CN107101773A - Bubble point pressure and the method for testing and test device for intending bubble point pressure - Google Patents
Bubble point pressure and the method for testing and test device for intending bubble point pressure Download PDFInfo
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- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L11/00—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00
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Abstract
The embodiment of the present application discloses bubble point pressure and intends the method for testing and test device of bubble point pressure.The bubble point pressure method of testing includes：After porous media sample is dried and loads measurement container, the first CT scan image of the porous media sample is obtained；To the measurement container injection foam oil, it is the first preset value to make the pressure value in the measurement container, and obtains the second CT scan image of the porous media sample；The pressure value in the measurement container is gradually reduced, untill the pressure value in the measurement container is the second preset value；And at least one the 3rd CT scan image of the porous media sample is obtained during pressure value is gradually reduced；Based on the first CT scan image, the second CT scan image and at least one described the 3rd CT scan image, the bubble point pressure of foam oil in the porous media sample is determined.
Description
Technical field
The application is related to petroleum gas technical field, more particularly to a kind of bubble point pressure and the survey for intending bubble point pressure
Method for testing and test device.
Background technology
The viscous crude resource very abundant in the areas such as China, Canada and Venezuela.Part heavy crude reservoir was being exploited
Continuous foam state is presented in output oil in journey, wherein containing a large amount of stable minute bubbles.It is foam oil that people, which deserve to be called and state output oil,.
A large amount of production practices show, due to the presence of foam oil phenomenon, the recovery ratio of the more conventional dissolved gas drive reservoir of such heavy crude reservoir
5-25% is higher by, rate of oil production is higher by 10-30 times, even as high as 100 times had.Therefore, the mechanism of research foam oil is for carrying
The recovery ratio of high viscous oil oil reservoir is most important.
Porous media is widely present in heavy crude reservoir.For example, sandstone and mud stone etc..Therefore, in research foam oil machine
During reason, the bubble point pressure of foam oil and plan bubble point pressure are the important ginsengs of one needed to be grasped in porous media
Number.
In the prior art, the bubble point pressure of foam oil is directly generally tested using PVT instruments and intends bubble point pressure, and
Using the bubble point pressure measured as foam oil in porous media bubble point pressure, using the plan bubble point pressure measured as many
The plan bubble point pressure of foam oil in the medium of hole.But, the test process of above-mentioned prior art does not have the participation of porous media.It is logical
Chang Di, the intermolecular active force of oil gas is different from the intermolecular active force of porous media.Therefore, above-mentioned prior art test is obtained
Bubble point pressure can not truly reflect the bubble point pressure of foam oil in porous media.Similarly, above-mentioned prior art test
Obtained plan bubble point pressure also can not truly reflect the plan bubble point pressure of foam oil in porous media.It is badly in need of at present a kind of accurate
The method for testing the bubble point pressure of foam oil and plan bubble point pressure in porous media to true property.
The content of the invention
The purpose of the embodiment of the present application is to provide a kind of bubble point pressure and intends bubble point pressure method of testing and test dress
Put, to test the bubble point pressure of foam oil and plan bubble point pressure in porous media exactly.
To achieve the above object, the embodiment of the present application provides a kind of bubble point pressure method of testing, including：It is situated between by porous
Quality sample is dried and loaded after measurement container, obtains the first CT scan image of the porous media sample；Hold to the measurement
Device injects foam oil, and it is the first preset value to make the pressure value in the measurement container, and obtains the of the porous media sample
Two CT scan images；The pressure value in the measurement container is gradually reduced, until the pressure value in the measurement container is second
Untill preset value；And at least one the 3rd CT scan of the porous media sample is obtained during pressure value is gradually reduced
Image；Based on the first CT scan image, the second CT scan image and at least one described the 3rd CT scan figure
Picture, determines the bubble point pressure of foam oil in the porous media sample.
To achieve the above object, the embodiment of the present application provides a kind of plan bubble point pressure method of testing, including：Will be porous
Dielectric sample is dried and loaded after measurement container, obtains the first CT scan image of the porous media sample；To the measurement
Container injects foam oil, and it is the first preset value to make the pressure value in the measurement container, and obtains the porous media sample
Second CT scan image；The pressure value in the measurement container is gradually reduced, until the pressure value in the measurement container is the
Untill two preset values；And at least one the 3rd CT of the porous media sample is obtained during pressure value is gradually reduced sweep
Trace designs picture；Based on the first CT scan image, the second CT scan image and at least one described the 3rd CT scan figure
Picture, determines the plan bubble point pressure of foam oil in the porous media sample.
To achieve the above object, the embodiment of the present application provides a kind of bubble point pressure test device, including：First CT scan
Image acquisition unit, for after porous media sample is dried and loads measurement container, obtaining described porous by CT scan
First CT scan image of dielectric sample；Second CT scan image acquisition unit, for injecting foam oil to the measurement container,
It is the first preset value to make the pressure value in the measurement container；And the 2nd CT of the porous media sample is obtained by CT scan
Scan image；3rd CT scan image acquisition unit, for gradually reducing the pressure value in the measurement container, until described survey
Untill the pressure value measured in container is the second preset value；And obtain described porous by CT scan during reduction pressure value is obtained
At least one the 3rd CT scan image of dielectric sample；Bubble point pressure determining unit, for based on the first CT scan figure
Picture, the second CT scan image and at least one described the 3rd CT scan image, determine to steep in the porous media sample
The bubble point pressure of foam oil.
To achieve the above object, the embodiment of the present application provides a kind of plan bubble point pressure test device, including：First CT is swept
Image acquisition unit is retouched, for after porous media sample is dried and loads measurement container, obtaining described many by CT scan
First CT scan image of hole dielectric sample；Second CT scan image acquisition unit, for injecting foam to the measurement container
Oil, it is the first preset value to make the pressure value in the measurement container；And obtain the of the porous media sample by CT scan
Two CT scan images；3rd CT scan image acquisition unit, for gradually reducing the pressure value in the measurement container, until institute
Untill the pressure value stated in measurement container is the second preset value；And obtain described by CT scan during reduction pressure value is obtained
At least one the 3rd CT scan image of porous media sample；Intend bubble point pressure determining unit, for based on the first CT
Scan image, the second CT scan image and at least one described the 3rd CT scan image, determine the porous media sample
The plan bubble point pressure of foam oil in product.
The technical scheme provided from above the embodiment of the present application, the embodiment of the present application can pass through porous media sample
CT scan image, test in the porous media sample bubble point pressure of foam oil and intend bubble point pressure.With existing skill
Art is compared, and the embodiment of the present application has the participation of porous media during test, so as to accurately obtain porous media
The bubble point pressure and plan bubble point pressure of middle foam oil oil.
Brief description of the drawings
, below will be to embodiment or existing in order to illustrate more clearly of the embodiment of the present application or technical scheme of the prior art
There is the accompanying drawing used required in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments described in application, for those of ordinary skill in the art, are not paying the premise of creative labor
Under, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is a kind of flow chart of bubble point pressure method of testing of the embodiment of the present application；
Fig. 2 is a kind of flow chart for intending bubble point pressure method of testing of the embodiment of the present application；
Fig. 3 is a kind of oil saturation curve of frequency distribution schematic diagram of CT scan image of the embodiment of the present application；
Fig. 4 a are a kind of CT scan image schematic diagram of the embodiment of the present application；
Fig. 4 b are another CT scan image schematic diagram of the embodiment of the present application；
Fig. 4 c are another CT scan image schematic diagram of the embodiment of the present application；
Fig. 4 d are another CT scan image schematic diagram of the embodiment of the present application；
Fig. 4 e are another CT scan image schematic diagram of the embodiment of the present application；
Fig. 4 f are another CT scan image schematic diagram of the embodiment of the present application；
Fig. 4 g are another CT scan image schematic diagram of the embodiment of the present application；
Fig. 4 h are another CT scan image schematic diagram of the embodiment of the present application；
Fig. 5 is a kind of illustrative view of functional configuration of bubble point pressure test device of the embodiment of the present application；
Fig. 6 is a kind of illustrative view of functional configuration for intending bubble point pressure test device of the embodiment of the present application.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present application, the technical scheme in the embodiment of the present application is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only some embodiments of the present application, rather than whole embodiments.It is based on
Embodiment in the application, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, should all belong to the scope of the application protection.
In dissolved gas drive recovery process, mobility and the compressibility increase of viscous crude are that foam state is presented in viscous crude
Reason.Generally it regard the minimum formation pressure value for making viscous crude that continuous foam state is presented as bubble point pressure.Also, locality lamination
When force value is less than the bubble point pressure, the solution gas in viscous crude can be separated out in the form of spreading gas, and formation moves freely gas phase,
Untill lower value formation pressure.In this way, generally regarding the value formation pressure spread when gas stops separating out as plan bubble point pressure
Force value.
CT (Computed Tomography, CT scan) scannings are used as a kind of lossless visualization skill
Art, can apply to the test of the bubble point pressure of foam oil and plan bubble point pressure in porous media.Refer to Fig. 1.This Shen
Please a kind of bubble point pressure method of testing of embodiment offer.Methods described comprises the following steps.
Step S11：After porous media sample is dried and loads measurement container, the of the porous media sample is obtained
One CT scan image.
In the present embodiment, the porous media sample can be sample of sandstone, mudstone sample, sandpack column sample etc..
The measurement container can be core holding unit.Certainly, the measurement container can also be other any vessels.For example, back-up sand
Pipe.
In the present embodiment, porous media sample can be dried by tester and loads measurement container.Certainly,
Porous media sample can also be dried by other main bodys and load measurement container.For example, computer etc..
In the present embodiment, CT instruments can be used to be scanned the porous media sample, porous Jie is obtained
The scan image of quality sample, and it regard obtained scan image as the first CT scan image.The CT instruments include but is not limited to
Medical CT instruments etc..
Step S12：To the measurement container injection foam oil, the pressure value in the measurement container is set to be preset for first
Value, and obtain the second CT scan image of the porous media sample.
In the present embodiment, first preset value will be generally greater than or equal to the bubble of foam oil in the porous media sample
Force value is pressed, is specifically as follows any real number.For example, the porous media sample can be sample of sandstone, described first presets
Value can be 7MPa.First preset value can be empirical value.Certainly, first preset value can also pass through other methods
Test is obtained.
In the present embodiment, the size phase that the size of the second CT scan image can be with the first CT scan image
Together.For example, the size of the second CT scan image and the first CT scan image can be the pixels of 512 pixel * 512.
In the present embodiment, can be by injection pump to the measurement container injection foam oil, until the measurement container
Untill the pressure value of interior foam oil is the first preset value.In this way, the porous media sample can be with saturated foam oil.Alternatively,
Can also be to the measurement container vacuum-pumping, so that the porous media sample is under vacuum state；And after evacuation, to
The measurement container injection foam oil.
In the present embodiment, the mode phase that the mode of the second CT scan image of acquisition can be with the first CT scan image of acquisition
It is similar.The two, which can be compareed, explains, and will not be repeated here.
Step S13：The pressure value in the measurement container is gradually reduced, until the pressure value in the measurement container is the
Untill two preset values；And at least one the 3rd CT of the porous media sample is obtained during pressure value is gradually reduced sweep
Trace designs picture.
In the present embodiment, second preset value is typically less than or equal to the plan of foam oil in the porous media sample
Bubble point pressure, is specifically as follows any real number.For example, can be 0MPa.Second preset value can be empirical value.When
So, second preset value can also be obtained by the test of other methods.The size of the 3rd CT scan image can be with institute
The size for stating the first CT scan image is identical.
In the present embodiment, can specifically be obtained using following sub-step the porous media sample at least one the 3rd
CT scan image.
Step a：Make the pressure value reduction designated value in the measurement container, obtain the 3rd CT of the porous media sample
Scan image.
In the present embodiment, the designated value can flexibly be set according to actual needs.For example, can be 0.2MPa.
In the present embodiment, the pressure value reduction designated value in the measurement container can be made by control valve；And institute
The pressure for stating foam oil in measurement container is reached after balance, can obtain the 3rd CT scan image of the porous media sample.
Obtain the 3rd CT scan image mode can with obtain the first CT scan image mode it is similar.The two can compare progress
Explain, will not be repeated here.
Step b：Repeat step a, untill the pressure value in the measurement container is the second preset value.
In the present embodiment, repeat step a, untill the pressure value in the measurement container is the second preset value.Such as
This, can obtain one or more 3rd CT scan images.
Step S14：Based on the first CT scan image, the second CT scan image and it is described at least one
Three CT scan images, determine the bubble point pressure of foam oil in the porous media sample.
In the present embodiment, as it was previously stated, the first CT scan image, the second CT scan image and described
At least one the 3rd CT scan image, can be of the same size.In this way, at least one described the 3rd CT scan image
In each 3rd CT scan image, can be based on the CT values of each pixel, described second in the first CT scan image
In CT scan image in the CT values and the 3rd CT scan image of each pixel each pixel CT values, calculate the 3rd
The oil saturation value of each pixel in CT scan image.Specifically, formula can be used
Calculate the oil saturation value of each pixel in the 3rd CT scan image.Wherein, So,iFor picture in the 3rd CT scan image
Vegetarian refreshments i oil saturation value So；CTx,iFor the CT values of pixel i in the 3rd CT scan image；CTdry,iFor the first CT scan
Pixel i CT values in image；CTwet,iFor the CT values of pixel i in the second CT scan image.
In this way, can be based on each pixel in each 3rd CT scan image at least one described the 3rd CT scan image
The oil saturation value of point, determines the bubble point pressure of foam oil in the porous media sample.Specifically, for it is described at least
Each 3rd CT scan image in one the 3rd CT scan image, can be based on each pixel in the 3rd CT scan image
Oil saturation value, obtain the oil saturation distributive law of the 3rd CT scan image；Can based on it is described at least one the
The oil saturation distributive law of each 3rd CT scan image in three CT scan images, determines foam in the porous media sample
The bubble point pressure of oil.
For example, for each 3rd CT scan image at least one described the 3rd CT scan image, this can be obtained
The oil saturation value of each pixel in 3rd CT scan image, it is possible to count the corresponding pixel of each oil saturation value
Point quantity；The corresponding pixel quantity of each oil saturation value can be based on, the oil saturation of the CT scan image is drawn
Curve of frequency distribution.It is possible to from the oil saturation curve of frequency distribution of at least one the 3rd CT scan image,
It is chosen at least one the oil saturation curve of frequency distribution for not having monotonicity in interval of definition；Can be by described at least one
The set of the corresponding 3rd CT scan image composition of individual oil saturation curve of frequency distribution, is used as the 3rd CT scan image set
Close.
As it was previously stated, after the pressure value in measurement container often reduces designated value, the porous media sample can be obtained
The a 3rd CT scan image.In this way, each 3rd CT scan image can correspond to a measurement container pressure value.So,
The 3rd maximum CT scan image of correspondence measurement container pressure value can be chosen from the 3rd CT scan image collection, as
The CT scan image of first object the 3rd；Can by the CT scan image of first object the 3rd it is corresponding measurement container pressure value,
It is used as the bubble point pressure of foam oil in the porous media sample.
The embodiment of the present application can be tested in the porous media sample and steeped by the CT scan image of porous media sample
The bubble point pressure of foam oil.Compared with prior art, the embodiment of the present application has the participation of porous media during test, from
And the bubble point pressure of foam oil in porous media can be tested with accuracy.
Refer to Fig. 2.The embodiment of the present application also provides a kind of plan bubble point pressure method of testing.Methods described includes as follows
Step.
Step S21：After porous media sample is dried and loads measurement container, the of the porous media sample is obtained
One CT scan image.
Step S22：To the measurement container injection foam oil, the pressure value in the measurement container is set to be preset for first
Value, and obtain the second CT scan image of the porous media sample.
Step S23：The pressure value in the measurement container is gradually reduced, until the pressure value in the measurement container is the
Untill two preset values；And at least one the 3rd CT of the porous media sample is obtained during pressure value is gradually reduced sweep
Trace designs picture.
Step S24：Based on the first CT scan image, the second CT scan image and it is described at least one
Three CT scan images, determine the plan bubble point pressure of foam oil in the porous media sample.
In the present embodiment, the first CT scan image, the second CT scan image and it is described at least one
Three CT scan images, can be of the same size.In this way, for each at least one described the 3rd CT scan image
Three CT scan images, can be based on the CT values of each pixel, the second CT scan image in the first CT scan image
In each pixel CT values and the CT values of each pixel in the 3rd CT scan image, calculate the 3rd CT scan figure
The oil saturation value of each pixel as in.Specific calculating process is referred to the step S14 of previous embodiment.
In this way, can be based on each pixel in each 3rd CT scan image at least one described the 3rd CT scan image
The oil saturation value of point, determines the plan bubble point pressure of foam oil in the porous media sample.Specifically, for it is described extremely
Each 3rd CT scan image in a few 3rd CT scan image, can be based on each pixel in the 3rd CT scan image
The oil saturation value of point, obtains the oil saturation distributive law of the 3rd CT scan image；Can based on it is described at least one
The oil saturation distributive law of each 3rd CT scan image in 3rd CT scan image, determines to steep in the porous media sample
The plan bubble point pressure of foam oil.
For example, for each 3rd CT scan image at least one described the 3rd CT scan image, this can be obtained
The oil saturation value of each pixel in 3rd CT scan image, it is possible to count the corresponding pixel of each oil saturation value
Point quantity；The corresponding pixel quantity of each oil saturation value can be based on, the oil saturation of the CT scan image is drawn
Curve of frequency distribution.It is possible to from the oil saturation curve of frequency distribution of at least one the 3rd CT scan image,
It is chosen at least one the oil saturation curve of frequency distribution for not having monotonicity in interval of definition；Can be by described at least one
The corresponding 3rd CT scan image of individual oil saturation curve of frequency distribution is used as the 3rd CT scan image collection.
As it was previously stated, after the pressure value in measurement container often reduces designated value, the porous media sample can be obtained
The a 3rd CT scan image.In this way, each 3rd CT scan image can correspond to a measurement container pressure value.So,
The 3rd maximum CT scan image of correspondence measurement container pressure value can be chosen from the 3rd CT scan image collection, as
The CT scan image of first object the 3rd；Can be bent by the oil saturation frequency distribution of the CT scan image of first object the 3rd
Line, as with reference to oil saturation curve of frequency distribution；Can be by the corresponding measurement of the CT scan image of first object the 3rd
Container pressure value, is used as reference pressure value；Corresponding measurement container pressure can be chosen from the 3rd CT scan image collection
Force value is less than the reference pressure value and the extreme point quantity of oil saturation curve and the reference oil saturation frequency
3rd CT scan image in the CT scan image collection of son the 3rd that distribution curve is differed, the sub 3rd CT scan image collection
Quantity can be one or more；Oil saturation frequency distribution can be chosen from the sub 3rd CT scan image collection
3rd CT scan image of the oil saturation value maximum corresponding to the peak value of curve, is used as the CT scan figure of the second target the 3rd
Picture；The oil saturation distributive law value of the CT scan image of the second target the 3rd can be regard as the porous media sample
The plan bubble point pressure of middle foam oil.
The embodiment of the present application can be tested in the porous media sample and steeped by the CT scan image of porous media sample
The plan bubble point pressure of foam oil.Compared with prior art, the embodiment of the present application has the participation of porous media during test,
The plan bubble point pressure of foam oil in porous media is tested so as to accuracy.
The embodiment of the present application bubble point pressure introduced below and the concrete application for intending bubble point pressure method of testing
Scape.In the application scenarios, the porous media sample can be sandpack column sample.The hole of the sandpack column sample
Degree can be 36.5%, and air permeability can be 5541mD.The viscosity of the foam oil can be 6151cp.Described first is pre-
If value can be 7MPa.Second preset value can be 3MPa.The designated value can be 0.2MPa.
In this way, after the sandpack column sample is dried and loads fill out sand tube, the sandpack column sample can be obtained
The first CT scan image.Foam oil can be injected to the fill out sand tube, it is 7MPa to make the pressure value in the fill out sand tube, and can
To obtain the second CT scan image of the sandpack column sample.The pressure value in the fill out sand tube can be gradually reduced, until
Untill pressure value in the fill out sand tube is 3MPa.Specifically, 0.2MPa, and the foam in the fill out sand tube can be reduced every time
The pressure of oil is reached after balance, obtains the 3rd CT scan image of the sandpack column sample.In this way, 20 the 3rd can be obtained
CT scan image.It can be swept based on the first CT scan image, the second CT scan image and 20 the 3rd CT
Trace designs picture, determines the bubble point pressure of foam oil and plan bubble point pressure in the porous media sample.
For example, Fig. 3 be fill out sand tube in pressure value be respectively 6.8MPa, 6.0MPa, 5.6MPa, 5.2MPa, 4.4MPa,
When 4MPa, 3.6MPa and 3MPa, the oil saturation curve of frequency distribution schematic diagram of each the 3rd CT scan image is corresponded to.
The abscissa of the oil saturation curve of frequency distribution is oil saturation value, and ordinate is oil saturation value respective pixel
Point quantity accounts for the percentage of total pixel quantity in the 3rd CT scan image.Fig. 4 a are that the pressure value in fill out sand tube is 6.8MPa
When, the 3rd CT scan image schematic diagram of correspondence.When Fig. 4 b are that pressure value in fill out sand tube is 6.0MPa, the 3rd CT scan figure of correspondence
As schematic diagram.When Fig. 4 c are that pressure value in fill out sand tube is 5.6MPa, the 3rd CT scan image schematic diagram of correspondence.Fig. 4 d are back-up sand
When pressure value in pipe is 5.2MPa, the 3rd CT scan image schematic diagram of correspondence.Fig. 4 e are that the pressure value in fill out sand tube is
During 4.4MPa, the 3rd CT scan image schematic diagram of correspondence.When Fig. 4 f are that pressure value in fill out sand tube is 4MPa, the 3rd CT of correspondence is swept
Tracing is as schematic diagram.When Fig. 4 g are that pressure value in fill out sand tube is 3.6MPa, the 3rd CT scan image schematic diagram of correspondence.Fig. 4 h are
When pressure value in fill out sand tube is 3MPa, the 3rd CT scan image schematic diagram of correspondence.
From the figure 3, it may be seen that the pressure value in fill out sand tube be respectively 5.6MPa, 5.2MPa, 4.4MPa, 4MPa, 3.6MPa and
During 3MPa, the oil saturation curve of frequency distribution of each the 3rd CT scan image is corresponded to, without dullness in interval of definition
Property.It is possible to using 5.6MPa as foam oil in the sandpack column sample bubble point pressure.
When can be 5.6MPa by the pressure value in fill out sand tube, the oil saturation frequency point of the 3rd CT scan image of correspondence
Cloth curve, as with reference to oil saturation curve of frequency distribution；Pressure value 5.6MPa can be regard as reference pressure value；Can be from
When pressure value in fill out sand tube is respectively 5.6MPa, 5.2MPa, 4.4MPa, 4MPa, 3.6MPa and 3MPa, it is corresponding each
In 3rd CT scan image, choose corresponding measurement container pressure value and be less than the reference pressure value and correspondence oil-containing saturation
Write music the 3rd CT scan image that the quantity of line extreme point and the reference oil saturation curve of frequency distribution differ, so that
When the pressure value obtained in fill out sand tube is respectively 4.4MPa, 4MPa, 3.6MPa and 3MPa, each corresponding the 3rd CT scan
Image.When pressure value in fill out sand tube is respectively 4.4MPa, 4MPa, 3.6MPa and 3MPa, each corresponding the 3rd CT is swept
Tracing is as in, the oil saturation curve of frequency distribution of the 3rd CT scan image of correspondence when the pressure value in fill out sand tube is 4MPa
Oil saturation value corresponding to peak value is maximum (that is, peak value is most kept right).It is possible to regard 4MPa as the porous media sample
The plan bubble point pressure of foam oil in product.
Refer to Fig. 5.The embodiment of the present application also provides a kind of bubble point pressure test device.Including：
First CT scan image acquisition unit 51, for after porous media sample is dried and loads measurement container, leading to
Cross the first CT scan image that CT scan obtains the porous media sample；
Second CT scan image acquisition unit 52, for the measurement container injection foam oil, making the measurement container
Interior pressure value is the first preset value；And the second CT scan image of the porous media sample is obtained by CT scan；
3rd CT scan image acquisition unit 53, for gradually reducing the pressure value in the measurement container, until described
Untill the pressure value measured in container is the second preset value；And obtain described many by CT scan during reduction pressure value is obtained
At least one the 3rd CT scan image of hole dielectric sample；
Bubble point pressure determining unit 54, for based on the first CT scan image, the second CT scan image, with
And at least one described the 3rd CT scan image, determine the bubble point pressure of foam oil in the porous media sample.
Refer to Fig. 6.The embodiment of the present application also provides a kind of bubble point pressure test device.Including：
First CT scan image acquisition unit 51, for after porous media sample is dried and loads measurement container, leading to
Cross the first CT scan image that CT scan obtains the porous media sample；
Second CT scan image acquisition unit 52, for the measurement container injection foam oil, making the measurement container
Interior pressure value is the first preset value；And the second CT scan image of the porous media sample is obtained by CT scan；
3rd CT scan image acquisition unit 53, for gradually reducing the pressure value in the measurement container, until described
Untill the pressure value measured in container is the second preset value；And obtain described many by CT scan during reduction pressure value is obtained
At least one the 3rd CT scan image of hole dielectric sample；
Intend bubble point pressure determining unit 61, for based on the first CT scan image, the second CT scan image,
And at least one described the 3rd CT scan image, determine the bubble point pressure of foam oil in the porous media sample.
Although depicting the application by embodiment, it will be appreciated by the skilled addressee that the application have it is many deformation and
Change is without departing from spirit herein, it is desirable to which appended claim includes these deformations and changed without departing from the application's
Spirit.
Claims (16)
1. a kind of bubble point pressure method of testing, it is characterised in that including：
After porous media sample is dried and loads measurement container, the first CT scan figure of the porous media sample is obtained
Picture；
To the measurement container injection foam oil, it is the first preset value to make the pressure value in the measurement container, and obtains described
Second CT scan image of porous media sample；
The pressure value in the measurement container is gradually reduced, until the pressure value in the measurement container is that the second preset value is
Only；And at least one the 3rd CT scan image of the porous media sample is obtained during pressure value is gradually reduced；
Based on the first CT scan image, the second CT scan image and at least one described the 3rd CT scan image,
Determine the bubble point pressure of foam oil in the porous media sample.
2. the method as described in claim 1, it is characterised in that the acquisition porous media sample at least one the 3rd
CT scan image, including：
Step a：Make the pressure value reduction designated value in the measurement container, obtain the 3rd CT scan of the porous media sample
Image；
Step b：Repeat step a, untill the pressure value in the measurement container is the second preset value.
3. the method as described in claim 1, it is characterised in that the bubble point pressure of foam oil in the determination porous media
Value, including：
For each 3rd CT scan image at least one described the 3rd CT scan image, based on the first CT scan figure
Each CT values and the 3rd CT scan figure of pixel in the CT values of each pixel, the second CT scan image as in
The CT values of each pixel, calculate the oil saturation value of each pixel in the 3rd CT scan image as in；
Oil-containing saturation based on each pixel in each 3rd CT scan image at least one described the 3rd CT scan image
Angle value, determines the bubble point pressure of foam oil in the porous media sample.
4. method as claimed in claim 3, it is characterised in that each pixel in the CT scan image of calculating the 3rd
Oil saturation value, including：
Using formulaCalculate the oil-containing saturation of each pixel in the 3rd CT scan image
Angle value；Wherein,
So,iFor the oil saturation value S of pixel i in the 3rd CT scan imageo；
CTx,iFor the CT values of pixel i in the 3rd CT scan image；
CTdry,iFor the CT values of pixel i in the first CT scan image；
CTwet,iFor the CT values of pixel i in the second CT scan image.
5. method as claimed in claim 3, it is characterised in that the bubble point of foam oil in the determination porous media sample
Pressure value, including：
For each 3rd CT scan image at least one described the 3rd CT scan image, based on the 3rd CT scan image
In each pixel oil saturation value, obtain the oil saturation distributive law of the 3rd CT scan image；
Based on the oil saturation distributive law of each 3rd CT scan image at least one described the 3rd CT scan image, it is determined that
The bubble point pressure of foam oil in the porous media sample.
6. method as claimed in claim 5, it is characterised in that the oil saturation distributive law of the 3rd CT scan image is adopted
Represented with distribution curve；
Correspondingly, the bubble point pressure for determining foam oil in the porous media sample, including：
From the distribution curve of at least one the 3rd CT scan image, it is chosen in interval of definition without monotonicity extremely
A few oil saturation curve of frequency distribution；And will at least one described oil saturation curve of frequency distribution the corresponding 3rd
The set of CT scan image composition, is used as the 3rd CT scan image collection；
The 3rd maximum CT scan image of correspondence measurement container pressure value is chosen from the 3rd CT scan image collection, as
The CT scan image of first object the 3rd；And by the corresponding measurement container pressure value of the CT scan image of first object the 3rd, make
For reference pressure value, the bubble point pressure of foam oil in the porous media sample is used as.
7. the method as described in claim 1, it is characterised in that the porous media sample is sandpack column sample, the survey
It is fill out sand tube or core holding unit to measure container.
8. a kind of bubble point pressure test device, it is characterised in that including：
First CT scan image acquisition unit, for after porous media sample is dried and loads measurement container, being swept by CT
Retouch the first CT scan image for obtaining the porous media sample；
Second CT scan image acquisition unit, for the measurement container injection foam oil, making the pressure in the measurement container
Force value is the first preset value；And the second CT scan image of the porous media sample is obtained by CT scan；
3rd CT scan image acquisition unit, for gradually reducing the pressure value in the measurement container, until the measurement is held
Untill pressure value in device is the second preset value；And the porous media is obtained by CT scan during reduction pressure value is obtained
At least one the 3rd CT scan image of sample；
Bubble point pressure determining unit, for based on the first CT scan image, the second CT scan image and described
At least one the 3rd CT scan image, determines the bubble point pressure of foam oil in the porous media sample.
9. one kind intends bubble point pressure method of testing, it is characterised in that including：
After porous media sample is dried and loads measurement container, the first CT scan figure of the porous media sample is obtained
Picture；
To the measurement container injection foam oil, it is the first preset value to make the pressure value in the measurement container, and obtains described
Second CT scan image of porous media sample；
The pressure value in the measurement container is gradually reduced, until the pressure value in the measurement container is that the second preset value is
Only；And at least one the 3rd CT scan image of the porous media sample is obtained during pressure value is gradually reduced；
Based on the first CT scan image, the second CT scan image and at least one described the 3rd CT scan image,
Determine the plan bubble point pressure of foam oil in the porous media sample.
10. method as claimed in claim 9, it is characterised in that the acquisition porous media sample at least one
Three CT scan images, including：
Step a：Make the pressure value reduction designated value in the measurement container, obtain the 3rd CT scan of the porous media sample
Image；
Step b：Repeat step a, untill the pressure value in the measurement container is the second preset value.
11. method as claimed in claim 9, it is characterised in that the bubble point pressure of foam oil in the determination porous media
Force value, including：
For each 3rd CT scan image at least one described the 3rd CT scan image, based on the first CT scan figure
Each CT values and the 3rd CT scan figure of pixel in the CT values of each pixel, the second CT scan image as in
The CT values of each pixel, calculate the oil saturation value of each pixel in the 3rd CT scan image as in；
Oil-containing saturation based on each pixel in each 3rd CT scan image at least one described the 3rd CT scan image
Angle value, determines the plan bubble point pressure of foam oil in the porous media sample.
12. method as claimed in claim 11, it is characterised in that each pixel in the CT scan image of calculating the 3rd
Oil saturation value, including：
Using formulaCalculate the oil-containing saturation of each pixel in the 3rd CT scan image
Angle value；Wherein,
So,iFor the oil saturation value S of pixel i in the 3rd CT scan imageo；
CTx,iFor the CT values of pixel i in the 3rd CT scan image；
CTdry,iFor the CT values of pixel i in the first CT scan image；
CTwet,iFor the CT values of pixel i in the second CT scan image.
13. method as claimed in claim 11, it is characterised in that the plan of foam oil in the determination porous media sample
Bubble point pressure, including：
Oil-containing saturation based on each pixel in each 3rd CT scan image at least one described the 3rd CT scan image
Angle value, obtains the oil saturation distributive law of the 3rd CT scan image；
Based on the oil saturation distributive law of each 3rd CT scan image at least one described the 3rd CT scan image, it is determined that
The plan bubble point pressure of foam oil in the porous media sample.
14. method as claimed in claim 13, it is characterised in that the oil saturation distributive law of the 3rd CT scan image
Represented using distribution curve；
Correspondingly, the plan bubble point pressure for determining foam oil in the porous media sample, including：
From the distribution curve of at least one the 3rd CT scan image, it is chosen in interval of definition without monotonicity extremely
A few oil saturation curve of frequency distribution；And will at least one described oil saturation curve of frequency distribution the corresponding 3rd
The set of CT scan image composition, is used as the 3rd CT scan image collection；
The 3rd maximum CT scan image of correspondence measurement container pressure value is chosen from the 3rd CT scan image collection, as
The CT scan image of first object the 3rd；And by the corresponding measurement container pressure value of the CT scan image of first object the 3rd, make
For reference pressure value；By the oil saturation curve of frequency distribution of the CT scan image of first object the 3rd, contain as reference
Oily saturation degree curve of frequency distribution；
Correspondence measurement container pressure value is chosen from the 3rd CT scan image collection and is less than the reference pressure value and right
The CT of son the 3rd that the extreme point quantity and the reference oil saturation curve of frequency distribution for answering oil saturation curve are differed
Scan image set；
From the sub 3rd CT scan image collection, the oil-containing corresponding to the peak value of oil saturation curve of frequency distribution is chosen
The 3rd maximum CT scan image of intensity value, is used as the CT scan image of the second target the 3rd；And by second target the 3rd
The oil saturation distributive law value of CT scan image, is used as the plan bubble point pressure of foam oil in the porous media sample.
15. method as claimed in claim 9, it is characterised in that the porous media sample is sandpack column sample, the survey
It is fill out sand tube or core holding unit to measure container.
16. one kind intends bubble point pressure test device, it is characterised in that including：
First CT scan image acquisition unit, for after porous media sample is dried and loads measurement container, being swept by CT
Retouch the first CT scan image for obtaining the porous media sample；
Second CT scan image acquisition unit, for the measurement container injection foam oil, making the pressure in the measurement container
Force value is the first preset value；And the second CT scan image of the porous media sample is obtained by CT scan；
3rd CT scan image acquisition unit, for gradually reducing the pressure value in the measurement container, until the measurement is held
Untill pressure value in device is the second preset value；And the porous media is obtained by CT scan during reduction pressure value is obtained
At least one the 3rd CT scan image of sample；
Intend bubble point pressure determining unit, for based on the first CT scan image, the second CT scan image, Yi Jisuo
At least one the 3rd CT scan image is stated, the plan bubble point pressure of foam oil in the porous media sample is determined.
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