CN104533362A - Method for increasing volume expansion of CO2 and crude oil system liquid phase in non-miscible-phase displacement - Google Patents
Method for increasing volume expansion of CO2 and crude oil system liquid phase in non-miscible-phase displacement Download PDFInfo
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- CN104533362A CN104533362A CN201410808230.0A CN201410808230A CN104533362A CN 104533362 A CN104533362 A CN 104533362A CN 201410808230 A CN201410808230 A CN 201410808230A CN 104533362 A CN104533362 A CN 104533362A
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- crude oil
- raising agent
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- pressure
- oil
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/164—Injecting CO2 or carbonated water
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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
Abstract
The invention discloses a method for increasing volume expansion of CO2 and the crude oil system liquid phase in non-miscible-phase displacement. The method comprises the steps that during CO2 huff and puff in non-miscible-phase displacement, an expansion increasing agent is dissolved in CO2 and injected into a stratum at the speed of 0.2 mL/min-0.4 mL/min along with the CO2 to be mixed with crude oil. When the requirement for the minimum miscibility pressure of the CO2 and the crude oil can not be met under the stratum condition, by means of the method, the volume expansion effect of the crude oil can be improved under the stratum condition, so that the CO2 non-miscible-phase displacement effect is improved, and the crude oil recovery rate is increased.
Description
Technical field
The present invention relates to a kind of for non-phase-mixing driving increase CO
2the method expanded with crude oil system liquid phase volume, belongs to CO
2the technical field of the displacement of reservoir oil.
Background technology
Along with the intensification of exploration and development degree, domestic old filed production capacity reduces, and the waterflooding extraction in later stage can not improve oil recovery further.Because China's most oil fields reservoir condition is poor, hypotonic, the special hypotonic nontraditional reservoir of the many genus of undeveloped oil reservoir, exposes a lot of contradiction after input exploitation.There is stratum energy deficiency, the series of problems such as the fast and natural production capacity of pressure drop is low.For LOW PERMEABILITY RESERVOIR, waterflooding extraction is worthless often, and recovery ratio is all lower, and most domestic viscosity of crude is higher simultaneously, and conventional flooding method is also difficult to carry out.From foreign applications CO
2technology of reservoir sweep, is improved domestic technique and is continued to optimize, CO
2technology of driving still has great potential in the oil exploitation of China.
CO
2as a kind of good oil displacement agent with himself performance uniquely, at the scene and desk research have considerable scale.It also shows powerful advantage improving the application in LOW PERMEABILITY RESERVOIR and heavy crude reservoir.But, domestic to CO
2the research starting of driving is still more late, remains certain gap compared with abroad.In recent years along with the exploitation of viscous crude and low-permeability oil deposit, CO
2drive in fast-developing situation.Within 1963, first utilize CO at Daqing oil field
2drive and study as the main method improving recovery ratio, successively carried out note CO at 1966,1969,1985,1991,1994 subsequently
2pilot test.1996, Jiangsu Fumin Oilfield 48 well carried out CO
2to handle up test, and carried out CO
2drive test, accumulative implement 36 wells to the end of the year 2002, obtain good oil increasing effect, efficiently bring up to 87.5% by 33.3%.Ciyutuo Oilfield 13 fault block belongs to sandstone oil reservoir, and crude oil belongs to common heavy oil, has carried out CO in October, 2002 at this block thatch 21-133 well
2huff and puff oil recovery technique field trial, daily output crude oil 2.8t, day production fluid 14.3t, oil increasing effect is obvious, and viscosity of crude is down to 323mPas by original 680mPas.
The result of " on Chinese Continental, developed field improves recovery ratio second time Potential Evaluation and Study of developing strategy " shows, participate in evaluating 1.01 × 10
11in the reserves in the conventional thin oil oil field of t, be applicable to CO
2the crude oil reserve driven is about 1.23 × 10
10t, estimates to utilize CO
2drive and can increase recoverable reserves about 1.6 × 10
9t.In addition, for domestic existing explored 6.32 × 10
10the low-permeability oil deposit crude oil reserve of t, especially wherein about 50% reserves not yet employed, CO
2drive and have more obvious technical advantage than water drive.Although CO
2drive the dominant technology that technology not yet becomes investigation and application at home, but can predict, along with the development of technology and the expansion of range of application, domestic raising oil recovery factor application in the greenhouse gases total amount be sealed in oil reservoir will increase gradually, the industrial waste gas that earth environment makes a very bad impression is improved to Development Response of Oilfield by becoming China, improves the valuable source of oil recovery factor, CO
2driving will be improve the most promising method of Chinese Recovery Factor of Low-Permeability Reservoirs.
CO
2oil displacement process mainly comprises mixed phase and drives and non-phase-mixing driving, CO
2non-phase-mixing driving drive relative to mixed phase that to improve recovery ratio amplitude lower.But, because the most oil reservoir of China belongs to continental deposit, be different from external marine sediment, not only CO
2the minimum miscibility pressure (MMP) driven is higher than the minimum miscibility pressure of external marine sedimentary reservoir, and the CO of the most of oil reservoir of China
2the MMP driven is greater than the fracture pressure on stratum, causes the CO of China
2drive great majority and can only carry out non-phase-mixing driving.
CO
2non-phase-mixing driving is a kind of technology of raising recovery ratio of relative maturity, and as far back as nineteen fifty-nine, Martin is because of CO
2the technology that non-phase-mixing driving improves recovery ratio obtains four United States Patent (USP)s.Although the efficiency of its displacement of reservoir oil is driven low than mixed phase, be higher than the inert gas displacement of reservoir oil.With CO
2mixed phase drives difference, and under reservoir temperature, pressure, the reduction of oil phase viscosity and oil phase volume increase are recovered the oil to non-phase-mixing driving and played a major role.
Therefore, CO is improved
2non-phase-mixing driving effect becomes this area problem demanding prompt solution.
Summary of the invention
For solving the problems of the technologies described above, the object of the present invention is to provide a kind of for non-phase-mixing driving increase CO
2the method expanded with crude oil system liquid phase volume.
For arriving above-mentioned purpose, the invention provides a kind of for non-phase-mixing driving increase CO
2the method expanded with crude oil system liquid phase volume, wherein: at non-phase-mixing driving CO
2when handling up, raising agent is dissolved in CO
2in, with CO
2inject stratum with the speed of 0.2-0.4mL/min to mix with crude oil simultaneously.
In the above-mentioned methods, preferably, the consumption of described raising agent is CO
2the 2-5% of quality.
In the above-mentioned methods, preferably, described raising agent is the combination of one or more in methyl alcohol, ethanol, 1,2-PD, ethylenediamine, monoethanolamine, butanols.
In the above-mentioned methods, preferably, the temperature of the crude oil in described stratum is 60-100 DEG C.
In the above-mentioned methods, preferably, with the addition of the CO of raising agent described in
2be 7.6MPa-25MPa with the gas phase pressure of crude oil system.
In the above-mentioned methods, preferably, the process injected, uses injection pump by CO
2in gas inject crude oil.
The beneficial effect that the present invention produces is: after (1) adds raising agent under identical temperature pressure condition, CO
2crude oil cubical expansivity increasing degree >30% is made after dissolving in crude oil; (2) research on maximum utilized quantity of raising agent is no more than CO
25% of quality, consumption is few, and cost is low, has promotional value, is CO
2strong technical support is provided at the recycling of petroleum industry; (3) CO can be reduced
2with the interfacial tension of crude oil, thus reduce CO to a certain extent
2with the minimum miscibility pressure of crude oil.
Accompanying drawing explanation
Fig. 1 is the structural representation of visual phase kettle test device.
Fig. 2 adds the crude oil coefficient of cubical expansion of raising agent A at 70 DEG C and does not add the crude oil coefficient of cubical expansion of raising agent A and the relation curve of pressure in embodiment 1.
Fig. 3 is the CO adding raising agent A in embodiment 1 at 70 DEG C
2with the interfacial tension of crude oil and the CO not adding raising agent A
2with the interfacial tension of crude oil and the relation curve of pressure.
Fig. 4 adds the crude oil coefficient of cubical expansion of raising agent B at 80 DEG C and does not add the crude oil coefficient of cubical expansion of raising agent B and the relation curve of pressure in embodiment 2.
Fig. 5 adds the crude oil coefficient of cubical expansion of raising agent C at 60 DEG C and does not add the crude oil coefficient of cubical expansion of raising agent C and the relation curve of pressure in embodiment 3.
Main Reference label declaration:
1: visual phase still; 2: compression pump; 3: shuttle; 4:CCD video camera; 5: computer; 6: gas cylinder; 7: magnetic rotor.
Detailed description of the invention
In order to there be understanding clearly to technical characteristic of the present invention, object and beneficial effect, existing following detailed description is carried out to technical scheme of the present invention, but can not be interpreted as to of the present invention can the restriction of practical range.
Provided by the present invention for non-phase-mixing driving increase CO
2the method expanded with crude oil system liquid phase volume, can measure by test method the CO adding raising agent respectively
2and pure CO
2with the expanding volume of crude oil system liquid phase, thus prove to add the expansion effect that swollen dose can increase crude oil volume, adopt the experimental facilities shown in Fig. 1 to carry out, concrete steps are:
Under 60-100 DEG C of condition, the crude oil of certain volume is injected in visual phase still 1;
Make the CO from gas cylinder 6
2gas mixes with the raising agent from shuttle 3;
Compression pump 2 is utilized to the addition of the CO of raising agent
2gas or pure CO
2gas is pressed in visual phase still 1, until pressure reaches default mensuration pressure spot, stops injecting CO
2, start the stirring system (magnetic rotor 7) in phase still, along with CO
2in the middle of gas dissolution to crude oil, in visual phase still 1, pressure decreases, and when in pressure 40 minutes no longer after change, thinks to reach and balances each other, stop stirring, read liquid phase volume; In experimentation, ccd video camera 4 is utilized to record the situation of change in visual phase still 1 and be transferred to computer 5;
Make in the experimentation of crude oil volume expansion at the different raising agent of mensuration, all keep the pressure spot of identical mensuration volume expansion;
Contrast is added the cubical expansivity of raising agent and is not added the cubical expansivity of raising agent, draws cubical expansivity increasing degree.
Embodiment 1
Present embodiments provide a kind of for non-phase-mixing driving increase CO
2the method expanded with crude oil system liquid phase volume, concrete steps are as described below, and wherein raising agent A used is methyl alcohol.
Get the crude oil 30mL of 70 DEG C, inject visual phase still by the syringe of 50mL;
Get the high pressure resistant CO of a 1000mL
2intermediate receptacle, be filled with the CO of 7MPa in intermediate receptacle
2, pressure now is more conducive to raising agent A and is dissolved in CO
2in, between intermediate receptacle with visual phase still gas injection end, be connected the withstand voltage small container of a 5mL, fill 0.25g absorbent cotton in withstand voltage small container, by absorbent cotton absorption raising agent A, (consumption of raising agent A is for injecting CO
22.5% of quality), the effect of absorbent cotton is at injection CO
2process in make raising agent be dissolved in CO
2in and be carried in visual phase still, whole intermediate receptacle and withstand voltage small container are placed in the constant temperature oven of 70 DEG C;
In the process of experiment, by injecting CO
2improve the pressure in phase still, measured by the gas flowmeter be connected between intermediate receptacle and withstand voltage small container and inject CO
2amount, to mensuration different raising agent make, in the experimentation of crude oil volume expansion, all to keep identical pressure amplitude, namely at CO
2the process injected, the pressure spot measuring volume expansion all keeps identical, and concrete pressure spot is as follows:
7.6MPa→9.6MPa→14MPa→17MPa→20MPa→25MPa
Slow injection CO
2, at injection CO
2process in open the stirring system of visual phase still, to promote CO
2be diffused into faster in crude oil, when the pressure in visual phase still reaches predetermined pressure spot, stop injecting CO
2, continue to stir, stop after stirring 15min, after balance 40min, read liquid phase volume.
Fig. 2 adds the crude oil coefficient of cubical expansion of raising agent A at 70 DEG C and does not add the crude oil coefficient of cubical expansion of raising agent A and the relation curve of pressure in embodiment 1.As seen from Figure 2 in the pressure limit measured, the crude oil coefficient of cubical expansion adding raising agent A is larger than the crude oil coefficient of cubical expansion not adding raising agent A, as can be seen from Table 1, in 7.6MPa-25MPa pressure limit, adds the CO of raising agent A
2crude oil coefficient of cubical expansion increasing degree is made to be 33.80%-49.53%.
Get 6mL, the syringe of east, Ji crude oil 10mL of 70 DEG C is injected in the trace note sample pump of high pressure interface tensiometer, the temperature of note sample pump is adjusted to 70 DEG C, gets the high pressure resistant CO of a 1000mL
2intermediate receptacle, be filled with the CO of 7MPa in intermediate receptacle
2, between intermediate receptacle with HTHP interfacial tensimeter gas injection end, be connected the withstand voltage small container of a 5mL, fill 0.25g absorbent cotton in withstand voltage small container, by absorbent cotton absorption raising agent A, (consumption of raising agent A is for injecting CO
22.5% of quality), the effect of absorbent cotton is at injection CO
2process in make raising agent be dissolved in CO
2in and be carried in the cavity of HTHP interfacial tensimeter, whole intermediate receptacle and withstand voltage small container are placed in the constant temperature oven of 70 DEG C;
In the process of experiment, by injecting CO
2improve the pressure in visual phase still, measured by the gas flowmeter be connected between intermediate receptacle and withstand voltage small container and inject CO
2amount, manually control micro-sampling pump, form little oil droplet at syringe needle place slowly.
The present embodiment adopts ADSA technical Analysis to be suspended on the shape of the oil droplet on syringe needle, to measure CO under HTHP accurately
2with the interfacial tension of crude oil.Under 70 DEG C of (reservoir temperature) conditions, measure pure CO respectively
2the CO of/crude oil and interpolation raising agent A
2/ crude oil under 1.9MPa-43.3MPa pressure, CO
2with the interfacial tension of crude oil, add raising agent A to crude oil and CO to compare
2the impact of interfacial tension.
Fig. 3 is the CO adding raising agent A in embodiment 1 at 70 DEG C
2with the interfacial tension of crude oil and the CO not adding raising agent A
2with the interfacial tension of crude oil and the relation curve of pressure.As can be seen from Figure 3, in 1.9MPa-43.3MPa pressure limit, the CO of raising agent A is added
2the interfacial tension of/crude oil is all lower than CO
2the interfacial tension of/crude oil.When pressure reaches 43.3MPa, pure CO
2/ crude oil system interfacial tension reaches 3.28mN/m, and adds the CO of raising agent A
2the interfacial tension of/crude oil is reduced to 2.22mN/m.
Result shows, under the condition of 70 DEG C, adds the CO of raising agent A
2the interfacial tension of/crude oil in the pressure limit measured all lower than pure CO
2from another angle, the interfacial tension of/crude oil, proves that raising agent A can make the liquid phase volume of crude oil expand.
Table 1 adds crude oil cubical expansivity increasing degree after different raising agent
Embodiment 2
Present embodiments provide a kind of for non-phase-mixing driving increase CO
2the method expanded with crude oil system liquid phase volume, concrete steps are as described below, and wherein raising agent B used is ethanol.
Get east, the Ji crude oil 35mL of 80 DEG C, inject visual phase still by the syringe of 40mL;
Get the high pressure resistant CO of a 1000mL
2intermediate receptacle, be filled with the CO of 7MPa in intermediate receptacle
2, pressure now is more conducive to raising agent B and is dissolved in CO
2in, between intermediate receptacle with visual phase still gas injection end, be connected the withstand voltage small container of a 5mL, fill 0.25g absorbent cotton in withstand voltage small container, by absorbent cotton absorption raising agent B, (consumption of raising agent B is for injecting CO
23.5% of quality), the effect of absorbent cotton is at injection CO
2process in make raising agent be dissolved in CO
2in and be carried in visual phase still, whole intermediate receptacle and withstand voltage small container are placed in the constant temperature oven of 80 DEG C;
In experimentation, by injecting CO
2improve the pressure in phase still, measured by the gas flowmeter be connected between intermediate receptacle and withstand voltage small container and inject CO
2amount, to mensuration different raising agent make, in the experimentation of crude oil volume expansion, all to keep identical pressure amplitude, namely at CO
2the process injected, the pressure spot measuring volume expansion all keeps identical, and concrete pressure spot is as follows:
7.6MPa→9.6MPa→14MPa→17MPa→20MPa→25MPa
Slow injection CO
2, at injection CO
2process in open the stirring system of visual phase still, to promote CO
2be diffused into quickly in crude oil, when the pressure in visual phase still reaches predetermined pressure spot, stop injecting CO
2, continue to stir, stop after stirring 15min, after balance 40min, read liquid phase volume.
Fig. 4 adds the crude oil coefficient of cubical expansion of raising agent B at 80 DEG C and does not add the crude oil coefficient of cubical expansion of raising agent B and the relation curve of pressure in embodiment 2.As seen from Figure 4 in the pressure limit measured, the crude oil coefficient of cubical expansion adding raising agent B is larger than the crude oil coefficient of cubical expansion not adding raising agent B, as can be seen from Table 1, in 7.6MPa-25MPa pressure limit, adds the CO of raising agent B
2crude oil coefficient of cubical expansion increasing degree is made to be 39.41%-47.12%.
Embodiment 3
Present embodiments provide a kind of for non-phase-mixing driving increase CO
2the method expanded with crude oil system liquid phase volume, concrete steps are as described below, and wherein raising agent C used is the mixture of methyl alcohol, ethanol and butanols, and in this mixture, the volume ratio of methyl alcohol, ethanol, butanols is 8:1:1.
Get east, the Ji crude oil 25mL of 60 DEG C, inject visual phase still by the syringe of 30mL;
Get the high pressure resistant CO of a 1000mL
2intermediate receptacle, be filled with the CO of 7MPa in intermediate receptacle
2, pressure now is more conducive to raising agent C and is dissolved in CO
2in between intermediate receptacle with visual phase still gas injection end, be connected the withstand voltage small container of a 5mL, fill 0.25g absorbent cotton in withstand voltage small container, by absorbent cotton absorption raising agent C, (consumption of raising agent C is for injecting CO
25% of quality), the effect of absorbent cotton is at injection CO
2process in make raising agent be dissolved in CO
2in and be carried in visual phase still, whole intermediate receptacle and withstand voltage small container are placed in the constant temperature oven of 60 DEG C;
In experimentation, by injecting CO
2improve the pressure in phase still, measured by the gas flowmeter be connected between intermediate receptacle and withstand voltage small container and inject CO
2amount, to mensuration different raising agent make, in the experimentation of crude oil volume expansion, all to keep identical pressure amplitude, namely at CO
2the process injected, the pressure spot measuring volume expansion all keeps identical, and concrete pressure spot is as follows:
7.6MPa→9.6MPa→14MPa→17MPa→20MPa→25MPa
Slow injection CO
2, at injection CO
2process in open the stirring system of visual phase still, to promote CO
2be diffused into faster in crude oil, when the pressure in visual phase still reaches predetermined pressure spot, stop and inject CO
2, continue to stir, stop after stirring 15min, after balance 40min, read liquid phase volume.
Fig. 5 adds the crude oil coefficient of cubical expansion of raising agent C at 60 DEG C and does not add the crude oil coefficient of cubical expansion of raising agent C and the relation curve of pressure in embodiment 3.As seen from Figure 5 in the pressure limit measured, the crude oil coefficient of cubical expansion adding raising agent C is larger than the crude oil coefficient of cubical expansion not adding raising agent C, as can be seen from Table 1, in 7.6MPa-25MPa pressure limit, adds the CO of raising agent C
2crude oil coefficient of cubical expansion increasing degree is made to be 47.08%-65.47%.
Claims (6)
1. one kind increases CO for non-phase-mixing driving
2the method expanded with crude oil system liquid phase volume, wherein: at non-phase-mixing driving CO
2when handling up, raising agent is dissolved in CO
2in, with CO
2inject stratum with the speed of 02.-0.4mL/min to mix with crude oil simultaneously.
2. method according to claim 1, wherein: the consumption of described raising agent is CO
2the 2-5% of quality.
3. method according to claim 1 and 2, wherein: described raising agent is the combination of one or more in methyl alcohol, ethanol, 1,2-PD, ethylenediamine, monoethanolamine, butanols.
4. according to the method in any one of claims 1 to 3, wherein: the temperature of the crude oil in described stratum is 60-100 DEG C.
5. method according to any one of claim 1 to 4, wherein: described in the addition of the CO of raising agent
2be 7.6MPa-25MPa with the gas phase pressure of crude oil system.
6. method according to claim 1, wherein: the process injected, uses injection pump by CO
2in gas inject crude oil.
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| CN105403347A (en) * | 2015-11-27 | 2016-03-16 | 中国石油化工股份有限公司 | Measurement and determination method for minimum miscible pressure of CO2 flooding and special-purpose apparatus thereof |
| 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 |
| CN107178345A (en) * | 2016-03-11 | 2017-09-19 | 中国石油化工股份有限公司 | A kind of composition is in reduction CO2With the application in crude oil minimum miscibility pressure |
| CN107828401A (en) * | 2017-06-08 | 2018-03-23 | 中国石油化工股份有限公司 | One kind enhancing CO2Dissolve each other, reduce the oil driving additive of viscosity of crude with crude oil |
| CN107828402A (en) * | 2017-06-08 | 2018-03-23 | 中国石油化工股份有限公司 | One kind improves deep-layer heavy crude CO2The chemical addition agent of gas drive process recovery ratio |
| CN108194065A (en) * | 2018-01-19 | 2018-06-22 | 中国石油大学(华东) | The method for recovery ratio of being handled up using carbon dioxide/cosolvent system raising shale oil |
| CN108593190A (en) * | 2018-06-25 | 2018-09-28 | 青岛科技大学 | A kind of new method determining CO2/ oil-based system minimum miscibility pressures using oil phase hanging drop volume change |
| 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 |
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| 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 |
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| 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 |
| CN108593190A (en) * | 2018-06-25 | 2018-09-28 | 青岛科技大学 | A kind of new method determining CO2/ oil-based system minimum miscibility pressures using oil phase hanging drop volume change |
| CN108593190B (en) * | 2018-06-25 | 2023-12-19 | 青岛科技大学 | Novel method for determining minimum miscible pressure of CO 2/oil phase system by utilizing oil phase hanging drop volume change |
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