CN105116107B - CO under a kind of reservoir condition2In extra-low permeability homogenizing rock core, phase sentences knowledge method - Google Patents
CO under a kind of reservoir condition2In extra-low permeability homogenizing rock core, phase sentences knowledge method Download PDFInfo
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Abstract
The present invention provides CO under a kind of reservoir condition2In extra-low permeability homogenizing rock core, phase sentences knowledge method, and of the present invention be according to different pressures CO2Dissolubility and rock core different modes CO in formation oil2The method that the gas-oil ratio of the port of export combines during drive, judges CO2CO during drive and the Water Alternate Gas displacement of reservoir oil2State in oil.To a certain specific reservoir temperature, static data is to measure CO under the conditions of different pressures according to PVT2Dissolubility data in crude oil；The gas-oil ratio data of port of export when dynamic data is different pressures during rock core gas drive or Water alternating gas.Contrasted according to quiet dynamic data, CO in analysis displacement process2The state in crude oil and stratum water under formation conditions.Can be CO2The design for driving live scheme provides certain guidance.
Description
Technical field
The present invention relates to recovery efficiency technique field, CO under more particularly to a kind of reservoir condition are improved in oil-gas field development2
In extra-low permeability homogenizing rock core, phase sentences knowledge method.
Background technology
CO2It is primarily present four kinds of states such as gaseous state, supercritical, liquid and solid-state.When temperature higher than 31.1 DEG C, pressure is higher than
During 7.38 MPa, CO2Into critical state, in supercriticality, CO2Typical physical is：Density is bordering on liquid, is gas
Hundred times；Viscosity is bordering on gas, with liquid phase ratio, little two orders of magnitude；Diffusion coefficient between gas and liquid, about gas
The 1/100 of body, than the big hundred times of liquid, thus with larger solvability.When temperature is less than -78 DEG C, CO2Will be with solid-state
Form is present.
CO2The displacement of reservoir oil improves recovery ratio and buries technology and increasingly receives as a kind of effective ways of greenhouse gases recycling
To attention, the technology has a good application prospect in hyposmosis, extra-low permeability oil reservoirs exploitation.CO2 is dissolvable in water in crude oil
As mixed phase, if in being not dissolved in crude oil being non-mixed phase；According to CO2Mixed phase can be reached under formation conditions with in-place oil,
CO2Technology of reservoir sweep is divided into mixed phase again and drives and two kinds of non-phase-mixing driving.Compare non-phase-mixing driving, CO2Can under mixed phase state with in-place oil
Obtain more high recovery rate, CO2With in-place oil can mixed phase be the key condition that carries out reservoir selection.
CO under reservoir condition2Mainly it is divided to two kinds with the state of in-place oil, one kind is CO2It is dissolved in oil, CO2For discontinuous
Phase；Another kind is CO2In the form of free gas, CO2For continuous phase.Minimum miscibility pressure（MMP）It is CO2With in-place oil
Reach the minimum pressure of mixed phase.Generally with mean reservoir pressure and minimum miscibility pressure during oil reservoir development（MMP）It is relatively large
Little judgement CO2Whether-crude oil system reaches mixed phase under reservoir conditions.When mean reservoir pressure is more than MMP, it is judged to CO2It is mixed
Mutually drive；Conversely, being CO2Non-phase-mixing driving.Determine that the method for minimum miscibility pressure mainly has experimental determination and Theoretical Calculation at present
Two kinds, wherein, laboratory determines that method includes slim-tube test method, interfacial tension disappearance method, vapour density method and rises bubble instrument method；It is theoretical
Calculating method includes empirical equation prediction and the analysis of chart method, multiple-contact method, Method for Numerical, state equation calculating method and anchor line (string)
Calculating method.In traditional laboratory determination method, the slim-tube test method that nineteen eighty-three Stalkup is proposed be it is at present internationally recognized and
The method of general determination minimum miscibility pressure, also always as the standard method for determining minimum miscibility pressure.But due to note
Different times oil reservoir different parts CO during gas2State is to change, supercritical CO under reservoir condition2Have in crude oil good
Good solubility property, MMP can not accurately judge CO2CO in displacement process2State change.So using mean reservoir pressure value and
MMP relative sizes can not truly reflect CO in oil reservoir2State change in the earth formation.
Judge CO at present2Mixed phase drive and non-phase-mixing driving are the phases according to current mean reservoir pressure and minimum miscibility pressure
Size is judged, being mixed phase when strata pressure is more than minimum miscibility pressure, otherwise being non-mixed phase, the method is although can be bright
Really mixed phase state is qualitatively judged, but do not accounted for the change of true oil reservoir internal pressure, it is this to be divided into two
Determination methods are excessively general, and the process to causing result recognizes unclear.Additionally, determining minimum miscibility pressure using slim-tube test method
Time-consuming, workload is big.
The content of the invention
In order to overcome in existing method, MMP can not accurately judge CO2CO in displacement process2State change and can not be truly anti-
Reflect CO in oil reservoir2The problem of state change in the earth formation, the present invention provide CO under a kind of reservoir condition2In extra-low permeability homogenizing
In rock core, phase sentences knowledge method, and of the present invention be according to different pressures CO2Dissolubility in formation oil（Static data）
With rock core different modes CO2The gas-oil ratio of the port of export during drive（Dynamic data）The method for combining, judges CO2Drive and air water
Replace CO in oil displacement process2State in oil.By CO2The qualitative judgement of state can be with each facies tract in rational judgment rock core
Distribution and size, be deeper into understanding CO2Oil displacement process and the feature and different modes CO of displacement2Mechanism of oil displacement provides one
New method is planted, can be CO2The design for driving live scheme provides certain guidance.
The technical solution used in the present invention is：
CO under a kind of reservoir condition2Phase sentences knowledge method in the extra-low permeability homogenizing rock core, concretely comprises the following steps：
1) obtain CO under different pressures2Dissolubility in formation oil
A, with reservoir fluid：Sample kettle three times, evacuation 2 hours are cleaned with petroleum ether；Sample kettle and crude oil sample kettle exist
At 50 DEG C, constant temperature was pressed into crude oil in sample kettle with manual pump after 6 hours；
B, with specified CO2The reservoir fluid of concentration：First by pipeline and PVT instrument petroleum ethers, and dried up with nitrogen
After be evacuated to below 200mmHg, then by CO2Gas opens the valve of PVT instrument, pressure Jing after the boosting of oil-free lubrication supercharger
Enter CO2Gas；Volume, CO after constant temperature 4 ~ 5 hours, according to sample kettle2CO in pressure and temperature computation PVT instrument2Amount, adjustment
Pressure is to required CO2Amount；After the reservoir fluid in sample kettle is pressed into single-phase and constant temperature 4 hours simultaneously, by reservoir fluid pressure
Enter in PVT instrument；
C, the PVT properties for determining matched somebody with somebody reservoir fluid：By reservoir fluid in PVT instrument be pressed into it is single-phase after, stirring shakes up, stable
30 minutes；Then pressure from high to low, determines the reservoir fluid PVT data under different pressures respectively every 1-2MPa；According to body
It is that the catastrophe point of volume can draw the bubble point pressure of reservoir fluid, obtains the CO2 concentration corresponding to bubble point pressure and be CO2's
Dissolubility；
2) obtain rock core CO2The gas-oil ratio of the port of export during expelling water
Rock core is chosen, length is 30cm, a diameter of 2.5cm, rock core perm-plug method is 1.707mD, and porosity is
11.4%, experimental temperature is 50 DEG C, experimental simulation oil, and viscosity is 1.5mPa*s, water, and salinity is 60000mg/L, end back pressure
10.0MPa；
Rock sample is dried first, is determined permeability and porosity, is set up irreducible water saturation, with constant flow velocity 0.1ml/
Min carries out water drive oil, stops water filling to after aqueous more than 98.0%；CO is carried out with constant flow velocity 0.1ml/min2Expelling water, directly
To the complete aerogenesis of the port of export；Water, oil-producing and aerogenesis volume are produced in record injection pressure, outlet in experimentation；
3) during rock core displacement CO2 states in crude oil judgement
In three-phase flow stage, CO2In the form of being dissolved in oil, CO2Dissolubility in oil is more than 100, and gas-oil ratio is
0-10.0, the pressure in rock core are 15.5-16.1mpa；
In oil-gas two-phase flow stage, CO2It is dissolved in oil, CO2Dissolubility in oil is 120-140, and gas-oil ratio is 10-
140, the pressure of rock core injection end is 16.1-16.7MPa；CO2It is free gas, gas-oil ratio is 140-1436.
Step 1）In, every time from sample kettle transfer sample when will carry out under the conditions of single-phase.
Step 1）During middle survey reservoir fluid PVT data matter, often determine a pressure point data and will stir, shake up 30 points
Clock, stands 30 minutes.
Step 1）During reservoir fluid PVT data under middle survey different pressures, a reservoir fluid PVT number is surveyed every 2MPa
According to.
Step 2）In experimental water be corresponding oil field simulated formation water.
Beneficial effects of the present invention are：
Of the present invention is during a kind of method combined using quiet dynamic data judges rock core different modes gas drive
CO2State in oil.The invention can be used to judge whole CO2CO in oil displacement process2In oil, the change of state, takes into account and finishes
Fruit and the process for causing the result, are deep understanding different modes CO2The process and mechanism of the displacement of reservoir oil provides a kind of new method, is
CO2The design of live scheme is driven there is provided certain guidance.
It is further detailed below with reference to accompanying drawing.
Description of the drawings
The CO of Fig. 1, crude oil at 50 DEG C under different pressures2Dissolubility data figure.
Fig. 2, CO2Water, oil, gas schematic diagram is produced during drive.
Fig. 3, CO2Pressure and gas-oil ratio variation diagram are injected during drive.
Fig. 4, CO2Rock core facies tract distribution situation during drive.
Specific embodiment
Embodiment 1：
In order to overcome in existing method, MMP can not accurately judge CO2CO in displacement process2State change and can not be truly anti-
Reflect CO in oil reservoir2The problem of state change in the earth formation, the present invention provide CO under a kind of reservoir condition2In extra-low permeability homogenizing
In rock core, phase sentences knowledge method, and of the present invention be according to different pressures CO2Dissolubility in formation oil（Static data）
With rock core different modes CO2The gas-oil ratio of the port of export during drive（Dynamic data）The method for combining, judges CO2Drive and air water
Replace CO in oil displacement process2State in oil.By CO2The qualitative judgement of state can be with each facies tract in rational judgment rock core
Distribution and size, be deeper into understanding CO2Oil displacement process and the feature and different modes CO of displacement2Mechanism of oil displacement provides one
New method is planted, can be CO2The design for driving live scheme provides certain guidance.
CO under a kind of reservoir condition2Phase sentences knowledge method in the extra-low permeability homogenizing rock core, concretely comprises the following steps：
2) obtain CO under different pressures2Dissolubility in formation oil
A, with reservoir fluid：Sample kettle three times, evacuation 2 hours are cleaned with petroleum ether；Sample kettle and crude oil sample kettle exist
At 50 DEG C, constant temperature was pressed into crude oil in sample kettle with manual pump after 6 hours；
B, with specified CO2The reservoir fluid of concentration：First by pipeline and PVT instrument petroleum ethers, and dried up with nitrogen
After be evacuated to below 200mmHg, then by CO2Gas opens the valve of PVT instrument, pressure Jing after the boosting of oil-free lubrication supercharger
Enter CO2Gas；Volume, CO after constant temperature 4 ~ 5 hours, according to sample kettle2CO in pressure and temperature computation PVT instrument2Amount, adjustment
Pressure is to required CO2Amount；After the reservoir fluid in sample kettle is pressed into single-phase and constant temperature 4 hours simultaneously, by reservoir fluid pressure
Enter in PVT instrument；
C, the PVT properties for determining matched somebody with somebody reservoir fluid：By reservoir fluid in PVT instrument be pressed into it is single-phase after, stirring shakes up, stable
30 minutes；Then pressure from high to low, determines the reservoir fluid PVT data under different pressures respectively every 1-2MPa；According to body
It is that the catastrophe point of volume can draw the bubble point pressure of reservoir fluid, obtains the CO2 concentration corresponding to bubble point pressure and be CO2's
Dissolubility；
2) obtain rock core CO2The gas-oil ratio of the port of export during expelling water
Rock core is chosen, length is 30cm, a diameter of 2.5cm, rock core perm-plug method is 1.707mD, and porosity is
11.4%, experimental temperature is 50 DEG C, experimental simulation oil, and viscosity is 1.5mPa*s, water, and salinity is 60000mg/L, end back pressure
10.0MPa；
Rock sample is dried first, is determined permeability and porosity, is set up irreducible water saturation, with constant flow velocity 0.1ml/
Min carries out water drive oil, stops water filling to after aqueous more than 98.0%；CO is carried out with constant flow velocity 0.1ml/min2Expelling water, directly
To the complete aerogenesis of the port of export；Water, oil-producing and aerogenesis volume are produced in record injection pressure, outlet in experimentation；
3) during rock core displacement CO2 states in crude oil judgement
In three-phase flow stage, CO2In the form of being dissolved in oil, CO2Dissolubility in oil is more than 100, and gas-oil ratio is
0-10.0, the pressure in rock core are 15.5-16.1mpa；
In oil-gas two-phase flow stage, CO2It is dissolved in oil, CO2Dissolubility in oil is 120-140, and gas-oil ratio is 10-
140, the pressure of rock core injection end is 16.1-16.7MPa；CO2It is free gas, gas-oil ratio is 140-1436.
In the present invention, by reservoir fluid in PVT instrument be pressed into it is single-phase after, stirring shakes up, and stablizes 30 minutes.Then pressure is by height
To low, the reservoir fluid PVT data under different pressures are determined respectively every 1-2MPa.Often determine a pressure point data to stir
Mix, shake up 30 minutes, stand 30 minutes.The bubble point pressure of reservoir fluid can be drawn according to the catastrophe point of system volume, the bubble
CO2 concentration corresponding to point pressure is CO2Dissolubility.
Solubility test is as shown in Figure 1.
Rock core displacement dynamic data is obtained, and chooses the Berea core of Unite States Standard, and length is 30cm, a diameter of 2.5cm, rock
Heart perm-plug method is 1.707mD, and porosity is 11.4%, and experimental temperature is 50 DEG C, and experiment oil is that long certain oil field of celebrating is simulated
Oil, viscosity is 1.5mPa*s, and experimental water is corresponding oil field simulated formation water, and salinity is 60000mg/L, end back pressure
10.0MPa。
Experimentation is as follows：According to SY/T 5336-2006《Core analysis method》, rock sample is dried, permeability and hole is determined
Porosity；According to SY/T 5354-2007《In rock, two-phase fluid relative permeability is determined》3.4 pairs of rock sample saturations stratum therein
Water, wherein 6.2.4 set up irreducible water saturation；Water drive oil is carried out with constant flow velocity 0.1ml/min, to aqueous more than 98.0%
After stop water filling；CO is carried out with constant flow velocity 0.1ml/min2Drive, until the complete aerogenesis of the port of export；Remember in experimentation
Water, oil-producing and aerogenesis volume are produced in record injection pressure, outlet.
The judgement of CO2 states in crude oil during rock core displacement
If Fig. 2 is rock core CO2Product water, oil-producing and aerogenesis volume during drive, Fig. 3 are that the pressure in injection process is gentle
Oil compares data.The time point of water, aerogenesis and oil-producing is produced according to outlet, the flowing in rock core different types can be divided into.
Fig. 4 is CO2Rock core facies tract distribution situation figure during drive, in the three-phase flow stage, the pressure in rock core is 15.5-
16.1mpa, gas-oil ratio now is 0-10.0, and the dissolubility in oil in the pressure limit is more than 100, it is believed that CO now2
In the form of being dissolved in oil；In the oil-gas two-phase flow stage, the pressure of rock core injection end is 16.1-16.7MPa, now gas and oil
Ratio for 10-1436, dissolubility is 120-140 in the pressure limit, it can be determined that when gas-oil ratio is in 10-140, CO2It is
It is dissolved in oil, during 140-1436, CO2It is free gas.
Embodiment 2：
On the basis of embodiment 1, the present embodiment step 1）In, every time from sample kettle transfer sample when will be in single-phase bar
Carry out under part.
Step 1）During reservoir fluid PVT data under middle survey different pressures, a reservoir fluid PVT number is surveyed every 2MPa
According to.Step 1）During middle survey reservoir fluid PVT data matter, often determine a pressure point data and will stir, shake up 30 minutes, stand
30 minutes.
Can so stablize and clearly measure bubble point pressure.
Step 2）In experimental water be corresponding oil field simulated formation water.With the subsoil water of the simulation oil, thus
Can ensure that the unicity of variable.
Of the present invention is according to different pressures CO2Dissolubility in formation oil（Static data）With rock core CO2Drive process
The gas-oil ratio of the middle different pressures moment port of export（Dynamic analysis）The method for combining, judges CO2CO in oil displacement process2In profit
In state.When gas-oil ratio be less than the pressure when maximum dissolved gas when, it is believed that CO2To be dissolved in the form of oil, it is
Mixed phase state；Otherwise, it is believed that CO2In the form of free gas, it is non-mixed phase state.It is to a certain specific reservoir temperature, static
Data are to measure CO under the conditions of different pressures according to PVT2Dissolubility data in crude oil；Dynamic data is rock core gas drive（Or
Water alternating gas）During different pressures when the port of export gas-oil ratio data.Contrasted according to quiet dynamic data, analyze displacement process
Middle CO2The state in crude oil and stratum water under formation conditions.
Of the present invention is according to different pressures CO2Dissolubility and rock core different modes CO in formation oil2During drive
The method that the gas-oil ratio of the port of export combines, judges CO2CO during drive and the Water Alternate Gas displacement of reservoir oil2State in oil.Pass through
CO2State qualitatively judge can with the distribution of each facies tract in rational judgment rock core and size, be deeper into understanding CO2The displacement of reservoir oil
Journey and the feature and different modes CO of displacement2Mechanism of oil displacement provides a kind of new method, can be CO2Drive the design of live scheme
Certain guidance is provided.
Claims (4)
1. CO under a kind of reservoir condition2In extra-low permeability homogenizing rock core, phase sentences knowledge method, it is characterised in that：Concrete steps
For：
1) obtain CO under different pressures2Dissolubility in formation oil
A, with reservoir fluid：Sample kettle three times, evacuation 2 hours are cleaned with petroleum ether；Sample kettle and crude oil sample kettle are at 50 DEG C
Lower constant temperature is after 6 hours, crude oil is pressed in sample kettle with manual pump, every time from sample kettle transfer sample when will be under the conditions of single-phase
Carry out；
B, with specified CO2The reservoir fluid of concentration：First by pipeline and PVT instrument petroleum ethers, and after being dried up with nitrogen, take out true
Sky to below 200mmHg, then by CO2Gas opens the valve of PVT instrument Jing after the boosting of oil-free lubrication supercharger, is pressed into CO2Gas
Body；Volume, CO after constant temperature 4 ~ 5 hours, according to sample kettle2CO in pressure and temperature computation PVT instrument2Amount, adjustment pressure to institute
Need CO2Amount；After the reservoir fluid in sample kettle is pressed into single-phase and constant temperature 4 hours simultaneously, reservoir fluid is pressed into into PVT instrument
In；
C, the PVT properties for determining matched somebody with somebody reservoir fluid：By reservoir fluid in PVT instrument be pressed into it is single-phase after, stirring shakes up, and stablizes 30 points
Clock；Then pressure from high to low, determines the reservoir fluid PVT data under different pressures respectively every 1-2MPa；According to system body
Long-pending catastrophe point can draw the bubble point pressure of reservoir fluid, obtain the CO2 concentration corresponding to bubble point pressure and be CO2Dissolving
Degree；
2) obtain rock core CO2The gas-oil ratio of the port of export during expelling water
Rock core is chosen, length is 30cm, a diameter of 2.5cm, rock core perm-plug method is 1.707mD, and porosity is 11.4%, it is real
Temperature is tested for 50 DEG C, experimental simulation oil, viscosity is 1.5mPa*s, water, and salinity is 60000mg/L, end back pressure 10.0MPa；
Rock sample is dried first, is determined permeability and porosity, is set up irreducible water saturation, entered with constant flow velocity 0.1ml/min
The water-filling displacement of reservoir oil, stops water filling to after aqueous more than 98.0%；CO is carried out with constant flow velocity 0.1ml/min2Expelling water, until outlet
Hold complete aerogenesis；Water, oil-producing and aerogenesis volume are produced in record injection pressure, outlet in experimentation；
3) during rock core displacement CO2 states in crude oil judgement
In three-phase flow stage, CO2In the form of being dissolved in oil, CO2Dissolubility in oil is more than 100, and gas-oil ratio is 0-
10.0, the pressure in rock core is 15.5-16.1mpa；
In oil-gas two-phase flow stage, CO2It is dissolved in oil, CO2Dissolubility in oil is 120-140, and gas-oil ratio is 10-140,
The pressure of rock core injection end is 16.1-16.7MPa；CO2It is free gas, gas-oil ratio is 140-1436.
2. CO under a kind of reservoir condition according to claim 12Phase sentences knowledge method in the extra-low permeability homogenizing rock core,
It is characterized in that：Step 1）During middle survey reservoir fluid PVT data matter, often determine a pressure point data and will stir, shake up 30
Minute, stand 30 minutes.
3. CO under a kind of reservoir condition according to claim 12Phase sentences knowledge method in the extra-low permeability homogenizing rock core,
It is characterized in that：Step 1）During reservoir fluid PVT data under middle survey different pressures, a reservoir fluid PVT is surveyed every 2MPa
Data.
4. CO under a kind of reservoir condition according to claim 12Phase sentences knowledge method in the extra-low permeability homogenizing rock core,
It is characterized in that：Step 2）In experimental water be corresponding oil field simulated formation water.
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| CN110516295B (en) * | 2019-07-17 | 2021-09-28 | 中国石油天然气股份有限公司 | Calculating CO2Numerical simulation method for driving minimum miscible pressure |
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