CN108071391B - A kind of foam oil oil reservoir is cold to be adopted later period waste natural gas-propane mixed solvent and handles up experimental method - Google Patents

A kind of foam oil oil reservoir is cold to be adopted later period waste natural gas-propane mixed solvent and handles up experimental method Download PDF

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CN108071391B
CN108071391B CN201810018821.6A CN201810018821A CN108071391B CN 108071391 B CN108071391 B CN 108071391B CN 201810018821 A CN201810018821 A CN 201810018821A CN 108071391 B CN108071391 B CN 108071391B
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CN108071391A (en
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孙晓飞
张艳玉
赵豪
刘云龙
宋兆尧
陈广鹏
王长法
高泽宇
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China University of Petroleum East China
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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
    • E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
    • 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
    • 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
    • E21B43/166—Injecting a gaseous medium; Injecting a gaseous medium and a liquid medium
    • E21B43/168—Injecting a gaseous medium
    • 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
    • E21B47/00—Survey of boreholes or wells
    • E21B47/06—Measuring temperature or pressure

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  • Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
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Abstract

The present invention provides a kind of cold later period waste natural gas-propane mixed solvent of adopting of foam oil oil reservoir and handles up experimental method.The present invention is mixed to form solvent using the waste natural gas and propane of output during cold adopt, it is injected by way of handling up and cold adopts later period foam oil oil reservoir, form secondary foam oil, oil recovery can be improved, the processing cost of waste natural gas and the use cost of propane can be greatly lowered again, wide at low cost, gas source, environmental protection advantage, to solve the problems, such as foam oil oil reservoir, cold to adopt exploitation recovery ratio not high, seriously polluted.Furthermore natural gas and propane mixed solvent can be gaseous state and liquid in the present invention, the factor can be utilized according to the economic factors combination solvent such as oil price, easily and fast preferred natural gas and propane mixed solvent composition and phase have stronger adaptability to the complex environment that violent oil price changes.

Description

A kind of foam oil oil reservoir is cold to be adopted later period waste natural gas-propane mixed solvent and handles up reality Proved recipe method
Technical field
The present invention relates to a kind of cold later period waste natural gas-propane mixed solvents of adopting of foam oil oil reservoir to handle up experimental method, Belong to exploitation technology of heavy reservoir field.
Background technique
Xinjiang, China spits the regional viscous crude resource ten such as Kazakhstan and the Venezuela's Orinoco heavy oil belt abroad developed cooperatively Divide and enrich, part heavy crude reservoir is cold to adopt the production feature shown in the process different from conventional dissolved gas drive, is mainly manifested in following Three aspects: 1. continuous foam state is presented in oil reservoir output oil, contains a large amount of stable bubbles in crude oil.2. oil reservoir produces gas and oil It is slower than the rate of climb.3. oil recovery and rate of oil production it is higher (more conventional dissolved gas drive reservoir recovery ratio is higher by 5-25%, Rate of oil production is higher by 10-30 times, and some is even as high as 100 times).The reason of above-mentioned phenomenon occurs is strata pressure lower than bubble point When pressure, since viscous crude viscous force is greater than gravity, the solution gas escaped from crude oil is not directly formed continuous gas phase, but It is dispersed in the form of minute bubbles in oily phase and forms foam oil, the presence of foam oil mechanism, which plays, delays production gas-oil ratio liter Height increases substantially the effect of recovery ratio.But with the exploitation of oil reservoir, strata pressure is further decreased, stingy in foam oil Gradually aggregation forms continuous gas phase to bubble, and foam oil phenomenon fades away, so that production gas-oil ratio rapid increase, oil well output are passed Subtract quickening.Meanwhile production gas-oil ratio rising leads to a large amount of waste natural gas of output, so that oil reservoir development, processing cost rise, ring Border pollution aggravates, and therefore, how effectively to supplement stratum energy, extends foam oil action time, improves that foam oil oil reservoir is cold to be adopted Later development effect, reducing gas exhaust emission becomes current the type oil reservoir critical issue urgently to be resolved.
Summary of the invention
Foam oil oil reservoir is cold adopt the later period aiming at the problem that, it is useless that the present invention provides a kind of cold later period natural gas of adopting of foam oil oil reservoir Gas-propane mixed solvent is handled up experimental method.
Since propane compared with gases such as CO2, natural gas, N2 there is stronger viscous crude to dissolve viscosity reduction ability, present invention benefit It is mixed to form solvent with the waste natural gas of output during cold adopt and propane, is injected by way of handling up and cold adopts later period foam Oil reservoir forms secondary foam oil, it can improve oil recovery, and being processed into for waste natural gas can be greatly lowered The use cost of this and propane, at low cost, gas source is wide, the advantage of environmental protection, to solve that foam oil oil reservoir is cold to be adopted exploitation and adopt The problem that yield is not high, exhaust pollution is serious.
Technical scheme is as follows:
A kind of foam oil oil reservoir is cold to be adopted later period waste natural gas-propane mixed solvent and handles up experimental method, and experiment is quasi- early period Standby work: prepare injection formation oil, water flooding and waste natural gas-propane mixed solvent；Prepare one-dimensional rock core displacement device With artificial core, practical foam oil reservoir media is simulated；
The experimental method includes:
1) make the artificial core vacuum state installed in one-dimensional rock core displacement device；Air in artificial core is discharged；
2) preparation simulation foam oil reservoir media: the artificial core is saturated water flooding and formation oil, measures artificial rock Porosity φ, permeability and the initial oil saturation of the heart；
3) foam oil oil reservoir is cold adopts the development phase for simulation: being carried out by one-dimensional rock core displacement device to the artificial core cold Exploitation is adopted, bubble shape is observed, foam oil phenomenon is closed one-dimensional rock core and driven when continuous gas phase occurs, and foam oil phenomenon disappears For the outlet of device, calculate that foam oil oil reservoir is cold to adopt development phase recovery percent of reserves；
4) simulation waste natural gas-propane mixed solvent is handled up injection stage: the people in Xiang Yiwei rock core displacement device The lithogenesis heart injects waste natural gas-propane mixed solvent；
5) simulation waste natural gas-propane mixed solvent is handled up the stewing well stage；Close one-dimensional rock core displacement device import, Outlet；The waste natural gas of injection-propane mixed solvent passes through diffusion under high pressure and is dissolved into viscous crude；Play reduction viscous crude Viscosity provides the effect to form secondary foam oil dispersed bubble；
6) simulation waste natural gas-propane mixed solvent is handled up the production phase: by one-dimensional rock core displacement device to described The viscous crude of artificial core carries out decompression exploitation；The outlet for opening the one-dimensional rock core displacement device, due to waste natural gas-propane The dissolution of mixed solvent, viscosity of thickened oil reduce, volume expansion, and the mixed gas being precipitated is dispersed in viscous crude and forms secondary foam Oily phenomenon.
It is preferred according to the present invention, step 4)~step 6) is repeated several times, carries out multicycle waste natural gas-propane mixing Solvent is handled up process, calculates waste natural gas-propane mixed solvent and handles up recovery percent of reserves and ultimate recovery.
It is preferred according to the present invention, after step 4)~step 6) is repeated several times, calculate the artificial core remaining oil Saturation degree Sro。
It is preferred according to the present invention, the method also includes: it calculates waste natural gas-propane mixed solvent and is commented using the factor Valence waste natural gas-propane mixed solvent is handled up experiment effect.
It is preferred according to the present invention, the method for preparing injection formation oil: is formed according to output gas, utilize actual bubble Foam oil oil reservoir output oil, reservoir pressure and at a temperature of the formation oil containing solution gas that is configured to, for simulating practical oil reservoir In crude oil.
It is preferred according to the present invention, the output oil are as follows: asphalt content is greater than 7wt.%, and acid value is greater than 1.7mgg-1, Viscosity of crude is greater than 5000mPas at 50 DEG C, and generates foam oil phenomenon.
Preferred according to the present invention, the preparations injection is sodium chloride solution with water flooding, concentration for 0.1wt.%~ 0.5wt.%.
It is preferred according to the present invention, the waste natural gas-propane mixed solvent configuration method: the temperature of configuration process For reservoir temperature, propane gas is injected into container at atmosheric pressure, until making on container pressure to propane dew-point pressure Propane liquefaction；Then waste natural gas is injected to container according to actual needs；Last adjustment container pressure reaches actually required note Enter pressure.Different composition propane and natural gas mixed solvent phasor are calculated, are determined according to the temperature of oil reservoir and injection pressure natural Gas exhaust gas-propane mixed solvent is gaseous state or liquid.
Preferred according to the present invention, when waste natural gas-propane mixed solvent is gaseous state, container is in note actually required Enter under pressure and temperature static 24 hours~48 hours；When waste natural gas-propane mixed solvent is there are when liquid, container is in reality The injection pressure that border needs, so that natural gas-propane is thoroughly mixed, reaches balance static 12 hours~24 hours at a temperature of.
Preferred according to the present invention, in the step 2), the material of the artificial core is matched are as follows: quartz sand, quartz sand Cementing agent and alcohol；
Quartz sand particle size size used is 40~100 mesh；
The quartz sand adhesive is epoxy resin；
The quartz sand, epoxy resin and alcohol quality ratio are 40:1:1~50:5:1.The material and match that the present invention selects Artificial core than being prepared into can effectively simulate foam oil oil reservoir loose sand feature.
It is preferred according to the present invention, in the step 1), keep the artificial core installed in one-dimensional rock core displacement device true The method of dummy status are as follows: it is 24~48 hours to the time that one-dimensional rock core displacement device vacuumizes, vacuum pump speed of exhaust 2m3/h ~5m3/ h, 2~4Pa of ultimate vacuum.
It is preferred according to the present invention, in the step 2), by the method for artificial core saturation water flooding and formation oil And step are as follows:
The entrance for 2-1) opening the one-dimensional rock core displacement device, sucks water flooding, when pressure is by bearing under vacuum conditions It is changed to injection water flooding when crimping nearly atmospheric pressure, opens the outlet of one-dimensional rock core displacement device later, after water breakthrough, according to water flooding Soakage and injection rate, calculate artificial core porosity φ；
The inlet pressure for 2-2) measuring one-dimensional rock core displacement device changes injection stratum water speed, according to Darcy's law meter Calculate the artificial core permeability under different injection stratum water speeds；The average value of core permeability is most under difference injection water speed Whole core permeability value；
Back-pressure valve 2-3) is utilized, from the entrance of one-dimensional rock core displacement device injection water flooding up to artificial core pressure is in institute It simulates on foam oil reservoir formation pressure, to prevent formation oil from deaerating；
Formation oil 2-4) is injected from the entrance of the one-dimensional rock core displacement device, when injection stratum oil volume is artificial core 2-3 times of pore volume, and the outlet output oil gas-oil ratio of one-dimensional rock core displacement device be equal to formation oil gas-oil ratio when, close one Tie up the outlet of rock core displacement device；Artificial core initial oil saturation is calculated according to saturation stratum oil quality m.
Preferred according to the present invention, in the step 2), injection water flooding velocity interval is 10ml/min~20ml/min, The velocity interval for injecting formation oil is 0.5ml/min~1.5ml/min.
Preferred according to the present invention, in the step 3), simulation foam oil oil reservoir is cold to adopt the development phase method particularly includes:
One-dimensional rock core displacement device outlet 3-1) is opened, one-dimensional rock core displacement is reduced with the pressure decay rate of 0.6~3MPa/h Device and high-temperature high-pressure visual window pressure；The high-temperature high-pressure visual window and the outlet of one-dimensional rock core displacement device connect；
The formation of bubble shape and foam oil under reservoir temperature and pressure 3-2) is observed by high-temperature high-pressure visual window Journey: when continuous gas phase occurs, and foam oil phenomenon disappears, one-dimensional rock core displacement device outlet is closed, foam oil oil reservoir is cold to be adopted out The hair stage terminates；
3-3) it is calculated by the following formula that foam oil oil reservoir is cold to adopt development phase average pressure PIt is cold to adopt averagely, pressure difference PIt is cold to adopt pressure difference, gas Oil ratio GIt is cold to adoptWith recovery percent of reserves RIt is cold to adopt:
pIt is cold to adopt pressure difference=pIt is cold to adopt entrance-pCold extraction mouth (1)
In formula, pIt is cold to adopt entrance、pCold extraction mouthAnd pIt is cold to adopt jRespectively foam oil oil reservoir is cold adopts stage one-dimensional rock core displacement device portal pressure Power, outlet pressure and the one-dimensional rock core displacement fill j-th of the pressure tap pressure centered, MPa；VIt is cold to adoptFor foam oil oil reservoir It is cold to adopt stage gas production, cm3；mIt is cold to adoptStage oil production, g are adopted for foam oil oil reservoir is cold；ρIt is cold to adoptStage production is adopted for foam oil oil reservoir is cold Oil density out, g/cm3, m is that artificial core is saturated stratum oil quality, g.
Preferred according to the present invention, in the step 4), injection waste natural gas-propane mixed solvent method includes:
The outlet for 4-1) opening one-dimensional rock core displacement device, injects waste natural gas-propane mixed solvent, and injection pressure is big The outlet of one-dimensional rock core displacement device is closed when the outlet pressure of one-dimensional rock core displacement device is equal to injection pressure in 4MPa；
Time, the inlet pressure of one-dimensional rock core displacement device, outlet pressure and each pressure tap 4-2) are recorded in the above process Pressure；
4-3) first is calculated according to mixed gas state equation to handle up period gas injection rate VNote 1:
In formula (5), PInitial 1For period 1 waste natural gas-propane mixed solvent container initial pressure, MPa；VInitial 1It is One period mixed solvent container initial volume, cm3；ZInitial 1For period 1 waste natural gas-propane mixed solvent original state pressure The contracting factor, PTerminate 1Waste natural gas-propane mixed solvent container pressure, MPa after for the period 1；VTerminate 1For the period 1 After waste natural gas-propane mixed solvent container volume, cm3；ZTerminate 1It is molten for period 1 waste natural gas-propane mixing Agent terminates state compressibility factor, P0For atmospheric pressure, MPa.
Preferred according to the present invention, in the step 5), the simulation waste natural gas-propane mixed solvent is handled up stewing well The method in stage includes:
Import, the outlet of one-dimensional rock core displacement device are closed, the record time, goes out one-dimensional rock core displacement device portal pressure Mouth pressure and each pressure tap pressure.
Preferred according to the present invention, the time in the stewing well stage is 12~24 hours.If the stewing well time is too short, naturally Gas exhaust gas-propane mixed solvent is unable to fully be dissolved in crude oil, boils in a covered pot over a slow fire well overlong time, the too low influence production of rate of dissolution.
Preferred according to the present invention, in the step 6), simulation waste natural gas-propane mixed solvent is handled up the production phase Specific steps include:
The outlet of one-dimensional rock core displacement device is opened, the one-dimensional rock core is reduced with the pressure drop rate of 0.6~3MPa/h and is driven For pressure in device, in order to guarantee that this period has preferable development effectiveness and rock core pressure with higher of subsequent period of handling up Power closes the outlet of one-dimensional rock core displacement device when pressure is down to 1~2MPa, and the production phase terminates；
Secondary foam oil is observed by video camera and high temperature and pressure observation window in the above process and generates situation, and by following Formula calculates waste natural gas-propane mixed solvent and handles up period 1 average pressure PHandle up average 1, pressure difference PIt handles up pressure difference 1, gas-oil ratio GHandle up 1With recovery percent of reserves RHandle up 1:
pIt handles up pressure difference 1=pIt handles up entrance 1-pIt handles up outlet 1 (6)
In formula (6)-(9), pIt handles up entrance 1、pIt handles up outlet 1And pHandle up 1jRespectively first handles up period one-dimensional rock core displacement device portal Pressure, outlet pressure and j-th of pressure tap pressure, MPa；VHandle up 1It handles up period gas production for first, cm3；mHandle up 1It handles up for first Period oil production, g；ρHandle up 1It handles up period output oil density for first, g/cm3。
It is preferred according to the present invention, step 4)~step 6) is repeated several times, carries out multicycle waste natural gas-propane mixing Solvent is handled up process, calculates waste natural gas-propane mixed solvent and handles up recovery percent of reserves and ultimate recovery, including step is such as Under:
According to oil field development cost and oil price, the standard for testing end be handle up terminate recovery percent of reserves 1%~5% it Between.As the recovery percent of reserves R in i-th of periodHandle up iLess than handle up terminate recovery percent of reserves when, waste natural gas-propane mixed solvent gulps down It spits and improves the disappearance of recovery ratio effect, experiment terminates；
Record time, the oil production m in period of respectively handling upHandle up i, gas production, the entrance of one-dimensional rock core displacement device, one-dimensional rock The outlet of heart driving device and each pressure tap pressure observe secondary foam oil by high temperature and pressure observation window and generate situation；It is logical It crosses following formula and calculates the period recovery percent of reserves R that respectively handles upHandle up i, calculate waste natural gas-propane mixed solvent and handle up recovery percent of reserves RIt handles upAnd ultimate recovery R:
R=RIt is cold to adopt+RIt handles up (11)。
It is preferred according to the present invention, after step 4)~step 6) is repeated several times, calculate the artificial core remaining oil Saturation degree SroMethod include:
Artificial core is successively taken out from one-dimensional rock core displacement device, measures artificial core W containing oil qualityo, artificial core Quality Ws, last period handles up output oil density ρo, quartz sand density ps, it is calculate by the following formula rock core remaining oil saturation Sro:
It determines the distance that every piece of rock core center is exported to one-dimensional rock core displacement device, draws distance and rock core remaining oil Saturation degree SroRelational graph obtains one-dimensional rock core displacement device remaining oil saturation distribution map.
It is preferred according to the present invention, it calculates waste natural gas-propane mixed solvent and utilizes factor evaluation waste natural gas-the third Alkane mixed solvent is handled up the specific method of experiment effect:
Waste natural gas-propane mixed solvent is evaluated using factor GUF by calculating waste natural gas-propane mixed solvent It handles up economic benefit, waste natural gas-propane mixed solvent is calculated using factor GUF by following formula:
A is waste natural gas-propane mixed solvent usage factor in formula (13), (14)；mHandle up iIt handles up period oil-producing for i-th Amount,To inject waste natural gas volume,To inject propane volume, x is injection in the mixed solvent day The molar fraction of right gas；Y is the molar fraction for injecting in the mixed solvent propane.Since natural gas is exhaust gas, mixed solvent is infused Cost mostlys come from propane, and b is propane and Gas Prices ratio, b=2 to 8；VInfuse iIt handles up period gas injection rate for i-th, cm3；VIt adopts For the cumulative gas production in each period in the stage of handling up, cm3。
The present invention has the beneficial effect that:
1, the present invention by foam oil oil reservoir is cold adopt during output waste natural gas and propane be mixed to form solvent, pass through The mode handled up injects oil reservoir, forms secondary foam oil, it can improve oil recovery, and natural gas can be greatly lowered The processing cost of exhaust gas and the use cost of propane, with advantage at low cost, that gas source is wide, environmentally friendly, to solve foam oil oil It hides cold adopt and develops not high, the seriously polluted problem of recovery ratio, for cold later period foam oil oil reservoir development of adopting with biggish application Prospect.
2, waste natural gas and propane mixed solvent can be gaseous state and liquid, gaseous state mixed solvent cost in the present invention Low, propane dosage is few, and it is strong that liquid mixed solvent dissolves viscosity reduction ability.Can according to the economic factors combination solvent such as oil price utilize because Son, easily and fast preferred natural gas and propane mixed solvent form, and determine mixed solvent state.
Detailed description of the invention
Fig. 1 is waste natural gas and propane mixed solvent phasor in embodiment 1 and embodiment 14；
Fig. 2, which is that 4 foam oil oil reservoir of embodiment is cold, adopts stage average pressure PIt is cold to adopt averagely, pressure difference PIt is cold to adopt pressure difference, gas-oil ratio GIt is cold to adoptAnd extraction Degree RIt is cold to adopt；
Fig. 3 is the one-dimensional rock core displacement device portal pressure of 5 injection stage of embodiment, outlet pressure and each pressure tap pressure；
Fig. 4 is that embodiment 6 boils in a covered pot over a slow fire well stage one-dimensional rock core displacement device portal pressure, outlet pressure and each pressure tap pressure；
Fig. 5 be embodiment 7 first handle up production phase in period secondary foam oil generate situation map；
Fig. 6 is that embodiment 7 first is handled up period average pressure PHandle up average 1, pressure difference PIt handles up pressure difference 1, gas-oil ratio GHandle up 1And recovery percent of reserves RHandle up 1；
Fig. 7 is that gas-oil ratio and recovery ratio change over time figure in embodiment 1,14；
Fig. 8 is entrance, outlet and each pressure tap pressure that one-dimensional rock core body described in embodiment 11 replaces device；
Fig. 9, which handles up for embodiment 12,14 with single natural gas, to be compared, the full degree distribution map of the remaining oil；
Figure 10 is 14 average pressure P of embodimentIt is cold to adopt averagely, pressure difference PIt is cold to adopt pressure difference, gas-oil ratio GIt is cold to adoptWith recovery percent of reserves RIt is cold to adopt；
Figure 11 is the one-dimensional rock core displacement device portal pressure of 14 injection stage of embodiment, outlet pressure and each pressure tap pressure Power；
Figure 12 is that embodiment 14 boils in a covered pot over a slow fire well stage one-dimensional rock core displacement device portal pressure, outlet pressure and each pressure tap pressure Power；
Figure 13 be embodiment 14 first handle up production phase in period secondary foam oil generate situation map；
Figure 14 first is handled up period average pressure P described in embodiment 14Handle up average 1, pressure difference PIt handles up pressure difference 1, gas-oil ratio GHandle up 1With adopt Degree R outHandle up 1；
Figure 15 is entrance, outlet and each pressure tap pressure that one-dimensional rock core body described in embodiment 14 replaces device；
Figure 16 be embodiment 14 the 5th handle up production phase in period secondary foam oil generate situation map.
Specific embodiment
The present invention is described in detail below with reference to example and Figure of description, but not limited to this.
Embodiment 1,
A kind of foam oil oil reservoir is cold to be adopted later period waste natural gas-propane mixed solvent and handles up experimental method, and experiment is quasi- early period Standby work: prepare injection formation oil, water flooding and waste natural gas-propane mixed solvent；Prepare one-dimensional rock core displacement device With artificial core, practical foam oil oil reservoir is simulated；
The experimental method includes:
1) make the artificial core vacuum state installed in one-dimensional rock core displacement device；Air in artificial core is discharged；
Make the method for the artificial core vacuum state installed in one-dimensional rock core displacement device are as follows: fill to one-dimensional rock core displacement Setting the time vacuumized is 24~48 hours, vacuum pump speed of exhaust 2m3/ h~5m3/ h, 2~4Pa of ultimate vacuum.
2) preparation simulation foam oil reservoir media: the artificial core is saturated water flooding and formation oil, measures artificial rock Porosity φ, permeability and the initial oil saturation of the heart；
The method for preparing injection formation oil: forming according to output gas, oily using practical foam oil oil reservoir output, The formation oil containing solution gas that reservoir pressure is configured to at a temperature of, for simulating the crude oil in practical oil reservoir.
The output oil are as follows: asphalt content is greater than 7wt.%, and acid value is greater than 1.7mgg-1, viscosity of crude is big at 50 DEG C In 5000mPas, and generate foam oil phenomenon.In the present embodiment, output gas is mainly organized as methane and carbon dioxide, mole Than for 8:1, therefore, output gas is configured according to aforementioned proportion, and mixed with Venezuela foam oil oil reservoir output oil, in oil reservoir pressure Power (8.65MPa and 54.2 DEG C) at a temperature of is configured to the formation oil containing solution gas, and formation oil gas-oil ratio is 15m3/m3.In committee Auspicious drawing foam oil oil reservoir output oil asphalt matter content is 7.78wt.%, acid value 4.95mgg-1, viscosity of crude is at 50 DEG C 24715mPas, field observation find that the output oil can generate foam oil phenomenon；
The preparation injection is sodium chloride solution with water flooding, and concentration is 0.1wt.%~0.5wt.%.The present embodiment In, sodium chloride is dissolved in distilled water and is prepared into practice ground layer water, concentration of sodium chloride solution 0.5wt.%；
The material of the artificial core matches are as follows: quartz sand, quartzy sand adhesive and alcohol；
Quartz sand particle size size used is 40~100 mesh；
The quartz sand adhesive is epoxy resin；
The quartz sand, epoxy resin and alcohol quality ratio are 40:1:1~50:5:1.The material and match that the present invention selects Artificial core than being prepared into can effectively simulate foam oil oil reservoir loose sand feature.
3) foam oil oil reservoir is cold adopts the development phase for simulation: being carried out by one-dimensional rock core displacement device to the artificial core cold Exploitation is adopted, bubble shape is observed, foam oil phenomenon is closed one-dimensional rock core and driven when continuous gas phase occurs, and foam oil phenomenon disappears For the outlet of device, calculate that foam oil oil reservoir is cold to adopt development phase recovery percent of reserves；Such as following formula (4)；
4) simulation waste natural gas-propane mixed solvent is handled up injection stage: the people in Xiang Yiwei rock core displacement device The lithogenesis heart injects waste natural gas-propane mixed solvent；
The waste natural gas-propane mixed solvent configuration method: the temperature of configuration process is reservoir temperature, in atmosphere Propane gas is injected under pressure into container, until making propane liquefy on container pressure to propane dew-point pressure；Then basis It is actually needed to container and injects waste natural gas；Last adjustment container pressure reaches actually required injection pressure.Calculate different groups At propane and natural gas mixed solvent phasor, determine that waste natural gas-propane mixing is molten according to the temperature of oil reservoir and injection pressure Agent is gaseous state or liquid.
When waste natural gas-propane mixed solvent be gaseous state when, container injection pressure actually required and at a temperature of it is quiet Only 24 hours~48 hours；When waste natural gas-propane mixed solvent is there are when liquid, container is in injection pressure actually required Static 12 hours~24 hours at a temperature of, so that waste natural gas-propane is thoroughly mixed, reach balance.In the present embodiment, day Right gas exhaust gas-propane in the mixed solvent waste natural gas-propane molar ratio is 72:28, calculates waste natural gas and propane mixing Solvent phasor is as shown in Figure 1, determine that mixed solvent state is gaseous state according to the temperature of oil reservoir and injection pressure.Container is needed in experiment The injection pressure wanted, so that waste natural gas-propane is thoroughly mixed, reaches balance static 48 hours at a temperature of；
5) simulation waste natural gas-propane mixed solvent handle up the stewing well stage: close one-dimensional rock core displacement device import, Outlet；The waste natural gas of injection-propane mixed solvent passes through diffusion under high pressure and is dissolved into viscous crude；Play reduction viscous crude Viscosity provides the effect to form secondary foam oil dispersed bubble；
6) simulation waste natural gas-propane mixed solvent is handled up the production phase: by one-dimensional rock core displacement device to described The viscous crude of artificial core carries out decompression exploitation；The outlet for opening the one-dimensional rock core displacement device, due to waste natural gas-propane The dissolution of mixed solvent, viscosity of thickened oil reduce, volume expansion, and the mixed gas being precipitated is dispersed in viscous crude and forms secondary foam Oily phenomenon.
Embodiment 2,
A kind of foam oil oil reservoir as described in Example 1 is cold to be adopted later period waste natural gas-propane mixed solvent and handles up experiment Method, difference is, in the step 2), by the method and steps of artificial core saturation water flooding and formation oil are as follows:
The entrance for 2-1) opening the one-dimensional rock core displacement device, sucks water flooding, when pressure is by bearing under vacuum conditions It is changed to injection water flooding when crimping nearly atmospheric pressure, opens the outlet of one-dimensional rock core displacement device later, after water breakthrough, according to water flooding Soakage and injection rate, calculate artificial core porosity φ；
In the present embodiment, the one-dimensional rock core displacement device portal is opened, water flooding is sucked under vacuum conditions, works as pressure Injection water flooding is changed to when by negative pressure close to atmospheric pressure, calculating artificial core porosity φ is 40.55%.
The inlet pressure for 2-2) measuring one-dimensional rock core displacement device changes injection stratum water speed, according to Darcy's law meter Calculate the artificial core permeability under different injection stratum water speeds；The average value of core permeability is most under difference injection water speed Whole core permeability value；
In the present embodiment, pressure meter accuracy is 0.01MPa, and injection stratum water speed is respectively 10cm3/min、20cm3/ min、30cm3/ min, measurement core permeability is respectively 33.65 μm3、33.70μm3、33.75μm3, final core permeability value It is 33.70 μm3。
Back-pressure valve 2-3) is utilized, from the entrance of one-dimensional rock core displacement device injection water flooding up to artificial core pressure is in institute It simulates on foam oil reservoir formation pressure, to prevent formation oil from deaerating；
In the present embodiment, water flooding is injected up to rock core pressure is 10MPa, higher than institute from one-dimensional rock core displacement device portal Foam oil reservoir formation pressure 8.65MPa is simulated, to guarantee that formation oil does not deaerate.
Formation oil 2-4) is injected from the entrance of the one-dimensional rock core displacement device, when injection stratum oil volume is artificial core 2-3 times of pore volume, and the outlet output oil gas-oil ratio of one-dimensional rock core displacement device be equal to formation oil gas-oil ratio when, close one Tie up the outlet of rock core displacement device；Artificial core initial oil saturation is calculated according to saturation stratum oil quality m.
In the present embodiment, when injection stratum oil volume is 2 times of rock pore volume, and one-dimensional rock core displacement device is exported Output oil gas-oil ratio is equal to formation oil gas-oil ratio 15m3/m3When, close one-dimensional rock core displacement device outlet.According to saturation formation oil It is 87.44% that quality m, which calculates rock core initial oil saturation,
Embodiment 3,
A kind of foam oil oil reservoir as described in Example 2 is cold to be adopted later period waste natural gas-propane mixed solvent and handles up experiment Method, difference is, in the step 2), injection water flooding velocity interval is 10ml/min~20ml/min, injects stratum The velocity interval of oil is 0.5ml/min~1.5ml/min.In the present embodiment, injection stratum water speed is 20ml/min, injection ground The speed of layer oil is 1.0ml/min.
Embodiment 4,
A kind of foam oil oil reservoir as described in Example 1 is cold to be adopted later period waste natural gas-propane mixed solvent and handles up experiment Method, difference is, in the step 3), simulation foam oil oil reservoir is cold to adopt the development phase method particularly includes:
One-dimensional rock core displacement device outlet 3-1) is opened, one-dimensional rock core displacement is reduced with the pressure decay rate of 0.6~3MPa/h Device and high-temperature high-pressure visual window pressure；The high-temperature high-pressure visual window and the outlet of one-dimensional rock core displacement device connect；This reality It applies in example, opens one-dimensional rock core displacement device outlet, one-dimensional rock core displacement device and high temperature are reduced with the pressure decay rate of 3MPa/h High pressure visable window pressure.
The formation of bubble shape and foam oil under reservoir temperature and pressure 3-2) is observed by high-temperature high-pressure visual window Journey: when continuous gas phase occurs, and foam oil phenomenon disappears, one-dimensional rock core displacement device outlet is closed, foam oil oil reservoir is cold to be adopted out The hair stage terminates；
3-3) it is calculated by the following formula that foam oil oil reservoir is cold to adopt development phase average pressure PIt is cold to adopt averagely, pressure difference PIt is cold to adopt pressure difference, gas Oil ratio GIt is cold to adoptWith recovery percent of reserves RIt is cold to adopt:
pIt is cold to adopt pressure difference=pIt is cold to adopt entrance-pCold extraction mouth (1)
In formula, pIt is cold to adopt entrance、pCold extraction mouthAnd pIt is cold to adopt jRespectively foam oil oil reservoir is cold adopts stage one-dimensional rock core displacement device portal pressure Power, outlet pressure and the one-dimensional rock core displacement fill j-th of the pressure tap pressure centered, MPa；VIt is cold to adoptFor foam oil oil reservoir It is cold to adopt stage gas production, cm3；mIt is cold to adoptStage oil production, g are adopted for foam oil oil reservoir is cold；ρIt is cold to adoptStage production is adopted for foam oil oil reservoir is cold Oil density out, g/cm3, m is that artificial core is saturated stratum oil quality, g.In the present embodiment, totally 4 surveys of one-dimensional rock core displacement device Pressure point, therefore, j=4.Average pressure P is calculated according to formula (1)~formula (4)It is cold to adopt averagely, cold adopt pressure difference PIt is cold to adopt pressure difference, gas-oil ratio GIt is cold to adopt With recovery percent of reserves RIt is cold to adoptAs shown in Figure 2.As shown in Figure 2, with the progress of experiment, foam oil oil reservoir average pressure PIt is cold to adopt averagelyGradually drop It is low, but cold adopt pressure difference PIt is cold to adopt pressure differenceIt gradually increases, so that recovery percent of reserves RIt is cold to adoptIt gradually increases.Gas-oil ratio GIt is cold to adoptFirst increase, after due to bubble The formation of foam oil decreases, and the later period with the disappearance of foam oil phenomenon, and gradually increases.
Embodiment 5,
A kind of foam oil oil reservoir as described in Example 1 is cold to be adopted later period waste natural gas-propane mixed solvent and handles up experiment Method, difference is, in the step 4), injection waste natural gas-propane mixed solvent method includes:
The outlet for 4-1) opening one-dimensional rock core displacement device, injects waste natural gas-propane mixed solvent, and injection pressure is big The outlet of one-dimensional rock core displacement device is closed when the outlet pressure of one-dimensional rock core displacement device is equal to injection pressure in 4MPa；
Time, the inlet pressure of one-dimensional rock core displacement device, outlet pressure and each pressure tap 4-2) are recorded in the above process Pressure；
4-3) first is calculated according to mixed gas state equation to handle up period gas injection rate VNote 1:
In formula (5), PInitial 1For period 1 waste natural gas-propane mixed solvent container initial pressure, MPa；VInitial 1For The container initial volume of period 1 mixed solvent, cm3；ZInitial 1For period 1 waste natural gas-propane mixed solvent initial shape State compressibility factor, PTerminate 1Waste natural gas-propane mixed solvent container pressure, MPa after for the period 1；VTerminate 1It is Waste natural gas-propane mixed solvent container volume, cm after one end cycle3；ZTerminate 1For period 1 waste natural gas-the third Alkane mixed solvent terminates state compressibility factor, P0For atmospheric pressure, MPa.
In the present embodiment, one-dimensional rock core displacement device outlet is opened, waste natural gas-propane mixed solvent, injection are injected Pressure is 6MPa, when one-dimensional rock core displacement device outlet pressure is equal to injection pressure 6MPa, closes one-dimensional rock core displacement device Outlet.Time, one-dimensional rock core displacement device portal pressure, outlet pressure and each pressure tap pressure such as Fig. 3 are recorded in the above process It is shown.Later, first is calculated according to mixed gas state equation (formula 5) handle up period gas injection rate for 3800cm3.It can by Fig. 3 Know, with the progress of experiment, entrance, outlet and each measuring point pressure are gradually increased to injection pressure, and wherein outlet pressure is at any time The rate of climb is most fast, and the rate of climb is most slow at any time for inlet pressure.
Embodiment 6,
A kind of foam oil oil reservoir as described in Example 1 is cold to be adopted later period waste natural gas-propane mixed solvent and handles up experiment Method, difference is, in the step 5), the simulation waste natural gas-propane mixed solvent is handled up the side in stewing well stage Method includes:
Import, the outlet of one-dimensional rock core displacement device are closed, the record time, goes out one-dimensional rock core displacement device portal pressure Mouth pressure and each pressure tap pressure.
The time in the stewing well stage is 12~24 hours.If the stewing well time is too short, waste natural gas-propane mixing is molten Agent is unable to fully be dissolved in crude oil, boils in a covered pot over a slow fire well overlong time, the too low influence production of rate of dissolution.
In the present embodiment, one-dimensional rock core displacement device import, outlet are closed.Record time, one-dimensional rock core displacement device enter Mouth pressure, outlet pressure and each pressure tap pressure are as shown in Figure 4.As shown in Figure 4, with the progress of experiment, each pressure gradually drops It is low, show that mixed solvent is gradually dissolved in crude oil, when the stewing well time being 20 small 31 minutes, pressure decrease speed is lower, table Bright rate of dissolution is lower, therefore the stewing well stage terminates.
Embodiment 7,
A kind of foam oil oil reservoir as described in Example 1 is cold to be adopted later period waste natural gas-propane mixed solvent and handles up experiment Method, difference is, in the step 6), simulation waste natural gas-propane mixed solvent is handled up the specific step of production phase Suddenly include:
The outlet of one-dimensional rock core displacement device is opened, the one-dimensional rock core is reduced with the pressure drop rate of 0.6~3MPa/h and is driven For pressure in device, in order to guarantee that this period has preferable development effectiveness and rock core pressure with higher of subsequent period of handling up Power closes the outlet of one-dimensional rock core displacement device when pressure is down to 1~2MPa, and the production phase terminates；
Secondary foam oil is observed by video camera and high temperature and pressure observation window in the above process and generates situation, and by following Formula calculates waste natural gas-propane mixed solvent and handles up period 1 average pressure PHandle up average 1, pressure difference PIt handles up pressure difference 1, gas-oil ratio GHandle up 1With recovery percent of reserves RHandle up 1:
pIt handles up pressure difference 1=pIt handles up entrance 1-pIt handles up outlet 1 (6)
In formula (6)-(9), pIt handles up entrance 1、pIt handles up outlet 1And pHandle up 1jRespectively first handles up period one-dimensional rock core displacement device portal Pressure, outlet pressure and j-th of pressure tap pressure, MPa；VHandle up 1It handles up period gas production for first, cm3；mHandle up 1It handles up for first Period oil production, g；ρHandle up 1It handles up period output oil density for first, g/cm3.In the present embodiment, one-dimensional rock core displacement dress is opened Set outlet, pressure in the one-dimensional rock core displacement device reduced with the pressure drop rate of 3MPa/h, in order to guarantee this period have compared with Good development effectiveness and rock core pressure with higher of subsequent period of handling up closes outlet when pressure is down to 1MPa, produces rank Section terminates.Secondary foam oil is observed by video camera and high temperature and pressure observation window in the above process and generates situation as shown in figure 5, meter First is calculated to handle up period average pressure PHandle up average 1, pressure difference PIt handles up pressure difference 1, gas-oil ratio GHandle up 1With recovery percent of reserves RHandle up 1As shown in Figure 6.By scheming 5 it is found that injection waste natural gas-propane mixed solvent after the stage of handling up apparent secondary foam oil phenomenon can be generated, effectively Extend the time of foam oil oil reservoir foam oil phenomenon.It will be appreciated from fig. 6 that first handles up the production phase in period, with experiment into Row, handle up period 1 average pressure PHandle up average 1It gradually decreases, pressure difference PIt handles up pressure difference 1It gradually increases, so that recovery percent of reserves RHandle up 1Gradually Increase.Gas-oil ratio GHandle up 1At the trend gradually increased.
Embodiment 8,
A kind of foam oil oil reservoir as described in Example 1 is cold to be adopted later period waste natural gas-propane mixed solvent and handles up experiment Method, difference are, step 4)~step 6) is repeated several times, and carry out multicycle waste natural gas-propane mixed solvent and handle up Process calculates waste natural gas-propane mixed solvent and handles up recovery percent of reserves and ultimate recovery.Respectively such as following formula (10) and Formula (11).
Embodiment 9,
A kind of foam oil oil reservoir as described in Example 8 is cold to be adopted later period waste natural gas-propane mixed solvent and handles up experiment Method, difference is, after step 4)~step 6) is repeated several times, calculates the artificial core remaining oil saturation Sro。
Embodiment 10,
A kind of foam oil oil reservoir as described in Example 1 is cold to be adopted later period waste natural gas-propane mixed solvent and handles up experiment Method is distinguished and is, the method also includes: it calculates waste natural gas-propane mixed solvent and utilizes factor evaluation natural gas Exhaust gas-propane mixed solvent is handled up experiment effect.
Embodiment 11,
A kind of foam oil oil reservoir as described in Example 8 is cold to be adopted later period waste natural gas-propane mixed solvent and handles up experiment Method, difference are, step 4)~step 6) is repeated several times, and carry out multicycle waste natural gas-propane mixed solvent and handle up Process calculates waste natural gas-propane mixed solvent and handles up recovery percent of reserves and ultimate recovery, comprises the following steps that
According to oil field development cost and oil price, the standard for testing end be handle up terminate recovery percent of reserves 1%~5% it Between, the recovery percent of reserves R in i-th of periodHandle up iLess than handle up terminate recovery percent of reserves when, waste natural gas-propane mixed solvent is handled up It improves recovery ratio effect to disappear, experiment terminates；
Record time, the oil production m in period of respectively handling upHandle up i, gas production, the entrance of one-dimensional rock core displacement device, one-dimensional rock The outlet of heart driving device and each pressure tap pressure observe secondary foam oil by high temperature and pressure observation window and generate situation；It is logical It crosses following formula and calculates the period recovery percent of reserves R that respectively handles upHandle up i, calculate waste natural gas-propane mixed solvent and handle up recovery percent of reserves RIt handles upAnd ultimate recovery R:
R=RIt is cold to adopt+RIt handles up (11)。
In the present embodiment, according to oil field development cost and oil price, the standard for testing end is to handle up to terminate recovery percent of reserves and be 2.5%, the recovery percent of reserves R in third a period of handling upHandle up 3It is 2.22%, terminates recovery percent of reserves 2.5% less than handling up, natural gas is useless Gas-propane mixed solvent, which is handled up, improves the disappearance of recovery ratio effect, and experiment terminates.Record time, the recovery ratio, gas in period of respectively handling up Oil is than as shown in fig. 7, entrance, outlet and each pressure tap pressure are as shown in Figure 8.Calculate waste natural gas-propane mixed solvent Recovery percent of reserves of handling up RIt handles upAnd experiment ultimate recovery R is 18.97% and 31.99%.
As shown in Figure 7, recovery percent of reserves of handling up RIt handles upAnd experiment ultimate recovery R is respectively 18.97% and 31.99%, than list One natural gas, which is handled up, tests recovery percent of reserves and ultimate recovery raising 10.86% and 10.72%, and recovery ratio increases significantly, and can To reduce the gas-oil ratio respectively handled up.As shown in Figure 8, cycle pressure variation tendency of respectively handling up is almost the same.
Embodiment 12,
A kind of foam oil oil reservoir as described in Example 9 is cold to be adopted later period waste natural gas-propane mixed solvent and handles up experiment Method, difference is, after step 4)~step 6) is repeated several times, calculates the artificial core remaining oil saturation Sro's Method includes:
Artificial core is successively taken out from one-dimensional rock core displacement device, measures artificial core W containing oil qualityo, artificial core Quality Ws, last period handles up output oil density ρo, quartz sand density ps, it is calculate by the following formula rock core remaining oil saturation Sro
It determines the distance that every piece of rock core center is exported to one-dimensional rock core displacement device, draws distance and rock core remaining oil Saturation degree SroRelational graph obtains one-dimensional rock core displacement device remaining oil saturation distribution map.In the present embodiment, one-dimensional rock core displacement The full degree distribution map of device remaining oil is as shown in Figure 9.As shown in Figure 9,12 remaining oil saturation of embodiment is natural significantly lower than single Gas is handled up, and shows that embodiment 12 produces more crude oil, foam oil effect of reservoir development increases substantially.
Embodiment 13,
A kind of foam oil oil reservoir as described in Example 10 is cold to be adopted later period waste natural gas-propane mixed solvent and handles up experiment Method, difference are, it is molten using factor evaluation waste natural gas-propane mixing to calculate waste natural gas-propane mixed solvent Agent is handled up the specific method of experiment effect:
Waste natural gas-propane mixed solvent is evaluated using factor GUF by calculating waste natural gas-propane mixed solvent It handles up economic benefit, waste natural gas-propane mixed solvent is calculated using factor GUF by following formula:
A is waste natural gas-propane mixed solvent usage factor in formula (13), (14)；mHandle up iIt handles up period oil-producing for i-th Amount,To inject waste natural gas volume,To inject propane volume, x is injection in the mixed solvent day The molar fraction of right gas；Y is the molar fraction for injecting in the mixed solvent propane.Since natural gas is exhaust gas, mixed solvent is infused Cost mostlys come from propane, and b is propane and Gas Prices ratio, b=2 to 8；VInfuse iIt handles up period gas injection rate for i-th, cm3；VIt adopts For the cumulative gas production in each period in the stage of handling up, cm3.In the present embodiment, a=0.5, b=2, x=0.72, y=0.28.GUF is such as Shown in table 1:
1 solvent of table utilizes factor GUF calculated result
Single natural gas is handled up Embodiment 13 Embodiment 14
7.017 8.961 7.501
As shown in Table 1, GUF is apparently higher than single natural gas and handles up in embodiment 13, shows 13 waste natural gas of embodiment- Propane mixed solvent utilization rate is higher, and economic benefit is more preferable.
Embodiment 14,
The cold later period waste natural gas-propane mixed solvent of adopting of a kind of foam oil oil reservoir as described in embodiment 1,12,13 gulps down Experimental method is spat, difference is, waste natural gas-propane in the mixed solvent waste natural gas-propane molar ratio is 36:64, Waste natural gas and propane mixed solvent phasor are calculated as shown in Figure 1, determining that mixing is molten according to the temperature of oil reservoir and injection pressure Agent state is liquid.Container experiment need injection pressure and at a temperature of it is 24 hours static so that natural gas-propane is complete Full mixing, reaches balance.
Calculating artificial core porosity φ is respectively 41.38%.Injecting stratum water speed is respectively 10cm3/min、20cm3/ min、30cm3/ min, measurement core permeability is respectively 33.70 μm3、33.70μm3、33.70μm3, final core permeability value It is 33.70 μm3.Calculating rock core initial oil saturation according to saturation stratum oil quality m is 87.66%.
Average pressure P is calculated according to formula (1)~formula (4)It is cold to adopt averagely, cold adopt pressure difference PIt is cold to adopt pressure difference, gas-oil ratio GIt is cold to adoptWith extraction journey Spend RIt is cold to adoptAs shown in Figure 10.As shown in Figure 10, with the progress of experiment, foam oil oil reservoir average pressure PIt is cold to adopt averagelyIt gradually decreases, but It is cold to adopt pressure difference PIt is cold to adopt pressure differenceIt gradually increases, so that recovery percent of reserves RIt is cold to adoptIt gradually increases.Gas-oil ratio GIt is cold to adoptFirst increase, after due to foam oil Formation decrease, the later period with the disappearance of foam oil phenomenon, and gradually increases.
It is as shown in figure 11 to record time, one-dimensional rock core displacement device portal pressure, outlet pressure and each pressure tap pressure.It Afterwards, first is calculated according to mixed gas state equation formula (5) handle up period gas injection rate for 4400cm3.As shown in Figure 11, with The progress of experiment, entrance, outlet and each measuring point pressure are gradually increased to injection pressure, wherein the outlet pressure rate of climb at any time Most fast, the rate of climb is most slow at any time for inlet pressure, shows that the device can embody natural gas injection exhaust gas-propane mixed solvent mistake The pressure change of each point in journey.
Close one-dimensional rock core displacement device import, outlet.Record time, one-dimensional rock core displacement device portal pressure, outlet Pressure and each pressure tap pressure are as shown in figure 12.As shown in Figure 12, as the progress of experiment, each pressure gradually decrease, show to mix Bonding solvent is gradually dissolved in crude oil, and when the stewing well time being 20 small 47 minutes, pressure decrease speed is lower, shows rate of dissolution It is lower, therefore the stewing well stage terminates.
It is as shown in figure 13 by video camera and high temperature and pressure observation window observation secondary foam oil generation situation, it calculates first and gulps down Spit period average pressure PHandle up average 1, pressure difference PIt handles up pressure difference 1, gas-oil ratio GHandle up 1With recovery percent of reserves RHandle up 1As shown in figure 14.
As shown in Figure 13, secondary foam oil phenomenon can be generated after natural gas injection exhaust gas-propane mixed solvent.It can by Figure 14 Know, first handles up the production phase in period, and with the progress of experiment, handle up period 1 average pressure PHandle up average 1It gradually decreases, presses Poor PIt handles up pressure difference 1It gradually increases, so that recovery percent of reserves RHandle up 1It gradually increases.Gas-oil ratio GHandle up 1At the trend gradually increased.
According to oil field development cost and oil price, the standard for testing end is to handle up that terminate recovery percent of reserves be 2.5%, the 5th The recovery percent of reserves R in periodHandle up 5It is 2.22%, terminates recovery percent of reserves 2.5% less than handling up, waste natural gas-propane mixed solvent It handles up and improves the disappearance of recovery ratio effect, experiment terminates.Record respectively handle up time in period, recovery ratio, gas-oil ratio as shown in fig. 7, Entrance, outlet and each pressure tap pressure are as shown in figure 15, observe secondary foam oil by high temperature and pressure observation window and generate situation As shown in figure 16.Waste natural gas-propane mixed solvent is calculated to handle up recovery percent of reserves RIt handles upAnd experiment ultimate recovery R is 23.31% and 36.86%.
As shown in Figure 7, the present embodiment is handled up recovery percent of reserves RIt handles upAnd experiment ultimate recovery R is respectively 23.31% He 36.86%, and single natural gas is handled up and tests recovery percent of reserves and ultimate recovery is respectively 8.11% and 21.27%, this implementation Example is handled up recovery percent of reserves RIt handles upAnd experiment ultimate recovery R handles up to test than single natural gas and improves 15.2% and 15.59%, adopts Yield increases significantly, and can reduce the gas-oil ratio respectively handled up.The recovery percent of reserves R in addition, the present embodiment is handled upIt handles upAnd experiment is final Recovery ratio R improves 4.34% and 4.87% than embodiment 1, it follows that 14 development effectiveness of embodiment is better than embodiment 1, analysis Reason is that 14 mixed solvent group of embodiment becomes 36:64, and there are liquid, and 1 mixed solvent of embodiment is gaseous state, liquid solvent It is easier to be dissolved in viscous crude than gaseous solvent, reduces viscosity of crude, secondary foam oil is more readily formed after precipitation, therefore, implement 14 development effectiveness of example is better than embodiment 1.
The full degree distribution map of one-dimensional rock core displacement device remaining oil is as shown in Figure 9.As shown in Figure 9,14 remaining oil of embodiment is full It handles up and embodiment 12 with degree significantly lower than single natural gas, further demonstrates that embodiment 14 is handled up and implemented with single natural gas Example 12 is increased substantially compared to more crude oil, foam oil effect of reservoir development is produced.
The GUF for calculating embodiment 14 is as shown in table 1.As shown in Table 1, GUF is apparently higher than single natural gas in embodiment 14 It handles up, but is less than embodiment 13, handle up it follows that 14 economic benefit of embodiment is better than single natural gas, but be worse than reality Apply example 13.Analysis reason is that 14 mixed solvent group of embodiment becomes 36:64, and contained propane content is higher than embodiment 13, causes Increased costs.In summary, for liquid mixed solvent compared with gaseous state mixed solvent, recovery ratio is higher, but economical poor.Work as oil price It is higher, when considering that yield factors are main, liquid mixed solvent may be selected, and oil price is lower, and when considering that economic factor is main, Ying Xuan Select gaseous state mixed solvent.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto, In the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of by anyone skilled in the art, It should be covered by the protection scope of the present invention.

Claims (13)

1. a kind of foam oil oil reservoir is cold to be adopted later period waste natural gas-propane mixed solvent and handles up experimental method, which is characterized in that institute Stating experimental method includes:
1) make the artificial core vacuum state installed in one-dimensional rock core displacement device；
2) preparation simulation foam oil reservoir media: the artificial core is saturated water flooding and formation oil, measures artificial core Porosity φ, permeability and initial oil saturation；
3) foam oil oil reservoir is cold adopts the development phase for simulation: carrying out cold adopt out to the artificial core by one-dimensional rock core displacement device Hair closes the outlet of one-dimensional rock core displacement device when continuous gas phase occurs, and foam oil phenomenon disappears, and calculates foam oil oil reservoir It is cold to adopt development phase recovery percent of reserves；
4) simulation waste natural gas-propane mixed solvent is handled up injection stage: the artificial rock in Xiang Yiwei rock core displacement device The heart injects waste natural gas-propane mixed solvent；
5) simulation waste natural gas-propane mixed solvent is handled up the stewing well stage；
6) simulation waste natural gas-propane mixed solvent is handled up the production phase: by one-dimensional rock core displacement device to described artificial The viscous crude of rock core carries out decompression exploitation；
The waste natural gas-propane mixed solvent configuration method: the temperature of configuration process is reservoir temperature, in atmospheric pressure It is lower that propane gas is injected into container, until making propane liquefy on container pressure to propane dew-point pressure；Then according to reality It needs to inject waste natural gas to container；Last adjustment container pressure reaches actually required injection pressure；
In the step 2), by the method and steps of artificial core saturation water flooding and formation oil are as follows:
The entrance for 2-1) opening the one-dimensional rock core displacement device, sucks water flooding, when pressure is connect by negative pressure under vacuum conditions It is changed to injection water flooding when nearly atmospheric pressure, opens the outlet of one-dimensional rock core displacement device later, after water breakthrough, according to the suction of water flooding Enter amount and injection rate, calculates artificial core porosity φ；
The inlet pressure for 2-2) measuring one-dimensional rock core displacement device changes injection stratum water speed, is calculated not according to Darcy's law With the artificial core permeability under injection stratum water speed；
Back-pressure valve 2-3) is utilized, from the entrance of one-dimensional rock core displacement device injection water flooding up to artificial core pressure is in wanted mould On quasi- foam oil reservoir formation pressure, to prevent formation oil from deaerating；
Formation oil 2-4) is injected from the entrance of the one-dimensional rock core displacement device, when injection stratum oil volume is artificial core hole 2-3 times of volume, and the outlet output oil gas-oil ratio of one-dimensional rock core displacement device be equal to formation oil gas-oil ratio when, close one-dimensional rock The outlet of heart driving device；Artificial core initial oil saturation is calculated according to saturation stratum oil quality m.
2. a kind of foam oil oil reservoir according to claim 1 is cold to be adopted later period waste natural gas-propane mixed solvent and handles up reality Proved recipe method, which is characterized in that step 4)~step 6) is repeated several times, carries out multicycle waste natural gas-propane mixed solvent and gulps down It spits process, calculates waste natural gas-propane mixed solvent and handle up recovery percent of reserves and ultimate recovery.
3. a kind of foam oil oil reservoir according to claim 2 is cold to be adopted later period waste natural gas-propane mixed solvent and handles up reality Proved recipe method, which is characterized in that after step 4)~step 6) is repeated several times, calculate the remaining oil saturation of the artificial core Sro。
4. a kind of foam oil oil reservoir according to claim 1 is cold to be adopted later period waste natural gas-propane mixed solvent and handles up reality Proved recipe method, which is characterized in that the method also includes: it is natural using factor evaluation to calculate waste natural gas-propane mixed solvent Gas exhaust gas-propane mixed solvent is handled up experiment effect.
5. a kind of foam oil oil reservoir according to claim 1 is cold to be adopted later period waste natural gas-propane mixed solvent and handles up reality Proved recipe method, which is characterized in that prepare to inject the method for the formation oil: be formed according to output gas, utilize practical foam oil oil Hide output oil, reservoir pressure and at a temperature of the formation oil containing solution gas that is configured to, for simulating the original in practical oil reservoir Oil；
The output oil are as follows: asphalt content is greater than 7wt.%, and acid value is greater than 1.7mgg-1, viscosity of crude is greater than at 50 DEG C 5000mPas, and generate foam oil phenomenon；
Preparing injection with the water flooding is sodium chloride solution, and concentration is 0.1wt.%~0.5wt.%.
6. a kind of foam oil oil reservoir according to claim 1 is cold to be adopted later period waste natural gas-propane mixed solvent and handles up reality Proved recipe method, which is characterized in that when waste natural gas-propane mixed solvent is gaseous state, container is in injection pressure actually required Static 24 hours~48 hours at a temperature of；When waste natural gas-propane mixed solvent is there are when liquid, container is being actually needed Injection pressure and at a temperature of static 12 hours~24 hours.
7. a kind of foam oil oil reservoir according to claim 1 is cold to be adopted later period waste natural gas-propane mixed solvent and handles up reality Proved recipe method, which is characterized in that in the step 2), the material of the artificial core is matched are as follows: quartz sand, quartzy sand adhesive and Alcohol；
Quartz sand particle size size used is 40~100 mesh；
The quartz sand adhesive is epoxy resin；
The quartz sand, epoxy resin and alcohol quality ratio are 40:1:1~50:5:1.
8. a kind of foam oil oil reservoir according to claim 1 is cold to be adopted later period waste natural gas-propane mixed solvent and handles up reality Proved recipe method, which is characterized in that in the step 1), make the artificial core vacuum state installed in one-dimensional rock core displacement device Method are as follows: it is 24~48 hours to the time that one-dimensional rock core displacement device vacuumizes, vacuum pump speed of exhaust 2m3/ h~5m3/ h, 2~4Pa of ultimate vacuum.
9. a kind of foam oil oil reservoir according to claim 1 is cold to be adopted later period waste natural gas-propane mixed solvent and handles up reality Proved recipe method, which is characterized in that in the step 2), injection water flooding velocity interval is 10ml/min~20ml/min, injection ground The velocity interval of layer oil is 0.5ml/min~1.5ml/min.
10. a kind of foam oil oil reservoir according to claim 1 is cold to be adopted later period waste natural gas-propane mixed solvent and handles up reality Proved recipe method, which is characterized in that in the step 3), simulation foam oil oil reservoir is cold to adopt the development phase method particularly includes:
One-dimensional rock core displacement device outlet 3-1) is opened, one-dimensional rock core displacement device is reduced with the pressure decay rate of 0.6~3MPa/h With high-temperature high-pressure visual window pressure；
The forming process of bubble shape and foam oil under reservoir temperature and pressure 3-2) is observed by high-temperature high-pressure visual window: when Continuous gas phase occurs, and when foam oil phenomenon disappears, closes one-dimensional rock core displacement device outlet, foam oil oil reservoir is cold to adopt the development phase Terminate；
3-3) it is calculated by the following formula that foam oil oil reservoir is cold to adopt development phase average pressure PIt is cold to adopt averagely, pressure difference PIt is cold to adopt pressure difference, gas-oil ratio GIt is cold to adoptWith recovery percent of reserves RIt is cold to adopt:
pIt is cold to adopt pressure difference=pIt is cold to adopt entrance-pCold extraction mouth (1)
In formula, pIt is cold to adopt entrance、pCold extraction mouthAnd pIt is cold to adopt jRespectively foam oil oil reservoir is cold adopts stage one-dimensional rock core displacement device portal pressure, goes out Mouth pressure and the one-dimensional rock core displacement fill j-th of the pressure tap pressure centered, MPa；VIt is cold to adoptRank is adopted for foam oil oil reservoir is cold Section gas production, cm3；mIt is cold to adoptStage oil production, g are adopted for foam oil oil reservoir is cold；ρIt is cold to adoptFor foam oil oil reservoir, cold to adopt stage output oil close Degree, g/cm3, m is that artificial core is saturated stratum oil quality, g.
11. a kind of foam oil oil reservoir according to claim 1 is cold to be adopted later period waste natural gas-propane mixed solvent and handles up reality Proved recipe method, which is characterized in that in the step 4), injection waste natural gas-propane mixed solvent method includes:
The outlet for 4-1) opening one-dimensional rock core displacement device, injects waste natural gas-propane mixed solvent, and injection pressure is greater than 4MPa closes the outlet of one-dimensional rock core displacement device when the outlet pressure of one-dimensional rock core displacement device is equal to injection pressure；
Time, the inlet pressure of one-dimensional rock core displacement device, outlet pressure and each pressure tap pressure 4-2) are recorded in the above process；
4-3) first is calculated according to mixed gas state equation to handle up period gas injection rate VNote 1:
In formula (5), PInitial 1For period 1 waste natural gas-propane mixed solvent container initial pressure, MPa；VInitial 1It is first week Phase mixed solvent container initial volume, cm3；ZInitial 1For the compression of period 1 waste natural gas-propane mixed solvent original state because Son, PTerminate 1Waste natural gas-propane mixed solvent container pressure, MPa after for the period 1；VTerminate 1Terminate for the period 1 Waste natural gas-propane mixed solvent container volume afterwards, cm3；ZTerminate 1For period 1 waste natural gas-propane mixed solvent knot Pencil state compressibility factor, P0For atmospheric pressure, MPa；
In the step 5), the handle up method in stewing well stage of the simulation waste natural gas-propane mixed solvent includes:
Close import, the outlet of one-dimensional rock core displacement device, record time, one-dimensional rock core displacement device portal pressure, outlet pressure Power and each pressure tap pressure；
The time in the stewing well stage is 12~24 hours；
In the step 6), the handle up specific steps of production phase of simulation waste natural gas-propane mixed solvent include:
The outlet of one-dimensional rock core displacement device is opened, the one-dimensional rock core displacement dress is reduced with the pressure drop rate of 0.6~3MPa/h Interior pressure is set, when pressure is down to 1~2MPa, closes the outlet of one-dimensional rock core displacement device, the production phase terminates；
Waste natural gas-propane mixed solvent is calculated by the following formula to handle up period 1 average pressure PHandle up average 1, pressure difference PIt handles up pressure difference 1, gas-oil ratio GHandle up 1With recovery percent of reserves RHandle up 1:
pIt handles up pressure difference 1=pIt handles up entrance 1-pIt handles up outlet 1 (6)
In formula (6)-(9), pIt handles up entrance 1、pIt handles up outlet 1And pHandle up 1jRespectively first handle up period one-dimensional rock core displacement device portal pressure, Outlet pressure and j-th of pressure tap pressure, MPa；VHandle up 1It handles up period gas production for first, cm3；mHandle up 1It handles up the period for first Oil production, g；ρHandle up 1It handles up period output oil density for first, g/cm3；M calculates artificial core initial oil saturation, g.
12. a kind of cold later period waste natural gas-propane mixed solvent of adopting of foam oil oil reservoir according to claim 10 is handled up Experimental method, which is characterized in that step 4)~step 6) is repeated several times, carries out multicycle waste natural gas-propane mixed solvent It handles up process, calculates waste natural gas-propane mixed solvent and handle up recovery percent of reserves and ultimate recovery, comprise the following steps that
According to oil field development cost and oil price, the standard for testing end is to handle up to terminate recovery percent of reserves between 1%~5%；When The recovery percent of reserves R in i-th of periodHandle up iLess than handle up terminate recovery percent of reserves when, waste natural gas-propane mixed solvent is handled up raising Recovery ratio effect disappears, and experiment terminates；
Record time, the oil production m in period of respectively handling upHandle up i, gas production, the entrance of one-dimensional rock core displacement device, one-dimensional rock core displacement The outlet of device and each pressure tap pressure observe secondary foam oil by high-temperature high-pressure visual window and generate situation；By following Formula calculates the period recovery percent of reserves R that respectively handles upHandle up i, calculate waste natural gas-propane mixed solvent and handle up recovery percent of reserves RIt handles upAnd most Whole recovery ratio R:
R=RIt is cold to adopt+RIt handles up (11)。
13. a kind of cold later period waste natural gas-propane mixed solvent of adopting of foam oil oil reservoir according to claim 12 is handled up Experimental method, which is characterized in that after step 4)~step 6) is repeated several times, calculate the remaining oil saturation of the artificial core Spend SroMethod include:
Artificial core is successively taken out from one-dimensional rock core displacement device, measures artificial core W containing oil qualityo, artificial core quality Ws, last period handles up output oil density ρo, quartz sand density ps, it is calculate by the following formula rock core remaining oil saturation Sro
It determines the distance that every piece of rock core center is exported to one-dimensional rock core displacement device, draws distance and be saturated with rock core remaining oil Spend SroRelational graph obtains one-dimensional rock core displacement device remaining oil saturation distribution map；
Calculating waste natural gas-propane mixed solvent is handled up using factor evaluation waste natural gas-propane mixed solvent tests effect The specific method of fruit:
Waste natural gas-propane mixed solvent is calculated using factor GUF by following formula:
A is waste natural gas-propane mixed solvent usage factor in formula (13), (14)；mHandle up iIt handles up period oil production for i-th,To inject waste natural gas volume,To inject propane volume, x is that injection in the mixed solvent is natural The molar fraction of gas；Y is the molar fraction for injecting in the mixed solvent propane；Due to natural gas be exhaust gas, infuse mixed solvent at Originally propane is mostly come from, b is propane and Gas Prices ratio, b=2 to 8；VInfuse iIt handles up period gas injection rate for i-th, cm3；VIt adoptsFor It handles up the cumulative gas production in each period in stage, cm3。
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