CN105401926A - Petroleum reservoir carbon dioxide miscible flooding pressure prediction method and device - Google Patents
Petroleum reservoir carbon dioxide miscible flooding pressure prediction method and device Download PDFInfo
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Abstract
The invention provides a petroleum reservoir carbon dioxide miscible flooding pressure prediction method and device and relates to the technical field of petroleum reservoir exploitation. The method includes the steps that the basic parameters for predicting petroleum reservoir carbon dioxide miscible flooding pressure are obtained; the solubility parameter of petroleum is determined; petroleum reservoir initial reservoir pressure serves as the trial pressure value, the current trial pressure value and the carbon dioxide density at the petroleum reservoir temperature are determined, and the solubility parameter of the carbon dioxide is determined; the absolute value of the difference of the solubility parameter of the petroleum and the solubility parameter of the carbon dioxide is determined; if the error of the absolute value of the difference and the preset threshold value is smaller than the preset error value, the trial pressure value serves as the minimum petroleum reservoir carbon dioxide miscible flooding pressure; and if the error is larger than or equal to the preset error value, the trial pressure value is adjusted, the updated trial pressure value is formed, the current trial pressure value and the density of the carbon dioxide at the petroleum reservoir temperature are re-determined, and the solubility parameter of the carbon dioxide is re-determined till the error is smaller than the preset error value.
Description
Technical field
The present invention relates to oil reservoir development technical field, particularly relate to a kind of Forecasting Methodology and device of carbon dioxide flooding oil reservoir miscible pressure.
Background technology
At present, at carbon dioxide (CO
2) oil reservoirs development process in, the oil displacement efficiency of driving due to mixed phase is better than the oil displacement efficiency of non-phase-mixing driving, and minimum miscibility pressure is determined to become the key foundation parameter of development response evaluation.Current, measuring is the Main Means of Obtaining Accurate carbon dioxide flooding minimum miscibility pressure, but the flow process of measuring is complicated, elapsed time is longer, and in reservoir selection or Potential Evaluation stage, the method is also inapplicable.
For this problem, prior art has proposed the method being predicted minimum miscibility pressure by some empirical formulas, the main parameter needed comprises reservoir temperature, crude oil molecular weight etc., often needs oil component data in addition.At screening oil reservoir or when carrying out Potential Evaluation, obtain the molecular weight of each oil reservoir block crude oil, component data exist larger difficulty, even a lot of oil reservoir did not do related experiment, therefore a lot of empirical formula is caused to lack corresponding data, and be difficult to application, carbon dioxide flooding oil reservoir minimum miscibility pressure cannot be predicted easily.Therefore, how relying on oil reservoir conventional parameter, fast prediction carbon dioxide flooding oil reservoir minimum miscibility pressure, is a great problem that reservoir selection or carbon dioxide flooding Potential Evaluation face.
Summary of the invention
The embodiment of the present invention provides a kind of Forecasting Methodology and device of carbon dioxide flooding oil reservoir miscible pressure, to solve in prior art the molecular weight, the larger difficulty of component data existence that obtain each oil reservoir block crude oil, a lot of empirical formula lacks corresponding data, is difficult to the problem relying on oil reservoir conventional parameter fast prediction carbon dioxide flooding oil reservoir minimum miscibility pressure.
In order to achieve the above object, the present invention adopts following technical scheme:
A Forecasting Methodology for carbon dioxide flooding oil reservoir miscible pressure, comprising:
The basic parameter of step 101, the described carbon dioxide flooding oil reservoir miscible pressure of acquisition prediction; Described basic parameter comprises: the viscosity of crude under reservoir temperature, oil reservoir original formation pressure and current reservoir condition.
The crude oil molecular weight of step 102, acquisition oil reservoir.
Step 103, according to described crude oil molecular weight and reservoir temperature determination crude oil solubility parameter.
Step 104, with described oil reservoir original formation pressure for tentative calculation force value, determine the carbon dioxide density under current tentative calculation force value and reservoir temperature.
Step 105, according to described carbon dioxide density determination Solubilities of Carbon Dioxide parameter.
Step 106, determine the absolute value of the difference of described crude oil solubility parameter and described Solubilities of Carbon Dioxide parameter, and judge whether the absolute value of described difference and the error of a predetermined threshold value are less than a preset error value.
If the described error of step 107 is less than described preset error value, using described tentative calculation force value as carbon dioxide flooding oil reservoir minimum miscibility pressure.
If the described error of step 108 is more than or equal to described preset error value, adjust described tentative calculation force value, form the tentative calculation force value after upgrading, and redefine the carbon dioxide density under current tentative calculation force value and reservoir temperature, return step 105.
Concrete, the crude oil molecular weight of described acquisition oil reservoir, comprising:
Receive the crude oil molecular weight of the oil reservoir of user's input; Or
According to formula:
Determine the crude oil molecular weight M of described oil reservoir; Wherein, T is described reservoir temperature; μ
ofor viscosity of crude corresponding under described reservoir temperature T condition.
Concrete, described according to described crude oil molecular weight and reservoir temperature determination crude oil solubility parameter, comprising:
According to formula:
δ
oil＝0.02*M+5.15-0.01*(T-25)
Calculate described crude oil solubility parameter δ
oil.
Concrete, according to described carbon dioxide density determination Solubilities of Carbon Dioxide parameter, comprising:
According to formula:
δ
g＝8.5781×10
-3×ρ
g
Calculate described Solubilities of Carbon Dioxide parameter δ
g; Wherein, ρ
gfor described carbon dioxide density.
In addition, described predetermined threshold value is 3; Described preset error value is 0.02.
Concrete, the described tentative calculation force value of described adjustment, forms the tentative calculation force value after upgrading, comprising:
According to formula:
p
i+1＝p
i±0.01MPa
Calculate the tentative calculation force value p after upgrading
i+1; Wherein, p
ifor the tentative calculation force value before renewal.
A prediction unit for carbon dioxide flooding oil reservoir miscible pressure, comprising:
Basic parameter acquiring unit, for obtaining the basic parameter predicting described carbon dioxide flooding oil reservoir miscible pressure; Described basic parameter comprises: the viscosity of crude under reservoir temperature, oil reservoir original formation pressure and current reservoir condition;
Crude oil molecular weight acquiring unit, obtains the crude oil molecular weight of oil reservoir;
Crude oil solubility parameter computing unit, for according to described crude oil molecular weight and reservoir temperature determination crude oil solubility parameter;
Carbon dioxide density determining unit, for described oil reservoir original formation pressure for tentative calculation force value, determine the carbon dioxide density under current tentative calculation force value and reservoir temperature;
Solubilities of Carbon Dioxide parameter determination unit, for according to described carbon dioxide density determination Solubilities of Carbon Dioxide parameter;
Solubility parameter comparing unit, for determining the absolute value of the difference of described crude oil solubility parameter and described Solubilities of Carbon Dioxide parameter, and judges whether the absolute value of described difference and the error of a predetermined threshold value are less than a preset error value;
Carbon dioxide flooding oil reservoir minimum miscibility pressure determining unit, for when described error is less than described preset error value, using described tentative calculation force value as carbon dioxide flooding oil reservoir minimum miscibility pressure;
Tentative calculation force value adjustment unit, for when described error is more than or equal to described preset error value, adjusts described tentative calculation force value, forms the tentative calculation force value after upgrading;
Described carbon dioxide density determining unit, also for redefining the carbon dioxide density under current tentative calculation force value and reservoir temperature.
In addition, described crude oil molecular weight acquiring unit, specifically for:
Receive the crude oil molecular weight of the oil reservoir of user's input; Or
According to formula:
Determine the crude oil molecular weight M of described oil reservoir; Wherein, T is described reservoir temperature; μ
ofor viscosity of crude corresponding under described reservoir temperature T condition.
In addition, described crude oil solubility parameter computing unit, specifically for:
According to formula:
δ
oil＝0.02*M+5.15-0.01*(T-25)
Calculate described crude oil solubility parameter δ
oil.
In addition, described Solubilities of Carbon Dioxide parameter determination unit, specifically for:
According to formula:
δ
g＝8.5781×10
-3×ρ
g
Calculate described Solubilities of Carbon Dioxide parameter δ
g; Wherein, ρ
gfor described carbon dioxide density.
In addition, the predetermined threshold value in described solubility parameter comparing unit is 3; Described preset error value is 0.02.
In addition, described tentative calculation force value adjustment unit, specifically for:
According to formula:
p
i+1＝p
i±0.01MPa
Calculate the tentative calculation force value p after upgrading
i+1; Wherein, p
ifor the tentative calculation force value before renewal.
The Forecasting Methodology of a kind of carbon dioxide flooding oil reservoir miscible pressure that the embodiment of the present invention provides and device, by oil reservoir basic parameter: reservoir temperature, viscosity of crude under oil reservoir original formation pressure and current reservoir condition, crude oil solubility parameter and Solubilities of Carbon Dioxide parameter can be determined, and determine the absolute value of the difference of crude oil solubility parameter and Solubilities of Carbon Dioxide parameter, and by adjusting the mode of tentative calculation force value gradually, thus when the error of this absolute value and predetermined threshold value is less than preset error value, determine that current tentative calculation force value is carbon dioxide flooding oil reservoir minimum miscibility pressure.Like this, the embodiment of the present invention, without the need to obtaining the mass data such as molecular weight, component data of each oil reservoir block crude oil, can be determined carbon dioxide flooding oil reservoir minimum miscibility pressure, can predict carbon dioxide flooding oil reservoir minimum miscibility pressure quickly and easily.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
The flow chart of the Forecasting Methodology of a kind of carbon dioxide flooding oil reservoir miscible pressure that Fig. 1 provides for the embodiment of the present invention;
The structural representation of the prediction unit of a kind of carbon dioxide flooding oil reservoir miscible pressure that Fig. 2 provides for the embodiment of the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
As shown in Figure 1, the Forecasting Methodology of a kind of carbon dioxide flooding oil reservoir miscible pressure that the embodiment of the present invention provides, comprising:
The basic parameter of step 101, acquisition prediction carbon dioxide flooding oil reservoir miscible pressure.
This basic parameter comprises: the viscosity of crude under reservoir temperature, oil reservoir original formation pressure and current reservoir condition.
The crude oil molecular weight of step 102, acquisition oil reservoir.
Concrete, the crude oil molecular weight of this acquisition oil reservoir can be when the crude oil molecular weight of known oil reservoir, directly receives the crude oil molecular weight of the oil reservoir of user's typing; Or when failing directly to know crude oil molecular weight, according to formula:
Determine the crude oil molecular weight M of oil reservoir; Wherein, T is described reservoir temperature; μ
ofor viscosity of crude corresponding under described reservoir temperature T condition.
Step 103, based on crude molecular weight and reservoir temperature determination crude oil solubility parameter.
Herein, can according to formula:
δ
oil＝0.02*M+5.15-0.01*(T-25)
Calculate crude oil solubility parameter δ
oil.
Step 104, with oil reservoir original formation pressure for tentative calculation force value, determine the carbon dioxide density under current tentative calculation force value and reservoir temperature.
In oil reservoir development field, if stressor layer and reservoir temperature definitely, generally can know carbon dioxide density, repeat no more the mode how obtaining carbon dioxide density herein; Carbon dioxide density is relevant with the size of strata pressure herein.
Step 105, according to carbon dioxide density determination Solubilities of Carbon Dioxide parameter.
Herein, can according to formula:
δ
g＝8.5781×10
-3×ρ
g
Calculate Solubilities of Carbon Dioxide parameter δ
g; Wherein, ρ
gfor carbon dioxide density.
Step 106, determine the absolute value of the difference of crude oil solubility parameter and Solubilities of Carbon Dioxide parameter, and judge whether the absolute value of difference and the error of a predetermined threshold value are less than a preset error value.
In addition, this predetermined threshold value can be 3; This preset error value can be 0.02, but is not only confined to this.
If step 107 error is less than preset error value, using tentative calculation force value as carbon dioxide flooding oil reservoir minimum miscibility pressure.
If step 108 error is more than or equal to preset error value, adjustment tentative calculation force value, forms the tentative calculation force value after upgrading, and redefines the carbon dioxide density under current tentative calculation force value and reservoir temperature, return step 105.
Herein, the mode adjusting tentative calculation force value can be according to formula:
p
i+1＝p
i±0.01MPa
Calculate the tentative calculation force value p after upgrading
i+1; Wherein, p
ifor the tentative calculation force value before renewal.
The Forecasting Methodology of a kind of carbon dioxide flooding oil reservoir miscible pressure that the embodiment of the present invention provides, by oil reservoir basic parameter: reservoir temperature, viscosity of crude under oil reservoir original formation pressure and current reservoir condition, crude oil solubility parameter and Solubilities of Carbon Dioxide parameter can be determined, and determine the absolute value of the difference of crude oil solubility parameter and Solubilities of Carbon Dioxide parameter, and by adjusting the mode of tentative calculation force value gradually, thus when the error of this absolute value and predetermined threshold value is less than preset error value, determine that current tentative calculation force value is carbon dioxide flooding oil reservoir minimum miscibility pressure.Like this, the embodiment of the present invention, without the need to obtaining the mass data such as molecular weight, component data of each oil reservoir block crude oil, can be determined carbon dioxide flooding oil reservoir minimum miscibility pressure, can predict carbon dioxide flooding oil reservoir minimum miscibility pressure quickly and easily.
Below in conjunction with a specific embodiment, the present invention is described, embodiment cited below it should be appreciated that is only one in the numerous example of the present invention, and and the example of not all.
In certain block of Xinjiang Oilfield, buried depth 4000m, original formation pressure 29.52MPa in the middle part of known reservoir oil layer, reservoir temperature is 105 DEG C, saturation pressure 22.16MPa, oil viscosity 1.3mPa.s; It should be noted that and do not know the data message such as oil component, crude oil molecular weight herein.
Adopt the present invention to carry out the prediction of carbon dioxide flooding oil reservoir minimum miscibility pressure to only there being this block of basic parameter, concrete process can be:
(1) known reservoir temperature 105 DEG C, oil viscosity 1.3mPa.s, oil reservoir original formation pressure 29.52MPa, the density of this temperature, pressure condition carbon dioxide is 629.6kg/m
3.
(2) according to formula:
Calculating determines that crude oil molecular weight is 167; Wherein, μ
ofor viscosity of crude 1.3mPa.s; T is reservoir temperature 105 DEG C.
(3) with oil reservoir original formation pressure 29.52MPa for tentative calculation force value, according to formula:
δ
oil＝0.02*M+5.15-0.01*(T-25)；
Calculate crude oil solubility parameter δ
oilbe 7.69, according to formula:
δ
g＝8.5781×10
-3×ρ
g；
Calculate Solubilities of Carbon Dioxide parameter δ
gbe 5.40, such crude oil solubility parameter δ
oilwith Solubilities of Carbon Dioxide δ
gdifference between parameter is 2.29.Herein, ρ
gfor carbon dioxide density.
(4) absolute value of the difference between crude oil solubility parameter herein and Solubilities of Carbon Dioxide parameter is 2.29, be 0.71 with the error of predetermined threshold value 3, be far longer than preset error value 0.02, like this on original formation pressure value basis, increase respectively or reduce 0.01MPa, repeating above-mentioned steps (3) and carry out tentative calculation; Until when the difference between crude oil solubility parameter and Solubilities of Carbon Dioxide parameter approximates 3, proceed to following step (5).Herein, difference between crude oil solubility parameter and Solubilities of Carbon Dioxide parameter approximates 3, refer to that the absolute value of the difference between crude oil solubility parameter and Solubilities of Carbon Dioxide parameter is in 2.98 ~ 3.02 scopes, can change in right amount this span as the case may be in practical application.
(5) as strata pressure value 24.35MPa, Solubilities of Carbon Dioxide parameter is 4.70, and the absolute value of the difference between crude oil solubility parameter is 2.99, meet the requirement in above-mentioned steps (4), this block carbon dioxide flooding oil reservoir minimum miscibility pressure namely predicted in this example is 24.35MPa.
Corresponding to the embodiment of the method shown in above-mentioned Fig. 1, the embodiment of the present invention also provides a kind of prediction unit of carbon dioxide flooding oil reservoir miscible pressure, as shown in Figure 2, comprising:
Basic parameter acquiring unit 21, can obtain the basic parameter of prediction carbon dioxide flooding oil reservoir miscible pressure.
Basic parameter comprises: the viscosity of crude under reservoir temperature, oil reservoir original formation pressure and current reservoir condition;
Crude oil molecular weight acquiring unit 22, obtains the crude oil molecular weight of oil reservoir.
Crude oil solubility parameter computing unit 23, can based on crude molecular weight and reservoir temperature determination crude oil solubility parameter.
Carbon dioxide density determining unit 24, with oil reservoir original formation pressure for tentative calculation force value, and can determine the carbon dioxide density under current tentative calculation force value and reservoir temperature.
Solubilities of Carbon Dioxide parameter determination unit 25, can according to carbon dioxide density determination Solubilities of Carbon Dioxide parameter.
Solubility parameter comparing unit 26, can determine the absolute value of the difference of crude oil solubility parameter and Solubilities of Carbon Dioxide parameter, and judges whether the absolute value of difference and the error of a predetermined threshold value are less than a preset error value.
Carbon dioxide flooding oil reservoir minimum miscibility pressure determining unit 27, can when error be less than preset error value, using tentative calculation force value as carbon dioxide flooding oil reservoir minimum miscibility pressure.
Tentative calculation force value adjustment unit 28, can when error be more than or equal to preset error value, and adjustment tentative calculation force value, forms the tentative calculation force value after upgrading.
Carbon dioxide density determining unit 24, can also redefine the carbon dioxide density under current tentative calculation force value and reservoir temperature.
In addition, crude oil molecular weight acquiring unit 22, specifically can receive the crude oil molecular weight of the oil reservoir of user's input; Or according to formula:
Determine the crude oil molecular weight M of oil reservoir; Wherein, T is described reservoir temperature; μ
ofor viscosity of crude corresponding under described reservoir temperature T condition.
In addition, crude oil solubility parameter computing unit 23, specifically can according to formula:
δ
oil＝0.02*M+5.15-0.01*(T-25)
Calculate crude oil solubility parameter δ
oil.
In addition, Solubilities of Carbon Dioxide parameter determination unit 25, specifically can according to formula:
δ
g＝8.5781×10
-3×ρ
g
Calculate Solubilities of Carbon Dioxide parameter δ
g; Wherein, ρ
gfor carbon dioxide density.
In addition, the predetermined threshold value in solubility parameter comparing unit 26 is 3; Preset error value is 0.02.
In addition, tentative calculation force value adjustment unit 28, specifically can according to formula:
p
i+1＝p
i±0.01MPa
Calculate the tentative calculation force value p after upgrading
i+1; Wherein, p
ifor the tentative calculation force value before renewal.
What deserves to be explained is, the specific implementation of the prediction unit of a kind of carbon dioxide flooding oil reservoir miscible pressure that the embodiment of the present invention provides see the embodiment of the method shown in above-mentioned Fig. 1, can repeat no more herein.
The prediction unit of a kind of carbon dioxide flooding oil reservoir miscible pressure that the embodiment of the present invention provides, by oil reservoir basic parameter: reservoir temperature, viscosity of crude under oil reservoir original formation pressure and current reservoir condition, crude oil solubility parameter and Solubilities of Carbon Dioxide parameter can be determined, and determine the absolute value of the difference of crude oil solubility parameter and Solubilities of Carbon Dioxide parameter, and by adjusting the mode of tentative calculation force value gradually, thus when the error of this absolute value and predetermined threshold value is less than preset error value, determine that current tentative calculation force value is carbon dioxide flooding oil reservoir minimum miscibility pressure.Like this, the embodiment of the present invention, without the need to obtaining the mass data such as molecular weight, component data of each oil reservoir block crude oil, can be determined carbon dioxide flooding oil reservoir minimum miscibility pressure, can predict carbon dioxide flooding oil reservoir minimum miscibility pressure quickly and easily.
Apply specific embodiment in the present invention to set forth principle of the present invention and embodiment, the explanation of above embodiment just understands method of the present invention and core concept thereof for helping; Meanwhile, for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (12)
1. a Forecasting Methodology for carbon dioxide flooding oil reservoir miscible pressure, is characterized in that, comprising:
The basic parameter of step 101, the described carbon dioxide flooding oil reservoir miscible pressure of acquisition prediction; Described basic parameter comprises: the viscosity of crude under reservoir temperature, oil reservoir original formation pressure and current reservoir condition;
The crude oil molecular weight of step 102, acquisition oil reservoir;
Step 103, according to described crude oil molecular weight and reservoir temperature determination crude oil solubility parameter;
Step 104, with described oil reservoir original formation pressure for tentative calculation force value, determine the carbon dioxide density under current tentative calculation force value and reservoir temperature;
Step 105, according to described carbon dioxide density determination Solubilities of Carbon Dioxide parameter;
Step 106, determine the absolute value of the difference of described crude oil solubility parameter and described Solubilities of Carbon Dioxide parameter, and judge whether the absolute value of described difference and the error of a predetermined threshold value are less than a preset error value;
If the described error of step 107 is less than described preset error value, using described tentative calculation force value as carbon dioxide flooding oil reservoir minimum miscibility pressure;
If the described error of step 108 is more than or equal to described preset error value, adjust described tentative calculation force value, form the tentative calculation force value after upgrading, and redefine the carbon dioxide density under current tentative calculation force value and reservoir temperature, return step 105.
2. the Forecasting Methodology of carbon dioxide flooding oil reservoir miscible pressure according to claim 1, is characterized in that, the crude oil molecular weight of described acquisition oil reservoir, comprising:
Receive the crude oil molecular weight of the oil reservoir of user's input; Or
According to formula:
Determine the crude oil molecular weight M of described oil reservoir; Wherein, T is described reservoir temperature; μ
ofor viscosity of crude corresponding under described reservoir temperature T condition.
3. the Forecasting Methodology of carbon dioxide flooding oil reservoir miscible pressure according to claim 2, is characterized in that, described according to described crude oil molecular weight and reservoir temperature determination crude oil solubility parameter, comprising:
According to formula:
δ
oil＝0.02*M+5.15-0.01*(T-25)
Calculate described crude oil solubility parameter δ
oil.
4. the Forecasting Methodology of carbon dioxide flooding oil reservoir miscible pressure according to claim 3, is characterized in that, according to described carbon dioxide density determination Solubilities of Carbon Dioxide parameter, comprising:
According to formula:
δ
g＝8.5781×10
-3×ρ
g
Calculate described Solubilities of Carbon Dioxide parameter δ
g; Wherein, ρ
gfor described carbon dioxide density.
5. the Forecasting Methodology of carbon dioxide flooding oil reservoir miscible pressure according to claim 1, is characterized in that, described predetermined threshold value is 3; Described preset error value is 0.02.
6. the Forecasting Methodology of carbon dioxide flooding oil reservoir miscible pressure according to claim 1, is characterized in that, the described tentative calculation force value of described adjustment, forms the tentative calculation force value after upgrading, comprising:
According to formula:
p
i+1＝p
i±0.01MPa
Calculate the tentative calculation force value p after upgrading
i+1; Wherein, p
ifor the tentative calculation force value before renewal.
7. a prediction unit for carbon dioxide flooding oil reservoir miscible pressure, is characterized in that, comprising:
Basic parameter acquiring unit, for obtaining the basic parameter predicting described carbon dioxide flooding oil reservoir miscible pressure; Described basic parameter comprises: the viscosity of crude under reservoir temperature, oil reservoir original formation pressure and current reservoir condition;
Crude oil molecular weight acquiring unit, obtains the crude oil molecular weight of oil reservoir;
Crude oil solubility parameter computing unit, for according to described crude oil molecular weight and reservoir temperature determination crude oil solubility parameter;
Carbon dioxide density determining unit, for described oil reservoir original formation pressure for tentative calculation force value, determine the carbon dioxide density under current tentative calculation force value and reservoir temperature;
Solubilities of Carbon Dioxide parameter determination unit, for according to described carbon dioxide density determination Solubilities of Carbon Dioxide parameter;
Solubility parameter comparing unit, for determining the absolute value of the difference of described crude oil solubility parameter and described Solubilities of Carbon Dioxide parameter, and judges whether the absolute value of described difference and the error of a predetermined threshold value are less than a preset error value;
Carbon dioxide flooding oil reservoir minimum miscibility pressure determining unit, for when described error is less than described preset error value, using described tentative calculation force value as carbon dioxide flooding oil reservoir minimum miscibility pressure;
Tentative calculation force value adjustment unit, for when described error is more than or equal to described preset error value, adjusts described tentative calculation force value, forms the tentative calculation force value after upgrading;
Described carbon dioxide density determining unit, also for redefining the carbon dioxide density under current tentative calculation force value and reservoir temperature.
8. the prediction unit of carbon dioxide flooding oil reservoir miscible pressure according to claim 7, is characterized in that, described crude oil molecular weight acquiring unit, specifically for:
Receive the crude oil molecular weight of the oil reservoir of user's input; Or
According to formula:
Determine the crude oil molecular weight M of described oil reservoir; Wherein, T is described reservoir temperature; μ
ofor viscosity of crude corresponding under described reservoir temperature T condition.
9. the prediction unit of carbon dioxide flooding oil reservoir miscible pressure according to claim 8, is characterized in that, described crude oil solubility parameter computing unit, specifically for:
According to formula:
δ
oil＝0.02*M+5.15-0.01*(T-25)
Calculate described crude oil solubility parameter δ
oil.
10. the prediction unit of carbon dioxide flooding oil reservoir miscible pressure according to claim 9, is characterized in that, described Solubilities of Carbon Dioxide parameter determination unit, specifically for:
According to formula:
δ
g＝8.5781×10
-3×ρ
g
Calculate described Solubilities of Carbon Dioxide parameter δ
g; Wherein, ρ
gfor described carbon dioxide density.
The prediction unit of 11. carbon dioxide flooding oil reservoir miscible pressure according to claim 7, it is characterized in that, the predetermined threshold value in described solubility parameter comparing unit is 3; Described preset error value is 0.02.
The prediction unit of 12. carbon dioxide flooding oil reservoir miscible pressure according to claim 7, is characterized in that, described tentative calculation force value adjustment unit, specifically for:
According to formula:
p
i+1＝p
i±0.01MPa
Calculate the tentative calculation force value p after upgrading
i+1; Wherein, p
ifor the tentative calculation force value before renewal.
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| CN106021778A (en) * | 2016-05-31 | 2016-10-12 | 中国海洋石油总公司 | Method for determining CO2 simulation displacement performance miscibility pressure |
| CN106021778B (en) * | 2016-05-31 | 2019-04-09 | 中国海洋石油集团有限公司 | A kind of simulation CO2The determination method of displacement dynamic miscible pressure |
| CN106156439A (en) * | 2016-07-20 | 2016-11-23 | 中国石油大学(华东) | A kind of heavy crude reservoir dissolved gas drive method for numerical simulation with foam oil phenomenon |
| CN106156439B (en) * | 2016-07-20 | 2018-03-13 | 中国石油大学(华东) | A kind of heavy crude reservoir dissolved gas drive method for numerical simulation with foam oil phenomenon |
| CN108952648B (en) * | 2018-08-30 | 2020-11-06 | 陕西延长石油(集团)有限责任公司研究院 | Minimum miscible pressure calculation method for carbon dioxide and formation crude oil in Ordos basin |
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