that to contain poly-concentration be that polymer-bearing waste-water 500-560 part of 200-1000mg/L is mixed into polymer injection liquid with polymer mother liquor 400-440 part that to contain poly-concentration be 5000mg/L at normal temperatures, and its concentration is 5000mg/L.
Through in the experiment of lab simulation polymer flooding efficient, 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, elaborate below in conjunction with specific embodiment:
The 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 to select to contain poly-concentration be the polymer-bearing waste-water of 200-1000 mg/L;
B, add the NaOH of 160 mg in the mother liquor water, place for some time;
C, the polymer formulation that adds 5g in the mother liquor water become mother liquor.
The preparation of polymer injection liquid
Get the mother liquor 440mg for preparing, add the polymer-bearing waste-water dilution that containing of 560mg, poly-concentration was 200mg/L, dilution post polymerization substrate concentration 2200 mg/L.
Polymkeric substance: polyacrylamide, molecular weight 2,000 ten thousand, degree of hydrolysis:＜30%
Embodiment 1
When the sewage salinity 12000mg/L left and right sides, the sewage that utilization contains poly-400 mg/L partly substitutes the clear water preparation polymers soln that to contain poly-amount be 5000mg/L, the pretreating agent that adds 70mg/L, again with low poly-(243mg/L) dilution of sewage mother liquor that contains, diluent concentration is 2200mg/L, and the best of investigating its clear water substitutes amount.When substituting clear water with the 70% sewage water that contains 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 substituting clear water with 60% polymer-bearing waste-water, viscosity reaches 46.6 mPa.s, and being higher than the 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 the sewage salinity 12000mg/L left and right sides, the sewage that utilization contains poly-500 mg/L partly substitutes the clear water preparation polymers soln that to contain poly-amount be 5000mg/L, the pretreating agent that adds 160mg/L, again with low poly-(243mg/L) dilution of sewage mother liquor that contains, diluent concentration is 2200mg/L, and the best of investigating its clear water substitutes amount.When substituting clear water with the 70% sewage water that contains poly-500 mg/L, viscosity reaches 46.4mPa.s, and being higher than the 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 the sewage salinity 12000mg/L left and right sides, the sewage that utilization contains poly-600 mg/L partly substitutes the clear water preparation polymers soln that to contain poly-amount be 5000mg/L, the pretreating agent that adds 160mg/L, again with low poly-(243mg/L) dilution of sewage mother liquor that contains, diluent concentration is 2200mg/L, and the best of investigating its clear water substitutes amount.When substituting clear water with the 70% sewage water that contains 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.When substituting clear water with the 80% sewage water that contains poly-600 mg/L, viscosity reaches 46.6 mPa.s, and being higher than the 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 efficient, employing contains poly-600 mg/L sewage and joins mother liquor again with gathering water-reducible polymers soln and carry out displacement test this containing, its injection allocation concentration is 1500mg/L, and the 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, is 60CP at 70 ℃ of lower viscositys of experimental temperature; 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 sees Table 1.Poly-driving improved recovery ratio 11.00%, contains polywater and drives recovery ratio 5.46%, and 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 joins mother liquor (5000mg/L) and contains polywater dilute polymer solution (1500mg/L) polymer flooding | 0.5 | 11.00 |
| Containing polywater drives | 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, use first clear water and polymer-bearing waste-water prepared polymer mother liquor, be mixed with polymer injection liquid with polymer mother liquor and polymer-bearing waste-water again; 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 the massfraction ratio, selects that to contain poly-concentration be that polymer-bearing waste-water 60-80 part and clear water 20-40 part of 200-1000mg/L mixes together at normal temperatures, again with sodium hydroxide 2-20 * 10
-3Part mixes together, and the molecular weight that adds at last 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 the massfraction ratio, selects that to contain poly-concentration be that the polymer-bearing waste-water 500-560 of 200-1000mg/L is mixed into polymer injection liquid with polymer mother liquor 400-440 part that to contain poly-concentration be 5000mg/L 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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|---|---|---|---|
| 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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| CN102925131A true CN102925131A (en) | 2013-02-13 |
| CN102925131B CN102925131B (en) | 2014-12-03 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105198187A (en) * | 2015-10-08 | 2015-12-30 | 中国海洋石油总公司 | Polymer-containing sludge dispersion and treatment method |
| CN111925782A (en) * | 2019-05-13 | 2020-11-13 | 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 |
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| 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 |
-
2012
- 2012-10-30 CN CN201210423667.3A patent/CN102925131B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 (1)
| Title |
|---|
| 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》, vol. 12, no. 19, 31 July 2012 (2012-07-31), pages 4766 - 4769111 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105198187A (en) * | 2015-10-08 | 2015-12-30 | 中国海洋石油总公司 | Polymer-containing sludge dispersion and treatment method |
| 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 |
| CN111925782A (en) * | 2019-05-13 | 2020-11-13 | 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 |
| 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 |
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| CN102925131B (en) | 2014-12-03 |
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