CN102382634A - Composite viscosity stabilizing agent for polymer flooding - Google Patents
Composite viscosity stabilizing agent for polymer flooding Download PDFInfo
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- CN102382634A CN102382634A CN2011102582520A CN201110258252A CN102382634A CN 102382634 A CN102382634 A CN 102382634A CN 2011102582520 A CN2011102582520 A CN 2011102582520A CN 201110258252 A CN201110258252 A CN 201110258252A CN 102382634 A CN102382634 A CN 102382634A
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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 stablizer, be specifically related to a kind of compound viscosity stabiliser that is used for polymer flooding.
Background technology
Compound viscosity stabiliser is applied to the technique of polymer flooding in the TOR field.At present; The problem that technique of polymer flooding exists is: in the prepared polymer solution process; Polymer mother liquor is no matter be the still polymers soln that dilutes of clear water of dilution of sewage (anaerobism sewage, oxygen sewage exposes to the sun); The problem that all has viscosity permanent stability difference, especially stability of viscidity is very poor in anaerobism sewage; In ground, stratum in the migration process, the reduction significantly of polymers soln viscosity has a strong impact on the effect of polymer technology.
Summary of the invention
In order to improve polymers soln viscosity long term stability problem, technical problem to be solved by this invention provides a kind of can stablizing with certain amplitude and improves the viscosity of polymers soln, the compound viscosity stabiliser of raising polymer flooding effect of field application.
For solving the problems of the technologies described above; The technical scheme that the present invention taked be this stablizer by N-o-tolyl thiocarbamide and gallic acid by weight ratio be 5～1 to be made into the aqueous solution; Form a kind of compound viscosity stabiliser, the application concentration of stablizer in polymers soln is 30～300mg/L.
A kind of mechanism of action that is used for the compound viscosity stabiliser of polymer flooding of the present invention:
(1) passes through hydrogen bond, Van der Waals force between .N-o-tolyl thiocarbamide and the polymkeric substance; And can produce certain chemical action between the polymkeric substance; The ability that makes polymkeric substance carry water molecules increases, polymer molecular size increases, and the viscosity of polymers soln does not only descend, has on the contrary the rising of certain amplitude.
(2) .N-o-tolyl thiocarbamide has the oxygen consumption effect, and anti-block makes the viscosity of polymers soln stable to the Degradation of polymkeric substance.
(3). gallic acid can stop the radical that different reasons (high temperature, illumination, redox reaction) produce, and prevents the polymer molecule splitting of chain, makes the viscosity of polymers soln stable.
(4). gallic acid has certain effect of killing sulphate reducing bacteria, prevents the degraded of sulphate reducing bacteria to polymkeric substance.
A kind of beneficial effect that compound viscosity stabiliser produced that is used for polymer flooding of the present invention is:
(1). have multiple stable mechanism, can stablize viscosity with the raising polymers soln of certain amplitude.
(2). be fit to the polymers soln of clear water, the oxygen sewage that exposes to the sun, the preparation of anaerobism sewage, it is wide to be suitable for the water quality scope.
(3). (30～300mg/L), it is wide to be suitable for concentration range to have confirmed the working concentration of stablizer.
(4). the stablizer adding technology is simple, and product is delivered to the scene with the form of the aqueous solution, and is easy to operate.
(5). the stablizer environmentally safe, do not have injury to human body.
Embodiment
Embodiment 1
The compound viscosity stabiliser that the present invention is used for polymer flooding by N-o-tolyl thiocarbamide and gallic acid by weight ratio be 5 to be made into the aqueous solution, form a kind of compound viscosity stabiliser, the application concentration of stablizer in polymers soln is 300mg/L.
Embodiment 2
The compound viscosity stabiliser that the present invention is used for polymer flooding by N-o-tolyl thiocarbamide and gallic acid by weight ratio be 4 to be made into the aqueous solution, form a kind of compound viscosity stabiliser, the application concentration of stablizer in polymers soln is 150mg/L.
Embodiment 3
The compound viscosity stabiliser that the present invention is used for polymer flooding by N-o-tolyl thiocarbamide and gallic acid by weight ratio be 3 to be made into the aqueous solution, form a kind of compound viscosity stabiliser, the application concentration of stablizer in polymers soln is 30mg/L.
Embodiment 4
The compound viscosity stabiliser that the present invention is used for polymer flooding by N-o-tolyl thiocarbamide and gallic acid by weight ratio be 2 to be made into the aqueous solution, form a kind of compound viscosity stabiliser, the application concentration of stablizer in polymers soln is 100mg/L.
Embodiment 5
The compound viscosity stabiliser that the present invention is used for polymer flooding by N-o-tolyl thiocarbamide and gallic acid by weight ratio be 1 to be made into the aqueous solution, form a kind of compound viscosity stabiliser, the application concentration of stablizer in polymers soln is 200mg/L.
Above-described embodiment describes preferred implementation of the present invention; Be not that scope of the present invention is limited; Design under the prerequisite of spirit not breaking away from the present invention; Various distortion and improvement that those of ordinary skills have done technical scheme of the present invention all should fall within protection scope of the present invention.
One, the present invention is used for the compound viscosity stabiliser The laboratory results of polymer flooding:
1, under fresh sewage (oxygen barrier) condition, add the polymers soln that the finite concentration stablizer makes aging 90 days, never add stablizer 8.2～9.5 mPa.s, rise to 29.0～48.8mPa.s, see table 1.
The fresh sewage preparation of table 1 various polymerization substrate concentration permanent stability (mPa.s)
2, expose to the sun under oxygen sewage (ageing) condition, add the polymers soln that the finite concentration stablizer makes aging 90 days, never add stablizer 11.2～20.5 mPa.s, rise to 30.6～46.8mPa.s, see table 2.
3, in identical digestion time, under the identical condition of water quality, the polymers soln that adds stablizer does not add the sample of stablizer, and the amplitude that improves RF is big, and oil displacement efficiency is good; The polymers soln RF raising value of the interpolation stablizer of dilution of sewage is 14.75% during as aging 60 days, and (5.48%) does not exceed 8.27 percentage points when adding stablizer.
The table 2 oxygen sewage preparation various polymerization substrate concentration permanent stability (mPa.s) of exposing to the sun
Core physical simulation oil displacement experiment result sees table 3.
Table 3 core physical simulation oil displacement experiment result
Two, the present invention is used for the compound viscosity stabiliser rig-site utilization instance of polymer flooding.
With the recover the oil example that is applied as of two factories of Daqing oil field.
Stablizer on May 4th, 2006 began to be applied in the I 1-4 of the Portugal oil reservoir of oil recovery east, two factory Nan San districts, and 50 mouthfuls of total injection-production wells wherein inject Jing21Kou, extraction Jing29Kou.Stablizer is delivered to the scene with the form of the aqueous solution, mixes the back with polymers soln and injects oil reservoir, makes the viscosity of polymers soln stabilization of polymer solution in the oil reservoir flow event.
Rig-site utilization result:
1, the well head viscosity improves, and injection pressure rises, and apparent water injectivity index descends.
The total Jing21Kou that injects in test site adds stablizer well head viscosity and brings up to 34.2mPa.s by 10.6 mPa.s, has increased more than the 20mPa.s, gathers the station contrast with other notes that do not add stablizer, injects the high 19.4-22.2mPa.s of viscosity.The average injection pressure of injection pressure rises to 10.93MPa by 10.52MPa; Trigger pressure rises to 10.43MPa by 10.23MPa, rising 0.2MPa.It is stable that diurnal injection keeps, apparent water injectivity index 0.07 m3/m.MPa that descends.
2, the oil reservoir resistance increases, and the PI value rises.
18 mouthfuls of well PI values that statistical study is tested rise to 14.63MPa by the 13.84MPa before the test, and rising 0.79MPa explains that injecting viscosity raises, and causes the increase of oil reservoir resistance to influence.
3, input profile improves.
Successively 2 mouthfuls of general wells that inject are carried out the input profile test; The analysis contrast is injected well south 3-1-P33 and is injected stablizer front and back intake profile; Wherein the suction ratio of the I 2a of high permeability formation Portugal, the I 2b of Portugal substratum drops to 60.67% and 22.42% by 71.19% and 26.55% respectively; Descend 10.52 and 4.13 percentage points, improve interlayer contradiction effectively, improve oil reservoir suction situation.
4, daily output oil in wellblock, center rises, and water cut decreases, development effectiveness are better than does not annotate the stablizer wellblock.
The test site has 9 mouthfuls of center extraction wells, day production fluid 1457t after the interpolation stablizer takes effect, and day produce oil 76.8t, comprehensive water cut 94.7% is adopted and is gathered concentration 603.0mg/L; With contrast before the test, day produce oil rising 8.1t, 0.4 percentage point of water cut decreases; The liquid of wellblock, center daily output at present 1371t, day produce oil 74.8t, comprehensive water cut 94.5%.No. 5 injection stations of stablizer are not annotated in contrast, wellblock, center 9 mouthfuls of extraction wells day in September, 2006 production fluid 1110t, day produce oil 53.3t; Comprehensive water cut 95.2% is adopted and is gathered concentration 553.0mg/L, contrasts with April; Oily 0.8t falls in day; Comprehensive water cut rises 0.4 percentage point, so the test site development effectiveness is better than and do not annotate the stablizer wellblock, sees table 4.
Wellblock, center, table 4 test site production data cartogram
5, add stablizer and can save the polymer dry powder consumption.
Add stablizer and can effectively practice thrift polymer dry powder.1200mg/L polymkeric substance+stablizer is higher than 1400mg/L polymers soln initial viscosity, stablize 15 days after, the high 24.1mPa.s of viscosity is than high 3.4 mPa.s of 1400mg/L polymers soln initial viscosity.Stablizer is added in comparative analysis can save polymer dry powder 300mg/L, and deduction stablizer expense can be practiced thrift about 200mg/L remarkable in economical benefits.
Daqing oil field two factories of recovering the oil use one package stabilizer of the present invention first, have solved the problem that the polymer solution made up by sewage viscosity descends significantly.
Can know that through above desk research and rig-site utilization the present invention is applied to technique of polymer flooding, can stablize viscosity with the raising polymers soln of certain amplitude.Can produce certain chemical action between N-o-tolyl thiocarbamide and the polymkeric substance, with oxygen stronger response capacity arranged, anti-block is to the Degradation of polymkeric substance.Gallic acid has the function that stops radical, can prevent the degraded of sulphate reducing bacteria to polymkeric substance simultaneously.Multiple stable mechanism comprehensive action makes compound viscosity stabiliser have the ability of efficient stable polymers soln viscosity; Adding the finite concentration stablizer can make well head polymers soln viscosity improve; Injection pressure rises; Input profile improves, and can save the polymer dry powder consumption, improves on-the-spot oil increasing effect and reaches the purpose that improves RF.
Claims (1)
1. compound viscosity stabiliser that is used for polymer flooding; It is characterized in that by N-o-tolyl thiocarbamide and gallic acid by weight ratio be 5～1 to be made into the aqueous solution; Form a kind of compound viscosity stabiliser, the application concentration of stablizer in polymers soln is 30～300mg/L.
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| Application Number | Priority Date | Filing Date | Title |
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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 true CN102382634A (en) | 2012-03-21 |
| CN102382634B CN102382634B (en) | 2013-09-04 |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010133258A1 (en) * | 2009-05-18 | 2010-11-25 | Snf Sas | Novel formulations of water-soluble polymers and stabilizing additives for injecting a single compound useable in injection fluids for chemical enhanced oil recovery |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010133258A1 (en) * | 2009-05-18 | 2010-11-25 | Snf Sas | Novel formulations of water-soluble polymers and stabilizing additives for injecting a single compound useable in injection fluids for chemical enhanced oil recovery |
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