CN104693349A - Synthesis method of novel surface-active oil displacement polymer - Google Patents
Synthesis method of novel surface-active oil displacement polymer Download PDFInfo
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- CN104693349A CN104693349A CN201310646255.0A CN201310646255A CN104693349A CN 104693349 A CN104693349 A CN 104693349A CN 201310646255 A CN201310646255 A CN 201310646255A CN 104693349 A CN104693349 A CN 104693349A
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Abstract
The invention relates to a synthesis method of a novel surface-active oil displacement polymer. The novel surface-active salt-resistant polymer is synthesized through introducing a proper amount of hydrophobic lipophilic group to a present salt resistant polymer which is used as a main body in order to make an oil displacement agent have good salt resistant viscosifying capability and certain surface activity, so the oil/water fluidity ratio is improved, thereby the injected liquid swept volume is enlarged; and the petroleum recovery rate is improved by means of the emulsification function of the surface active group. The polymer comprises 25-55% of acrylamide, 0.5-2.5% of hydrophilic monomer, 0.75-2.5% of AS, 0.02-0.08% of sodium carbonate, 0.01-0.5% of sodium formate, 15-30% of deionized water and 0.08-1.8% of potassium persulfate. The viscosity of the polymer provided by the invention is about 1.5 times the viscosity of an HPAM solution with a same concentration, so the displacement liquid swept zone is enlarged, and the salt resistance is good.
Description
Technical field
The present invention relates to the study on the synthesis of the active flooding polymers of a kind of novel surface, belong to field of oilfield chemistry.
Background of invention
Polymer flooding is the raising petroleum recovery technology of China's present stage Application comparison maturation technically and economically, has become the main force of Daqing oil EOR, for ensureing that outstanding contributions have been made in Daqing oil field high and stable yields.But, also find that polymer flooding exists following major drawbacks at the scene in production process: 1. with clear water or salinity lower water preparation polymers soln injection stratum after run into the very high local water of salinity, the diffusion double layer of anionic polymer molecule is compressed, the hydrodynamic radius of polymer molecule diminishes, internal friction declines between molecule, finally causes the apparent viscosity of solution reduce thus affect ultimate recovery factor; Though 2. polymer flooding can improve the sweep efficiency of displacing fluid significantly, it is little for the increase rate of displacement efficiency that its oil-displacement mechanism determines polymer flooding, this just make postpolymer flood still have an appointment 50% crude oil do not employed on stratum.
The present invention is in conjunction with the problems referred to above, based on existing anti-salt type polymkeric substance, by the hydrophobic oleophilic oil group inducing one appropriate, synthesize and a kind ofly novel there is surface-active salt-resistant type polymkeric substance, thus make the existing anti-salt increasing stickiness well of oil-displacing agent have again certain surfactivity, and then realize both having expanded note people liquid swept volume by improving oil and water mobility ratio, again by surface active groups emulsification function and improve the object of oil recovery.
Summary of the invention
The present invention relates to the study on the synthesis of the active flooding polymers of a kind of novel surface, it is characterized in that:
Above-mentioned raw materials is preferably from the polyacrylamide of acrylamide, sodium bisulfite, Potassium Persulphate, salt of wormwood, sodium-chlor, sodium formiate, hydrophobically modified.
In system, the ratio of each component is: acrylamide 25 ~ 55%, hydrophilic monomer 0.5 ~ 2.5%, AS0.75 ~ 2.5%, sodium carbonate 0.02 ~ 0.08%, sodium formiate 0.01 ~ 0.5%, deionized water 15 ~ 30%, Potassium Persulphate: 0.08 ~ 1.8%.
Concrete preparation method: add a certain amount of acrylamide, hydrophilic monomer (containing sulfonic group, amide group etc.), oleophylic monomer (code name AS in three-necked flask, laboratory is made by oneself, containing chain alkyl, amide group, ester group etc.), sodium carbonate, sodium formiate and deionized water etc., heat up, logical nitrogen deoxidation 20min, add low temperature composite initiation system auxiliary agent, after 10min, add a certain amount of redox initiator sodium bisulfite/Potassium Persulphate; Confined reaction after the logical nitrogen 10min of continuation again, reaction about 8 ~ 15h, after question response completes, the temperature of water-bath rises to 80 ~ 150 DEG C, and keeps 4 ~ 12h.By the blob of viscose granulation of synthesis, just can obtain for dry, pulverizing the polymkeric substance that patent of the present invention relates to.
Accompanying drawing explanation
Fig. 1 at temperature 45 C, salinity 2400mg/L, shearing rate 7.34s
-1condition under, the polymkeric substance that patent of the present invention relates to and supra polymer HPAM, viscosity in simulation mineralized water is with the change of concentration, as can be seen from Figure 1, in trial stretch, the viscosity of two kinds of polymers solns all rises with the increase of concentration, when concentration is lower than 600mg/L, the two is more or less the same, and when concentration continues to increase time, the polymkeric substance viscosity that patent of the present invention relates to obviously is greater than HPAM, at the working concentration of Oil Field polymkeric substance generally higher than 600mg/L, therefore the polymkeric substance that patent of the present invention relates to has better properties than the HPAM of ultra-high molecular weight.
Fig. 2 is under these conditions, the different polymkeric substance of sodium chloride concentration preparation and the viscosity of HPAM solution, as seen from Figure 2, the viscosity of two kinds of polymers solns all declines with the increase of sodium chloride concentration, and particularly when sodium chloride concentration is lower, solution viscosity sharply declines, when sodium chloride concentration continues to increase, change tends towards stability, also find, under the same conditions, the Polymer Solution Viscosity that patent of the present invention relates to all is greater than HPAM solution simultaneously.The salt resistance that visible patent of the present invention relates to polymkeric substance is greatly improved compared to HPAM
Embodiment
Below in conjunction with embodiment, the present invention will be further described, but be not limited only to this.
Embodiment 1:
In system, the ratio of each component is: acrylamide 30%, hydrophilic monomer 0.8%, AS1.5%, sodium carbonate 0.06%, sodium formiate 1.5%, deionized water 18%, Potassium Persulphate: 1.0%.
Concrete preparation method: add a certain amount of acrylamide, hydrophilic monomer (containing sulfonic group, amide group etc.), oleophylic monomer (code name AS in three-necked flask; laboratory is made by oneself; containing chain alkyl, amide group, ester group etc.), sodium carbonate, sodium formiate and deionized water etc.; heat up; logical nitrogen deoxidation 20min; add low temperature composite initiation system auxiliary agent, after 10min, add a certain amount of redox initiator sodium bisulfite/Potassium Persulphate; Confined reaction after the logical nitrogen 10min of continuation again, react about 10h, after question response completes, the temperature of water-bath rises to 85 DEG C, and keeps 10h.By the blob of viscose granulation of synthesis, just can obtain for dry, pulverizing the polymkeric substance that patent of the present invention relates to.
Embodiment 2: acrylamide 45%, hydrophilic monomer 1.6%, AS1.08%, sodium carbonate 0.06%, sodium formiate 0.15%, deionized water 20%, Potassium Persulphate: 1.5%.
Concrete preparation method is with embodiment 1.
Embodiment 3: acrylamide 30%, hydrophilic monomer 2.0%, AS1.5%, sodium carbonate 0.04%, sodium formiate 0.3%, deionized water 20%, Potassium Persulphate: 1.2%
Concrete preparation method is with embodiment 1.
Claims (3)
1. the present invention relates to the study on the synthesis of the active flooding polymers of a kind of novel surface, it is characterized in that: above-mentioned raw materials is preferably from the polyacrylamide of acrylamide, sodium bisulfite, Potassium Persulphate, salt of wormwood, sodium-chlor, sodium formiate, hydrophobically modified.
2. as the study on the synthesis of above-mentioned a kind of novel surfactant flooding polymers according to claim 1, in system, the ratio of each component is: acrylamide 25 ~ 55%, hydrophilic monomer 0.5 ~ 2.5%, AS 0.75 ~ 2.5%, sodium carbonate 0.02 ~ 0.08%, sodium formiate 0.01 ~ 0.5%, deionized water 15 ~ 30%, Potassium Persulphate: 0.08 ~ 1.8%.
3. as the study on the synthesis of above-mentioned a kind of novel surfactant flooding polymers according to claim 1, the first step reaction times is 8 ~ 15h, and second keeps elementary reaction temperature to be 80 ~ 150 DEG C, and the reaction times is 4 ~ 12h.
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| CN201310646255.0A CN104693349A (en) | 2013-12-04 | 2013-12-04 | Synthesis method of novel surface-active oil displacement polymer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110079291A (en) * | 2019-05-31 | 2019-08-02 | 西南石油大学 | Emulsify increasing stick system in situ containing high transformation temperature and in the application of water-drive pool |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110079291A (en) * | 2019-05-31 | 2019-08-02 | 西南石油大学 | Emulsify increasing stick system in situ containing high transformation temperature and in the application of water-drive pool |
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Application publication date: 20150610 |