CN106894808A - It is a kind of to determine hypotonic closing sand body gas drive and handle up the method for limit operating radius - Google Patents
It is a kind of to determine hypotonic closing sand body gas drive and handle up the method for limit operating radius Download PDFInfo
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- CN106894808A CN106894808A CN201710119900.1A CN201710119900A CN106894808A CN 106894808 A CN106894808 A CN 106894808A CN 201710119900 A CN201710119900 A CN 201710119900A CN 106894808 A CN106894808 A CN 106894808A
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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
- E21B47/00—Survey of boreholes or wells
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- 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
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Abstract
It is a kind of to determine hypotonic closing sand body gas drive and handle up the method for limit operating radius, including：The startup pressure of step 1, measurement target block rock core gas displacement crude oil；The curve that step 2, the strata pressure for obtaining oil reservoir each point in target block production process with reservoir numerical simulation software CMG are changed over time；Formation pressure gradient is handled up controllable sphere of action more than the position as gas drive of the free-boundary problem during step 3, gas drive are handled up；Formation pressure gradient is equal to the position of free-boundary problem and is hypotonic closing sand body gas drive and handles up limit operating radius during gas drive is handled up.The present invention obtained it is a kind of determine hypotonic closing sand body gas drive and handle up the method for sphere of action, for handle up gas drive reasonable well spacing, monitoring nitrogen soak sphere of action of next step provides good foundation.Invention can apply to LOW PERMEABILITY RESERVOIR other gases, water and handle up exploitation, it is not limited to nitrogen.
Description
Technical field
Determine hypotonic closing sand body gas drive and handle up the method for limit operating radius the present invention relates to a kind of, belong to oil gas field and open
Hair field of engineering technology.
Background technology
Hypotonic closing sand body refers to closing sand body of the reserves less than 9.8 ten thousand tons in LOW PERMEABILITY RESERVOIR, it have oil reservoir bury it is deep,
Sand body change is fast, reservoir change is fast, anisotropism is strong, easily pollute it is pressure-sensitive greatly the characteristics of.But it is more that quantity is longitudinally developed because of it, plane
Spread is complicated, it is difficult to is developed with a set of series of strata and takes into account these sand bodies.Therefore closing sand body is typically the exploitation of exhaustion formula, with landing surface
The decline of energy, shown in production low liquid measure, in low aqueous, the low feature of low recovery percent of reserves three.Gas injection is often used on oil field
The mode handled up is developed.The features such as relatively other gases of nitrogen have low cost, corrosion-free, pollution is small, can be effective
Set up pressure system, supplement bottom energy.
Mining site is it was verified that nitrogen soak can well improve the recovery ratio that LOW PERMEABILITY RESERVOIR closes sand body.But it is live real
Sphere of action understanding during applying for nitrogen soak is indefinite, no matter causing sand body volume, permeability, the inclination angle of operation
All use same measure.The sphere of action of nitrogen soak occurs in that unbalanced phenomenon, and a part of sand body is due to nitrogen injection rate
Excessive, nitrogen sphere of action reaches sand body edge already, causes unnecessary waste situation；Another part sand body is noted due to nitrogen
Enter amount not enough, cause nitrogen soak sphere of action not reach requirement.
The sphere of action of nitrogen soak is mainly determined by two aspect factors：(1) because formation fracture pressure and nitrogen inject
The reason for equipment, the injection rate of nitrogen soak is limited, and this just determines that the sphere of action of nitrogen soak is limited.(2)
There is startup pressure in LOW PERMEABILITY RESERVOIR, stratum its barometric gradient more remote apart from oil well is just smaller, when formation pressure gradient is less than
During oil-gas free-boundary problem, nitrogen cannot drive crude oil.And nitrogen is during earth-layer propagation, with sphere of action
Increase, its ability to function is gradually reduced, and after reaching certain effect scope, nitrogen cannot drive crude oil.There is presently no effective
Ground method come determine it is hypotonic closing sand body nitrogen soak limit operating radius.
The content of the invention
In view of the shortcomings of the prior art, determine hypotonic closing sand body gas drive the invention provides one kind and handle up limit effect partly
The method in footpath.The present invention handles up gas drive reasonable well spacing, monitoring nitrogen soak sphere of action there is provided reference, especially also directed to nitrogen
Gas handles up reasonable well spacing, monitoring nitrogen soak sphere of action there is provided accurate foundation.
Summary of the invention：
Gas drive handle up can improve well LOW PERMEABILITY RESERVOIR close sand body recovery ratio, but during field conduct for
The sphere of action understanding of nitrogen soak is indefinite, causes the sphere of action of nitrogen soak to occur in that unbalanced phenomenon.
Method of the present invention is：The free-boundary problem of target block rock core nitrogen-crude oil is measured first.Secondly
With numerical simulation software, set up the model of target block nitrogen soak and be fitted oil reservoir production history, obtain block production
During, the curve that the pressure of each position is changed over time.Finally by Data Integration, strata pressure during nitrogen soak
Gradient is nitrogen soak sphere of action more than the position of free-boundary problem, and formation pressure gradient is equal to the position of free-boundary problem
It is set to limit operating radius.
Technical scheme is as follows：
It is a kind of to determine hypotonic closing sand body gas drive and handle up the method for limit operating radius, including：
The startup pressure of step 1, measurement target block rock core gas displacement crude oil；
Step 2, the strata pressure that oil reservoir each point in target block production process is obtained with reservoir numerical simulation software CMG
The curve for changing over time；
Formation pressure gradient is gulped down more than the position as gas drive of the free-boundary problem during step 3, gas drive are handled up
Tell controllable sphere of action；Formation pressure gradient is hypotonic closing sand equal to the position of free-boundary problem during gas drive is handled up
Body gas drive is handled up limit operating radius.
According to currently preferred, the gas drive gas is nitrogen.
According to currently preferred, in the step 1, the startup pressure of target block rock core gas displacement crude oil is measured
Method is as follows：
(1-1) calculates the pore volume of the target block rock core；
Be put into the target block rock core of saturation stratum water in core holding unit by (1-2), using mother oil displacement and saturation original
Oil；
Core holding unit is connected source of the gas by (1-3), and gas drive pressure is set by pressure regulator valve, selectes continuous elevated multiple pressures
Force carries out gas drive to target block rock core respectively：
When carrying out gas drive under each pressure spot, the gas drive time is in more than 1.0h, until pressure stability, records target block
The fluid flow and corresponding core holding unit inlet pressure of rock core outflow；
(1-4) draws gas drive pressure --- fluid flow curve according to the data that step (1-3) measurement is obtained；It is fitted and prolongs
This curve long, when curve upper fluid flow is 0, corresponding gas drive pressure is startup pressure；Start pressure and target block
The ratio of rock core length is free-boundary problem, unit kPa/m.
According to currently preferred, in the step 2, obtain target block with reservoir numerical simulation software CMG and produce
During oil reservoir each point the method for curve that changes over time of pressure it is as follows：
(2-1) is with the Winprop modules of reservoir numerical simulation software CMG to the density of target block crude oil, viscosity, full
It is fitted with strata pressure and dissolution characteristics：Free-boundary problem corresponding to different crude oil is different, energy after fitting
Flow behavior of the crude oil in numerical model is preferably embodied, target block gas drive is depicted exactly and is handled up limit effect partly
Footpath；
(2-2) according to reserves, reservoir thickness, permeability, inclines on the basis of master goal block whole development history
Angle, oil well characteristic, set up reservoir numerical simulation conceptual model；By oil well production data, production history is fitted, runs oil reservoir number
Strata pressure that the Result-Graph modules of value simulation softward CMG derive each point of target block stratum changes with time song
Line.
According to currently preferred, in the step 3, formation pressure gradient refers to during the gas drive is handled up：By institute
The pressure of each point of the stratum for obtaining, by formulaThe barometric gradient of each position of oil reservoir is obtained, wherein G is stratum
The barometric gradient of point-to-point transmission, P1、P2The pressure on respectively above-mentioned 2 points of stratum, L is the distance of stratum point-to-point transmission.
The advantage of the invention is that：
1. the present invention obtained it is a kind of determine hypotonic closing sand body gas drive and handle up the method for sphere of action, be next step to gas
Drive handles up reasonable well spacing, monitoring nitrogen soak sphere of action there is provided good foundation.
2. handled up exploitation present invention could apply to LOW PERMEABILITY RESERVOIR other gases, water, it is not limited to nitrogen.
3. Method And Principle of the present invention can also be applied to LOW PERMEABILITY RESERVOIR gas, water drive for exploitation, it is not limited to
Handle up exploitation.
Brief description of the drawings
Fig. 1 is the reservoir numerical simulation conceptual model that step of the present invention (2-2) is set up, in figure, longitudinal data
Unit is kPa；
Two point pressure versus time curve in Fig. 2 stratum；
Fig. 3 is the partial enlarged drawing of a-quadrant in Fig. 2；
Fig. 4 is to determine that hypotonic closing sand body gas drive is handled up the schematic diagram of limit operating radius in step 3 of the present invention；
Fig. 5 is the Changing Pattern figure of the nitrogen soak limit operating radius obtained using the present invention.
Specific embodiment
The present invention is described in detail with reference to embodiment and Figure of description, but not limited to this.
As Figure 1-5.
Embodiment,
In the present embodiment, the gas drive gas is nitrogen.The present invention is also not limited to nitrogen, can also combine side of the invention
Method carries out gas drive measure using other gases.But it is noted that step 1-3 all must carry out gas drive using identical gas.
By taking certain closing sand body as an example, contain area 0.04km2, 1.9 ten thousand tons of oil in place.11.3 ° of stratigraphic dip, there is three oil-bearing layer,
Perforating depth is 2036m, 2037m, 2038m, and core intersection is 5.2m.Oil reservoir mean permeability is 20m D, initial reservoir pressure
It is 26.2MPa.
It is a kind of to determine hypotonic closing sand body gas drive and handle up the method for limit operating radius, including：
The startup pressure of step 1, measurement target block rock core gas displacement crude oil, measures the startup pressure of nitrogen-crude oil
Gradient is 39.1kPa/m；Wherein it is described startup pressure refer to：Using in the gas pressure gas drive target block rock core for increasing continuously
Crude oil, the data that obtain of measurement draw gas drive pressure --- fluid flow curve；This curve is fitted and extends, when curve is upper
When body flow is 0, corresponding gas drive pressure is startup pressure；；
Step 2, the strata pressure that oil reservoir each point in target block production process is obtained with reservoir numerical simulation software CMG
The curve for changing over time；Combining target block geologic information, on the basis of overall block exploitation history is grasped, with oil reservoir
Numerical simulation software CMG, sets up target block gas drive and handles up and model and be fitted oil reservoir production history, such as nitrogen, finally gives this
In block production process, the curve that the pressure of oil reservoir each point is changed over time；The software combining target block geologic information is obtained
The curve that the pressure of oil reservoir each point is changed over time is the conventional technical means of those skilled in the art；
Step 3, by step 2 obtain Data Integration set：Formation pressure gradient is more than during gas drive is handled up
The position of the free-boundary problem is gas drive and handles up controllable sphere of action；Formation pressure gradient is equal to during gas drive is handled up
The position of free-boundary problem is hypotonic closing sand body gas drive and handles up limit operating radius；The formation pressure gradient is stratum
The ratio of pressure and stratum distance between two points between 2 points, unit kPa/m.
In the step 1, the method for the startup pressure of measurement target block rock core gas displacement crude oil is as follows：
(1-1) calculates the pore volume of the target block rock core；Specific measurement process data those skilled in the art institute
Well known measurement process, will target block rock core drying after, claim dry weight；Target block rock core is evacuated and saturation stratum water,
Claim weight in wet base, the pore volume of the target block rock core is obtained according to weightening weight and stratum water density ratio；
Be put into the target block rock core of saturation stratum water in core holding unit by (1-2), using mother oil displacement and saturation original
Oil；Until irreducible water saturation is reached, record discharge water；Ground environment setting core holding unit wherein according to target block
Ambient parameter, for example, setting core holding unit ambient parameter：Plus confined pressure 1.5MPa, 50 DEG C -55 DEG C of environment temperature；It is preferred that
, using crude oil with the discharge capacity displacement of 0.02ml/min and saturation crude oil, and remain that confined pressure is higher than crude oil injection pressure
1MPa；
Wherein, the preferred embodiment of the utilization mother oil displacement is：First to target block rock core small displacement mother oil displacement, with
After increase discharge capacity, until target block rock core be in irreducible water saturation state；Accumulative injection oil mass is about 15 times of target block rocks
Heart pore volume；
Core holding unit is connected source of the gas by (1-3), and gas drive pressure is set by pressure regulator valve, selectes continuous elevated multiple pressures
Force carries out gas drive to target block rock core respectively：
When carrying out gas drive under each pressure spot, the gas drive time is in more than 1.0h, until pressure stability, records target block
The fluid flow and corresponding core holding unit inlet pressure of rock core outflow；Selected continuous elevated multiple pressure spots are respectively to mesh
Mark block rock core carries out gas drive：Pressure be pressurized step by step since 0.01MPa 0.02MPa, 0.03MPa, 0.04MPa, 0.05MPa,
0.06MPa ..., 3.0MPa；The fluid flow and corresponding core holding unit inlet pressure of record target block rock core outflow, survey
Amount 3 times, measurement error is recorded when being less than 5%；
(1-4) draws gas drive pressure --- fluid flow curve according to the data that step (1-3) measurement is obtained；It is fitted and prolongs
This curve long, when curve upper fluid flow is 0, corresponding gas drive pressure is startup pressure；Start pressure and target block
The ratio of rock core length is free-boundary problem, unit kPa/m.
In the step 2, the pressure of oil reservoir each point in target block production process is obtained with reservoir numerical simulation software CMG
The method of the curve that power is changed over time is as follows：
(2-1) is with the Winprop modules of reservoir numerical simulation software CMG to the density of target block crude oil, viscosity, full
It is fitted with strata pressure and dissolution characteristics：Free-boundary problem corresponding to different crude oil is different, energy after fitting
Flow behavior of the crude oil in numerical model is preferably embodied, target block nitrogen soak limit effect half is depicted exactly
Footpath；
(2-2) according to reserves, reservoir thickness, permeability, inclines on the basis of master goal block whole development history
Angle, oil well characteristic, set up reservoir numerical simulation conceptual model, such as Fig. 1, by the pressure curve between 2 points, can obtain two
Pressure differential between point, finally gives the barometric gradient of point-to-point transmission；By oil well production data, production history, operation oil are fitted
Hiding the Result-Graph modules of numerical simulation software CMG derives the strata pressure of each point of target block stratum with the change of time
Change curve, such as Fig. 2.
In the step 3, formation pressure gradient refers to during the gas drive is handled up：By each point of resulting stratum
Pressure, by formulaThe barometric gradient of each position of oil reservoir is obtained, wherein G is the barometric gradient of stratum point-to-point transmission,
P1、P2The pressure on respectively above-mentioned 2 points of stratum, L is the distance of stratum point-to-point transmission.By adjacent 2 points of pressure differential, two are obtained
Barometric gradient between point, the barometric gradient for finally giving whole each position of oil reservoir changes with time rule.When pressure ladder
When angle value replaces the free-boundary problem of crude oil equal to nitrogen flooding, nitrogen soak limit operating radius can be obtained and changed with time
Curve.What the curve can be quantified observes the scope of the available oil of the cycle nitrogen soak, is that next step nitrogen soak is closed
Removing the work well, change development scheme provide foundation well.
Claims (5)
1. it is a kind of to determine hypotonic closing sand body gas drive and handle up the method for limit operating radius, it is characterised in that the method includes：
The startup pressure of step 1, measurement target block rock core gas displacement crude oil；
Step 2, the strata pressure for obtaining oil reservoir each point in target block production process with reservoir numerical simulation software CMG are at any time
Between change curve；
Step 3, gas drive handle up during formation pressure gradient more than the position as gas drive of the free-boundary problem, handle up can
Control sphere of action；Formation pressure gradient is hypotonic closing sand body gas equal to the position of free-boundary problem during gas drive is handled up
Drive is handled up limit operating radius.
2. it is according to claim 1 it is a kind of determine hypotonic closing sand body gas drive and handle up the method for limit operating radius, it is special
Levy and be, the gas drive gas is nitrogen.
3. it is according to claim 1 it is a kind of determine hypotonic closing sand body gas drive and handle up the method for limit operating radius, it is special
Levy and be, in the step 1, the method for the startup pressure of measurement target block rock core gas displacement crude oil is as follows：
(1-1) calculates the pore volume of the target block rock core；
Be put into the target block rock core of saturation stratum water in core holding unit by (1-2), using mother oil displacement and saturation crude oil；
Core holding unit is connected source of the gas by (1-3), and gas drive pressure is set by pressure regulator valve, selectes continuous elevated multiple pressure spots
Gas drive is carried out to target block rock core respectively：
When carrying out gas drive under each pressure spot, the gas drive time is in more than 1.0h, until pressure stability, records target block rock core
The fluid flow of outflow and corresponding core holding unit inlet pressure；
(1-4) draws gas drive pressure --- fluid flow curve according to the data that step (1-3) measurement is obtained；It is fitted and extends this
Curve, when curve upper fluid flow is 0, corresponding gas drive pressure is startup pressure；Start pressure and target block rock core
The ratio of length is free-boundary problem, unit kPa/m.
4. it is according to claim 1 it is a kind of determine hypotonic closing sand body gas drive and handle up the method for limit operating radius, it is special
Levy and be, in the step 2, the pressure of oil reservoir each point in target block production process is obtained with reservoir numerical simulation software CMG
The method of the curve that power is changed over time is as follows：
Density, viscosity, saturation ground of the Winprop modules of (2-1) utilization reservoir numerical simulation software CMG to target block crude oil
Stressor layer and dissolution characteristics are fitted；
(2-2) on the basis of master goal block whole development history, according to reserves, reservoir thickness, permeability, inclination angle, oil
Well characteristic, sets up reservoir numerical simulation conceptual model；By oil well production data, production history is fitted, runs numerical reservoir mould
Intending the Result-Graph modules of software CMG derives the strata pressure versus time curve of each point of target block stratum.
5. it is according to claim 1 it is a kind of determine hypotonic closing sand body gas drive and handle up the method for limit operating radius, it is special
Levy and be, in the step 3, formation pressure gradient refers to during the gas drive is handled up：By each point of resulting stratum
Pressure, by formulaThe barometric gradient of each position of oil reservoir is obtained, wherein G is the barometric gradient of stratum point-to-point transmission,
P1、P2The pressure on respectively above-mentioned 2 points of stratum, L is the distance of stratum point-to-point transmission.
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| CN111622736A (en) * | 2020-04-14 | 2020-09-04 | 中国石油大学(华东) | Method and system for determining limit well spacing of heavy oil reservoir chemical flooding technology |
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