CN102382634B - Composite viscosity stabilizing agent for polymer flooding - Google Patents
Composite viscosity stabilizing agent for polymer flooding Download PDFInfo
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- CN102382634B CN102382634B CN 201110258252 CN201110258252A CN102382634B CN 102382634 B CN102382634 B CN 102382634B CN 201110258252 CN201110258252 CN 201110258252 CN 201110258252 A CN201110258252 A CN 201110258252A CN 102382634 B CN102382634 B CN 102382634B
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Abstract
The invention provides a composite viscosity stabilizing agent for polymer flooding, which is characterized by being formed by aqueous solution prepared by N-ortho tolyl thiourea and gallic acid, wherein the weigh ratio of the N-ortho tolyl thiourea and the gallic acid is 5:1. Reaction concentration of the stabilizing agent in the polymer solution is 30-300 mg/L. The composite viscosity stabilizing agent for the polymer flooding is pollution-free to the environment, harm-free to the human body, wide in application range of water quality and the application range of the concentration and simple and convenient to manufacture.
Description
Technical field
The present invention relates to stabilizer, and in particular to a kind of compound viscosity stabiliser for polymer flooding.
Background technology
Compound viscosity stabiliser is applied to the technique of polymer flooding in tertiary oil recovery field.At present, the problem of technique of polymer flooding is present be：During prepared polymer solution, polymer mother liquor either dilution of sewage（Anaerobism sewage, exposure oxygen sewage）Or, all there is the problem of viscosity long-time stability are poor, especially stability of viscidity is very poor in anaerobism sewage in clear water-reducible polymer solution；In ground, stratum in migration process, being greatly lowered for Polymer Solution Viscosity has a strong impact on the application effect of polymer technology.
The content of the invention
In order to improve Polymer Solution Viscosity long term stability problem, the technical problems to be solved by the invention are to provide a kind of viscosity that can stably with certain amplitude raising polymer solution, improve the compound viscosity stabiliser of polymer flooding effect of field application.
To solve above-mentioned technical problem, the technical solution used in the present invention is that the stabilizer is made into the aqueous solution by N- o-tolyls thiocarbamide and gallic acid ratio by weight for 5~1, a kind of compound viscosity stabiliser is formed, the application concentration of stabilizer in a polymer solution is 30~300mg/L.
A kind of mechanism of action of compound viscosity stabiliser for polymer flooding of the invention：
（1）.N- hydrogen bond, Van der Waals force are passed through between o-tolyl thiocarbamide and polymer, certain chemical action can be produced between polymer, polymer is set to carry the ability increase of hydrone, polymer molecular size increase, the viscosity of polymer solution do not decline not only, have the rising of certain amplitude on the contrary.
（2）.N- o-tolyl thiocarbamide has oxygen consumption effect, and anti-block makes the viscosity stablization of polymer solution to the degradation of polymer.
（3）Gallic acid can terminate different reasons（High temperature, illumination, redox reaction）The free radical of generation, prevents breaking polymer chains, makes the viscosity stablization of polymer solution.
（4）Gallic acid has certain effect for killing sulfate reducing bacteria, prevents degraded of the sulfate reducing bacteria to polymer.
Beneficial effect produced by a kind of compound viscosity stabiliser for polymer flooding of the invention is：
（1）Have plurality of stable mechanism, can stablize and certain amplitude improve polymer solution viscosity.
（2）It is adapted to clear water, exposes oxygen sewage, the polymer solution of anaerobism waste water, is applicable water quality scope wide.
（3）The concentration of stabilizer is determined（30~300mg/L）, it is applicable concentration range wide.
（4）Stabilizer adding technology is simple, and product is sent to scene in form of an aqueous solutions, easy to operate.
（5）Stabilizer is environmentally safe, to human body fanout free region.
Embodiment
Embodiment 1
The compound viscosity stabiliser that the present invention is used for polymer flooding is made into the aqueous solution by N- o-tolyls thiocarbamide and gallic acid ratio by weight for 5, forms a kind of compound viscosity stabiliser, and the application concentration of stabilizer in a polymer solution is 300mg/L.
Embodiment 2
The compound viscosity stabiliser that the present invention is used for polymer flooding is made into the aqueous solution by N- o-tolyls thiocarbamide and gallic acid ratio by weight for 4, forms a kind of compound viscosity stabiliser, and the application concentration of stabilizer in a polymer solution is 150mg/L.
Embodiment 3
The compound viscosity stabiliser that the present invention is used for polymer flooding is made into the aqueous solution by N- o-tolyls thiocarbamide and gallic acid ratio by weight for 3, forms a kind of compound viscosity stabiliser, and the application concentration of stabilizer in a polymer solution is 30mg/L.
Embodiment 4
The compound viscosity stabiliser that the present invention is used for polymer flooding is made into the aqueous solution by N- o-tolyls thiocarbamide and gallic acid ratio by weight for 2, forms a kind of compound viscosity stabiliser, and the application concentration of stabilizer in a polymer solution is 100mg/L.
Embodiment 5
The compound viscosity stabiliser that the present invention is used for polymer flooding is made into the aqueous solution by N- o-tolyls thiocarbamide and gallic acid ratio by weight for 1, forms a kind of compound viscosity stabiliser, and the application concentration of stabilizer in a polymer solution is 200mg/L.
Embodiment described above is only that the preferred embodiment of the present invention is described; not the scope of the present invention is limited; on the premise of design spirit of the present invention is not departed from; various modifications and improvement of the those of ordinary skill in the art to made by technical scheme, should fall under the scope of the present invention.
First, the present invention is used for the compound viscosity stabiliser the laboratory results of polymer flooding：
1st, fresh sewage（Oxygen barrier）Under the conditions of, addition finite concentration stabilizer makes the polymer solution of aging 90 days, from being not added with 8.2~9.5 mPa.s of stabilizer, rising to 29.0~48.8mPa.s, is shown in Table 1.
The fresh sewage of table 1 prepares different polymer concentration long-time stability（mPa.s）
2nd, oxygen sewage is exposed（Ageing）Under the conditions of, addition finite concentration stabilizer makes the polymer solution of aging 90 days, from being not added with 11.2~20.5 mPa.s of stabilizer, rising to 30.6~46.8mPa.s, is shown in Table 2.
3rd, under identical ageing time, identical condition of water quality, the polymer solution for adding stabilizer does not add the sample of stabilizer, and the amplitude for improving recovery ratio is big, and oil displacement efficiency is good；The polymer solution recovery ratio raising value of the addition stabilizer of dilution of sewage during such as aging 60 days is 14.75%, when being relatively not added with stabilizer（5.48%）It is higher by 8.27 percentage points.
Table 2 exposes the different polymer concentration long-time stability of oxygen waste water（mPa.s）
Core physical contradictions the results are shown in Table 3.
The core physical contradictions result of table 3
2nd, compound viscosity stabiliser live application example of the present invention for polymer flooding.
By taking the application of two factories of Daqing oil field oil recovery as an example.
Stabilizer on May 4th, 2006 starts to apply in the 1-4 oil reservoirs of Portugal I of the area east of two Chang Nan tri- that recover the oil, and has 50 mouthfuls of injection-production well, wherein 21 mouthfuls of injection well, produces Jing29Kou.Stabilizer is sent to scene in form of an aqueous solutions, and oil reservoir is injected after being mixed with polymer solution, makes the viscosity of polymer solution stable polymer solution in oil reservoir flow event.
Apply result in scene：
1st, well head viscosity is improved, and injection pressure rises, and apparent water injectivity index declines.
Trial zone has 21 mouthfuls of injection well, and addition stabilizer well head viscosity brings up to 34.2mPa.s by 10.6 mPa.s, adds more than 20mPa.s, is contrasted with other poly- stations of note for not adding stabilizer, the high 19.4-22.2mPa.s of injection viscosity.Injection pressure averagely injects pressure and rises to 10.93MPa by 10.52MPa;Start pressure and 10.43MPa is risen to by 10.23MPa, rise 0.2MPa.Diurnal injection keeps stable, and apparent water injectivity index declines 0.07 m3/m.MPa.
2nd, oil reservoir resistance increase, PI values rise.
18 mouthfuls of well PI values of statistical analysis test, by testing before 13.84MPa rise to 14.63MPa, rise 0.79MPa, illustrate that injection viscosity is raised, causing oil reservoir resistance to increase is influenceed.
3rd, injection profile is improved.
Injection profile test successively is carried out to 2 mouthfuls of general injection wells, intake profile before and after analysis contrast injection well south 3-1-P33 injection stabilizers, the wherein 2a of high permeability formation Portugal I, the water suction ratio of the 2b substratums of Portugal I drop to 60.67% and 22.42% by 71.19% and 26.55% respectively, decline 10.52 and 4.13 percentage points, effectively improve interlayer contradiction, improve oil reservoir water swelling elastomer.
4th, daily output oil in center wellblock rises, and comprehensive water cut declines, and development effectiveness, which is better than, do not note stabilizer wellblock.
Trial zone has 9 mouthfuls of center extraction wells, and addition stabilizer produces liquid 1457t daily after taking effect, and day oil-producing 76.8t, comprehensive water cut 94.7% adopts poly- concentration 603.0mg/L；With being contrasted before experiment, day oil-producing rising 8.1t, comprehensive water cut declines 0.4 percentage point；Current center wellblock daily output liquid 1371t, day oil-producing 74.8t, comprehensive water cut 94.5%.No. 5 injection stations of stabilizer are not noted in contrast, 9 mouthfuls of center wellblock extraction well in September, 2006 part daily output liquid 1110t, day oil-producing 53.3t, comprehensive water cut 95.2%, adopts poly- concentration 553.0mg/L, is contrasted with April, day drop oil 0.8t, comprehensive water cut rises 0.4 percentage point, therefore trial zone development effectiveness is better than and do not note stabilizer wellblock, is shown in Table 4.
The trial zone center wellblock creation data statistical form of table 4
5th, addition stabilizer can save polymer dry powder consumption.
Adding stabilizer can be with effectively save polymer dry powder.1200mg/L polymer+stabilizer is higher than 1400mg/L polymer solution initial viscosities, stablizes after 15 days, the high 24.1mPa.s of viscosity, 3.4 mPa.s higher than 1400mg/L polymer solution initial viscosities.Comparative analysis addition stabilizer can save polymer dry powder 300mg/L, deduct stabilizer expense, can save 200mg/L or so, remarkable in economical benefits.
Daqing oil field recovers the oil two factories first using compound stabilizer of the present invention, solves the problem of polymer solution made up by sewage viscosity significantly declines.
By above desk research and scene apply, the present invention be applied to technique of polymer flooding, can stablize and certain amplitude improve polymer solution viscosity.Certain chemical action can be produced between N- o-tolyls thiocarbamide and polymer, has stronger respond, degradation of the anti-block to polymer with oxygen.Gallic acid has the function of terminating free radical, while degraded of the sulfate reducing bacteria to polymer can be prevented.Plurality of stable mechanism comprehensive function makes the ability that compound viscosity stabiliser has efficient stable Polymer Solution Viscosity, addition finite concentration stabilizer can improve well head polymer solution viscosity, pressure is injected to rise, injection profile improves, polymer dry powder consumption can be saved, live oil increasing effect is improved and reaches the purpose for improving recovery ratio.
Claims (1)
1. a kind of compound viscosity stabiliser for polymer flooding, it is characterized in that being made into the aqueous solution by N- o-tolyls thiocarbamide and gallic acid ratio by weight for 5~1, a kind of compound viscosity stabiliser is formed, the application concentration of stabilizer in a polymer solution is 30~300mg/L.
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| CN 201110258252 CN102382634B (en) | 2011-09-02 | 2011-09-02 | Composite viscosity stabilizing agent for polymer flooding |
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| CN 201110258252 CN102382634B (en) | 2011-09-02 | 2011-09-02 | Composite viscosity stabilizing agent for polymer flooding |
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| CN102382634A CN102382634A (en) | 2012-03-21 |
| CN102382634B true CN102382634B (en) | 2013-09-04 |
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