CN105257264A - Method for improving carbon dioxide displacement yield by using surfactants - Google Patents
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Abstract
The invention discloses a method for improving the carbon dioxide displacement yield by using surfactants. The method comprises the following steps of: uniformly mixing selected surfactants and supercritical carbon dioxide according to a mass ratio being (0.00061:1) to (0.00338:1) under the conditions of the pressure being 8MPa and the temperature being 50 DEG C to be used as displacement agents; and injecting the displacement agents into an oil reservoir. The method has the advantages that the surfactants capable of reducing the minimum miscibility pressure of carbon dioxide and crude oil can be preferably selected; and when the surfactants are added in the injected carbon dioxide for carbon dioxide displacement operation, the carbon dioxide displacement yield can be improved.
Description
Technical field
The present invention relates to carbon dioxide flooding oil assistant technical field, particularly relating to a kind of surfactant for improving the method for carbon dioxide flooding oil recovery.
Background technology
In recent years, due to the mankind's depending on unduly fossil fuels such as coal, oil, natural gases, in industry and human lives's process, the greenhouse gas emissions that produce increase day by day, and the greenhouse effect caused thus just in serious threat the environment that the mankind depend on for existence.In the greenhouse gases of mankind's discharge, more than 65% is carbon dioxide, has again about 69% to energy supply and use relevant in these carbon dioxide.How can realize the reduction of discharging of greenhouse gases, can meet again the growing energy demand of the mankind becomes the significant problem that international community faces.
Carbon dioxide flooding oil tech is that by postcritical CO 2 fluid, (carbon dioxide critical point is pressure 7.4MPa to one, temperature 31.2 DEG C) note in oil reservoir as oil displacement agent, the carbon dioxide injected is utilized to reduce viscosity of crude, improve oil and water mobility ratio, make crude oil volume expansion, increase the characteristic of oil reservoir energy, miscible-phase displacement can be realized under certain condition, thus reach expansion and involve degree, improve the object of oil recovery, initial oil in place recovery ratio can be increased by 20%, become one of important technology realizing the tertiary oil recovery technology improving oil recovery factor at present.Within 2014, improve in recovery ratio project at product, carbon dioxide drive project accounts for 38.9%, and wherein U.S.'s project is maximum, and gross annual output amount is 3890.2 ten thousand tons, accounts for 6% of the total crude output of the U.S. at present.
Laboratory experiment and field practice show, mixed phase drives (in displacement process, reservoir pressure is higher than the minimum miscibility pressure of crude oil and carbon dioxide) can crude oil more more than non-phase-mixing driving (in displacement process, reservoir pressure is lower than the minimum miscibility pressure of crude oil and carbon dioxide) extraction, generally, mixed phase drives than non-phase-mixing driving recovery ratio height about 5%-10%.Want to realize mixed phase to drive, strata pressure is higher than the minimum miscibility pressure of carbon dioxide and crude oil.But Some Domestic oil field is owing to being subject to the restriction that in-place oil heavy ingredient is many and temperature is high, causes the minimum miscibility pressure of carbon dioxide and crude oil higher, cannot reach mixed phase and drive, affect oil displacement efficiency.Although the mode can adopted less by many notes improves strata pressure (many carbon dioxide injections adopt crude oil less), the limited extent improved, also can affect field output.
Owing to there is above problem, carbon dioxide drive at present can't extensive use.
In displacement of reservoir oil field, surfactant is widely used in surfactant-alkali-polymer ternary combination flooding.In carbon dioxide flooding, CN103867169A discloses " gas soluble surfactants is used for the method in carbon dioxide drive mobility control ", gas soluble surfactants mixes in the ratio that quality proportion by subtraction is 0.1% ~ 1.5% with supercritical carbon dioxide by this technology, pressure during mixing is 7 ~ 20MPa, temperature is 40 DEG C ~ 90 DEG C, then injects oil reservoir.Gas soluble surfactants is applied in carbon dioxide drive by this technology first, but gas soluble surfactants Fatty alcohol polyoxyethylene polyoxypropylene ether (2EH-PO5-EO9) or NPE (TX-15) need be selected, utilize such surfactant to carry out underground foaming and control carbon dioxide mobility, swept volume can be expanded, but can not oil displacement efficiency be improved, indefinite to the increase rate of oil recovery factor, and the service condition of surfactant and alternative condition harshness, still can not be suitable for for those carbon dioxide and the higher oil field of crude oil minimum miscibility pressure.
Summary of the invention
The object of the present invention is to provide one can reduce carbon dioxide and crude oil minimum miscibility pressure, the method for economical and practical raising carbon dioxide flooding oil recovery.
Utilize surfactant to improve a method for carbon dioxide flooding oil recovery, it is characterized in that, step is as follows:
Surfactant is mixed formation surfactant-carbon dioxide compound oil displacement agent with carbon dioxide under CO 2 supercritical condition, this compound oil displacement agent is injected oil reservoir; In compound oil displacement agent, surfactant qualities concentration is less than the solubility of surfactant under this condition in supercritical carbon dioxide.
In above method, described super critical condition is pressure 8MPa, and temperature is 50 DEG C.Described surfactant is the surfactant containing close carbon dioxide group, and described close carbon dioxide group comprises perfluor ether, perfluoro alkane, siloxanes, tertiary amine, aliphatic ether, alkynol and acetylenic glycols etc.Described surfactant comprises silicon ether surfactant and polyether surfactant; Silicon ether surfactant is selected from one or more in allyl polyglycol (HMTS), three polyoxyethylene groups heptamethyltrisiloxanes (NTS-3), seven polyoxyethylene groups heptamethyltrisiloxanes (NTS-7), 12 polyoxyethylene groups heptamethyltrisiloxanes (NTS-12) and 16 polyoxyethylene groups heptamethyltrisiloxanes (NTS-16); Polyether surfactant is selected from one or more that tetradecyl alchohol five APEO (C14 (5)), hexadecanol three APEO (C16 (3)), hexadecanol five APEO (C16 (5)) and three polyethylene glycol gather in special hexadecanol ether (GC16 (3)) of shellfish.
Concrete, above method is at pressure 8MPa, temperature is under 50 DEG C of conditions, the solubility of described different surfaces activating agent in supercritical carbon dioxide is in 0.205wt% ~ 9.98wt% change, and surfactant is solubility described in 0.00061 ~ 0.00338 part to corresponding surfactant with the mass ratio of carbon dioxide: 1.Different surfactants and the proportioning of carbon dioxide change in the number range of 0.00061 ~ 0.00338:1, and the proportioning upper limit of same surfactant and carbon dioxide is its solubility in carbon dioxide.Such as, when surfactant is hexadecanol five APEO (C16 (5)), according to table 1 data, itself and carbon dioxide can be that 0.00061 ~ 0.363:1 mixes in mass ratio, and blend pressure is 8MPa, and temperature is 50 DEG C.The mixed proportion of other surfactants and carbon dioxide too can according to numerical value determination scope listed by table 1.
Another object of the present invention is to provide the oil displacement agent used in a kind of carbon dioxide drive, is the surfactant-carbon dioxide compound oil displacement agent mentioned in previous methods.
The preparation method of this oil displacement agent is that surfactant and carbon dioxide are mixed to get surfactant-carbon dioxide compound oil displacement agent under CO 2 supercritical condition.
Utilize this oil displacement agent, the invention provides a kind of method of carbon dioxide drive, be to undeveloped reserves (before water drive), use described oil displacement agent to inject under oil reservoir displacement pressure and temperature, injected slurry volume is generally 1.0PV; Described displacement pressure and temperature are greater than CO 2 supercritical condition.
Compared with prior art, the present invention has following features:
The invention provides a kind of method utilizing surfactant to improve carbon dioxide flooding oil recovery, the surfactant that can reduce carbon dioxide and crude oil minimum miscibility pressure is optimized by laboratory experiment, this surfactant is added at the carbon dioxide injected, carry out carbon dioxide drive operation, improve carbon dioxide flooding oil recovery.The surfactant that the present invention optimizes is because of with close carbon dioxide functional group, with carbon dioxide, there is good compatibility, parent carbon dioxide functional group comprises perfluor ether and perfluoro alkane, siloxanes, tertiary amine, aliphatic ether, alkynol and acetylenic glycols etc., after considering economic factors, preferred silicon ether and these two kinds of surfactants of polyethers.Compared with not adding the flooding method of surfactant in carbon dioxide, use the inventive method, once the contacting minimum miscibility pressure and can to decline 2.11-5.11MPa of carbon dioxide and crude oil, multiple-contact minimum miscibility pressure can decline 3.5-4.2MPa; Recovery ratio can improve 17.31-19.38 percentage point, obtains and improves recovery ratio effect preferably.
Accompanying drawing explanation
Figure 1 shows that and do not add surfactant (pure CO
2) minimum miscibility pressure fitting result figure.
Detailed description of the invention
In displacement of reservoir oil field, usually want to realize the carbon dioxide miscible displacement of reservoir, just need to improve strata pressure.In the present invention, inventor converts thinking, by reducing the method for the minimum miscibility pressure of carbon dioxide and crude oil, making strata pressure higher than the minimum miscibility pressure of carbon dioxide and crude oil, thus realizing the carbon dioxide miscible displacement of reservoir.Because the minimum miscibility pressure reducing carbon dioxide and crude oil reduces amplitude and do not limit, also can not affect field output, be therefore improve the comparatively feasible research direction of carbon dioxide flooding oil recovery.
Current Oilfields can screen oil reservoir before enforcement carbon dioxide mixed phase drives, and got rid of the oil reservoir cannot implementing the carbon dioxide miscible displacement of reservoir, therefore not too many research in reduction minimum miscibility pressure; Domesticly also be in the exploratory stage, be mainly miscible solvent method: namely before injection pure carbon dioxide, first inject miscible solvent slug, miscible solvent adopts alkane or mixed solvent (mixture etc. of benzinum, paraffins mixture, alcohol).Carbon dioxide and crude oil miscible pressure can be had reduction in various degree by this method, and improve recovery ratio to a certain extent, but alkane addition is higher, causes cost high, the economic benefit brought is not remarkable.
The present invention adopts solvent and carbon dioxide mix, but select and there is hydrophily simultaneously and mix with supercritical carbon dioxide compared with the surfactant of high carbon dioxide compatibility, obtain mixture and carry out the displacement of reservoir oil to replace pure carbon dioxide to inject subsurface deposit as oil displacement agent.
Below in conjunction with specific embodiment, further illustrate content of the present invention, and the present invention is further elaborated, but these embodiments there is any restriction to the present invention absolutely not.Those skilled in the art under the enlightenment of this manual to the embodiment of the present invention in any variation of doing all will be within the scope of the present invention.
Embodiment, surfactant-carbon dioxide compound oil displacement agent and preparation thereof
Adjust each parameter in the inventive method respectively by the explanation in table 1, provide the specific embodiment 1-9 utilizing surfactant to improve the method for carbon dioxide flooding oil recovery.
Concrete grammar is: the ratio being (0.00061:1) ~ (0.00338:1) in mass ratio by surfactant and supercritical carbon dioxide mixes and obtains surfactant-carbon dioxide compound oil displacement agent (fluid), then this compound oil displacement agent is injected oil reservoir.
Consider carbon dioxide critical point (pressure 7.4MPa, temperature 31.2 DEG C), select pressure to be 8MPa during embodiment mixing, temperature is 50 DEG C.Certainly, other value theory on carbon dioxide critical point all can complete the preparation of surfactant-carbon dioxide compound oil displacement agent, can consider in practical application that working condition, safety and economy etc. are because usually determining pressure and temperature numerical value, the present embodiment is only unrestricted as guiding to this.
About surfactant, the present invention selects has hydrophily and compared with the surfactant of high carbon dioxide compatibility and carbon dioxide mix simultaneously, containing close carbon dioxide group in this type of surfactant, comprise perfluor ether, perfluoro alkane, siloxanes, tertiary amine, aliphatic ether, alkynol and acetylenic glycols etc.Preferred surfactant is silicon ether surfactant and polyether surfactant.Wherein, silicon ether surfactant is selected from one or more in allyl polyglycol (HMTS), three polyoxyethylene groups heptamethyltrisiloxanes (NTS-3), seven polyoxyethylene groups heptamethyltrisiloxanes (NTS-7), 12 polyoxyethylene groups heptamethyltrisiloxanes (NTS-12) and 16 polyoxyethylene groups heptamethyltrisiloxanes (NTS-16); Polyether surfactant is selected from tetradecyl alchohol five APEO (C14 (5)), hexadecanol three APEO (C16 (3)), hexadecanol five APEO (C16 (5)) and three polyethylene glycol gather one or more in special hexadecanol ether (GC16 (3)) of shellfish.Comparative example surfactant is selected from Fatty alcohol polyoxyethylene polyoxypropylene ether (2EH-PO5-EO9), NPE (TX-15) (comparative example uses the surfactant in CN103867169A " gas soluble surfactants is used for the method in carbon dioxide drive mobility control ").Above surfactant is all purchased.
Under design temperature 50 DEG C, pressure 8MPa condition, the solubility of above-mentioned surfactant in supercritical carbon dioxide is 0.205wt% ~ 9.98wt% (specifically in table 1 data).In table 1, surfactant concentration wt% refers to the mass concentration of surfactant in compound oil displacement agent that each embodiment is selected, and the concentration that embodiment is selected is within aforementioned solubility range.Can consider the working concentration because usually determining surfactant such as surfactant kind, economy in practical application, table 1 is only unrestricted as guiding to this.
According to listed by table 1, be 8MPa at blend pressure, temperature is under 50 DEG C of conditions, in compound oil displacement agent of the present invention, surfactant and the mass ratio of carbon dioxide can be solubility described in 0.00061 ~ 0.00338 part to corresponding surfactant: 1, its implication is: different surfactants and the proportioning of carbon dioxide change in the number range of 0.00061 ~ 0.00338:1, and the proportioning upper limit of same surfactant and carbon dioxide is its solubility in carbon dioxide.Such as, when surfactant is hexadecanol five APEO (C16 (5)), according to table 1 data, itself and carbon dioxide can be that 0.00061 ~ 0.363:1 mixes in mass ratio.The mixed proportion of other surfactants and carbon dioxide can be determined according to numerical value listed by table 1 too, enumerates no longer one by one.
Table 1 surfactant-carbon dioxide compound oil displacement agent
In addition, table 1 listed only for blend pressure be 8MPa, temperature is the numerical value under 50 DEG C of conditions, at carbon dioxide critical point (pressure 7.4MPa, temperature 31.2 DEG C) more than when adjusting mixing condition, the solubility of each concrete surfactant in carbon dioxide and working concentration wt% all can change to some extent, and those skilled in the art can obtain the numerical value of change according to the present embodiment method, this part content also belongs to the disclosure of invention.
The surfactant below utilizing embodiment to prepare-carbon dioxide compound oil displacement agent carries out testing with the interfacial tension of crude oil, slim tube driving test, rock core displacement test.
Experimental example one, to test with the interfacial tension of crude oil
Under adopting high-pressure carbon dioxide interfacial tensimeter to measure 86 DEG C (Daqing oil fields recover the oil eight factory's reservoir temperatures), measure the interfacial tension adding carbon dioxide and crude oil after surfactant, set pressure when interfacial tension is zero as once contacting minimum miscibility pressure, method of testing is as follows:
(1) open high-pressure carbon dioxide injected system, open oil vessel heating and pipeline heating.
(2) open heating in still, open photograph light source.
(3) open software, catch image, correcting image magnifying power, adjustment image definition.
(4) adding surfactant to be measured to adding in thermal agitation instrument, adding a certain amount of carbon dioxide (to container pressure a little more than 8MPa), 50 DEG C are stirred more than 1h, surfactant are fully dissolved.
(5) after temperature stabilization, open the import of autoclave switch, carbon dioxide is slowly entered in still, regulation system is to goal pressure (8 ~ 45MPa); Regulate crude oil storage tank pressure extremely a little more than pressure in still (about 0.3MPa).
(6) carbon dioxide and oil sample density are set in the option-dropinformation of software; By three straight lines on the image that captures, two are put in pin neck place above, bottom one is put into oil droplet bore place, click trackerman-start automatically to start to catch image, open oil sample inlet valve, slow control oil droplet falls, and system automatic capturing oil droplet self-forming is to a series of images fallen.
(7) open the image that oil droplet is about to leave syringe needle, again matching magnifying power, after amendment correction value, system-computed goes out the interfacial tension under this pressure.
(8) pressure of regulation of carbon dioxide and oil, repeats step (6) and (7).
(9) experiment terminates, and ensures that carbon dioxide inlet valve cuts out, and the pump inlet connecting carbon dioxide and crude oil memory is closed, and closes heating in still, opens vent valve in still, slowly released by carbon dioxide; Open still, with in benzinum cleaning still.
Under the present invention tests 12 different pressures conditions, add the interfacial tension of carbon dioxide and crude oil after different surfaces activating agent, interfacial tension data are in table 2 and table 3, and to be calculated with the data fitting of table 3 by table 2 and once contact minimum miscibility pressure, data are in table 4.
Table 2 adds the interfacial tension data of carbon dioxide and crude oil after silicon ether surfactant
Table 3 adds the interfacial tension data of carbon dioxide and crude oil after polyether surfactant
After table 4 adds surfactant, carbon dioxide and crude oil once contacts minimum miscibility pressure
As can be seen from the data of table 4, in interfacial tension experiment, before adding surfactant, carbon dioxide is 54.82MPa with the minimum miscibility pressure that once contacts of crude oil, after adding silicon ether surfactant (embodiment 1-5), minimum miscibility pressure is 49.71-52.71MPa, shows that silicon ether surfactant has the characteristic reducing carbon dioxide and crude oil minimum miscibility pressure, the highlyest can reduce minimum miscibility pressure 5.11MPa.After adding embodiment polyether surfactant (embodiment 6-9), once contacting minimum miscibility pressure is 51.19-52.45MPa, show that polyether surfactant has the characteristic reducing carbon dioxide and crude oil minimum miscibility pressure, the highlyest can reduce minimum miscibility pressure 3.63MPa.And after adding comparative example surfactant, once contacting minimum miscibility pressure is 54.71-54.90MPa, show that comparative example surfactant does not have the characteristic reducing carbon dioxide and crude oil minimum miscibility pressure.
Experimental example two, with the slim tube driving test of crude oil
At adopting slim tube driving test corollary apparatus to measure 86 DEG C, the recovery ratio of different pressures condition carbon dioxide repelling crude oil, definition multiple-contact minimum miscibility pressure be oil recovery factor more than 90% time pressure, minimum miscibility pressure is calculated by the data fitting of table 5, in table 6, method of testing is as follows:
(1) according to formation oil physical data under high pressure, utilize natural gas and degassed crude to prepare formation oil at 85.9 DEG C, and measure its physical data under high pressure.
(2) find time after tubule heated constant temperature, with constant pressure pump by the saturated oil sample press-in thin tube model of preparation, stop when entering pump 2PV into pump, record injects the crude oil volume of coil pipe.
(3) manually pump, rises to predetermined pressure by back pressure, but lower than gas injection pressure 2MPa, turn on pump injecting carbon dioxide at constant pressure, and open tubule outlet valve.
(4) in displacement process, timing measures oil production, tolerance, gas injection rate, when gas drive to cumulative gas injected is greater than 1.2PV, stops displacement.
(5) after displacement terminates, toluene, benzinum are directly injected tubule, cleaning tubule, then, dries up pipeline with pressure-air, carries out the slim tube driving test under next pressure spot by process above.
Carry out 6 groups of experiments, after testing pure carbon dioxide and add surfactant respectively, the recovery ratio (see table 5) of 6 different pressures condition carbon dioxide repelling crude oils.
Table 5 adds slim-tube test result after surfactant
Table 6 adds the multiple-contact minimum miscibility pressure of carbon dioxide and crude oil after surfactant
After table 5 shows pure carbon dioxide and adds surfactant, the recovery ratio of 6 different pressures condition carbon dioxide repelling crude oils, result shows: when not adding/add surfactant, and the oil recovery factor of first three pressure, all lower than 90%, belongs to non-mixed phase state; The oil recovery factor of rear three pressure, all higher than 90%, belongs to mixed phase state.Straight line when oil recovery factor during by penetrating draws non-mixed phase and mixed phase with the change of pressure, the pressure corresponding to its intersection point is multiple-contact minimum miscibility pressure (as Fig. 1).Calculate multiple-contact minimum miscibility pressure by data fitting, data are in table 6.Do not add surfactant, pure carbon dioxide and the multiple-contact minimum miscibility pressure of crude oil are 41.3MPa (lower than once contacting minimum miscibility pressure), after adding embodiment silicon ethers, polyether surfactant, (with embodiment 1,8 and 9 for representative) multiple-contact minimum miscibility pressure is for 37.1MPa-37.8MPa, show that embodiment surfactant used has the characteristic reducing carbon dioxide and crude oil minimum miscibility pressure, the highlyest can reduce minimum miscibility pressure 4.2MPa.After adding comparative example surfactant, multiple-contact minimum miscibility pressure is respectively 41.0MPa, 41.1MPa, shows that comparative example surfactant does not have the characteristic reducing carbon dioxide and crude oil minimum miscibility pressure.
This experiment conclusion is identical with the conclusion of experimental example one.
Experimental example three, with the rock core displacement test of crude oil
Adopt the recovery ratio of rock core displacement test measurement device 86 DEG C of carbon dioxide repelling crude oils, setting displacement pressure is 38.0MPa, and method of testing is as follows:
(1) by after natural core extracting, oven dry, core arrangement is installed, by the abundant saturated rear record saturation capacity of formation water.
(2) adopt the water in the saturated oil sample displacement core prepared, set up stratum original oil water distribution, calculate irreducible water saturation.
(3) set displacement pressure, turn on pump injecting carbon dioxide or surfactant-carbon dioxide compound oil displacement agent then carry out displacement at constant pressure.
(4), in displacement process, recorded displacement time, pump reading, injection pressure, injection rate, ring pressure and back pressure, monitoring producing gas-oil ratio and isolated oil mass, tolerance and the water yield, when gas drive to cumulative gas injected is greater than 1.2PV, stopped displacement.
(5) often organize experiment and terminate rear cleaning rock core: first with benzinum and absolute alcohol cleaning rock core, then blow with nitrogen, and dry rock core system, then repeat step (1)-(4), after forming reset condition, carry out next group experiment.
Carried out 6 groups of experiments, after testing pure carbon dioxide and add surfactant respectively, the recovery ratio of carbon dioxide repelling crude oil, data are in table 7.
Table 7 adds carbon dioxide flooding long core experiment data after surfactant
Table 7 result shows: when not adding surfactant, belongs to non-mixed phase state, and non-phase-mixing driving oil recovery factor is 34.31%; Add embodiment when selecting silicon ethers, polyether surfactant (for embodiment 1,8,9), belong to mixed phase state, mixed phase repelling crude oil recovery ratio is 51.62%-53.70%, improves 17.31-19.38 percentage point than the recovery ratio not adding surfactant.When adding comparative example surfactant, belong to non-phase-mixing driving, non-phase-mixing driving oil recovery factor is 34.42%-34.51%, and with not add surfactant difference little, comparative example surfactant does not have the advantage improving recovery ratio.Known additionally by comparative analysis, the polyether surfactant C16 (5) that embodiment 8 is selected can reduce multiple-contact minimum miscibility pressure 3.5MPa, add concentration and be only 0.061wt%, and cost of production is lower than silicon ethers, can as preferred surfactant in actual production.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (10)
1. utilize surfactant to improve a method for carbon dioxide flooding oil recovery, it is characterized in that, step is as follows:
Surfactant is mixed formation surfactant-carbon dioxide compound oil displacement agent with carbon dioxide under CO 2 supercritical condition, this compound oil displacement agent is injected oil reservoir; In compound oil displacement agent, surfactant qualities concentration is less than the solubility of surfactant under this condition in supercritical carbon dioxide.
2. method according to claim 1, is characterized in that, described super critical condition is pressure 8MPa, and temperature is 50 DEG C.
3. method according to claim 1 and 2, it is characterized in that, described surfactant is the surfactant containing close carbon dioxide group, and described close carbon dioxide group comprises perfluor ether, perfluoro alkane, siloxanes, tertiary amine, aliphatic ether, alkynol and acetylenic glycols etc.
4. method according to claim 3, is characterized in that, described surfactant comprises silicon ether surfactant and polyether surfactant; Silicon ether surfactant is selected from one or more in allyl polyglycol (HMTS), three polyoxyethylene groups heptamethyltrisiloxanes (NTS-3), seven polyoxyethylene groups heptamethyltrisiloxanes (NTS-7), 12 polyoxyethylene groups heptamethyltrisiloxanes (NTS-12) and 16 polyoxyethylene groups heptamethyltrisiloxanes (NTS-16); Polyether surfactant is selected from one or more that tetradecyl alchohol five APEO (C14 (5)), hexadecanol three APEO (C16 (3)), hexadecanol five APEO (C16 (5)) and three polyethylene glycol gather in special hexadecanol ether (GC16 (3)) of shellfish.
5. method according to claim 4, it is characterized in that, pressure 8MPa, temperature is under 50 DEG C of conditions, the solubility of described different surfaces activating agent in supercritical carbon dioxide is in 0.205wt% ~ 9.98wt% change, and surfactant is solubility described in 0.00061 ~ 0.00338 part to corresponding surfactant with the mass ratio of carbon dioxide: 1.
6. according to the arbitrary described method of claim 1-5, it is characterized in that, in described compound oil displacement agent, surfactant is hexadecanol five APEO (C16 (5)), itself and carbon dioxide are that 0.00061 ~ 0.363:1 mixes in mass ratio, blend pressure is 8MPa, and temperature is 50 DEG C.
7. the oil displacement agent used in carbon dioxide drive, is characterized in that, is the surfactant-carbon dioxide compound oil displacement agent mentioned in the arbitrary described method of claim 1-6.
8. a preparation method for oil displacement agent described in claim 7, is characterized in that, surfactant and carbon dioxide are mixed to get surfactant-carbon dioxide compound oil displacement agent under CO 2 supercritical condition.
9. preparation method according to claim 8, it is characterized in that, the solubility of surfactant under temperature 50 C, pressure 8MPa super critical condition in carbon dioxide is 0.205wt% ~ 9.98wt%, in this super critical condition soffit activating agent and carbon dioxide solubility described in 0.00061 ~ 0.00338 to corresponding surfactant in mass ratio: 1 mixes.
10. a method for carbon dioxide drive, is characterized in that, to undeveloped reserves, use oil displacement agent described in claim 7 to inject under oil reservoir displacement pressure and temperature, injected slurry volume is 1.0PV; Described displacement pressure and temperature are greater than CO 2 supercritical condition.
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| CN115288644A (en) * | 2022-08-22 | 2022-11-04 | 大庆信辰油田技术服务有限公司 | Method for improving crude oil recovery ratio by combining hypotonic reservoir with carbon dioxide huff and puff |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4513821A (en) * | 1984-02-03 | 1985-04-30 | Mobil Oil Corporation | Lowering CO2 MMP and recovering oil using carbon dioxide |
| US4678036A (en) * | 1985-02-22 | 1987-07-07 | Mobil Oil Corporation | Miscible oil recovery process |
| CN102337874A (en) * | 2011-09-07 | 2012-02-01 | 西南石油大学 | Method for reducing minimum miscible phase pressure between CO2 and crude oil of miscible phase displacement |
| CN103867169A (en) * | 2014-04-02 | 2014-06-18 | 中国石油大学(华东) | Method for applying gas-soluble surfactant to fluidity control of carbon dioxide oil displacement |
| CN104194762A (en) * | 2014-08-04 | 2014-12-10 | 中国石油大学(北京) | Supercritical CO2 microemulsion and method for improving oil recovery factor |
| CN104610953A (en) * | 2015-02-02 | 2015-05-13 | 中国石油大学(华东) | Supercritical carbon dioxide microemulsion capable of reducing minimum miscible pressure of carbon dioxide and crude oil |
-
2015
- 2015-10-14 CN CN201510661789.XA patent/CN105257264A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4513821A (en) * | 1984-02-03 | 1985-04-30 | Mobil Oil Corporation | Lowering CO2 MMP and recovering oil using carbon dioxide |
| US4678036A (en) * | 1985-02-22 | 1987-07-07 | Mobil Oil Corporation | Miscible oil recovery process |
| CN102337874A (en) * | 2011-09-07 | 2012-02-01 | 西南石油大学 | Method for reducing minimum miscible phase pressure between CO2 and crude oil of miscible phase displacement |
| CN103867169A (en) * | 2014-04-02 | 2014-06-18 | 中国石油大学(华东) | Method for applying gas-soluble surfactant to fluidity control of carbon dioxide oil displacement |
| CN104194762A (en) * | 2014-08-04 | 2014-12-10 | 中国石油大学(北京) | Supercritical CO2 microemulsion and method for improving oil recovery factor |
| CN104610953A (en) * | 2015-02-02 | 2015-05-13 | 中国石油大学(华东) | Supercritical carbon dioxide microemulsion capable of reducing minimum miscible pressure of carbon dioxide and crude oil |
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