CN107066672B - Numerical simulation method for replacing gas drive component model - Google Patents
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- 238000004088 simulation Methods 0.000 title claims abstract description 67
- 238000000034 method Methods 0.000 title claims abstract description 25
- 239000012530 fluid Substances 0.000 claims abstract description 63
- 230000035699 permeability Effects 0.000 claims abstract description 21
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- 230000008859 change Effects 0.000 claims abstract description 16
- 238000004422 calculation algorithm Methods 0.000 claims abstract description 12
- 239000003921 oil Substances 0.000 claims description 24
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- 238000006073 displacement reaction Methods 0.000 claims description 7
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- 230000000704 physical effect Effects 0.000 claims description 5
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- 238000004364 calculation method Methods 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- -1 Hydrogen Chemical class 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000003570 air Substances 0.000 description 1
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- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention relates to a numerical simulation method for replacing a gas drive component model, which comprises the following steps: performing PVTi fitting on the fluid in the target block to obtain PVTi fitting fluid property data; establishing component mechanism models under different permeabilities to obtain the change rule of a miscible region during gas drive development of oil reservoirs with different permeabilities; building an actual component model according to the PVTi fitting fluid property data; obtaining a partitioned actual numerical simulation model according to the change rule of a miscible region during gas drive development of oil reservoirs with different permeabilities; adjusting the miscible coefficients in the partitioned actual numerical simulation model to ensure that the error between the actual component model and the partitioned actual numerical simulation model is not more than 10 percent and the error between the capacity index and the pressure index of the partitioned actual numerical simulation model is not more than 10 percent, so as to obtain reasonable miscible coefficient distribution of the target block; and (3) building a Todd-longstaff actual model, calculating by using a Todd-longstaff algorithm in a miscible region, and calculating by using a common black oil algorithm outside the miscible region.
Description
Technical Field
The invention belongs to the technical field of gas drive oilfield development, and particularly relates to a numerical simulation method for replacing a gas drive component model.
Background
Gas flooding is one of the important tertiary oil recovery technologies that have been developed in the world today. The gas sources of gas flooding are very diverse and comprise CO2Hydrogen, air, natural gas, and flue gas, among others. The mechanism of gas flooding is very complex, and when energy is supplemented, a part of gas can also effectively perform physical or chemical reaction with formation crude oil, so that the oil displacement efficiency and swept volume are effectively improved, the phenomenon is called miscible, and the gas flooding comprises miscible flooding and immiscible flooding.
Gas drive development modes capable of generating miscible action with formation crude oil are currently simulated by adopting a component model. The component model can finely simulate the phase balance of each component in the injected fluid and the formation fluid and the property change of each phase component, has relatively high calculation precision aiming at a model with relatively small grid number, and is relatively widely applied at the present stage. However, in the process of gas drive development, even if the average pressure of the reservoir is higher than the miscible pressure, the miscible phase cannot be effectively achieved in a local region of the reservoir, so that the compositional model is adopted in the whole region, and the result of prediction in a non-miscible region is relatively optimistic. Meanwhile, the operation speed of the component model relative to the black oil model is reduced by about 4-10 times, and along with the gradual increase of the precision of the current model, the number of grids and the number of components are greatly increased, so that the operation speed is further reduced. For example, the component model with 1 million effective grids and 6 fluid components can have an intersector operation time of more than 8 hours. Therefore, a new numerical simulation method approximately replacing a gas drive component model needs to be established to improve the operation speed and the prediction precision in the gas drive reservoir development process.
Disclosure of Invention
In view of the above problems, the present invention aims to provide a numerical simulation method replacing a gas drive component model, which can improve the operation speed and the prediction precision in the gas drive reservoir development process, provide a key technical means for the research of the gas drive development rule under a complex grid model, and is particularly suitable for the prediction research of the gas drive development effect in the field of oil field development.
In order to achieve the purpose, the invention adopts the following technical scheme: a numerical simulation method for replacing a gas drive component model comprises the following steps:
1) performing PVTi fitting on the fluid in the target block to obtain PVTi fitting fluid property data;
2) respectively establishing component mechanism models under different permeabilities by using PVTi to fit fluid property data according to a development well pattern of a target block, and analyzing the change of a miscible region of the component mechanism models under different permeabilities to obtain the change rule of the miscible region during gas drive development of oil reservoirs with different permeabilities;
3) establishing a component mechanism model similar to the actual numerical simulation model according to the logging data of the target block, introducing the PVTi fitting fluid property data into the component mechanism model similar to the actual numerical simulation model, and establishing to form the actual component model; introducing fluid high-pressure physical parameters into an actual numerical simulation model, partitioning the actual numerical simulation model according to the change rule of a miscible region during gas drive development of oil reservoirs with different permeabilities to set a miscible coefficient, setting the miscible coefficient to be 1 in the miscible region in the development process, and setting the miscible coefficient to be 0 in an unmiscible region to obtain a partitioned actual numerical simulation model; comparing the capacity index and the pressure index of the actual component model and the partitioned actual numerical simulation model, and adjusting the miscible coefficient in the partitioned actual numerical simulation model to ensure that the error between the capacity index and the pressure index of the actual component model and the partitioned actual numerical simulation model is not more than 10 percent, wherein the miscible coefficient distribution in the partitioned actual numerical simulation model is the reasonable miscible coefficient distribution of the target block;
4) and applying reasonable miscible coefficient distribution of the target block to a partitioned actual numerical simulation model, constructing to form a Todd-longstaff actual model, calculating by adopting a Todd-longstaff algorithm in a miscible region, and calculating by adopting a common black oil algorithm outside the miscible region.
The fitting of PVTi in step 1) specifically comprises the following steps:
① inputting the stratum crude oil component and fluid high-pressure physical property parameter of the target block into a PVTi module of numerical simulation software, and adjusting the fluid property data to make the fitted fluid property coincide with the fluid property of the target block measured by an indoor physical simulation experiment, so as to obtain the fluid property data after preliminary fitting;
②, according to the preliminarily fitted fluid property data, using numerical simulation software to construct a core model, simulating injected gas displacement in the core model, judging whether the oil-gas interface tension in the core model is 0 when the pressure is the minimum miscible phase pressure, adjusting the binary interaction coefficient in the fluid property data if the pressure is not zero, repeatedly simulating injected gas displacement in the core model, and if the oil-gas interface tension in the core model is just 0, deriving the PVTi fitting fluid property data at the moment.
The fluid properties in step ① refer to fluid bubble point pressure, relative volume factor, viscosity, density, expansion experiments, and minimum miscible pressure experiments.
The fluid property data includes omega A, omega B, critical temperature, critical pressure, binary interaction coefficient of the fluid.
The numerical simulation software is Eclipse numerical simulation software.
Due to the adoption of the technical scheme, the invention has the following advantages: 1. according to the numerical simulation method for replacing the gas drive component model, on the premise of large grid number, the black oil model is used for replacing the component model by using a method combining various numerical simulation means, and a key technical means is provided for the research of the gas drive development rule under the complex grid model. 2. The numerical simulation method for replacing the gas drive component model provides a quantitative and operable technical method and implementation steps, and can accurately and quickly research on numerical simulation of reservoir gas drive development. 3. The numerical simulation method for replacing the gas drive component model is not only suitable for the prediction research of the gas drive reservoir development effect in the field of oil field development, but also suitable for the research related to the gas-water alternative drive and huff-puff development.
Drawings
FIG. 1 is a graph of the field of change in interfacial tension of oil and gas in a model;
FIG. 2(a), (b), (c) are the miscible region variation law diagrams of the 5-point well pattern under the condition of permeability of 1mD, 10mD and 30mD respectively;
FIGS. 3(a) and (b) are graphs comparing the performance and pressure fit of the actual composition model and the partitioned actual numerical simulation model, respectively.
Detailed Description
The invention is described in detail below with reference to the figures and examples.
The method of the invention utilizes coupling of various numerical simulation technical means to realize that the black oil model replaces the component model, and can accurately and rapidly research the numerical simulation of the oil reservoir gas drive development: firstly, carrying out PVTi fitting (namely high-pressure physical property experiment fitting, P, V, T respectively indicates pressure, volume and temperature) of a fluid, and enabling fitted fluid bubble point pressure, relative volume coefficient, viscosity, density, expansion experiment and minimum miscible pressure experiment parameters to be matched with results measured by an indoor physical simulation experiment by adjusting parameters of the fluid such as omega A, omega B, critical temperature, critical pressure, binary interaction coefficient and the like, so as to obtain PVTi fitting fluid property data including omega A, omega B, critical temperature, critical pressure, binary interaction coefficient and the like of the fluid; then, according to PVTi fitting fluid property data, establishing component mechanism models (the mechanism models are models with virtual grid parameters) under different permeabilities, analyzing the areas of miscible regions of the component mechanism models under different permeabilities and the change of miscible effects, and obtaining the change rule of the miscible regions during gas drive development of oil reservoirs with different permeabilities; fitting an actual black oil model with the component model according to the change rule of a miscible region during gas drive development of oil reservoirs with different permeabilities to obtain reasonable miscible coefficient distribution of a target block; finally, according to reasonable miscible coefficient distribution of the target block, dividing miscible areas around the gas injection well of an actual numerical simulation model (the actual numerical simulation model is a model with grid parameters as an actual geological structure) and endowing different miscible coefficients to form a Todd-longstaff actual model; and the Todd-longstaff actual model is calculated in a miscible region by adopting a Todd-longstaff algorithm, and the model is calculated outside the miscible region by adopting a common black oil algorithm.
According to the principle, the numerical simulation method for replacing the gas drive component model specifically comprises the following steps of:
1) and carrying out PVTi fitting on the fluid in the target block to obtain PVTi fitting fluid property data, wherein the PVTi fitting fluid property data comprise the omega A and omega B of the fluid, the critical temperature, the critical pressure, the binary interaction coefficient and the like. Where a binary interaction coefficient indicates the ability of different fluid components to mix, the more similar the two components, the smaller the value.
The PVTi fitting specifically comprises the following steps:
①, inputting parameters such as stratum crude oil components, high-pressure physical properties and the like of a target block measured by an indoor physical simulation experiment into a PVTi module of Eclipse numerical simulation software, and enabling fluid properties such as fitted fluid bubble point pressure, relative volume coefficient, viscosity, density, expansion experiment and minimum miscible pressure experiment to be matched with fluid properties of the target block measured by the indoor physical simulation experiment by adjusting parameters such as omega A, omega B, critical temperature, critical pressure, binary interaction coefficient and the like of a fluid to obtain preliminarily fitted fluid property data including parameters such as omega A, omega B, critical temperature, critical pressure, binary interaction coefficient and the like of the fluid;
②, according to the fluid property data after preliminary fitting, using numerical simulation software to construct a core model, as shown in figure 1, simulating injected gas displacement in the core model, judging whether the oil-gas interface tension in the core model is 0 when the pressure is the minimum miscible pressure measured by an indoor physical simulation experiment, if not, adjusting a binary interaction coefficient, repeatedly performing the simulated injected gas displacement in the core model, and if the oil-gas interface tension in the core model is just 0, deriving the PVTi fitting fluid property data at the moment, including parameters such as fluid omega A, omega B, critical temperature, critical pressure, binary interaction coefficient and the like.
2) As shown in fig. 2(a), (b), and (c), according to the developed well pattern of the target block, the PVTi is used to fit the fluid property data, and the component mechanism models under different permeabilities are respectively established; and analyzing the change of the miscible region such as the distribution, the area, the miscible effect and the like of the miscible region of the component mechanism model under different permeabilities according to the actual gas drive development condition of the target block to obtain the change rule of the miscible region during the gas drive development of the oil reservoirs with different permeabilities.
3) Establishing a component mechanism model similar to the actual numerical simulation model according to the logging data of the target block, introducing the PVTi fitting fluid property data into the component mechanism model similar to the actual numerical simulation model, and establishing to form the actual component model; introducing fluid high-pressure physical property parameters obtained by an indoor physical simulation experiment into an actual numerical simulation model, sectionally setting a miscible coefficient for the actual numerical simulation model according to the change rule of the miscible region in the gas drive development of the oil reservoirs with different permeabilities obtained in the step 2), setting the miscible coefficient to be 1 in the miscible region in the development process, and setting the miscible coefficient to be 0 in the immiscible region to obtain a sectionally actual numerical simulation model; as shown in fig. 3(a) and (b), by comparing development effects such as the performance index and the pressure index of the actual component model and the partitioned actual numerical simulation model, and adjusting the miscible coefficients in the partitioned actual numerical simulation model, the error between the performance index and the pressure index of the actual component model and the partitioned actual numerical simulation model is not more than 10%, and at this time, the miscible coefficient distribution in the partitioned actual numerical simulation model is the reasonable miscible coefficient distribution of the target block.
4) And applying reasonable miscible coefficient distribution of the target block to a partitioned actual numerical simulation model, constructing to form a Todd-longstaff actual model, calculating by adopting a Todd-longstaff algorithm in a miscible region, and calculating by adopting a common black oil algorithm outside the miscible region. The Todd-longstaff actual model can approximately replace the component model to carry out simulation, and the Todd-longstaff actual model belongs to a black oil model, so the calculation speed of the Todd-longstaff actual model is obviously faster than that of the component model; and due to the fitting of the steps 1) to 3), the precision is relatively high, so that the problem of the operation speed is solved, and the operation precision is improved.
For example, as shown in fig. 2(b), if the average permeability in the well in the actual numerical simulation model is about 10mD, the actual numerical simulation model is divided into a plurality of regions according to the range of the miscible region in the graph, the region around the gas injection well that can be miscible is divided, different miscible coefficients are given in combination with the reasonable miscible coefficient distribution of the target block, so as to obtain a Todd-longstaff actual model, a Todd-longstaff algorithm is used for calculation in the miscible region, and a normal black oil algorithm is used for calculation outside the miscible region.
The above embodiments are only used for illustrating the present invention, and the structure, the arrangement position, the connection mode, and the like of each component can be changed, and all equivalent changes and improvements based on the technical scheme of the present invention should not be excluded from the protection scope of the present invention.
Claims (5)
1. A numerical simulation method for replacing a gas drive component model comprises the following steps:
1) performing PVTi fitting on the fluid in the target block to obtain PVTi fitting fluid property data;
2) respectively establishing component mechanism models under different permeabilities by using PVTi to fit fluid property data according to a development well pattern of a target block, and analyzing the change of a miscible region of the component mechanism models under different permeabilities to obtain the change rule of the miscible region during gas drive development of oil reservoirs with different permeabilities;
3) establishing a component mechanism model with the same seepage parameters as the actual numerical simulation model according to the logging data of the target block, introducing the PVTi fitting fluid property data into the component mechanism model with the same seepage parameters as the actual numerical simulation model, and building to form the actual component model; introducing fluid high-pressure physical parameters into an actual numerical simulation model, partitioning the actual numerical simulation model according to the change rule of a miscible region during gas drive development of oil reservoirs with different permeabilities to set a miscible coefficient, setting the miscible coefficient to be 1 in the miscible region in the development process, and setting the miscible coefficient to be 0 in an unmiscible region to obtain a partitioned actual numerical simulation model; comparing the capacity index and the pressure index of the actual component model and the partitioned actual numerical simulation model, and adjusting the miscible coefficient in the partitioned actual numerical simulation model to ensure that the error between the capacity index and the pressure index of the actual component model and the partitioned actual numerical simulation model is not more than 10 percent, wherein the miscible coefficient distribution in the partitioned actual numerical simulation model is the reasonable miscible coefficient distribution of the target block;
4) and applying reasonable miscible coefficient distribution of the target block to a partitioned actual numerical simulation model, constructing to form a Todd-longstaff actual model, calculating by adopting a Todd-longstaff algorithm in a miscible region, and calculating by adopting a common black oil algorithm outside the miscible region.
2. A numerical simulation method replacing a gas drive component model according to claim 1, wherein the PVTi fitting in step 1) specifically comprises the steps of:
according to the preliminarily fitted fluid property data, constructing a rock core model by using numerical simulation software; simulating injected gas displacement in the rock core model, and judging whether the oil-gas interface tension in the rock core model is 0 or not when the pressure is the minimum miscible phase pressure; if not, adjusting the fluid property numberAccording to the binary interaction coefficient, repeatedly simulating the displacement of the injected gas in the rock core model; if the oil-gas interfacial tension in the core model is just 0, then the PVTi fitting fluid property data at this time is derived.
3. A numerical simulation method replacing a gas drive component model according to claim 2, characterized in that the steps areThe fluid properties in (1) refer to fluid bubble point pressure, relative volume coefficient, viscosity, density, expansion experiment and minimum miscible pressure experiment.
4. A numerical simulation method replacing a gas flooding component model according to claim 1, 2 or 3, characterized in that said fluid property data comprises the omega a, omega b, critical temperature, critical pressure, binary interaction coefficient of the fluid.
5. A numerical simulation method for replacing a gas drive component model according to claim 2 or 3, wherein the numerical simulation software is Eclipse numerical simulation software.
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| CN110516295B (en) * | 2019-07-17 | 2021-09-28 | 中国石油天然气股份有限公司 | Calculating CO2Numerical simulation method for driving minimum miscible pressure |
| 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 |
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