CN106639998B - Mother oil displacement method and apparatus - Google Patents
Mother oil displacement method and apparatus Download PDFInfo
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- CN106639998B CN106639998B CN201611196895.6A CN201611196895A CN106639998B CN 106639998 B CN106639998 B CN 106639998B CN 201611196895 A CN201611196895 A CN 201611196895A CN 106639998 B CN106639998 B CN 106639998B
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- 238000011549 displacement method Methods 0.000 title claims abstract description 24
- 239000012530 fluid Substances 0.000 claims abstract description 310
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 86
- 239000003921 oil Substances 0.000 claims abstract description 68
- 239000010779 crude oil Substances 0.000 claims abstract description 47
- 238000006073 displacement reaction Methods 0.000 claims abstract description 46
- 239000011435 rock Substances 0.000 claims abstract description 27
- 238000002347 injection Methods 0.000 claims abstract description 22
- 239000007924 injection Substances 0.000 claims abstract description 22
- 238000000034 method Methods 0.000 claims description 16
- 239000000243 solution Substances 0.000 claims description 14
- 238000010790 dilution Methods 0.000 claims description 9
- 239000012895 dilution Substances 0.000 claims description 9
- 238000005411 Van der Waals force Methods 0.000 claims description 8
- 238000011084 recovery Methods 0.000 abstract description 16
- 239000007788 liquid Substances 0.000 description 12
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000000605 extraction Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 239000013043 chemical agent Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000008293 association colloid Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000009795 derivation Methods 0.000 description 1
- 230000005501 phase interface Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000000159 protein binding assay Methods 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
- E21B43/20—Displacing by water
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geophysics And Detection Of Objects (AREA)
- Physical Or Chemical Processes And Apparatus (AREA)
Abstract
The present invention provides a kind of mother oil displacement method and apparatus.Mother oil displacement method provided by the invention, comprising: from the displacing fluid of multiple groups various concentration, obtain the first displacing fluid；Wherein, the displacing fluid of the multiple groups various concentration is the displacing fluid obtained after being diluted to target reservoir block water flooding, and the corresponding extension rate of every group of displacing fluid is different；First displacing fluid is the corresponding maximum displacing fluid of discrete force in the multiple groups displacing fluid, and the corresponding discrete force of every group of displacing fluid is the discrete force between the three phase boundary that every group of displacing fluid and target reservoir rock, target reservoir crude oil are constituted；It controls water injection equipment and injects first displacing fluid to target reservoir, with displacement target crude oil.Mother oil displacement method and apparatus provided by the invention can be applied to high-temperature oil reservoir, and can improve the recovery ratio of high-temperature oil reservoir.
Description
Technical field
The present invention relates to exploitation technology more particularly to a kind of mother oil displacement method and apparatus.
Background technique
Currently, the mode that oil field at home generallys use water flooding recovery carries out oil extraction.The cardinal principle of water flooding recovery is
The energy on stratum is supplemented using the injection water of injection oil reservoir, and displacement crude oil is flowed from oil reservoir to producing well, realize that crude oil is opened
It adopts.
When carrying out oil extraction by the way of water flooding recovery, in the later period of water flooding recovery, still there is most of crude oil residual
It stays in the earth formation, for the recovery ratio for improving oil reservoir, the oil reservoir for temperature lower than 100 DEG C can pass through in the later period of water flooding recovery
To the mode of oil reservoir injection surfactant, the chemicals such as polymer, with using the further displacement crude oil of chemicals of injection from
Oil reservoir flows into producing well.
But since the temperature tolerance of chemical agent causes chemical agent not to be suitable for high-temperature oil reservoir.For this purpose, studying and proposing effectively
The mother oil displacement method suitable for high-temperature oil reservoir be necessary.
Summary of the invention
Mother oil displacement method and apparatus provided by the invention are suitable for high-temperature oil reservoir, the recovery ratio of high-temperature oil reservoir can be improved.
First aspect present invention provides a kind of mother oil displacement method, comprising:
From the displacing fluid of multiple groups various concentration, the first displacing fluid is obtained；Wherein, the displacing fluid of the multiple groups various concentration
For the displacing fluid obtained after being diluted to target reservoir block water flooding, and the corresponding extension rate of every group of displacing fluid is different；
First displacing fluid is the corresponding maximum displacing fluid of discrete force in the multiple groups displacing fluid, and every group of displacing fluid is corresponding
Discrete force be discrete between three phase boundary that every group of displacing fluid and target reservoir rock, target reservoir crude oil are constituted
Power；
It controls water injection equipment and injects first displacing fluid to target reservoir, with displacement target crude oil.
Further, described from the displacing fluid of multiple groups various concentration, the first displacing fluid is obtained, is specifically included:
According to formula 1:PTot=PVan+PDL, formula 2:PVan=-A/6 π h3, formula 3:PDL=nbkBT(2ψr1ψr2cosh
(kh)-ψr1 2-ψr2 2)/sinh(κh)2, determine that the moisture film of the corresponding discrete force of every group of displacing fluid and the target reservoir is thick
Functional relation between degree；Wherein, the PTotFor the corresponding discrete force of every group of displacing fluid；The PVanFor every group of displacing fluid model
Moral Hua Yinli；The PDLFor the corresponding double electrode layer repulsion of every group of displacing fluid；The A is Hamaker constant；The h is target oil
The water film thickness of hiding；The nbFor the ion number density in displacing fluid；The kBFor Boltzmann constant；The T is absolutely warm
Degree；The ψr1For the Zeta potential for the two-phase interface that target reservoir crude oil and displacing fluid are constituted；The ψr2For displacing fluid and target
The Zeta potential for the two-phase interface that reservoir rocks are constituted；The κ is the Deybe length of displacing fluid；
According to the corresponding functional relation of every group of displacing fluid, first displacing fluid is determined.
Further, described that first displacing fluid is determined according to the corresponding functional relation of every group of displacing fluid, tool
Body includes；
According to the corresponding functional relation of every group of displacing fluid, every group of displacing fluid pair under the same coordinate system is obtained
The relation curve that the discrete force answered changes with the water film thickness of the target reservoir；
According to the corresponding discrete force of every group of displacing fluid with the target reservoir water film thickness change relation curve,
Determine first displacing fluid.
Further, described from the displacing fluid of multiple groups various concentration, before obtaining the first displacing fluid, the method is also wrapped
It includes:
It controls solution dilution equipment and dilutes the target reservoir block water flooding according to different extension rates, obtain multiple groups
The displacing fluid of various concentration.
Further, the control water injection equipment injects first displacing fluid to target reservoir, with displacement target crude oil,
It specifically includes:
It controls the water injection equipment and injects first displacing fluid to the target reservoir according to predetermined period, with displacement mesh
Mark crude oil.
Second aspect of the present invention provides a kind of mother oil displacement device, comprising: obtains module and processing module；Wherein, described
Module is obtained, for obtaining the first displacing fluid from the displacing fluid of multiple groups various concentration；Wherein, the multiple groups various concentration
Displacing fluid is the displacing fluid obtained after being diluted to target reservoir block water flooding, and the corresponding extension rate of every group of displacing fluid
It is different；First displacing fluid is the corresponding maximum displacing fluid of discrete force in the multiple groups displacing fluid, every group of displacing fluid
Corresponding discrete force be between the three phase boundary that every group of displacing fluid and target reservoir rock, target reservoir crude oil are constituted from
Dissipate power；
The processing module injects first displacing fluid to target reservoir for controlling water injection equipment, with displacement target
Crude oil.
Further, the acquisition module is specifically used for according to formula 1:PTot=PVan+PDL, formula 2:PVan=-A/6 π
h3, formula 3:PDL=nbkBT(2ψr1ψr2cosh(kh)-ψr1 2-ψr2 2)/sinh(κh)2, determine that every group of displacing fluid is corresponding
Functional relation between discrete force and the water film thickness of the target reservoir；And according to the corresponding function of every group of displacing fluid
Relational expression determines first displacing fluid；Wherein, the PTotFor the corresponding discrete force of every group of displacing fluid；The PVanIt is every group
The corresponding Van der Waals force of displacing fluid；The PDLFor the corresponding double electrode layer repulsion of every group of displacing fluid；The A is Hamaker constant；
The h is the water film thickness of target reservoir；The nbFor the ion number density in displacing fluid；The kBFor Boltzmann constant；Institute
Stating T is absolute temperature；The ψr1For the Zeta potential for the two-phase interface that target reservoir crude oil and displacing fluid are constituted；The ψr2For
The Zeta potential for the two-phase interface that displacing fluid and target reservoir rock are constituted；The κ is the Deybe length of displacing fluid.
Further, the acquisition module is obtained also particularly useful for according to the corresponding functional relation of every group of displacing fluid
Take the relationship that the corresponding discrete force of every group of displacing fluid changes with the water film thickness of the target reservoir under the same coordinate system
Curve；And the relation curve changed according to the corresponding discrete force of every group of displacing fluid with the water film thickness of the target reservoir,
Determine first displacing fluid.
Further, the processing module is also used in the acquisition module from the displacing fluid of multiple groups various concentration, obtains
Before taking the first displacing fluid, control solution dilution equipment dilutes target reservoir block stratum according to different extension rates
Water obtains the displacing fluid of multiple groups various concentration.
Further, the processing module controls the water injection equipment according to predetermined period to institute also particularly useful for control
It states target reservoir and injects first displacing fluid, with displacement target crude oil.
Mother oil displacement method and apparatus provided by the invention, by obtaining first from the displacing fluid of multiple groups various concentration
Displacing fluid, and then control water injection equipment and inject above-mentioned first displacing fluid to target reservoir, with displacement target crude oil；Wherein, above-mentioned
The displacing fluid of multiple groups various concentration is the displacing fluid obtained after being diluted to target reservoir block water flooding, and every group of displacing fluid
Corresponding extension rate is different, and above-mentioned first displacing fluid is the corresponding maximum drive of discrete force in above-mentioned multiple groups displacing fluid
For liquid, the corresponding discrete force of above-mentioned every group of displacing fluid is above-mentioned every group of displacing fluid and target reservoir rock, target reservoir crude oil structure
At three phase boundary between discrete force.In this way, since the first displacing fluid is after being diluted to target reservoir block water flooding
Therefore obtained displacing fluid can be used the first displacing fluid and carry out mother oil displacement to high-temperature oil reservoir, further, due to the first drive
It is maximum for the corresponding discrete force of liquid, in this way, recovery ratio can be improved when carrying out mother oil displacement using the first displacing fluid.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is this hair
Bright some embodiments for those of ordinary skill in the art without any creative labor, can be with
It obtains other drawings based on these drawings.
Fig. 1 is the flow chart for the mother oil displacement method that the embodiment of the present invention one provides；
Fig. 2 is the flow chart of mother oil displacement method provided by Embodiment 2 of the present invention；
Fig. 3 is the flow chart for the mother oil displacement method that the embodiment of the present invention three provides；
Fig. 4 is that the corresponding discrete force of every group of displacing fluid becomes with the water film thickness of target reservoir under the same coordinate system got
The relation curve of change；
Fig. 5 is the structural schematic diagram for the mother oil displacement device that the embodiment of the present invention four provides.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
Every other embodiment obtained without creative efforts, shall fall within the protection scope of the present invention.
Mother oil displacement method and apparatus provided by the invention are suitable for high-temperature oil reservoir, the recovery ratio of high-temperature oil reservoir can be improved.
Mother oil displacement method and apparatus provided by the invention, can be applied to oil extraction field, specifically, can will be of the invention
The mother oil displacement method and apparatus of offer are applied to high-temperature oil reservoir, to improve the recovery ratio of high-temperature oil reservoir.
Fig. 1 is the flow chart for the mother oil displacement method that the embodiment of the present invention one provides.The executing subject of the present embodiment can be with
It is individual mother oil displacement device, is also possible to be integrated with the other equipment of mother oil displacement device, the present embodiment is with executing subject
To be illustrated for individual mother oil displacement device.As shown in Figure 1, mother oil displacement method provided in this embodiment, can wrap
It includes:
S101, from the displacing fluid of multiple groups various concentration, obtain the first displacing fluid；Wherein, above-mentioned multiple groups various concentration
Displacing fluid is the displacing fluid obtained after being diluted to target reservoir block water flooding, and the corresponding extension rate of every group of displacing fluid
It is different；Above-mentioned first displacing fluid is the corresponding maximum displacing fluid of discrete force in above-mentioned multiple groups displacing fluid, above-mentioned every group of displacing fluid
Corresponding discrete force be between the three phase boundary that above-mentioned every group of displacing fluid and target reservoir rock, target reservoir crude oil are constituted from
Dissipate power.
It should be noted that the displacing fluid of above-mentioned multiple groups various concentration is to carry out different journeys to target reservoir block water flooding
The displacing fluid obtained after the dilution of degree.For example, respectively by target reservoir block water flooding dilute 10 times, 20 times, 30 times, 40 times,
50 times, obtain the displacing fluid of 5 groups of various concentrations.
Further, rock core displacement reality is carried out in laboratory conditions using the displacing fluid of above-mentioned multiple groups various concentration
It tests, to select the first displacing fluid (tool from the displacing fluid of above-mentioned multiple groups various concentration according to the experimental result of rock core displacement test
Body, by rock core displacement test, that highest group displacing fluid of recovery ratio is determined as the first displacing fluid).It needs to illustrate
It is the discrete force between three phase boundary that the first displacing fluid and target reservoir rock, target reservoir crude oil are constituted compared to other
The discrete force between three phase boundary that several groups of displacing fluids and target reservoir rock, target reservoir crude oil are constituted, the first displacing fluid pair
The discrete force answered is maximum.
S102, control water injection equipment inject above-mentioned first displacing fluid to target reservoir, with displacement target crude oil.
Specifically, in the displacing fluid from multiple groups various concentration, after getting the first displacing fluid, then in this step, control
Water injection equipment processed injects above-mentioned first displacing fluid to target reservoir, to use above-mentioned first displacing fluid displacement target crude oil, makes mesh
Mark crude oil flows to producing well.
It should be noted that since the first displacing fluid is the dilution obtained after being diluted to target reservoir block water flooding
Liquid, in this way, in the later period for carrying out water flooding recovery to target reservoir, it can be by injecting the first displacing fluid to target reservoir, to use
Target crude oil in the further displacement target reservoir of first displacing fluid.Therefore, mother oil displacement method provided in this embodiment, can fit
For high-temperature oil reservoir.Further, and since the first displacing fluid is the corresponding maximum drive of discrete force in above-mentioned multiple groups displacing fluid
For liquid, therefore, when using the first displacing fluid displacement target crude oil, the repulsive force between displacing fluid and target crude oil is larger, can be with
Farthest the target crude oil displacement in target reservoir is come out, improves recovery ratio.
Mother oil displacement method provided in this embodiment, by obtaining the first displacement from the displacing fluid of multiple groups various concentration
Liquid, and then control water injection equipment and inject above-mentioned first displacing fluid to target reservoir, with displacement target crude oil；Wherein, above-mentioned multiple groups
The displacing fluid of various concentration is the displacing fluid obtained after being diluted to target reservoir block water flooding, and every group of displacing fluid is corresponding
Extension rate it is different, and above-mentioned first displacing fluid is the corresponding maximum displacing fluid of discrete force in above-mentioned multiple groups displacing fluid,
The corresponding discrete force of above-mentioned every group of displacing fluid is three that above-mentioned every group of displacing fluid and target reservoir rock, target reservoir crude oil are constituted
Discrete force between phase interface.In this way, since the first displacing fluid is obtained after being diluted to target reservoir block water flooding
Therefore displacing fluid can be used the first displacing fluid and carry out mother oil displacement to high-temperature oil reservoir, further, due to the first displacing fluid pair
The discrete force answered is maximum, in this way, recovery ratio can be improved when carrying out mother oil displacement using the first displacing fluid.
Fig. 2 is mother oil displacement method provided by Embodiment 2 of the present invention.What is involved is how different from multiple groups for the present embodiment
In the displacing fluid of concentration, the detailed process of the first displacing fluid is obtained.Referring to figure 2., on the basis of the above embodiments, step
S101 can specifically include:
S201, according to formula 1:PTot=PVan+PDL, formula 2:PVan=-A/6 π h3:, formula 3:PDL=nbkBT(2ψr1ψr2cosh(kh)-ψr1 2-ψr2 2)/sinh(κh)2, determine the water of above-mentioned every group of displacing fluid corresponding discrete force and above-mentioned target reservoir
Functional relation between film thickness；Wherein, the PTotFor the corresponding discrete force of every group of displacing fluid；The PVanFor every group of displacement
The corresponding Van der Waals force of liquid；The PDLFor the corresponding double electrode layer repulsion of every group of displacing fluid；The A is Hamaker constant；It is described
H is the water film thickness of target reservoir；The nbFor the ion number density in displacing fluid；The kBFor Boltzmann constant；The T
For absolute temperature；The ψr1For the Zeta potential for the two-phase interface that target reservoir crude oil and displacing fluid are constituted；The ψr2For displacement
The Zeta potential for the two-phase interface that liquid and target reservoir rock are constituted；The κ is the Deybe length of displacing fluid.
Specifically, the discrete force between three phase boundary constituted according to colloid-stabilised theory, oil/water/rock is equal to model moral
The sum of magnificent gravitation and double electrode layer repulsion.That is:
PTot=PVan+PDL (1)
Wherein, PTotThe discrete force between three phase boundary constituted for oil/water/rock；
PVanFor Van der Waals force；
PDLFor double electrode layer repulsion.
In this way, if the corresponding Van der Waals force of every group of displacing fluid and the corresponding electric double layer of every group of displacing fluid can be calculated
The corresponding discrete force of every group of displacing fluid can be calculated in repulsion according to formula (1).
Further, the corresponding Van der Waals force of every group of displacing fluid is calculated using formula (2):
PVan=-A/6 π h3 (2)
Wherein, A is Hamaker constant；
H is the water film thickness of target reservoir.
It should be noted that the corresponding Hamaker constant formula (4) of every group of displacing fluid calculates and obtains:
A=3/4kBT((ε1-ε3)/(ε1+ε3))((ε2-ε3)/(ε2+ε3)) (4)
Wherein, ε1The dielectric constant of target reservoir crude oil；
ε2For the dielectric constant of displacing fluid；
ε3For the dielectric constant of target reservoir rock；
It should be noted that the dielectric constant of the displacing fluid of every group of concentration is not for the displacing fluid of multiple groups various concentration
With, in this way, according to the dielectric constant of the displacing fluid of every group of concentration of measuring, target reservoir rock dielectric constant and
The dielectric constant of target crude oil can calculate the corresponding Hamaker constant of every group of displacing fluid using formula (4).When calculating
To after the corresponding Hamaker constant of every group of displacing fluid, and then the corresponding Van der Waals of every group of displacing fluid can be determined according to formula (2)
Functional relation between gravitation and the water film thickness of target reservoir.
Further, the corresponding double electrode layer repulsion P of every group of displacing fluidDLIt is calculated using formula (3):
PDL=nbkBT(2ψr1ψr2cosh(kh)-ψr1 2-ψr2 2)/sinh(κh)2 (3)
Wherein, nbFor the ion number density in displacing fluid；
kBFor Boltzmann constant；
T is absolute temperature, K；
ψr1For the Zeta potential for the two-phase interface that target reservoir crude oil and displacing fluid are constituted；
ψr2For the Zeta potential for the two-phase interface that displacing fluid and target reservoir rock are constituted
κ is the Deybe length of displacing fluid.
Further, the Deybe length of every group of displacing fluid is calculated using formula (5)
Wherein, ρiFor the number of unit volume displacing fluid intermediate ion i；
E is elementary charge institute carried charge；
ziFor the chemical valence of displacing fluid intermediate ion i；
ε0For the electric medium constant in vacuum.
Specifically, it in this step, is made up of the ion of every group of displacing fluid of analysis, Jie of every group of displacing fluid of binding assay
Electric constant, according to formula (5), can calculate every group of displacing fluid Deybe length (after calculating, every group of displacing fluid
Deybe length is a constant), after the Deybe length of every group of displacing fluid is calculated, combining target Reservoir Crude Oil and displacing fluid
The Zeta potential for the two-phase interface that the Zeta potential and displacing fluid of the two-phase interface of composition are constituted with target reservoir rock (needs
Illustrate, the Zeta potential and displacing fluid and target reservoir rock of the two-phase interface that target reservoir crude oil and displacing fluid are constituted
The Zeta potential of the two-phase interface of composition can be determined by experiment), pass through formula 3, it may be determined that it is corresponding to go out every group of displacing fluid
Double electrode layer repulsion and target reservoir water film thickness between functional relation (i.e. in formula (3), only exist one from become
Measure h and dependent variable PDL, other amounts, which can measure either to pass through by experiment, calculates acquisition).In this way, by calculating,
Just the functional relation between the corresponding double electrode layer repulsion of every group of displacing fluid and the water film thickness of target reservoir is obtained.
Further, the function between the corresponding Van der Waals force of every group of displacing fluid and the water film thickness of target reservoir is closed
It is that formula and the corresponding double electrode layer repulsion of every group of displacing fluid are added with the functional relation between the water film thickness of target reservoir, just
Functional relation between the corresponding discrete force of every group of displacing fluid and the water film thickness of target reservoir.
S202, according to the corresponding functional relation of above-mentioned every group of displacing fluid, determine above-mentioned first displacing fluid.
Specifically, after determining every group of displacing fluid corresponding functional relation, in this step, the method for derivation can be passed through
The maximum value of the corresponding functional relation of every group of displacing fluid is calculated, then more every group of displacing fluid corresponding functional relation
Maximum that group of displacing fluid of the maximum value of corresponding functional relation is determined as the first displacing fluid by maximum value.
In the present embodiment, association colloid stable theory determines that every group of displacing fluid is corresponding by formula 1, formula 2, formula 3
Discrete force and target reservoir water film thickness between functional relation, and then according to the corresponding functional relation of every group of displacing fluid
Formula determines the first displacing fluid.In this way, can accurately select the from the displacing fluid of multiple groups various concentration by calculating analysis
One displacing fluid.
Fig. 3 is the flow chart for the mother oil displacement method that the embodiment of the present invention three provides.What is involved is according to every for the present embodiment
The corresponding functional relation of group displacing fluid determines the detailed process of the first displacing fluid.Referring to figure 3., on the basis of above-described embodiment
On, step S202 is specifically included:
S301, according to the corresponding functional relation of above-mentioned every group of displacing fluid, obtain above-mentioned every group of drive under the same coordinate system
The relation curve changed for the corresponding discrete force of liquid with the water film thickness of above-mentioned target reservoir.
Specifically, in this step, the water film thickness of target reservoir is enabled to change from 0nm to 9nm, it is corresponding according to every group of displacing fluid
Functional relation it is thick with the moisture film of above-mentioned target reservoir to draw the corresponding discrete force of every group of displacing fluid under the same coordinate system
Spend the relation curve of variation.
S302, the relationship changed according to the corresponding discrete force of above-mentioned every group of displacing fluid with the water film thickness of above-mentioned target reservoir
Curve determines above-mentioned first displacing fluid.
Specifically, when the pass for drawing out water film thickness variation of the corresponding discrete force of every group of displacing fluid with above-mentioned target reservoir
It is curve, the first displacing fluid can be intuitively selected from image, wherein the maximum value of the corresponding relation curve of the first displacing fluid
Maximum, i.e. the peak value highest of the corresponding relation curve of the first displacing fluid.
The technical solution of the present embodiment is described in detail by taking two groups of displacing fluids as an example below.Specifically, Fig. 4 is shown
The relation curve that the corresponding discrete force of two groups of displacing fluids changes with the water film thickness of target reservoir.Referring to figure 4., wherein curve A
The corresponding relation curve of displacing fluid for being 0 times for extension rate, curve B are the corresponding relationship of displacing fluid that extension rate is 10 times
Curve.Referring to figure 4., with the increase of water film thickness, the corresponding discrete force perseverance of the displacing fluid that extension rate is 0 times is negative value,
The discrete force shows gravitation；The constant corresponding discrete force of the displacing fluid that extension rate is 10 times is positive value, which shows as
Repulsion.In this way, the corresponding displacing fluid of curve B is determined as the first displacing fluid.
Mother oil displacement method provided in this embodiment is determining the first drive according to the corresponding functional relation of every group of displacing fluid
When for liquid, by obtaining above-mentioned every group of displacement under the same coordinate system according to the corresponding functional relation of above-mentioned every group of displacing fluid
The relation curve that the corresponding discrete force of liquid changes with the water film thickness of above-mentioned target reservoir, and then according to above-mentioned every group of displacing fluid pair
The relation curve that the discrete force answered changes with the water film thickness of above-mentioned target reservoir, determines above-mentioned first displacing fluid.In this way, passing through
The corresponding relation curve of every group of displacing fluid under the same coordinate system intuitively, easily, can be selected rapidly from multiple groups displacing fluid
First displacing fluid out.
Further, in inventing a kind of possible implementation, before step S101, the method also includes:
It controls solution dilution equipment and dilutes the target reservoir block water flooding according to different extension rates, obtain multiple groups
The displacing fluid of various concentration.
Specifically, the target reservoir block is diluted on how to control solution dilution equipment according to different extension rates
The detailed process of water flooding may refer to description in the prior art, and details are not described herein again.
Further, in one possible implementation of the present invention, step S102 is specifically included:
It controls above-mentioned water injection equipment and injects above-mentioned first displacing fluid to the target reservoir according to predetermined period, with displacement mesh
Mark crude oil.
In the present embodiment, by periodically injecting the first displacing fluid to target reservoir, can periodically displacement target it is former
Oil stream is to producing well, to further provide for recovery ratio.
Fig. 5 is the structural schematic diagram for the mother oil displacement device that the embodiment of the present invention four provides.The device can by software,
Hardware or the mode of soft or hard combination are realized, and the device can be individual mother oil displacement device, be also possible to be integrated with original
The other equipment of oily driving device.As shown in figure 5, mother oil displacement device provided in this embodiment, comprising: obtain 100 He of module
Processing module 200；Wherein,
Module 100 is obtained, for obtaining the first displacing fluid from the displacing fluid of multiple groups various concentration；Wherein, the multiple groups
The displacing fluid of various concentration is the displacing fluid obtained after being diluted to target reservoir block water flooding, and every group of displacing fluid is corresponding
Extension rate it is different；First displacing fluid is in the multiple groups displacing fluid, and the corresponding maximum displacing fluid of discrete force is described
The corresponding discrete force of every group of displacing fluid is three phase boundaries that every group of displacing fluid and target reservoir rock, target reservoir crude oil are constituted
Discrete force between face；
Processing module 200 injects first displacing fluid to target reservoir for controlling water injection equipment, former with displacement target
Oil.
The device of the present embodiment can be used for executing the technical solution of embodiment of the method shown in Fig. 1, realization principle and skill
Art effect is similar, and details are not described herein again.
Further, module 100 is obtained to be specifically used for according to formula 1:PTot=PVan+PDL, formula 2:PVan=-A/6 π h3、
Formula 3:PDL=nbkBT(2ψr1ψr2cosh(kh)-ψr1 2-ψr2 2)/sinh(κh)2, determine that every group of displacing fluid is corresponding discrete
Functional relation between power and the water film thickness of the target reservoir；And according to the corresponding functional relation of every group of displacing fluid
Formula determines first displacing fluid；Wherein, the PTotFor the corresponding discrete force of every group of displacing fluid；The PVanFor every group of displacement
The corresponding Van der Waals force of liquid；The PDLFor the corresponding double electrode layer repulsion of every group of displacing fluid；The A is Hamaker constant；It is described
H is the water film thickness of target reservoir；The nbFor the ion number density in displacing fluid；The kBFor Boltzmann constant；The T
For absolute temperature；The ψr1For the Zeta potential for the two-phase interface that target reservoir crude oil and displacing fluid are constituted；The ψr2For displacement
The Zeta potential for the two-phase interface that liquid and target reservoir rock are constituted；The κ is the Deybe length of displacing fluid.
The device of the present embodiment can be used for executing the technical solution of embodiment of the method shown in Fig. 2, realization principle and skill
Art effect is similar, and details are not described herein again.
Further, module 100 is obtained to obtain also particularly useful for according to the corresponding functional relation of every group of displacing fluid
Take the relationship that the corresponding discrete force of every group of displacing fluid changes with the water film thickness of the target reservoir under the same coordinate system
Curve；And the relation curve changed according to the corresponding discrete force of every group of displacing fluid with the water film thickness of the target reservoir,
Determine first displacing fluid.
The device of the present embodiment can be used for executing the technical solution of embodiment of the method shown in Fig. 3, realization principle and skill
Art effect is similar, and details are not described herein again.
Further, processing module 200 are also used to obtaining module 100 from the displacing fluid of multiple groups various concentration, obtain
Before first displacing fluid, control solution dilution equipment dilutes the target reservoir block water flooding according to different extension rates,
Obtain the displacing fluid of multiple groups various concentration.
Further, processing module 200 control the water injection equipment according to predetermined period to described also particularly useful for control
Target reservoir injects first displacing fluid, with displacement target crude oil.
Those of ordinary skill in the art will appreciate that: realize that all or part of the steps of above-mentioned each method embodiment can lead to
The relevant hardware of program instruction is crossed to complete.Program above-mentioned can be stored in a computer readable storage medium.The journey
When being executed, execution includes the steps that above-mentioned each method embodiment to sequence；And storage medium above-mentioned include: ROM, RAM, magnetic disk or
The various media that can store program code such as person's CD.
Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Pipe present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: its according to
So be possible to modify the technical solutions described in the foregoing embodiments, or to some or all of the technical features into
Row equivalent replacement；And these are modified or replaceed, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme.
Claims (8)
1. a kind of mother oil displacement method characterized by comprising
From the displacing fluid of multiple groups various concentration, the first displacing fluid is obtained；Wherein, the displacing fluid of the multiple groups various concentration is pair
The displacing fluid that target reservoir block water flooding obtains after being diluted, and the corresponding extension rate of every group of displacing fluid is different；It is described
First displacing fluid is the corresponding maximum displacing fluid of discrete force in multiple groups displacing fluid, the corresponding discrete force of every group of displacing fluid
The discrete force between three phase boundary constituted for every group of displacing fluid and target reservoir rock, target reservoir crude oil；
It controls water injection equipment and injects first displacing fluid to target reservoir, with displacement target crude oil；
Wherein, described from the displacing fluid of multiple groups various concentration, the first displacing fluid is obtained, is specifically included:
According to formula 1:PTot=PVan+PDL, formula 2:PVan=-A/6 π h3, formula 3:PDL=nbkBT(2ψr1ψr2cosh(kh)-
ψr1 2-ψr2 2)/sinh(κh)2, determine between the corresponding discrete force of every group of displacing fluid and the water film thickness of the target reservoir
Functional relation；Wherein, the PTotFor the corresponding discrete force of every group of displacing fluid；The PVanFor the corresponding model of every group of displacing fluid
Moral Hua Yinli；The PDLFor the corresponding double electrode layer repulsion of every group of displacing fluid；The A is Hamaker constant；The h is target oil
The water film thickness of hiding；The nbFor the ion number density in displacing fluid；The kBFor Boltzmann constant；The T is absolutely warm
Degree；The ψr1For the Zeta potential for the two-phase interface that target reservoir crude oil and displacing fluid are constituted；The ψr2For displacing fluid and target
The Zeta potential for the two-phase interface that reservoir rocks are constituted；The κ is the Deybe length of displacing fluid；
According to the corresponding functional relation of every group of displacing fluid, first displacing fluid is determined.
2. the method according to claim 1, wherein described according to the corresponding functional relation of every group of displacing fluid
Formula determines first displacing fluid, specifically includes；
According to the corresponding functional relation of every group of displacing fluid, it is corresponding to obtain every group of displacing fluid under the same coordinate system
The relation curve that discrete force changes with the water film thickness of the target reservoir；
According to the relation curve that the corresponding discrete force of every group of displacing fluid changes with the water film thickness of the target reservoir, determine
First displacing fluid.
3. the method according to claim 1, wherein described from the displacing fluid of multiple groups various concentration, the is obtained
Before one displacing fluid, the method also includes:
It controls solution dilution equipment and dilutes the target reservoir block water flooding according to different extension rates, it is different to obtain multiple groups
The displacing fluid of concentration.
4. method according to claim 1-3, which is characterized in that the control water injection equipment is infused to target reservoir
Enter first displacing fluid to specifically include with displacement target crude oil:
It controls the water injection equipment and injects first displacing fluid to the target reservoir according to predetermined period, it is former with displacement target
Oil.
5. a kind of mother oil displacement device characterized by comprising obtain module and processing module；Wherein, the acquisition module,
For obtaining the first displacing fluid from the displacing fluid of multiple groups various concentration；Wherein, the displacing fluid of the multiple groups various concentration is pair
The displacing fluid that target reservoir block water flooding obtains after being diluted, and the corresponding extension rate of every group of displacing fluid is different；It is described
First displacing fluid is the corresponding maximum displacing fluid of discrete force in multiple groups displacing fluid, the corresponding discrete force of every group of displacing fluid
The discrete force between three phase boundary constituted for every group of displacing fluid and target reservoir rock, target reservoir crude oil；
The processing module injects first displacing fluid to target reservoir for controlling water injection equipment, with displacement target crude oil；
Wherein, the acquisition module is specifically used for according to formula 1:PTot=PVan+PDL, formula 2:PVan=-A/6 π h3, formula 3:
PDL=nbkBT(2ψr1ψr2cosh(kh)-ψr1 2-ψr2 2)/sinh(κh)2, determine the corresponding discrete force of every group of displacing fluid and institute
State the functional relation between the water film thickness of target reservoir；And according to the corresponding functional relation of every group of displacing fluid, really
Fixed first displacing fluid；Wherein, the PTotFor the corresponding discrete force of every group of displacing fluid；The PVanIt is corresponding for every group of displacing fluid
Van der Waals force；The PDLFor the corresponding double electrode layer repulsion of every group of displacing fluid；The A is Hamaker constant；The h is mesh
Mark the water film thickness of oil reservoir；The nbFor the ion number density in displacing fluid；The kBFor Boltzmann constant；The T is absolute
Temperature；The ψr1For the Zeta potential for the two-phase interface that target reservoir crude oil and displacing fluid are constituted；The ψr2For displacing fluid and mesh
Mark the Zeta potential for the two-phase interface that reservoir rocks are constituted；The κ is the Deybe length of displacing fluid.
6. device according to claim 5, which is characterized in that the acquisition module, also particularly useful for according to described every group
The corresponding functional relation of displacing fluid obtains under the same coordinate system the corresponding discrete force of every group of displacing fluid with the target
The relation curve of the water film thickness variation of oil reservoir；And according to the corresponding discrete force of every group of displacing fluid with the target reservoir
The relation curve of water film thickness variation, determines first displacing fluid.
7. device according to claim 5, which is characterized in that the processing module, be also used to the acquisition module from
In the displacing fluid of multiple groups various concentration, before obtaining the first displacing fluid, solution dilution equipment is controlled according to different extension rates
The target reservoir block water flooding is diluted, the displacing fluid of multiple groups various concentration is obtained.
8. according to the described in any item devices of claim 5-7, which is characterized in that the processing module, also particularly useful for control
It controls the water injection equipment and injects first displacing fluid to the target reservoir according to predetermined period, with displacement target crude oil.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1320762A (en) * | 2001-05-14 | 2001-11-07 | 中国石油天然气股份有限公司 | Nm-membrane oil-displacing technique |
| CN105604530A (en) * | 2016-01-22 | 2016-05-25 | 中国石油大学(华东) | System and method for exploiting oil deposit through intelligent displacement |
| CN105628894A (en) * | 2016-01-13 | 2016-06-01 | 西南石油大学 | Simulation and evaluation system for low-salinity water injection experiment and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1320762A (en) * | 2001-05-14 | 2001-11-07 | 中国石油天然气股份有限公司 | Nm-membrane oil-displacing technique |
| CN105628894A (en) * | 2016-01-13 | 2016-06-01 | 西南石油大学 | Simulation and evaluation system for low-salinity water injection experiment and method |
| CN105604530A (en) * | 2016-01-22 | 2016-05-25 | 中国石油大学(华东) | System and method for exploiting oil deposit through intelligent displacement |
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