CN104449641A - Adjustor for reducing minimum miscible pressure of CO2 non-miscible flooding and application method thereof - Google Patents
Adjustor for reducing minimum miscible pressure of CO2 non-miscible flooding and application method thereof Download PDFInfo
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- CN104449641A CN104449641A CN201410602354.3A CN201410602354A CN104449641A CN 104449641 A CN104449641 A CN 104449641A CN 201410602354 A CN201410602354 A CN 201410602354A CN 104449641 A CN104449641 A CN 104449641A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/58—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
- C09K8/594—Compositions used in combination with injected gas, e.g. CO2 orcarbonated gas
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Abstract
The invention relates to an adjustor for reducing the minimum miscible pressure of CO2 non-miscible flooding and an application method thereof and belongs to the technical field of enhancing the oil recovery by CO2 flooding in an oil field. The adjustor is prepared from benzene homologs and derivates, ether matters, an oil soluble surfactant and a foaming agent. The application method comprises the following steps: (1) before carrying out CO2 flooding, injecting the adjustor into a reservoir by virtue of an injection well; and then braising the well till the adjustor is fully contacted with crude oil and dissolves; and (2) continuously injecting CO2 into the injection well till the gas-oil ratio in an output well exceeds the dissolved gas oil ratio under a formation condition. The adjustor provided by the invention has the beneficial effects that the adjustor can generate foam with CO2 to control the fluidity; meanwhile, as the benzene homologs and derivates, ether matters and oil soluble surfactant dissolved mutually promote so as to reduce the interfacial tension between CO2 and crude oil, so that the minimum miscible pressure of CO2 flooding is reduced, and the oil recovery of the CO2 flooding is improved to a great extent.
Description
Technical field
The present invention relates to a kind of reduction CO
2non-phase-mixing driving minimum miscibility pressure conditioning agent and application method thereof, belong to oil field CO
2drive and improve recovery efficiency technique field.
Background technology
Domestic and international research shows, injects CO
2reservoir pressure can be maintained, reduce viscosity of crude, improve gas-oil contact tension force, reach the object of mixed phase and near miscible flooding.According to U.S. Oil & Gas Journal magazine statistics in 2010, CO
2drive and become the maximum raising recovery ratio method of oil offtake in tertiary oil recovery, account for 42.4% of total petroleum production, it is main that external oil reservoir drives mainly with mixed phase, accounts for CO
297% of project, external CO
2drive and improve recovery ratio amplitude 7-20%; Domestic, CO has successively been carried out in the oil fields such as grand celebration, Central Plains, triumph
2oil displacement test, from implementation result, mixed phase drives raising recovery ratio effect and is better than non-phase-mixing driving.But, owing to being subject to the restriction of condition of formation pressure, also there is a large amount of CO
2non-phase-mixing driving situation, therefore studies and how to improve CO
2the recovery ratio of non-phase-mixing driving has great importance.
In crude oil, add conditioning agent, reduce CO
2-crude oil minimum miscibility pressure, making it to reach or realize the miscible-phase displacement close to condition of formation pressure, is improve CO
2an important method of non-phase-mixing driving recovery ratio.At present, the domestic thinking mainly adding certain volume liquefied gas at injecting gas is to reduce minimum miscibility pressure, and periodical " Chongqing University of Science and Technology journal (natural science edition) " the 14th volume the 1st phase document in 2012 " reduces CO
2displacement of reservoir oil minimum miscibility pressure novel method " in describe CO
2in be mixed into a certain amount of liquefied petroleum gas (LPG) and effectively can reduce CO
2and minimum miscibility pressure between crude oil; Application number is that the one that patent discloses of 201110262474.X reduces heavy crude reservoir CO
2drive the method for miscible pressure, its technical scheme is: first in oil well, inject surfactant slug, after tensio-active agent is dissolved in in-place oil, the viscosity of in-place oil is reduced to CO
2the range of viscosities that mixed phase drives; As injection CO
2after, tensio-active agent can reduce the interfacial tension between gas phase and oil phase very soon, thus reduces CO
2and the minimum miscibility pressure between crude oil, realizes the miscible-phase displacement.
In aforesaid method, CO
2in add liquefied petroleum gas (LPG) to there is cost as conditioning agent to the method reducing minimum miscibility pressure higher, the shortcoming of large usage quantity; And oil well injection oil soluble surfactant is easy to channelling after heterogeneous reservoir surfactant injects oil well, oil soluble surfactant is difficult to the shortcoming fully contacted with crude oil.
Summary of the invention
The object of the invention is the large defect with injecting the easy channelling of surfactant of conditioning agent consumption existed to overcome above-mentioned prior art, providing a kind of and reducing CO
2the conditioning agent of non-phase-mixing driving minimum miscibility pressure.
Another object of the present invention is to provide a kind of reduction CO
2the application method of the conditioning agent of non-phase-mixing driving minimum miscibility pressure.
To achieve these goals, the present invention is by the following technical solutions:
A kind of reduction CO
2the conditioning agent of non-phase-mixing driving minimum miscibility pressure, is made up of the material containing the structural formula shown in formula (1), formula (2) and formula (3):
Formula (1):
Formula (2): CH
3-(CH
2)
n-CH
3
Formula (3):
R in formula (1)
1=-CH
3,-CH
2cH
3,-CH
2cH
2cH
3or-CH
2cH
2cH
2cH
3;
N=3 in formula (2), 4;
M=11 in formula (3), 13,15; R
2=-CH
2cH
2cH
2-or
Described one reduces CO
2the conditioning agent of non-phase-mixing driving minimum miscibility pressure can also contain oil soluble surfactant.
Described oil soluble surfactant is the one in, Sorbitan fatty acid ester, butyl glycol ether, alkylphenol polyoxyethylene, tributyl phosphate, the different tri-n-butyl of phosphoric acid.
Described one reduces CO
2in the conditioning agent of non-phase-mixing driving minimum miscibility pressure, the mass concentration of each component is respectively: formula (1) structural material is 0.1%-0.5%, formula (3) structural material is 5%, oil soluble surfactant is 0.3%, and all the other are formula (2) structural material.
A kind of reduction CO
2the application method of the conditioning agent of non-phase-mixing driving minimum miscibility pressure, comprises the following steps:
(1) CO is being carried out
2before driving, inject a kind of reduction CO by Injection Well to reservoir
2and the conditioning agent of minimum miscibility pressure between crude oil, injection rate presses the percentage calculation of formation pore volume, is 0.1%-0.5%; Then stewing well to conditioning agent fully contacts with crude oil, dissolves;
(2) continue through Injection Well and inject CO
2, until gas oil ratio exceedes the solution gas-oil ratio under formation condition in withdrawal well.
The invention has the beneficial effects as follows:
(1) CO is carried out
2before oil displacement process or in oil displacement process, by Injection Well to the reduction CO described in the injection of stratum
2and the conditioning agent of minimum miscibility pressure between crude oil, the pore forming material in conditioning agent can be dissolved in local water and form foaming liquid, foaming liquid and CO
2effect generates CO
2foam, plays mobility control effect, impels the benzene class material in conditioning agent, ether material and the oil soluble surfactant three be dissolved in wherein to enter the higher reservoir of oil saturation, and fully contacts with crude oil, dissolves; Simultaneously benzene class material, ether material also add the stability of foam system, thus slow down the channelling of organic solvent and oil soluble surfactant, decrease invalid injection.
(2) the benzene class material in conditioning agent, ether material and the oil soluble surfactant three be dissolved in wherein can mutually promote and can reduce CO
2and the interfacial tension between crude oil, thus reduce CO
2drive minimum miscibility pressure.Increase substantially CO
2drive recovery ratio.
(3) interfacial tension between local water and crude oil can be reduced after the pore forming material in conditioning agent is dissolved in local water, increase the washing oil ability of local water formation crude oil.
Embodiment
Below in conjunction with embodiment, the present invention is further described.
Embodiment 1
(1) configuration adjustment agent
By 0.2g toluene, 94.8gCH
3-(CH
2)
4-CH
3, 5g dodecyl dimethyl azochlorosulfonate propyl lycine, mixes as miscible pressure conditioning agent stand-by, takes certain crude oil 99.9g, takes conditioning agent 0.1g and is dissolved in above-mentioned crude oil, and namely obtaining containing conditioning agent mass concentration is the crude oil sample of 0.1%.
(2) crude oil and CO
2between interfacial tension measure
This experimentation Crude Oil and CO
2between interfacial tensimeter adopt French TRACKER H interfacial tension/rheometer, adopt No. 18 syringe needles, measure 100 DEG C, CO under 16MPa condition
2and the interfacial tension between crude oil is 5.32mN/m; Measure 100 DEG C, CO under 16MPa condition
2with containing conditioning agent mass concentration be 0.1% the interfacial tension of above-mentioned crude oil sample be 4.12mN/m, interfacial tension lowering rate is 22.56%.
(3) CO
2drive THE MINIMUM MISCIBLE PRESSURE
THE MINIMUM MISCIBLE PRESSURE device adopts petroleum industry standard " SY/T 6573-2003 " to be configured, and thin tube model basic parameter used is in table 1.
Table 1 tubule basic parameter
Be under the condition of 100 DEG C in temperature, first record pure CO
2and the minimum miscibility pressure between this crude oil is 25.3MPa; The same experimental procedure according to defined in standard " SY/T6573-2003 " and requirement, be under the condition of 100 DEG C in temperature, record CO again
2and containing conditioning agent mass concentration be 0.1% above-mentioned crude oil sample between minimum miscibility pressure be 22.61MPa, minimum miscibility pressure reduced rate is 10.63%.
Embodiment 2
(1) configuration adjustment agent
By 0.3g toluene, 94.4gCH
3-(CH
2)
4-CH
3, 5g dodecyl dimethyl azochlorosulfonate propyl lycine, 0.3g butyl glycol ether, mixes as miscible pressure conditioning agent stand-by.Take certain crude oil 99.8g, take conditioning agent 0.2g and be dissolved in above-mentioned crude oil, namely obtaining containing conditioning agent mass concentration is the crude oil sample of 0.2%.
(2) crude oil and CO
2between interfacial tension measure
This experimentation Crude Oil and CO
2between interfacial tensimeter adopt French TRACKER H interfacial tension/rheometer, adopt No. 18 syringe needles, measure 100 DEG C, CO under 18MPa condition
2and the interfacial tension between crude oil is 4.35mN/m; Measure 100 DEG C, CO under 18MPa condition
2with containing conditioning agent mass concentration be 0.2% the interfacial tension of above-mentioned crude oil sample be 3.38mN/m, interfacial tension lowering rate is 22.30%.
(3) CO
2drive THE MINIMUM MISCIBLE PRESSURE
Experimental installation is identical with embodiment 1 with method.Be under the condition of 100 DEG C in temperature, first record pure CO
2and the minimum miscibility pressure between this crude oil is 25.8MPa; The same experimental procedure according to defined in standard " SY/T6573-2003 " and requirement, be under the condition of 100 DEG C in temperature, record CO again
2and containing conditioning agent mass concentration be 0.2% above-mentioned crude oil sample between minimum miscibility pressure be 21.47MPa, minimum miscibility pressure reduced rate is 16.78%.
Embodiment 3 ~ 10 step is identical with embodiment 1 with experimental temperature, shown in concrete table 2 composed as follows:
The each amounts of components table of table 2 conditioning agent
Table 3 is the situation that conditioning agent of the present invention reduces minimum miscibility pressure under different ingredients.
Table 3 effect assessment situation
| Embodiment | Minimum miscibility pressure reduced rate/% |
| 3 | 10.03 |
| 4 | 11.64 |
| 5 | 12.28 |
| 6 | 15.54 |
| 7 | 16.18 |
| 8 | 16.31 |
| 9 | 19.78 |
| 10 | 20.04 |
From table 3 experimental result, conditioning agent of the present invention can reduce CO
2and the interfacial tension between in-place oil, thus reduce CO
2and the minimum miscibility pressure 10%-20% between crude oil.
Claims (5)
1. one kind is reduced CO
2the conditioning agent of non-phase-mixing driving minimum miscibility pressure, is made up of the material containing structural formula formula (1), formula (2) and formula (3) Suo Shi, it is characterized in that:
Formula (1):
Formula (2): CH
3-(CH
2)
n-CH
3
Formula (3):
R in formula (1)
1=-CH
3,-CH
2cH
3,-CH
2cH
2cH
3or-CH
2cH
2cH
2cH
3;
N=3 in formula (2), 4;
M=11 in formula (3), 13,15; R
2=-CH
2cH
2cH
2-or
2. one according to claim 1 reduces CO
2the conditioning agent of non-phase-mixing driving minimum miscibility pressure, is characterized in that: containing oil soluble surfactant.
3. one according to claim 1 and 2 reduces CO
2the conditioning agent of non-phase-mixing driving minimum miscibility pressure, is characterized in that: described oil soluble surfactant is the one in, Sorbitan fatty acid ester, butyl glycol ether, alkylphenol polyoxyethylene, tributyl phosphate, the different tri-n-butyl of phosphoric acid.
4. one according to claim 1 and 2 reduces CO
2the conditioning agent of non-phase-mixing driving minimum miscibility pressure, it is characterized in that: the mass concentration of each component is respectively: formula (1) structural material is 0.1%-0.5%, formula (3) structural material is 5%, oil soluble surfactant is 0.3%, and all the other are formula (2) structural material.
5. one kind is reduced CO
2the application method of the conditioning agent of non-phase-mixing driving minimum miscibility pressure, is characterized in that adopting following steps: (1) is carrying out CO
2before driving, inject a kind of reduction CO by Injection Well to reservoir
2and the conditioning agent of minimum miscibility pressure between crude oil, injection rate presses the percentage calculation of formation pore volume, is 0.1%-0.5%; Then stewing well to conditioning agent fully contacts with crude oil, dissolves; (2) continue through Injection Well and inject CO
2, until gas oil ratio exceedes the solution gas-oil ratio under formation condition in withdrawal well.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410602354.3A CN104449641A (en) | 2014-10-31 | 2014-10-31 | Adjustor for reducing minimum miscible pressure of CO2 non-miscible flooding and application method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410602354.3A CN104449641A (en) | 2014-10-31 | 2014-10-31 | Adjustor for reducing minimum miscible pressure of CO2 non-miscible flooding and application method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN104449641A true CN104449641A (en) | 2015-03-25 |
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ID=52896407
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|---|---|---|---|
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105422066A (en) * | 2015-11-18 | 2016-03-23 | 中国石油大学(北京) | Method for reducing CO<2> flooding minimum miscible pressure |
| CN108979604A (en) * | 2018-08-02 | 2018-12-11 | 中国石油大学(华东) | A method of non-phase-mixing driving carbon dioxide mobility is controlled using oil-based foam |
| CN110068651A (en) * | 2018-01-23 | 2019-07-30 | 北京大学 | CO2Displacement of reservoir oil mixture-aid agent helps mixed effect evaluation method and CO2Displacement of reservoir oil mixture-aid agent screening technique |
| CN110922954A (en) * | 2019-12-02 | 2020-03-27 | 中国石油大学(北京) | Oil displacement method and oil displacement agent for tight oil reservoir and preparation method |
| CN112228018A (en) * | 2019-07-15 | 2021-01-15 | 中国石油化工股份有限公司 | CO with amidino compounds2Oil displacement method |
| CN113881417A (en) * | 2020-07-01 | 2022-01-04 | 中国石油化工股份有限公司 | Chemical agent composition containing sorbitan polyether carboxylate, preparation method thereof and CO reduction method thereof2Method for driving out minimum miscible pressure |
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|---|---|---|---|---|
| US4678036A (en) * | 1985-02-22 | 1987-07-07 | Mobil Oil Corporation | Miscible oil recovery process |
| US20060289157A1 (en) * | 2005-04-08 | 2006-12-28 | Rao Dandina N | Gas-assisted gravity drainage (GAGD) process for improved oil recovery |
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2014
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Patent Citations (2)
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|---|---|---|---|---|
| US4678036A (en) * | 1985-02-22 | 1987-07-07 | Mobil Oil Corporation | Miscible oil recovery process |
| US20060289157A1 (en) * | 2005-04-08 | 2006-12-28 | Rao Dandina N | Gas-assisted gravity drainage (GAGD) process for improved oil recovery |
Non-Patent Citations (2)
| Title |
|---|
| 张广东等: "混相溶剂法降低CO2驱混相压力研究", 《特种油气藏》 * |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105422066A (en) * | 2015-11-18 | 2016-03-23 | 中国石油大学(北京) | Method for reducing CO<2> flooding minimum miscible pressure |
| CN110068651A (en) * | 2018-01-23 | 2019-07-30 | 北京大学 | CO2Displacement of reservoir oil mixture-aid agent helps mixed effect evaluation method and CO2Displacement of reservoir oil mixture-aid agent screening technique |
| CN108979604A (en) * | 2018-08-02 | 2018-12-11 | 中国石油大学(华东) | A method of non-phase-mixing driving carbon dioxide mobility is controlled using oil-based foam |
| CN112228018A (en) * | 2019-07-15 | 2021-01-15 | 中国石油化工股份有限公司 | CO with amidino compounds2Oil displacement method |
| CN110922954A (en) * | 2019-12-02 | 2020-03-27 | 中国石油大学(北京) | Oil displacement method and oil displacement agent for tight oil reservoir and preparation method |
| CN113881417A (en) * | 2020-07-01 | 2022-01-04 | 中国石油化工股份有限公司 | Chemical agent composition containing sorbitan polyether carboxylate, preparation method thereof and CO reduction method thereof2Method for driving out minimum miscible pressure |
| CN113881417B (en) * | 2020-07-01 | 2023-04-07 | 中国石油化工股份有限公司 | Chemical agent composition containing sorbitan polyether carboxylate, preparation method thereof and CO reduction method thereof 2 Method for driving out minimum miscible pressure |
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Application publication date: 20150325 |
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