CN107066672A - A kind of method for numerical simulation of replacement gas drive compositional model - Google Patents
A kind of method for numerical simulation of replacement gas drive compositional model Download PDFInfo
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- 238000004088 simulation Methods 0.000 title claims abstract description 69
- 238000000034 method Methods 0.000 title claims abstract description 27
- 239000012530 fluid Substances 0.000 claims abstract description 59
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- 239000000203 mixture Substances 0.000 claims abstract description 10
- 238000004519 manufacturing process Methods 0.000 claims abstract description 8
- 238000011161 development Methods 0.000 claims description 14
- 230000003993 interaction Effects 0.000 claims description 11
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- 238000011160 research Methods 0.000 description 5
- 238000002474 experimental method Methods 0.000 description 3
- 239000003570 air Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
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- 230000015572 biosynthetic process Effects 0.000 description 1
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- 239000003546 flue gas Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
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- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
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- 238000011084 recovery Methods 0.000 description 1
- 238000009738 saturating Methods 0.000 description 1
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- 230000005514 two-phase flow Effects 0.000 description 1
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- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/166—Injecting a gaseous medium; Injecting a gaseous medium and a liquid medium
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Abstract
The present invention relates to a kind of method for numerical simulation of replacement gas drive compositional model, comprise the following steps：The PVTi fittings of target block fluid are carried out, PVTi fitting fluid properties data are obtained；The component mechanism model set up under different permeabilities, obtains the changing rule in mixed phase region during different permeability oil reservoir gas drive exploitations；Fluid properties data are fitted according to PVTi and build real composition model；The changing rule in mixed phase region, obtains subregion actual numerical value simulation model when being developed according to different permeability oil reservoir gas drives；The mixed phase coefficient in subregion actual numerical value simulation model is adjusted, real composition model is no more than 10% with subregion actual numerical value simulation model production capacity index and the error of pressure index, the rational mixed phase coefficient distribution of target block is obtained；Todd longstaff realistic models are built, are calculated in mixed phase region with Todd longstaff algorithms, are calculated in mixed phase region external application Ordinary Black Oil algorithm.
Description
Technical field
The invention belongs to gas-controlled field development technique field, more particularly to a kind of numerical simulation of replacement gas drive compositional model
Method.
Background technology
Gas drive is one of current important tertiary oil recovery technology formed in the world.The source of the gas species of gas drive is very more,
Including CO2, hydrogen, air, natural gas and flue gas etc..The mechanism of gas drive is extremely complex, while energy is supplemented, a part
Gas can also effectively and physics or chemical reaction occur for in-place oil, so as to effectively improve oil displacement efficiency and swept volume,
This phenomenon is referred to as mixed phase, is driven and non-phase-mixing driving so that gas drive includes mixed phase.
To the gas drive development scheme of mixed phase effect can occur with in-place oil, mould is all typically now carried out using compositional model
Intend.Compositional model can be fine simulated injection fluid and formation fluid in each component balance each other and each phase component property
Change, for the relatively small model of general number of grid, computational accuracy is of a relatively high, is applied at this stage than wide.So
And, in gas drive development process is carried out, even if mean reservoir pressure is higher than miscible pressure, can not also have in the regional area of reservoir
What is imitated reaches mixed phase, therefore the whole district all uses compositional model, and the result predicted in immiscible region domain can be relatively optimistic.Meanwhile, group
Sub-model will reduce 4-10 times or so with respect to black oil simulator arithmetic speed, and with the gradually increase of present model accuracy, grid
Quantity and the quantity of component will be significantly increased, cause arithmetic speed will further decrease.For example, present effective grid 100
Ten thousand, the compositional model that fluid components number is 6 also can be more than 8 more than hour using intersect run times.Therefore need
A kind of New method of numerical simulation of approximate replacement gas drive compositional model is set up, to improve the speed of the computing in gas-drive pool development process
Degree and precision of prediction.
The content of the invention
In view of the above-mentioned problems, it is an object of the invention to provide a kind of method for numerical simulation of replacement gas drive compositional model, can
It is that gas drive exploitation rule is ground under complex mesh model to improve the arithmetic speed and precision of prediction in gas-drive pool development process
Study carefully there is provided key technology means, be particularly suitable for use in the forecasting research of gas drive development effectiveness in oil field development field.
To achieve the above object, the present invention takes following technical scheme：A kind of numerical simulation of replacement gas drive compositional model
Method, comprises the following steps：
1) the PVTi fittings of target block fluid are carried out, PVTi fitting fluid properties data are obtained；
2) well pattern according to target block, is fitted fluid properties data using PVTi, different permeabilities is set up respectively
Under component mechanism model, analyze the change in the mixed phase region of different permeability the following groups point mechanism models, obtain different permeabilities
The changing rule in mixed phase region when oil reservoir gas drive is developed；
3) according to the log data of target block, the component mechanism model similar to actual numerical value simulation model is set up, will
PVTi fitting fluid properties data are imported in the component mechanism model similar to actual numerical value simulation model, build to form actual group
Sub-model；Fluid high-pressure physical parameter is imported in actual numerical value simulation model, and developed according to different permeability oil reservoir gas drives
When mixed phase region changing rule, subregion is carried out to actual numerical value simulation model mixed phase coefficient is set, will be in development process it is mixed
Alpha region sets mixed phase coefficient to be 1, and the region of non-mixed phase sets mixed phase coefficient to be 0, obtains subregion actual numerical value simulation model；It is right
Than the production capacity index and pressure index of real composition model and subregion actual numerical value simulation model, by adjusting subregion actual numerical value
Mixed phase coefficient in simulation model so that real composition model and subregion actual numerical value simulation model production capacity index and pressure index
Error be no more than 10%, now in subregion actual numerical value simulation model mixed phase coefficient distribution be target block reasonably mix
Phase coefficient is distributed；
4) by the rational mixed phase coefficient distribution applications of target block to subregion actual numerical value simulation model, build to be formed
Todd-longstaff realistic models, are calculated in mixed phase region using Todd-longstaff algorithms, in mixed phase region
Outer then use Ordinary Black Oil algorithm is calculated.
The step 1) in PVTi fitting specifically include following steps：
1. the in-place oil component of target block, fluid high-pressure physical parameter are inputted to the PVTi modules of numerical simulation software
In, by adjusting fluid properties data, the stream for the target block that the fluid properties and laboratory physical simulation experiment for making fitting are measured
Volume property matches, and obtains the fluid properties data after initial fitting；
2. according to the fluid properties data after initial fitting, core model is built using numerical simulation software；In rock core mould
Simulated injection gas drive is replaced in type, when pressure be minimum miscibility pressure when, judge the interface of oil and gas tension force in core model whether be
0；If be not zero, the binary interaction coefficient in adjustment fluid properties data repeats simulated injection gas drive in core model
Replace；If the interface of oil and gas tension force in core model is just 0, PVTi fitting fluid properties data now are exported.
The step 1. in fluid properties refer to that fluid bubble point pressure, relative volume coefficient, viscosity, density, expansion are real
Test and minimum miscibility pressure experiment.
OmegaA of the fluid properties data including fluid, OmegaB, critical-temperature, critical pressure, binary interaction system
Number.
The numerical simulation software is Eclipse numerical simulation softwares.
The present invention is due to taking above technical scheme, and it has advantages below：1st, one kind of the invention replaces gas drive component
The method for numerical simulation of model, on the premise of number of grid is larger, the side being combined by using a variety of numerical simulation means
Method, to realize that black oil simulator replaces compositional model, the research for gas drive exploitation rule under complex mesh model provides crucial skill
Art means.2nd, a kind of method for numerical simulation of replacement gas drive compositional model of the invention, gives quantification, exercisable technology
Method and implementation steps, can accurately be rapidly performed by the research that oil reservoir gas drive develops numerical simulation.3rd, a kind of generation of the invention
For the method for numerical simulation of gas drive compositional model, the prediction for being applicable not only to gas-drive pool development effectiveness in oil field development field is ground
Study carefully, while being also applied for water-air two-phase flow drives and handle up the related research of exploitation.
Brief description of the drawings
Fig. 1 is interface of oil and gas tension variation figure in model；
Fig. 2 (a), (b), (c) are the mixed phase regional change that permeability is 5 well patterns in the case of 1mD, 10mD, 30mD respectively
Rule figure；
Fig. 3 (a), (b) are production capacity and the pressure fitting pair of real composition model and subregion actual numerical value simulation model respectively
Than figure.
Embodiment
The present invention is described in detail with reference to the accompanying drawings and examples.
The method of the present invention couples to realize that black oil simulator replaces compositional model using a variety of numerical simulation technology means, can
To be accurately rapidly performed by the research that oil reservoir gas drive develops numerical simulation：PVTi fitting (the i.e. high pressure properties of fluid are carried out first
Experimental fit, P, V, T difference finger pressure, volume and temperature), by adjusting the OmegaA of fluid, OmegaB, critical-temperature, facing
The parameters such as boundary's pressure, binary interaction coefficient, make the fluid bubble point pressure of fitting, relative volume coefficient, viscosity, density, expansion real
Test and minimum miscibility pressure experiment parameter matches with the result that laboratory physical simulation experiment is measured, so as to obtain PVTi fittings
Fluid properties data, include OmegaA, OmegaB, critical-temperature, critical pressure, the binary interaction coefficient etc. of fluid；Then root
Fluid properties data are fitted according to PVTi, (mechanism model is exactly that mesh parameter is to the component mechanism model set up under different permeabilities
Virtual model), the area in different permeability the following group point mechanism model mixed phase regions and the change of mixed phase effect are analyzed, is obtained not
The changing rule in mixed phase region when being developed with permeability oil reservoir gas drive；Mixed phase region when being developed according to different permeability oil reservoir gas drives
Changing rule, actual black oil simulator and compositional model are fitted, the distribution of target block rational mixed phase coefficient is obtained；Most
It is distributed afterwards according to the rational mixed phase coefficient of target block, by actual numerical value simulation model, (actual numerical value simulation model is exactly grid
Parameter is actual architectonic model) gas injection well around can be come out with the region division of mixed phase and assign different mixed phase systems
Number, forms Todd-longstaff realistic models；Todd-longstaff realistic models use Todd- in mixed phase region
Longstaff algorithms are calculated, and are then calculated outside mixed phase region using Ordinary Black Oil algorithm.
A kind of method for numerical simulation of the replacement gas drive compositional model provided according to above-mentioned principle, the present invention, is specifically included
Following steps：
1) the PVTi fittings of target block fluid are carried out, PVTi fitting fluid properties data, including fluid is obtained
OmegaA, OmegaB, critical-temperature, critical pressure, binary interaction coefficient etc..Wherein, binary interaction coefficient represents different fluid
The mixed of component, two kinds of components are more similar, and the value is smaller.
PVTi fittings specifically include following steps：
1. the parameters such as in-place oil component, the high pressure property of the target block that are measured by laboratory physical simulation experiment are inputted
In the PVTi modules of Eclipse numerical simulation softwares, by adjusting the OmegaA of fluid, OmegaB, critical-temperature, critical pressure
The parameters such as power, binary interaction coefficient, make the fluid bubble point pressure of fitting, relative volume coefficient, viscosity, density, swell with
And the fluid properties of target block that the fluid properties such as minimum miscibility pressure experiment are measured with laboratory physical simulation experiment match,
Obtain the fluid properties data after initial fitting, including the OmegaA of fluid, OmegaB, critical-temperature, critical pressure, binary are handed over
The parameters such as mutual coefficient；
2. according to the fluid properties data after initial fitting, core model is built using numerical simulation software；Such as Fig. 1 institutes
Show, simulated injection gas drive is replaced in core model, when pressure is the minimum miscibility pressure that laboratory physical simulation experiment is measured, sentence
Whether the interface of oil and gas tension force in disconnected core model is 0；If be not zero, binary interaction coefficient is adjusted, repeats rock core mould
Simulated injection gas drive is replaced in type；If the interface of oil and gas tension force in core model is just 0, PVTi fitted flows now are exported
Volume property data, including the parameter such as fluid OmegaA, OmegaB, critical-temperature, critical pressure, binary interaction coefficient.
2) as shown in Fig. 2 (a), (b), (c), according to the well pattern of target block, fluid property number is fitted using PVTi
According to the component mechanism model set up respectively under different permeabilities；According to the actual gas drive development situation of target block, analysis is different
The change in the mixed phase regions such as mixed phase area distribution, area and the mixed phase effect of permeability the following group point mechanism model, obtains difference and oozes
The changing rule in mixed phase region during saturating rate oil reservoir gas drive exploitation.
3) according to the log data of target block, the component mechanism model similar to actual numerical value simulation model is set up, will
PVTi fitting fluid properties data are imported in the component mechanism model similar to actual numerical value simulation model, build to form actual group
Sub-model；The fluid high-pressure physical parameter obtained by laboratory physical simulation experiment is imported in actual numerical value simulation model, and root
According to step 2) exploitation of obtained different permeability oil reservoir gas drives when mixed phase region changing rule, actual numerical value simulation model is entered
Row subregion sets mixed phase coefficient, sets mixed phase coefficient to be 1 in the mixed phase region in development process, and the region of non-mixed phase sets mixed phase
Coefficient is 0, obtains subregion actual numerical value simulation model；As shown in Fig. 3 (a), (b), contrast real composition model is actual with subregion
The development effectiveness such as the production capacity index and pressure index of numerical simulator, it is mixed in subregion actual numerical value simulation model by adjusting
Phase coefficient so that the production capacity index and pressure index error of real composition model and subregion actual numerical value simulation model are no more than
10%, the now mixed phase coefficient distribution in subregion actual numerical value simulation model is the rational mixed phase coefficient distribution of target block.
4) by the rational mixed phase coefficient distribution applications of target block to subregion actual numerical value simulation model, build to be formed
Todd-longstaff realistic models, are calculated in mixed phase region using Todd-longstaff algorithms, in mixed phase region
Outer then use Ordinary Black Oil algorithm is calculated.Todd-longstaff realistic models approximately can carry out mould instead of compositional model
Intend, because Todd-longstaff realistic models belong to black oil simulator, therefore its calculating speed will be significantly faster than that compositional model；
And due to step 1) to fitting 3) so that precision is also of a relatively high, the problem of so solving arithmetic speed, while also carrying
High operational precision.
For example, as shown in Fig. 2 (b), mean permeability in 10mD or so, is then pressed in the wellblock in actual numerical value simulation model
Actual numerical value simulation model is divided into some regions by the scope according to mixed phase region in figure, by can be with the region of mixed phase around gas injection well
Mark off and, and the rational mixed phase coefficient distribution of combining target block assigns different mixed phase coefficients, obtains Todd-
Longstaff realistic models, are calculated using Todd-longstaff algorithms in mixed phase region, are then adopted outside mixed phase region
Calculated with Ordinary Black Oil algorithm.
The various embodiments described above are merely to illustrate the present invention, wherein the structure of each part, set location and its connected mode etc.
It can all be varied from, every equivalents carried out on the basis of technical solution of the present invention and improvement should not be arranged
In addition in protection scope of the present invention.
Claims (6)
1. a kind of method for numerical simulation of replacement gas drive compositional model, comprises the following steps：
1) the PVTi fittings of target block fluid are carried out, PVTi fitting fluid properties data are obtained；
2) well pattern according to target block, is fitted fluid properties data using PVTi, sets up respectively under different permeabilities
Component mechanism model, analyzes the change in the mixed phase region of different permeability the following group point mechanism models, obtains different permeability oil reservoirs
The changing rule in mixed phase region when gas drive is developed；
3) according to the log data of target block, the component mechanism model similar to actual numerical value simulation model is set up, by PVTi
It is fitted fluid properties data to import in the component mechanism model similar to actual numerical value simulation model, builds to form real composition mould
Type；Fluid high-pressure physical parameter is imported in actual numerical value simulation model, and mixed when being developed according to different permeability oil reservoir gas drives
The changing rule of alpha region, carries out subregion to actual numerical value simulation model and sets mixed phase coefficient, by the mixed phase area in development process
Domain sets mixed phase coefficient to be 1, and the region of non-mixed phase sets mixed phase coefficient to be 0, obtains subregion actual numerical value simulation model；Contrast is real
The production capacity index and pressure index of border compositional model and subregion actual numerical value simulation model, are simulated by adjusting subregion actual numerical value
Mixed phase coefficient in model so that real composition model and subregion actual numerical value simulation model production capacity index and the mistake of pressure index
Difference is no more than 10%, and now the mixed phase coefficient distribution in subregion actual numerical value simulation model is the rational mixed phase system of target block
Number distribution；
4) by the rational mixed phase coefficient distribution applications of target block to subregion actual numerical value simulation model, build to form Todd-
Longstaff realistic models, are calculated using Todd-longstaff algorithms in mixed phase region, are then adopted outside mixed phase region
Calculated with Ordinary Black Oil algorithm.
2. a kind of method for numerical simulation of replacement gas drive compositional model as claimed in claim 1, it is characterised in that the step
1) the PVTi fittings in specifically include following steps：
1. the in-place oil component of target block, fluid high-pressure physical parameter are inputted in the PVTi modules of numerical simulation software,
By adjusting fluid properties data, the fluidity for the target block that the fluid properties and laboratory physical simulation experiment for making fitting are measured
Matter matches, and obtains the fluid properties data after initial fitting；
2. according to the fluid properties data after initial fitting, core model is built using numerical simulation software；In core model
Simulated injection gas drive is replaced, and when pressure is minimum miscibility pressure, judges whether the interface of oil and gas tension force in core model is 0；Such as
Fruit is not zero, the binary interaction coefficient in adjustment fluid properties data, repeats simulated injection gas drive in core model and replaces；Such as
Interface of oil and gas tension force in fruit core model is just 0, then exports PVTi fitting fluid properties data now.
3. a kind of method for numerical simulation of replacement gas drive compositional model as claimed in claim 2, it is characterised in that the step
1. the fluid properties in refer to fluid bubble point pressure, relative volume coefficient, viscosity, density, swell and minimum mixed phase pressure
Power is tested.
4. a kind of method for numerical simulation of replacement gas drive compositional model as described in claim 1 or 2 or 3, it is characterised in that institute
Stating fluid properties data includes OmegaA, OmegaB, critical-temperature, critical pressure, the binary interaction coefficient of fluid.
5. a kind of method for numerical simulation of replacement gas drive compositional model as described in claim 1 or 2 or 3, it is characterised in that institute
It is Eclipse numerical simulation softwares to state numerical simulation software.
6. a kind of method for numerical simulation of replacement gas drive compositional model as claimed in claim 4, it is characterised in that the numerical value
Simulation softward is Eclipse numerical simulation softwares.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109882161A (en) * | 2019-03-26 | 2019-06-14 | 中国石油化工股份有限公司 | A method of simulation fracture-pore reservoir gas injection gas migration rule |
| CN110516295A (en) * | 2019-07-17 | 2019-11-29 | 中国石油天然气股份有限公司 | A kind of calculating CO2Drive the method for numerical simulation of minimum miscibility pressure |
| CN110598340A (en) * | 2019-09-18 | 2019-12-20 | 中国石油大学(北京) | Method and device for determining gas injection oil displacement experiment fluid |
| CN113343455A (en) * | 2021-05-31 | 2021-09-03 | 清华大学 | Method for constructing physical property calculation model for RP-3 aviation kerosene |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109882161A (en) * | 2019-03-26 | 2019-06-14 | 中国石油化工股份有限公司 | A method of simulation fracture-pore reservoir gas injection gas migration rule |
| CN110516295A (en) * | 2019-07-17 | 2019-11-29 | 中国石油天然气股份有限公司 | A kind of calculating CO2Drive the method for numerical simulation of minimum miscibility pressure |
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| CN110598340A (en) * | 2019-09-18 | 2019-12-20 | 中国石油大学(北京) | Method and device for determining gas injection oil displacement experiment fluid |
| CN110598340B (en) * | 2019-09-18 | 2020-09-01 | 中国石油大学(北京) | Method and device for determining gas injection oil displacement experiment fluid |
| CN113343455A (en) * | 2021-05-31 | 2021-09-03 | 清华大学 | Method for constructing physical property calculation model for RP-3 aviation kerosene |
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