CN105422066A - Method for reducing CO<2> flooding minimum miscible pressure - Google Patents
Method for reducing CO<2> flooding minimum miscible pressure Download PDFInfo
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- CN105422066A CN105422066A CN201510795178.4A CN201510795178A CN105422066A CN 105422066 A CN105422066 A CN 105422066A CN 201510795178 A CN201510795178 A CN 201510795178A CN 105422066 A CN105422066 A CN 105422066A
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- pressure
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- crude 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
Abstract
The invention provides a method for reducing the CO<2> (carbon dioxide) flooding minimum miscible pressure. According to the method, during CO<2> miscible flooding, a miscible reducing agent is dissolved into CO<2>; the miscible reducing agent and the CO<2> are injected into the stratum at the same time and are mixed with crude oil in the stratum; the miscible reducing agent comprises one or combination of several materials from methanol, ethyl alcohol, ethanediol, propanol, ethylenediamine and butanol. The method for reducing the CO<2> (carbon dioxide) flooding minimum miscible pressure has the advantages that the CO<2> flooding minimum miscible pressure can be effectively reduced; the consumption of the miscible reducing agent is low; the cost is low; the popularization value is realized; and the powerful technical support is provided for the utilization of the CO<2> as resources in petroleum industry.
Description
Technical field
The present invention relates to a kind of method reducing carbon dioxide drive minimum miscibility pressure, belong to carbon dioxide drive technical field.
Background technology
Along with growing continuously and fast of Chinese national economy, oil demand is powerful, and consumption figure constantly increases; As China is about 4.88 hundred million tons the consumption of petroleum amount of 2013, the consumption of petroleum amount of 2014 is about 5.08 hundred million tons.But within 2013, crude oil in China output is about 2.08 hundred million tons, and within 2014, crude oil in China output is only about 2.1 hundred million tons, and domestic crude output fluctuates, and causes imbalance between supply and demand to become increasingly conspicuous.Trace it to its cause, on the one hand, China's major part oil field belongs to continental deposit, reservoir heterogeneity is serious, waterflood recovery efficiency factor is lower, and many oil fields enter mid-later development phase at present all, there is water ratio in oil well higher, production decline is very fast, and conventional waterflooding development technique improves the problems such as recovery ratio difficulty; On the other hand, in the land newly-increased petroleum reserves of China, in low more and more higher with extra-low permeability oil reservoirs proportion.Particularity due to low-permeability oil deposit causes waterflooding efficiency low, and chemical flooding cost is high, even if water drive and chemical flooding is technical can be used, is also difficult to the practical technique becoming low Permeability reservoir for improving recovery factor; And comprise note CO
2in one of method that interior gas injecting mining method is then current low Permeability reservoir for improving recovery factor most prospect.
Domestic and international desk research and on-the-spot application result show, CO
2the displacement of reservoir oil is a kind of method of effective raising oil recovery factor.In the application of raising recovery ratios all abroad, CO
2the displacement of reservoir oil is the raising recovery efficiency technique that ranked second position, and achieves good development effectiveness, wherein, carries out note CO all
2in the country of the displacement of reservoir oil, the project of carrying out with the U.S. is maximum, first business-like note CO
2displacement of reservoir oil project occurs in 1972, just at the Si Kali of Texas, USA, is referred to as SACROC (ScurryAreaCanyonReefOperatorsCommittee) by people.Recovery ratio project improves in the U.S. analyzed as can be seen from 1988 to 2008, and the crude output that the method adopting thermal recovery to improve recovery ratio is produced is substantially along with the carrying out of time presents the trend of successively decreasing; And adopt CO
2the displacement of reservoir oil improves the method for recovery ratio just in time in contrast, from 1986 till now, and CO
2the output of the displacement of reservoir oil presents the trend increased progressively along with the carrying out of time, and the trend risen in recent years is more obvious.
CO has successively been carried out in the oil fields such as domestic triumph, Central Plains, Jiangsu, grand celebration, Renqiu, the Liaohe River and Jilin
2the displacement of reservoir oil improves the experiment of recovery ratio, and average raising recovery ratio about 15%, achieves good development effectiveness.The strategic planning report of oil exploration academy of China Petrochemical Industry proposes: the major way that China Petrochemical Industry's gas drive oil recovery improves recovery ratio is CO
2driving recovers the oil improves recovery ratio, wherein covers reserves and is about 6.40 hundred million tons; Wherein, mixed phase drives and covers reserves 3.44 hundred million tons, and improve oil recovery factor about 15.8%, recoverable reserves increases by 5,430 ten thousand tons; Immiscible flood covers reserves 2.96 hundred million tons, and improve oil recovery factor about 8.5%, recoverable reserves increases by 2,518 ten thousand tons.
Although CO
2technology of reservoir sweep not yet becomes the dominant technology of 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 one of 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, and theoretical and experiment all shows CO
2the recovery ratio that mixed phase drives apparently higher than non-phase-mixing driving, therefore U.S. CO for a long time
2drive and improve the oil recovery factor mode of mainly driving with mixed phase and carry out, the output that mixed phase drives item number and improves recovery ratio is much larger than non-phase-mixing driving.For 2014 annual datas, CO
2driving total item number is 137, and wherein mixed phase drives item number 128, non-phase-mixing driving item number only 9; CO
2driving total output improving recovery ratio is 1,371 ten thousand tons/year, and wherein mixed phase drives output 1,264 ten thousand tons/year, non-phase-mixing driving output only 1,070,000 tons/year.
CO
2if inject oil reservoir can reach mixed phase with the crude oil on stratum, CO can be made
2the recovery ratio of driving increases substantially.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, oil displacement efficiency is had a strong impact on.If can CO be reduced
2the MMP driven, oil displacement process is expected to reach miscible-phase displacement, and the effect improving recovery ratio can significantly improve.
Therefore, CO is reduced
2displacement of reservoir oil minimum miscibility pressure (MMP) becomes this area problem demanding prompt solution.
Summary of the invention
In view of the defect that above-mentioned prior art exists, the object of the invention is to propose a kind of method reducing carbon dioxide drive minimum miscibility pressure, can CO be reduced
2the minimum miscibility pressure driven.
Object of the present invention is achieved by the following technical programs:
Reduce a method for carbon dioxide drive minimum miscibility pressure, it is at CO
2during the miscible displacement of reservoir, downmix agent is dissolved in CO
2in, with CO
2inject stratum simultaneously, and mix with the crude oil in stratum;
Wherein, described downmix agent comprises the combination of one or more in methyl alcohol, ethanol, ethylene glycol, propyl alcohol, ethylenediamine and butanols.
In the method for above-mentioned reduction carbon dioxide drive minimum miscibility pressure, the consumption of downmix agent can adjust according to actual conditions, can be CO
2any ratio of quality; Preferably, the consumption of described downmix agent is CO
2the 1%-4% of quality.
In the method for above-mentioned reduction carbon dioxide drive minimum miscibility pressure, preferably, at CO
2during the miscible displacement of reservoir, CO
2minimum injection pressure be 7MPa.
In the method for above-mentioned reduction carbon dioxide drive minimum miscibility pressure, preferably, the temperature of the crude oil in described stratum is 50-120 DEG C.
Outstanding effect of the present invention is:
1) under identical temperature condition, CO
2after the agent of middle interpolation downmix, CO
2displacement of reservoir oil minimum miscibility pressure reduces amplitude can be greater than 15%, and oil recovery factor increases obviously;
2) research on maximum utilized quantity of downmix agent is no more than CO
24% 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.
Accompanying drawing explanation
Fig. 1 is the structural representation of visual phase kettle test device in embodiment 1;
Fig. 2 is slim-tube test device schematic diagram in embodiment 3;
Fig. 3 is the CO not adding downmix agent I in embodiment 1 at 60 DEG C
2with the state of crude oil and the CO adding downmix agent I
2with the state of crude oil with pressure trend figure;
Fig. 4 is the CO not adding downmix agent II in embodiment 2 at 80 DEG C
2with the interfacial tension of crude oil and the graph of relation of pressure;
Fig. 5 is the CO adding downmix agent II in embodiment 2 at 80 DEG C
2with the interfacial tension of crude oil and the graph of relation of pressure;
Fig. 6 is the CO not adding downmix agent III in embodiment 3 at 70 DEG C
2the graph of relation of displacement of reservoir oil slim-tube test recovery ratio and experimental pressure;
Fig. 7 is the CO adding downmix agent III in embodiment 3 at 70 DEG C
2the graph of relation of displacement of reservoir oil slim-tube test recovery ratio and experimental pressure.
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.Experimental technique described in following embodiment, if no special instructions, is conventional method; Described reagent and material, if no special instructions, all can obtain from commercial channels.
Embodiment 1
The present embodiment provides a kind of method reducing carbon dioxide drive minimum miscibility pressure, and the method is at CO
2during the miscible displacement of reservoir, downmix agent I is dissolved in CO
2in, with CO
2inject stratum simultaneously, and mix with the crude oil in stratum.
Wherein, described downmix agent I is the mixture of propyl alcohol, butanols and ethylenediamine, and in this mixture, the volume ratio of propyl alcohol, butanols, ethylenediamine is 4:5:1.The injection rate of downmix agent is CO
23.0% of quality.
Described crude oil is Shengli crude, and the temperature of crude oil is 60 DEG C.
Experimental verification is carried out to the method for the reduction carbon dioxide drive minimum miscibility pressure of the present embodiment, by observing the CO not adding downmix agent I at 60 DEG C
2with the state of crude oil and the CO adding downmix agent I
2with the state of crude oil with pressure trend, prove that adding downmix agent I can reduce CO
2displacement of reservoir oil minimum miscibility pressure.
Experimental verification device used as shown in Figure 1, comprises ccd video camera 1, visual phase still 2, magnetic rotor 3, the gas tank 4 of band piston, computer 5, shuttle 6 and compression pump 7;
Ccd video camera 1 and computer 5 are electrically connected, and for detecting and record the phase-state change of visual phase still 2;
Magnetic rotor 3 is arranged in visual phase still 2;
Visual phase still 2 is connected with the output of shuttle 6 with the output of the gas tank 4 of band piston respectively, and the confined pressure end of gas tank 4 of band piston is connected with compression pump 7 respectively with the confined pressure end of shuttle 6.
This experimental verification device used is also provided with the manometer PG detected on the spot, for detecting the pressure in visual phase still.This experimental verification device used is also provided with multiple valves, for the opening and closing of control piper.This experimental verification device used is also provided with a withstand voltage small container 13, this is withstand voltage small container 13 and visual phase still 2 be with the gas tank 4 of piston and be connected respectively.
Experimental verification concrete steps are as follows:
Use the syringe of 30mL to measure the Shengli crude 30mL that temperature is 60 DEG C, and be injected in visual phase still 2;
First in withstand voltage small container 13, fill 0.5g absorbent cotton, by absorbent cotton absorption downmix agent I, (consumption of downmix agent I is for injecting CO
23.0% of quality), at injection CO
2process in downmix agent I will be dissolved in CO
2in, with CO
2enter together in visual phase still 2.Get the gas tank 4 (withstand voltage) that a 2L is with piston, in it, be filled with the CO of 7MPa
2.According to Fig. 1 by withstand voltage small container and gas tank insert experiment device, and the gas tank of withstand voltage small container and band piston is placed in the constant temperature oven of 60 DEG C;
In experimentation, utilize compression pump 7 by pure CO
2gas or with the addition of the CO of downmix agent I
2gas slowly is pressed in visual phase still 2.For the pure CO of observation
2with crude oil and the CO adding downmix agent I
2with crude oil mixed phase process, all identical pressure amplitude to be kept, namely at CO
2the process injected, observes CO
2all keep identical with the pressure spot of crude oil mixed phase state, concrete pressure spot is as follows:
8MPa→10MPa→14MPa→20MPa→25MPa
At injection CO
2process in open the stirring system (magnetic rotor 3) 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 (above-mentioned specific concrete pressure spot), stop injecting CO
2, continue to stir, stop after stirring 15min, after balance 40min, image taking is carried out to the situation in phase still, and compares.
Fig. 3 is the CO not adding downmix agent I in the present embodiment at 60 DEG C
2with the state of crude oil and the CO adding downmix agent I
2with the state of crude oil with pressure trend figure.Can clearly be found out by Fig. 3, along with the increase of pressure, oil phase and supercritical CO
2the colour-difference of phase reduces gradually, and adds the supercritical CO of downmix agent I
2phase color is all the time than the supercritical CO not adding downmix agent I
2phase color is dark.When pressure is 25MPa, in the phase still of interpolation downmix agent I, can't see CO
2and the boundary between crude oil, illustrates the CO adding downmix agent I
2reach mixed phase state with crude oil at 25MPa, and still clearly can find out supercritical CO in the phase still not adding downmix agent I
2with the boundary of crude oil, the CO not adding downmix agent I is described
2mixed phase state is not yet reached at 25MPa with crude oil.Image comparison draws the CO adding downmix agent I
2easier and Shengli crude reaches mixed phase state, adds downmix agent I and can reduce carbon dioxide drive minimum miscibility pressure.
Embodiment 2
The present embodiment provides a kind of method reducing carbon dioxide drive minimum miscibility pressure, and the method is at CO
2during the miscible displacement of reservoir, downmix agent II is dissolved in CO
2in, with CO
2inject stratum simultaneously, and mix with the crude oil in stratum.
Wherein, described downmix agent II is the mixture of methyl alcohol and ethylene glycol, and in this mixture, the volume ratio of methyl alcohol and ethylene glycol is 7:3.The injection rate of downmix agent is CO
23.0% of quality.
Described crude oil is east, Ji crude oil, and the temperature of crude oil is 80 DEG C.
Experimental verification is carried out to the method for the reduction carbon dioxide drive minimum miscibility pressure of the present embodiment:
Measure with the syringe that specification is 5mL east, the Ji crude oil 5mL that temperature is 80 DEG C, and be injected in the micro-sampling pump of high pressure interface tensiometer, sampling pump temperature is set to 80 DEG C;
In withstand voltage small container, fill 0.5g absorbent cotton, by absorbent cotton absorption downmix agent II, (consumption of downmix agent II is for injecting CO
23.0% of quality), at injection CO
2process in downmix agent II will be dissolved in CO
2in, with CO
2enter together in the cavity of HTHP interfacial tensimeter.Get the pressure gas cylinder that a 2L is with piston, in gas tank, be filled with the CO of 1.5MPa
2, withstand voltage small container is connected between gas tank and interfacial tensimeter gas injection end.The gas tank of withstand voltage small container and band piston is placed in the constant temperature oven of 80 DEG C;
In the process of experiment, by injecting CO
2improve the pressure in HTHP interfacial tensimeter cavity, manually control micro-sampling pump, form little oil droplet at syringe needle place lentamente.
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 exactly
2with the interfacial tension of crude oil.Under 80 DEG C of conditions, measure pure CO respectively
2with crude oil and the CO adding downmix agent II
2with the interfacial tension of crude oil under 1.5MPa-44MPa pressure.
Fig. 4 is the CO not adding downmix agent II in the present embodiment at 80 DEG C
2with the interfacial tension of crude oil and the relation curve of pressure.As can be seen from Figure 4, when pressure is lower than 9.6MPa (comprising 9.6MPa), CO
2with the interfacial tension of crude oil along with the increase of pressure linearly declines, therefore carry out linear regression to pressure lower than the data point of 9.6MPa, intercept A is 29.5, and slope B is-1.94, incidence coefficient R is 0.99, and calculating light components miscible pressure P in crude oil by recurrence calculating formula is 15.14MPa.When pressure is greater than 16.1MPa, CO
2with crude oil equilibrium interfacial tension along with pressure increase is approximately linear decline relation.Therefore carry out linear regression to the data between 16.1MPa-35.3MPa, intercept A is 8.5, and slope B is-0.14, and incidence coefficient R is 0.93, calculates the CO not adding downmix agent II by recurrence calculating formula
2be 57.75MPa with the miscible pressure P of crude oil.
Fig. 5 is the CO adding downmix agent II in the present embodiment at 80 DEG C
2with the interfacial tension of crude oil and the relation curve of pressure.When pressure is lower than 9.6MPa, linear regression is carried out to data point, intercept A is 25.38, and slope B is-1.83, and incidence coefficient R is 0.99, calculating light components miscible pressure P in crude oil by recurrence calculating formula is 13.84MPa, carry out linear regression to the data between 16.1MPa-33.1MPa, intercept A is 8.37, and slope B is-0.16, incidence coefficient is 0.960, calculates the CO adding downmix agent II by recurrence calculating formula
2be 51.83MPa with the miscible pressure P of crude oil.
Can be drawn by Fig. 4 and Fig. 5, adding downmix agent II at 80 DEG C can make CO
2reduce 1.3MPa with the miscible pressure of east, Ji crude oil light components, make CO
25.92MPa is reduced with the miscible pressure of east, Ji crude oil.Therefore, add downmix agent and can reduce CO
2displacement of reservoir oil minimum miscibility pressure.
Embodiment 3
The present embodiment provides a kind of method reducing carbon dioxide drive minimum miscibility pressure, and the method is at CO
2during the miscible displacement of reservoir, downmix agent III is dissolved in CO
2in, with CO
2inject stratum simultaneously, and mix with the crude oil in stratum.
Wherein, described downmix agent III is the mixture of ethanol, butanols and ethylenediamine, and in this mixture, the volume ratio of ethanol, butanols and ethylenediamine is 5:3:2.The injection rate of downmix agent is CO
24.0% of quality.
Described crude oil is east, Ji crude oil, and the temperature of crude oil is 70 DEG C.
Experimental verification is carried out to the method for the reduction carbon dioxide drive minimum miscibility pressure of the present embodiment, is measured the CO not adding downmix agent III by slim-tube test respectively
2the CO of displacement of reservoir oil minimum miscibility pressure and interpolation downmix agent III
2displacement of reservoir oil minimum miscibility pressure, thus prove that adding downmix agent can reduce CO
2displacement of reservoir oil minimum miscibility pressure.
Experimental verification device used as shown in Figure 2, comprises high pressure constant voltage constant speed pump 8, injectant reservoir vessel 9, thin tube model 10, high pressure visable pipe 11, back-pressure valve (back pressure regulator) 12 and withstand voltage small container 13.
High pressure constant voltage constant speed pump 8, injectant reservoir vessel 9, withstand voltage small container 13, thin tube model 10, high pressure visable pipe 11 are connected successively with back-pressure valve 12.
This thin tube model 10 is experiment tubule, long 12m, internal diameter 4.5mm, and inside is filled by 80-100 order quartz sand.
Above-mentioned back-pressure valve 12 is also connected with a separate high pressure constant voltage constant speed pump respectively with a graduated cylinder.
The device that the experimental verification of the present embodiment is used is also provided with multiple valves, for the opening and closing of control piper.
Experimental verification concrete steps are carried out according to petroleum industry standard SY/T6573-2003, as described below:
First the voids volume measuring thin tube model 10 is needed.Thin tube model 10 is placed in insulating box, temperature is set as testing temperature required (70 DEG C), the suitable solvent of certain volume (as toluene, chloroform and methyl alcohol) is used to clean thin tube model successively, clean up rear dry high pressure nitrogen and dry up solvent in tubule, after continuing to dry 12h, under the condition keeping experimental temperature, close tubule inlet valve.Tubule outlet valve is connected on vacuum pump and vacuumizes, after being evacuated to-0.1MPa, continue to take out more than 12h.With displacement pump cyclohexane be full of and rinse the pipeline to tubule inlet valve, pressure being increased to required experimental pressure, records the primary pump reading under this pressure.Open tubule inlet valve, enter infusion and enter cyclohexane, be pressurized to identical experimental pressure, after pressure is fully stable, record now enters the reading of pump, is the voids volume of thin tube model 10 after the difference of pump volume reading is calibrated.Adopt similar approach, measure the volume between thin tube model 10 outlet valve and back-pressure valve 12 adjuster, itself and pore volume of thin tube model sum are the total pore size volume of thin tube model 10;
After being cleaned up by experimental facilities, high pressure nitrogen is utilized to dry up whole device.Temperature is set as testing temperature required (70 DEG C), and keep constant, after drying 12h, under the condition keeping experimental temperature, adopt high pressure constant speed constant flow pump with east, 0.2mL/min flow velocity saturated Ji crude oil, after thin tube model port of export stabilization of crude oil flows out, by thin tube model 10 outlet valve and high pressure visable window 11, back-pressure valve 12 connects, by back-pressure valve adjuster, back pressure is set to the required force value of experiment, continue to utilize high pressure constant speed constant flow pump that sample is pressurized to more than experimental pressure, after crude oil sample displacement at least reaches 1.5 times of voids volumes (PV), terminate crude oil saturation process, and more than constant temperature 2h,
CO will be full of
2high pressure piston container put into insulating box, constant 12h under experimental temperature, until gas pressure is constant in piston container, the withstand voltage small container of a 10mL is connected in the rear end (i.e. the front end of tubule entrance) of gas tank, fill absorbent cotton in withstand voltage small container, by absorbent cotton absorption downmix agent III, (consumption of downmix agent III is for injecting CO
24% of quality), the effect of absorbent cotton is at injection CO
2process in make downmix agent III be dissolved in CO
2in and be carried in tubule.Injected gas is filled to the pipeline of thin tube model inlet valve.Regulate displacing gases pressure higher than more than experimental pressure 0.5MPa, after pressure stabilisation, record the initial reading of pump under this pressure;
Under experimental temperature, experimental pressure and constant injection rate, promote the middle CO of piston with high pressure constant voltage constant speed pump with the displacement velocity of 0.4mL/min
2gas enters thin tube model and carries out oil displacement experiment.Often inject 0.1PV-0.2PVCO
2, record pump reading, injection pressure and back pressure change, observe state and the color change of fluid in high pressure visable window simultaneously.When regulating displacement velocity to be 0.8mL/min after breakthrough of gas, make CO
2the recovery ratio of displace crude oil reaches maximum value under a predetermined, until the CO injected
2when reaching 1.2PV or do not have oil phase to flow out, terminate displacement test.
In order to utilize CO at slim tube driving test Accurate Determining 70 DEG C
2displacement of reservoir oil minimum miscibility pressure, more than in-place oil saturation pressure, choose 5-6 experimental pressure (needed for namely above-mentioned experiment pressure) in experimentation carry out slim tube driving test respectively, in these displacement pressure points, two points must be had on miscible pressure, separately have two points under miscible pressure.Have employed two high pressure constant voltage constant speed pumps in experimentation, one of them is constant speed mode, is used for displace crude oil, and another one connects the buffer container of back-pressure valve, make instant pressure-responsive by monitoring the pressure change of back-pressure valve, thus make tubule inlet port pressure keep constant.
Experimentally gathered data, CO under calculating different pressures condition
2the oil displacement efficiency of displacement of reservoir oil slim-tube test, and by regression fit curve, the pressure that intersection point is corresponding is minimum miscibility pressure.
Fig. 6 and Fig. 7 is the CO not adding downmix agent III in the present embodiment at 70 DEG C respectively
2the CO of displacement of reservoir oil slim-tube test recovery ratio and interpolation downmix agent III
2the relation curve of displacement of reservoir oil slim-tube test recovery ratio and experimental pressure.As can be seen from Fig. 6 and Fig. 7, do not add the CO of downmix agent III
2be 27.9MPa with the minimum miscibility pressure of east, Ji crude oil, and add the CO of downmix agent III
2be 22.5MPa with the minimum miscibility pressure of east, Ji crude oil, minimum miscibility pressure reduces amplitude and reaches 19.35%, illustrates that the method for the present embodiment can be used in reduction carbon dioxide drive minimum miscibility pressure.
Therefore the method for reduction carbon dioxide drive minimum miscibility pressure of the present invention effectively can reduce CO
2displacement of reservoir oil minimum miscibility pressure, and downmix agent consumption used is few, cost is low, has promotional value, is CO
2strong technical support is provided at the recycling of petroleum industry.
Claims (4)
1. reduce a method for carbon dioxide drive minimum miscibility pressure, it is at CO
2during the miscible displacement of reservoir, downmix agent is dissolved in CO
2in, with CO
2inject stratum simultaneously, and mix with the crude oil in stratum;
Wherein, described downmix agent comprises the combination of one or more in methyl alcohol, ethanol, ethylene glycol, propyl alcohol, ethylenediamine and butanols.
2. the method for reduction carbon dioxide drive minimum miscibility pressure according to claim 1, is characterized in that: the consumption of described downmix agent is CO
2the 1%-4% of quality.
3. the method for reduction carbon dioxide drive minimum miscibility pressure according to claim 1 and 2, is characterized in that: at CO
2during the miscible displacement of reservoir, CO
2minimum injection pressure be 7MPa.
4. the method for the reduction carbon dioxide drive minimum miscibility pressure according to any one of claims 1 to 3, is characterized in that: the temperature of the crude oil in described stratum is 50-120 DEG C.
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| CN106437640A (en) * | 2016-10-19 | 2017-02-22 | 中国石油化工股份有限公司 | Low-permeability reservoir CO2 and N2 mixed oil displacement method |
| CN109142683A (en) * | 2018-09-19 | 2019-01-04 | 中国海洋石油集团有限公司 | A kind of displacement test device and experimental method |
| CN110552671A (en) * | 2019-09-09 | 2019-12-10 | 中国石油大学(华东) | Method for realizing high-efficiency development of heavy oil reservoir by utilizing dimethyl ether to assist CO 2 flooding |
| CN112065340A (en) * | 2020-08-25 | 2020-12-11 | 中国石油大学(华东) | Carbon dioxide displacement of reservoir oil miscible phase experimental apparatus for oil and gas field development |
| 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 |
| CN112228022A (en) * | 2019-07-15 | 2021-01-15 | 中国石油化工股份有限公司 | Reduction of CO2Method for minimum miscible pressure of crude oil and CO2Oil displacement method |
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| CN110552671A (en) * | 2019-09-09 | 2019-12-10 | 中国石油大学(华东) | Method for realizing high-efficiency development of heavy oil reservoir by utilizing dimethyl ether to assist CO 2 flooding |
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