CN100389167C - Active alkali and its application in polynary chemical composite flooding - Google Patents
Active alkali and its application in polynary chemical composite flooding Download PDFInfo
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- CN100389167C CN100389167C CNB2006100161418A CN200610016141A CN100389167C CN 100389167 C CN100389167 C CN 100389167C CN B2006100161418 A CNB2006100161418 A CN B2006100161418A CN 200610016141 A CN200610016141 A CN 200610016141A CN 100389167 C CN100389167 C CN 100389167C
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Abstract
The present invention discloses one kind of active alkali with low cost and capacity of raising oil field recovery ratio and its application in polynary chemical composite flooding. The active alkali of the present invention consists of trisodium phosphate 45-55 wt%, sodium carbonate 40-50 wt%, and sodium dodecylbenzene sulfonate 2-15 wt%. The active alkali is applied in polynary chemical composite flooding to form polynary chemical composite flooding system with 17 % higher oil field recovery ratio compared with water flooding. The present invention has great emulsifying effect on raw oil in oil field and can solve the problem of scaling in the oil extracting process.
Description
Technical field
Invention relates to a kind of chemical combined flooding field of improving oil recovery rate, more particularly, relates to a kind of alkali/surfactant composition that is applied in the multiple elements chemical combination flooding.
Background technology
As far back as the sixties, external bibliographical information and the patent introduction that combination flooding has just been arranged.It relates generally to polymkeric substance/surfactant system, polymkeric substance/alkali (yellow soda ash) displacement system, polymkeric substance/tensio-active agent/alkali ternary system and drives, wherein polymkeric substance/alkali systems has been carried out a large amount of desk research, and carried out guiding test in the oil field, obtained certain effect.
China has also carried out a large amount of desk research and test in place aspect combination flooding, and has carried out test in place in grand celebration, triumph, Xinjiang, has improved certain oil-production efficiency.But still exist many problems in the alkali/dimerization composite displacement system that generally uses at present, for example inject the serious fouling of flow process pipeline, system viscosity instability, emulsifying effectiveness difference and to the problems such as destructiveness of oil reservoir, this directly influence alkali/poly-combination flooding and future the multiple elements chemical composite displacement system in oil reservoir, can effectively control mobility specific energy power, more can not effectively enlarge sweep efficiency, do not reach design requirements, restricted economic optimum simultaneously.
Summary of the invention
Technical problem to be solved by this invention is to overcome the deficiencies in the prior art, a kind of alkali/surfactant composition that is applied in the multiple elements chemical combination flooding that provide and can save cost, improves oil recovery rate.
A kind of alkali/surfactant composition that is applied in the multiple elements chemical combination flooding of the present invention, be achieved by following technical proposals, form by described weight percent: tertiary sodium phosphate 45～55%, yellow soda ash 40～50%, Sodium dodecylbenzene sulfonate 2～15% by following component.
Best proportioning of the present invention is: tertiary sodium phosphate 50%, yellow soda ash 47%, Sodium dodecylbenzene sulfonate 3%.
The present invention has following beneficial effect compared with prior art:
1) solved yellow soda ash can not effectively reduce oil water interfacial tension under oil well sewage condition problem, the present invention uses the preparation of oil well sewage, when lower concentration (0.2%), can reach 10
-3The ultra low interfacial tension that mN/m is following.
2) the composite back of the present invention and polymkeric substance forms composite displacement system, and compound system and crude oil have still produced 10
-3The ultra low interfacial tension of mN/m.
3) the present invention has very strong emulsifying effect to crude oil.
4) the present invention and polymkeric substance composite after, its Heat stability is good.
5) use active alkali of the present invention to solve the scale problems of technical process.
6) the present invention is applied to the multiple elements chemical combination flooding and forms multiple elements chemical combination flooding compound system under expanding test district reservoir condition, and the indoor physical simulation experimental result improves recovery ratio more than 17% than water drive.
Description of drawings
Fig. 1 is compound system INTERFACIAL TENSION CURVES figure;
Fig. 2 is the oil displacement efficiency graphic representation.
Embodiment
Below in conjunction with embodiment the present invention is described further.
Embodiment 1:
The present invention is made up of tertiary sodium phosphate 45kg, yellow soda ash 40kg, Sodium dodecylbenzene sulfonate 15kg.
Embodiment 2:
The present invention is made up of tertiary sodium phosphate 55kg, yellow soda ash 40kg, Sodium dodecylbenzene sulfonate 5kg.
Embodiment 3:
The present invention is made up of tertiary sodium phosphate 48kg, yellow soda ash 50kg, Sodium dodecylbenzene sulfonate 2kg.
Embodiment 4:
The present invention is made up of tertiary sodium phosphate 50kg, yellow soda ash 47kg, Sodium dodecylbenzene sulfonate 3kg.
In polynary combination flooding, should be used as detailed description to the present invention below:
One, the application in binary combination flooding
Binary combination flooding improves recovery efficiency technique to be made up of two core index, and the one, produce ultralow oil water interfacial tension, the 2nd, have system stability preferably, two indexs are indispensable.
Utilize the embodiment of the invention 2 (model NPS-1), embodiment 4 (model NPS-2), embodiment 3 (model NPS-3) oil in three fault block shops two, huge port sheep three wood oil fields the group study.
(1), interfacial tension experimental study
Organic acid generation saponification reaction in alkali and the crude oil generates tensio-active agent and then reduces oil water interfacial tension, improves the oil displacement efficiency of compound system.The reduction degree of its interfacial tension is the key factor of research active alkali, has determined whether binary combination flooding is feasible.Experiment is carried out under the three fault block expanding test district profit conditions of sheep three wood oil fields.
The present invention: model: NPS-1, NPS-2, NPS-3;
Oil sample: sheep 12-17 well crude oil;
Water sample: poly-station sewage is annotated in sheep three wood oil fields;
Experimental temperature: 63 ℃.
At late nineteen eighties, under the clear water condition, can make oil water interfacial tension be reduced to 10 with yellow soda ash
-2MN/m.
Under present sewage condition, with sheep three wooden sewage preparation sodium carbonate solutions, reach at 1.5% o'clock at concentration of sodium carbonate, still can not reduce oil water interfacial tension effectively, this compares with the result that the eighties experiment records and has a long way to go.
So under present sheep three wooden sewage conditions, the present invention (NPS-1, NPS-2, NPS-3) can reach ultra low interfacial tension when lower concentration (0.15%).
Yellow soda ash and the present invention and crude oil interfacial tension experimental data table one
At present sheep three wood oil field crude oil with inject under the sewage condition, can reach the type that ideal comparatively reduces the alkali of oil water interfacial tension and be the present invention, its performance that reduces oil water interfacial tension is far superior to yellow soda ash.
(2), emulsification experimental study
Can alkali be to estimate alkali improve one of important indicator of displacement efficiency to the emulsifying property of crude oil equally.Alkali and crude oil produce emulsifying effect, to produce in the oil reservoir hole that emulsification is carried, emulsification is carried secretly, emulsification is caught and, emulsification dispersion, milk sap tackify enlarge all mechanism of action (being called as microemulsion on the throne drives) of microemulsion floodings such as swept volume, can increase substantially recovery ratio.So the emulsifying property of alkali and crude oil is one of important indicator of evaluating combined flooding system feasibility equally.
1) experiment condition
Alkali: yellow soda ash, model: NPS-1, NPS-2, NPS-3;
Oil sample: sheep 12-17 well crude oil;
Water sample: poly-station sewage is annotated in sheep three wood oil fields;
Experimental temperature: 63 ℃.
Two kinds of alkali under equal conditions fluctuate respectively 20 times, observe description in static 30 minutes.
2) experimental result: table two.
Oil-water emulsion experimental data table table two
Annotate :-expression can not emulsification, and water-oil interface are clear; + expression can emulsification, and water-oil interface are more clear; ++ the expression emulsifying effectiveness is better, and water-oil interface are fuzzy; +++expression emulsify well, do not have water-oil interface substantially; ++ ++ expression profit complete miscibility forms micellar solution.
Can get experimental analysis:
1. emulsion shaking the initial stage later, can take place by 0.1% to 1.5% in sodium carbonate solution concentration, but the very fast disappearance of emulsion, the very fast layering of profit, the interface is high-visible, and emulsifying effectiveness is poor.
2. NPS-1, NPS-3 are under lower concentration 0.1%, 0.15%, 0.2% condition, and the profit layering is slightly obvious, and all miscible mutually from the above profit of 0.3% concentration, NPS-2 concentration is best by the mutually whole miscible effects of 0.2% to 1.5% profit.
To sum up analyze as seen, the present invention is far superior to yellow soda ash to the emulsifying property of sheep three wooden crude oil.
(3), quiet adsorptivity research
The binary combination flooding system will contact with rock forming mineral with the crude oil in the oil reservoir in oil displacement process, produces adsorption.If adsorptive capacity raises with the increase of alkali concn, migration and the displacement of reservoir oil of alkali in oil reservoir will be influenced.For this reason, carry out the quiet adsorption experiment of alkali with the oil-sand of trial plot, sheep three wood oil field zone of interest, with antalkaline absorption situation.
1) experiment condition
Alkali: NPS-2;
Oil-sand: sheep 10-36 well oil-sand;
Water sample: poly-station sewage is annotated in sheep three wood oil fields;
Experimental temperature: 63 ℃.
2) experimental result: see Table three.
From interpretation as seen, with the rising of alkali concn, adsorptive capacity of the present invention is downward trend.This experimental result helps the compound system displacement of reservoir oil and improves recovery ratio.
Adsorption experiment data sheet table three
| Alkali concn % | 0.2 | 0.4 | 0.6 | 0.8 | 1.0 | 1.2 | 1.5 |
| The alkali adsorptive capacity, ug/g | 1060 | 848 | 740 | 744 | 532 | 740 | 528 |
Two, the application of the present invention in the multiple elements chemical combination flooding
(1), compound system interfacial tension experimental study
Simple solution of the present invention and expanding test district crude oil can produce ultralow oil water interfacial tension, but with new polymers coupling after, whether still can reduce oil water interfacial tension, depend on whether two kinds of materials are complementary.
Compound system with sheep three wood oil field sewage preparation NPS-2/ polymkeric substance (any one polymkeric substance), polymer concentration 1500mg/L, the concentration of NPS-2 is 0.2～1.5%, under 63 ℃ of conditions, measure the interfacial tension of itself and sheep 12-17 well crude oil, experimental result is seen Fig. 1.
Interpretation:
Compound system that polymkeric substance and NPS-2 are composite and crude oil effect have produced certain influence to the compound system of mensuration and the interfacial tension of crude oil, have all produced ultra low interfacial tension, have reached below the 10-2mN/m, have satisfied the low interfacial tension requirement of combination flooding.
(2), the matching experimental study of alkali and polymkeric substance
In general, conventional polymkeric substance produces polymkeric substance 3630S as France, and contact with alkali after the coexistence can generation viscosity reduction phenomenon, thereby influences the compound system viscosifying action.For this reason, matching experiment, experimental result have been carried out with polymkeric substance and the present invention.
1) experiment condition
Polymkeric substance: oil well sewage polymkeric substance;
Alkali: (NPS-2);
Water sample: poly-station sewage is annotated in sheep three wood oil fields;
2) experimental result:
NPS-2 does not have the viscosity reduction effect to polymkeric substance, keeps original concentration viscosity number.
(3), composite displacement system THERMAL STABILITY
The oil displacement process of compound system will experience the time of some months or several years in oil reservoir, in very long oil displacement process, the thermostability of compound system is most important.The cycle of thermostability experiment was generally 3 months, within three months curve mild after, think that then system is stable.
1) experiment condition
Polymkeric substance; Alkali: NPS-2; Water: sheep three wood inject sewage; Experimental temperature: 63 ℃;
2) experiment condition and step: 1. prepared polymer solution, concentration 1500mg/L;
2. polymers soln adds alkali (concentration 0.6%), stablizer (0.03%) respectively;
3. do deoxygenation and not deoxygenation experiment respectively, put into viscosimetric record behind 63 ℃ of thermostat containers.
3) experimental result: see Table four.
Composite displacement system thermostability experiment table four
Analyze as seen from table four:
1. do not adding under the condition of stablizer, the stability of polymkeric substance is all relatively poor, and viscosity only is 5mPa.s..
2. under the condition that adds stablizer, the viscosity of polymer composite body system is 39.5mPa.s, has been in steady state.
3. for guaranteeing compound system stability, in polymkeric substance, must add stablizer, and sewage need be done the deoxygenation processing.
(4), the present invention and yellow soda ash fouling contrast experiment research
Serious scale formation has appearred in alkali/polymer flooding pilot test process.Scale effect normally carrying out of injecting of compound system ground, serious also can cause stratum fouling or oil well fouling.The conventional way that solves fouling is to add Scale inhibitors in system, but has increased the cost of system.Therefore, the alkali type of screening non-scaling just seems and is necessary very much.We carry out fouling experiment contrast in the laboratory with the present invention and yellow soda ash.
1) experiment condition
Alkali: yellow soda ash, NPS-2;
Water sample: poly-station sewage is annotated in sheep three wood oil fields;
Experimental temperature: normal temperature laboratory.
2) experimental result: see Table five.
Yellow soda ash and fouling experimental data table table five of the present invention
| Alkali concn % | 0.2 | 0.5 | 1.0 | 1.5 | 2.0 | 3.0 |
| Yellow soda ash fouling |
0 | 0.0065 | 0.0101 | 0.0072 | 0.0033 | 0.0095 |
| NPS-2 fouling weight g | / | / | / | / | / | / |
As can be seen from Table V:
1. the high more fouling of obvious fouling of yellow soda ash and concentration is serious more, and visual observations significantly white dirty matter occurs to the bottle end, need clean with hydrochloric acid.
2. the present invention does not have the fouling sign.
Three, the present invention is applied to the composite displacement system indoor physical simulation experimental study that the multiple elements chemical combination flooding forms
(1), combination flooding laboratory core oil displacement experiment research
1) experiment condition
Crude oil: sheep three wood oil fields three fault block expanding test district sheep 12-17 well crude oil;
Viscosity of crude: 530mPa.s;
Experimental temperature: 63 ℃;
Compound system: 0.6%NPS-2+1500mg/L A2 polymkeric substance, after compound system solution sheared with pulverizer, range of viscosities was about 45mPa.s, and the intermediate receptacle of packing into then is standby;
Experimental water: the sewage works sewage of sheep three wood oil fields three fault blocks, with 0.45 μ m filtering with microporous membrane;
Rock core: artificial inhomogeneous rock core, the rock core vertical heterogeneity is differential to be 1: 2: 4, average water phase permeability is
1.705～3.410 μ m
2, porosity is about 28.19%, the long 20.0cm of rock core;
Displacement flow velocity: 5 meters/day;
Displacement step: water drive 2PV, metaideophone → 0.6PV chemical flooding (0.5PV compound system+0.1PV alkali or polymkeric substance) → 2.4PV water drive finished experiment in moisture 98% o'clock, accumulative total injection pore volume 5PV.
2) experimental result:
Laboratory core drive physical analogue experimental data table table six
1. injection pressure curve result shows, alkali/surfactant composition/polymer composite body system is good with sheep three wooden sewage compatiblenesies, is 3.410 μ m in rate of permeation
2Condition under, can set up higher resistance coefficient and residual resistance factor.
2. table six and Fig. 2 show that from Fig. 2 oil displacement efficiency curve result it is 7.35% that pure water drives from 2PV～5PV recovery ratio improvement value; It is 13.71% that straight polymer drives from 2PV～5PV recovery ratio improvement value; Yellow soda ash/(polymkeric substance+the Na of polymer composite body system
2CO
3)/polymer flooding is 13.64% from 2PV～5PV recovery ratio improvement value; Active alkali/polymer composite body system (polymkeric substance+NPS)/polymkeric substance] to drive from 2PV～5PV recovery ratio improvement value be 24.69%.Show that alkali/surfactant composition compound system has the effect of stronger raising recovery ratio to sheep three wooden expanding test districts.
3. yellow soda ash and polymkeric substance composite after because oil water interfacial tension can not effectively reduce, only be 3～5mN/m, so basic identical with the raising recovery ratio amplitude that straight polymer drives, alkali does not play a role.
4. alkali/surfactant composition/polymkeric substance composite oil-displacing system is because stronger effect of reduction oil water interfacial tension and viscosifying action is 530mPa.s at viscosity of crude, and core permeability is 3 μ m
2Under the condition, comparable water drive improves recovery ratio about 17%, is suitable for alkali polymer flooding expanding test district, sheep three wood oil field and improves recovery ratio.
Claims (2)
1. an alkali/surfactant composition that is applied in the multiple elements chemical combination flooding is characterized in that, is made up of by described weight percent following component: tertiary sodium phosphate 45～55%, yellow soda ash 40～50%, Sodium dodecylbenzene sulfonate 2～15%.
2. a kind of alkali/surfactant composition that is applied in the multiple elements chemical combination flooding according to claim 1 is characterized in that, is made up of by described weight percent following component: tertiary sodium phosphate 50%, yellow soda ash 47%, Sodium dodecylbenzene sulfonate 3%.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2109132C1 (en) * | 1996-06-27 | 1998-04-20 | Закрытое акционерное общество "Тюмень-Технология" | Method for increasing oil recovery from beds |
| CN1272587A (en) * | 1999-04-30 | 2000-11-08 | 大庆石油管理局 | Three-component composite displacement system formed from alkali, active agent and polymer and its application in tertiary oil recovery |
| CN1281025A (en) * | 2000-08-07 | 2001-01-24 | 大庆油田有限责任公司勘探开发研究院 | Three-element built-up composition containing alkylphenylsulfonate surfactant and its application |
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- 2006-10-13 CN CNB2006100161418A patent/CN100389167C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2109132C1 (en) * | 1996-06-27 | 1998-04-20 | Закрытое акционерное общество "Тюмень-Технология" | Method for increasing oil recovery from beds |
| CN1272587A (en) * | 1999-04-30 | 2000-11-08 | 大庆石油管理局 | Three-component composite displacement system formed from alkali, active agent and polymer and its application in tertiary oil recovery |
| CN1281025A (en) * | 2000-08-07 | 2001-01-24 | 大庆油田有限责任公司勘探开发研究院 | Three-element built-up composition containing alkylphenylsulfonate surfactant and its application |
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