CN107727527A - A kind of system for determining the critical pressure gradient of foam generation at permeability mutation - Google Patents
A kind of system for determining the critical pressure gradient of foam generation at permeability mutation Download PDFInfo
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- CN107727527A CN107727527A CN201710780568.3A CN201710780568A CN107727527A CN 107727527 A CN107727527 A CN 107727527A CN 201710780568 A CN201710780568 A CN 201710780568A CN 107727527 A CN107727527 A CN 107727527A
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- 239000006260 foam Substances 0.000 title claims abstract description 91
- 230000035699 permeability Effects 0.000 title claims abstract description 61
- 230000035772 mutation Effects 0.000 title claims abstract description 35
- 239000004576 sand Substances 0.000 claims abstract description 139
- 239000011521 glass Substances 0.000 claims abstract description 31
- 238000002347 injection Methods 0.000 claims abstract description 31
- 239000007924 injection Substances 0.000 claims abstract description 31
- 239000007788 liquid Substances 0.000 claims abstract description 16
- 239000002245 particle Substances 0.000 claims abstract description 10
- 239000005341 toughened glass Substances 0.000 claims abstract description 5
- 238000000034 method Methods 0.000 claims description 16
- 239000000243 solution Substances 0.000 claims description 13
- 238000012360 testing method Methods 0.000 claims description 10
- 239000011324 bead Substances 0.000 claims description 8
- 239000012530 fluid Substances 0.000 claims description 7
- 238000007789 sealing Methods 0.000 claims description 7
- 230000008859 change Effects 0.000 claims description 6
- 239000005336 safety glass Substances 0.000 claims description 6
- 241000521257 Hydrops Species 0.000 claims description 5
- 206010030113 Oedema Diseases 0.000 claims description 5
- 239000004744 fabric Substances 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 230000029052 metamorphosis Effects 0.000 claims description 4
- LSNNMFCWUKXFEE-UHFFFAOYSA-M Bisulfite Chemical compound OS([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-M 0.000 claims description 3
- 239000003822 epoxy resin Substances 0.000 claims description 3
- 229920000647 polyepoxide Polymers 0.000 claims description 3
- 238000009938 salting Methods 0.000 claims description 3
- 230000004044 response Effects 0.000 abstract description 4
- 238000012986 modification Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000004088 foaming agent Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000007619 statistical method Methods 0.000 description 2
- 239000004604 Blowing Agent Substances 0.000 description 1
- 235000010838 Margyricarpus pinnatus Nutrition 0.000 description 1
- 240000000786 Margyricarpus pinnatus Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002981 blocking agent Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 238000009533 lab test Methods 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N7/00—Analysing materials by measuring the pressure or volume of a gas or vapour
- G01N7/10—Analysing materials by measuring the pressure or volume of a gas or vapour by allowing diffusion of components through a porous wall and measuring a pressure or volume difference
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/082—Investigating permeability by forcing a fluid through a sample
- G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
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- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Dispersion Chemistry (AREA)
- Fluid Mechanics (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention belongs to oil reservoir air to drive exploitation field, and in particular to a kind of system for determining the critical pressure gradient of foam generation at permeability mutation.Including fill out sand tube, liquid feed device, feeder, the data acquisition device being connected with fill out sand tube, fill out sand tube is provided with injection end and outflow end, the filled media of two sections of different-grain diameters is provided with fill out sand tube, the less filled media of particle diameter fills to form preceding back-up sand section close to injection end, the larger filled media of particle diameter is filled close to outflow end to be formed after back-up sand section, fill out sand tube is transparent toughened glass pipe, filled media is black glass pearl, also include observation device, observation device includes the microscope of the outer circumference surface of face fill out sand tube, the computer being connected with microscope, microscope is provided with camera.The system of the present invention can determine the critical pressure gradient of foam at permeability mutation, and foam is placed in porous media environment and studied, and permeability is undergone mutation the influence to foam generation in actual response heterogeneous reservoir.
Description
Technical field
The invention belongs to oil reservoir air to drive exploitation field, and in particular to foam generation faces at a kind of measure permeability mutation
The system of boundary's barometric gradient.
Background technology
Aerated fluid has higher apparent viscosity and preferable sealing characteristics, acts not only as blocking agent, and raising involves body
Product, improve water injection profile, be also used as the oil displacement efficiency that oil displacement agent improves non-homogeneous pay.Actual mining site typically by gas and
Blowing agent system injects stratum simultaneously, and the two is mixed to form foam and then played a role in the earth formation.Foam is in porous media
In the presence of a minimum barometric gradient, i.e. critical pressure gradient.Gas is generated when formation pressure gradient is less than critical pressure gradient
Steep larger and higher than more loose, the gas flow rate weak foam of size；Given birth to when formation pressure gradient is more than critical pressure gradient
Into bubble size compared with strong foam small, that liquid film number density is big, gas fluidity is relatively low.Weak foam to the shut-off capacity of hole very
Difference, the shut-off capacity of strong foam are stronger.The application that the presence of critical pressure gradient improves oil recovery factor for foam flooding is not
Profit, influence the critical pressure gradient size and the gas phase of injection and speed, the hole shape of porous media of liquid phase of foam generation
Shape, oil saturation, the type of surfactant and concentration etc. are closely related.
When foaming agent solution and gas are from low-permeability layer to high permeability formation seepage flow, uprushing for permeability is advantageous to the generation of foam.
Current laboratory experiment mainly injects porous media using foam device using the foam sent out as displacing agent, then studies foam
Resistance coefficient；Or influence of the different factors of research to the performance of the foam of generation.These researchs are all raw with foam
As premise, influence that the permeability extreme difference of the boundary for not accounting for uprushing in permeability generates to foam.It is existing in addition
The observation of form to generating foam is usually that micro- Microscopic observation is moved to after sampling, or connects hollow adopt in the rock core port of export
Sample device, foam depart from porous media environment, therefore when can not really react that permeability is undergone mutation in actual heterogeneous reservoir
Influence to foam generation.
The content of the invention
The problem of considering influence of the permeability mutation to foam generation for existing laboratory foam flooding experiment Fang Wei, this
The purpose of invention is to provide a kind of system for determining the critical pressure gradient of foam generation at permeability mutation, consideration permeability
The influence to foam generation is mutated, the critical pressure gradient that foam generates at permeability mutation can be determined, and foam is placed in
Studied in porous media environment, in actual response heterogeneous reservoir permeability undergo mutation to foam generation influence.
Further object of the present invention is provide it is a kind of using said system measure permeability mutation at foam generation it is critical
The method of barometric gradient.
The present invention provides following technical scheme：
A kind of system for determining the critical pressure gradient of foam generation at permeability mutation, including fill out sand tube, liquid feed device, supply
Device, the data acquisition device being connected with fill out sand tube, wherein fill out sand tube are provided with injection end and outflow end, and two sections are provided with fill out sand tube
The filled media of different-grain diameter, the less filled media of particle diameter are filled to form preceding back-up sand section close to injection end, and particle diameter is larger to be filled out
Filling medium is filled close to outflow end to be formed after back-up sand section, preceding back-up sand Duan Yuhou back-up sand sections connect, liquid feed device, feeder difference
Connected through constant pressure pump with injection end.
The system of the present invention includes fill out sand tube, liquid feed device, feeder, data acquisition device, liquid feed device and supply
Device provides expanding foam solution and is mixed to form foam in filling pipe with gas, the preceding back-up sand Duan Yuhou back-up sand sections being provided with fill out sand tube
The different nonisotropic medium filled section of two sections of permeabilities is formed, and because the diameter of preceding back-up sand section is small, the diameter of rear back-up sand section
Greatly, the permeability of preceding back-up sand section is made to be less than the permeability of rear back-up sand section, expanding foam solution and gas from back-up sand section after preceding back-up sand section flow direction
During foam is more readily formed due to the mutation of permeability.Data acquisition device collection back-up sand overpressure change so as to
The critical pressure gradient of foam generation is calculated, takes into full account that the permeability extreme difference for the boundary that permeability is uprushed generates to foam
Influence, improve the computational accuracy of critical pressure gradient.
As a modification of the present invention, the fill out sand tube is transparent toughened glass pipe, and filled media is black glass pearl.
By setting transparent toughened glass pipe to observe the generation state of foam in fill out sand tube, contrast effect is strengthened by black glass pearl
Fruit.
As a modification of the present invention, screen cloth is provided with the port of injection end and outflow end, the aperture of screen cloth, which is less than, to be filled out
The particle diameter of filling medium.Strengthen the stability of filled media.
As a modification of the present invention, the length ratio of preceding back-up sand Duan Yuhou back-up sand sections is 1:1~2:1.Ensure that fluid exists
Preceding back-up sand section fully flows.
As a modification of the present invention, the data acquisition device includes some pressure sensors and pressure sensor
The pressure data collector of connection, the computer being connected with pressure data collector, fill out sand tube are provided with sealing hole, pressure sensing
Device is stretched into fill out sand tube through sealing hole, and pressure sensor is uniformly distributed along the length direction of fill out sand tube.Fill out sand tube can be determined
In each section of the pressure loss, and judge which position is the pressure loss occur mainly in.
As a modification of the present invention, the both sides in the line of demarcation of two sections of filled medias of fill out sand tube are respectively provided with a pressure
Sensor.The pressure change of both sides at permeability mutation is detected, determines whether that foam generates.
One kind as the inventive method is improved, in addition to observation device, and observation device includes the cylindrical of face fill out sand tube
The microscope of side face, the computer being connected with microscope, microscope are provided with camera.The form of clear observation foam and migration
The metamorphosis of foam, obtains that spumescence can be reflected by the statistical analysis to foam before and after the mutation of rule, particularly permeability
The parameter of energy.
A kind of method for determining the critical pressure gradient of foam generation at permeability mutation, comprises the following steps：
（1）Medium permeability determines：From transparent safety glass pipe as fill out sand tube, the black of minor diameter is filled up in fill out sand tube
Color bead, fill out sand tube is vacuumized, then add the hole in water saturation fill out sand tube, fill out sand tube is heated into target reservoir temperature surveys
Determine permeability, change the black glass pearl filling fill out sand tube being relatively large in diameter and determine permeability；
（2）System assembles：In the injection end side filling step of fill out sand tube（1）The black glass pearl of medium-small diameter and fill out before being formed
Sand section, refill the black glass pearl of major diameter and back-up sand section after being formed, the injection end of fill out sand tube is filled through constant pressure pump and feed flow
Put, feeder connection, the outflow end of fill out sand tube is connected with hydrops cylinder, by data acquisition device, observation device and fill out sand tube
Connection, the system for obtaining determining the critical pressure gradient of foam generation at permeability mutation, the air-tightness of test system；
（3）Inject expanding foam solution：Fill out sand tube is injected using 0.4wt% а-alkene sulfonic acid salting liquid as expanding foam solution, injects number 8~10
PV；
（4）Draw graph of relation：Keep expanding foam solution injection flow velocity constant, inject gas through feeder, treat back-up sand pipe pressure
The pressure value at each position in fill out sand tube is gathered after stable, and records the metamorphosis of foam, is stepped up the pressure of gas to gas
Rate of flow of fluid reduces 10 times, draws the graph of relation that barometric gradient changes with gas flow rate, and wherein barometric gradient is on fill out sand tube
The pressure differential at two positions and the ratio of this section of back-up sand length of tube before and after any one section；
（5）Obtain critical pressure gradient：Find step（4）The flex point occurred on middle gained graph of relation, and it is corresponding before fill out
Sand Duan Yuhou back-up sand section boundarys foam density increases, then pressure gradient corresponding to flex point is critical pressure gradient.
In transparent safety glass pipe fill two kinds of different meshes black glass pearl, first half filling mesh number compared with
Small black glass pearl, the less porous media of permeability is formed, the black glass pearl of larger mesh number, shape are filled in latter half
The porous media larger into permeability.Multiple pressure taps are uniformly distributed on whole glass tube, wherein being undergone mutation in permeability
Border, i.e., it is high and low ooze connecting end surface both sides respectively distribution one pressure tap, since hypotonic end inject gas and foaming agent it is molten
Liquid, detects each pressure tap pressure change, and the part that displacement pressure difference is undergone mutation is the position that foam generation occurs.Foam is put
Studied in porous media environment, whether have foam generation and foam by safety glass pipe outer wall and observation device real-time monitored
Form, statistical analysis is carried out to the image of shooting, obtains the parameter that can reflect foaming properties, in actual response heterogeneous reservoir
The influence that permeability is undergone mutation to foam generation, critical pressure ladder is finally obtained according to the performance parameter of pressure difference change and foam
Degree and permeability extreme difference influence on foam generation boundary.
One kind as the inventive method is improved, step（1）In black glass pearl first pass through epoxy resin in fill out sand tube
Inner wall surface bond to form glass bead layer, be subsequently filled remaining black glass pearl.The expanding foam solution and gas for preventing injection exist
Channelling occurs for the wall of safety glass pipe.
One kind as the inventive method is improved, and the method for the air-tightness of test system is that system is placed in 2 MPa pressure
Pressure testing 30min is air tight under power.The air-tightness of guarantee system is good.
Beneficial effects of the present invention are as follows：
The system of the present invention can determine the critical pressure gradient that foam at permeability mutation generates, and foam is placed in porous
Studied in media environment, in actual response heterogeneous reservoir permeability undergo mutation to foam generation influence.
Brief description of the drawings
Fig. 1 is the structure chart of the system of the present invention.
Fig. 2 is the barometric gradient of experimental group 1 and the graph of relation of gas flow rate of the inventive method.
Fig. 3 be the inventive method experimental group 1 in foam form figure of barometric gradient when being 0.030MPa/m.
Fig. 4 be the inventive method experimental group 1 in foam form figure of barometric gradient when being 0.078MPa/m.
Fig. 5 is the barometric gradient of experimental group 2 and the graph of relation of gas flow rate of the inventive method.
In figure：1st, fill out sand tube, 11, preceding back-up sand section, 12, rear back-up sand section, 2, liquid feed device, 3, feeder, 31, gas stream
Gauge, 32, check valve, 4, data acquisition device, 41, pressure sensor, 42, pressure acquisition devices, 43, computer, 5, observation dress
Put, 51, microscope, 6, constant pressure pump, 7, hydrops cylinder.
Embodiment
Just the embodiment of the present invention is described further below in conjunction with the accompanying drawings.
As shown in Figure 1, a kind of system for determining the critical pressure gradient of foam generation at permeability mutation, including back-up sand
Pipe 1, liquid feed device 2, feeder 3, the data acquisition device 4 and observation device 5 being connected with fill out sand tube, wherein fill out sand tube are provided with
Injection end and outflow end, the interior filled media for being provided with two sections of different-grain diameters of fill out sand tube, the less filled media of particle diameter is close to injection
End filling formed before back-up sand section 11, the larger filled media of particle diameter is filled close to outflow end to be formed after back-up sand section 12, preceding back-up sand section
Connect with rear back-up sand section, preceding back-up sand is 1 with the length ratio of rear back-up sand section:1~2:1, preferably 2:1, liquid feed device, supply dress
Put and connected respectively through constant pressure pump 6 with injection end, the pipeline between feeder and constant pressure pump is provided with gas flowmeter 31, in gas
Check valve 32 is provided between flowmeter body and constant pressure pump, outflow end connects with hydrops cylinder 7.
Fill out sand tube is transparent toughened glass pipe, and 2~5cm of internal diameter of glass tube, length is 30~60cm, and filled media is black
Screen cloth is provided with the port of color bead, injection end and outflow end, data acquisition device includes some pressure sensors 41, with pressing
The pressure data collector 42 of force snesor connection, the computer 43 being connected with pressure data collector, fill out sand tube is provided with close
Sealing of hole, pressure sensor are stretched into fill out sand tube through sealing hole, and pressure sensor is uniformly distributed along the length direction of fill out sand tube, pressure
The precision of force snesor is 0.001MPa, is preferably provided with 5 pressure sensors, is included in point of two sections of filled medias of fill out sand tube
The both sides in boundary line are respectively provided with a pressure sensor, respectively set a pressure in the port of injection end of fill out sand tube and the port of outflow end
Force snesor, observation device includes microscope 51, the computer being connected with microscope of the outer circumference surface of face fill out sand tube, micro-
Mirror is provided with camera, microscope model MBL2000, and optical resolution is 480 times, and camera is the CCD of seven mega pixels
Camera.
A kind of method for determining the critical pressure gradient of foam generation at permeability mutation, comprises the following steps：
（1）Medium permeability determines：From transparent safety glass pipe as fill out sand tube, the black of minor diameter is filled up in fill out sand tube
Color bead, fill out sand tube is vacuumized, then add the hole in water saturation fill out sand tube, the injection number of water is 1 PV, then by back-up sand
Pipe is heated to target reservoir temperature measuring permeability, changes the black glass pearl filling fill out sand tube being relatively large in diameter and determines infiltration
Rate, when filling black glass pearl, first bond black glass pearl in the inner wall surface of fill out sand tube with epoxy resin and form glass
Pearl layer, then it is further continued for filling remaining black glass pearl；
（2）System assembles：In the injection end side filling step of fill out sand tube（1）The black glass pearl of medium-small diameter and fill out before being formed
Sand section, the black glass pearl of major diameter is and then filled and back-up sand section after being formed, by the injection end of fill out sand tube through constant pressure pump with supplying
Liquid device, feeder connection, the outflow end of fill out sand tube are connected with hydrops cylinder, by data acquisition device, observation device with filling out
Sandpipe connects, and the system for obtaining determining the critical pressure gradient of foam generation at permeability mutation, the air-tightness of test system, surveys
Method for testing is air tight for system is placed in into pressure testing 30min under 2 MPa pressure；
（3）Inject expanding foam solution：Fill out sand tube is injected using 0.4wt% а-alkene sulfonic acid salting liquid as expanding foam solution, injects number 8~10
PV；
（4）Draw graph of relation：Keep expanding foam solution injection flow velocity constant, inject gas through feeder, treat back-up sand pipe pressure
The pressure value at each position in fill out sand tube is gathered after stable, and records the metamorphosis of foam, is stepped up the pressure of gas to gas
Rate of flow of fluid reduces 10 times, draws the graph of relation that barometric gradient changes with gas flow rate, and wherein barometric gradient is on fill out sand tube
The pressure differential at two positions and the ratio of this section of back-up sand length of tube before and after any one section, the preferably injection end of fill out sand tube and outflow end it
Between pressure differential and fill out sand tube pipe range ratio；
（5）Obtain critical pressure gradient：Find step（4）The flex point occurred on middle gained graph of relation, and where the flex point
Back-up sand Duan Yuhou back-up sands section boundary foam density increases before moment, then pressure gradient corresponding to flex point is critical pressure ladder
Degree.
Test data
Experimental group 1：A diameter of 0.15mm of black glass pearl in preceding back-up sand section, permeability 1.2D, black glass in rear back-up sand section
A diameter of 0.42mm of glass pearl, permeability 6.1D, the permeability extreme difference of preceding back-up sand Duan Yuhou back-up sand sections is 5.08, fluid injection speed
For 0.7m/d, map to obtain Fig. 2 to gained barometric gradient and gas flow rate, in critical pressure gradient 0.072MPa/m, as Fig. 2
The value of ordinate corresponding to A points, gained foam form is shown in Fig. 3 when wherein barometric gradient is 0.030MPa/m, and barometric gradient is
Gained foam form is shown in Fig. 4 during 0.078MPa/m.It was found from Fig. 3, Fig. 4 contrast, when barometric gradient is less than critical pressure gradient, bubble
Foam form is loose and size is larger, and when barometric gradient is more than critical pressure gradient, foam form is fine and close, and bubble size is smaller.
Experimental group 2：A diameter of 0.084mm of black glass pearl in preceding back-up sand section, permeability 0.5D are black in rear back-up sand section
A diameter of 0.59mm of color bead, permeability 8.6D, the permeability extreme difference of preceding back-up sand Duan Yuhou back-up sand sections is 17.2, fluid injection
Speed is 0.7m/d, and the relation curve of gained barometric gradient and gas flow rate is shown in Fig. 5, critical pressure gradient 0.020MPa/m,
The value of ordinate corresponding to B points in as Fig. 5.
Claims (10)
1. it is a kind of determine permeability mutation at foam generation critical pressure gradient system, it is characterised in that including fill out sand tube,
Liquid feed device, feeder, the data acquisition device being connected with fill out sand tube, wherein fill out sand tube are provided with injection end and outflow end, fill out
The filled media of two sections of different-grain diameters is provided with sandpipe, the less filled media of particle diameter fills to form preceding back-up sand close to injection end
Section, the larger filled media of particle diameter is filled close to outflow end to be formed after back-up sand section, preceding back-up sand Duan Yuhou back-up sand sections connect, feed flow dress
Put, feeder connects through constant pressure pump with injection end respectively.
2. the system of the critical pressure gradient of foam generation, its feature at measure permeability mutation according to claim 1
It is, the fill out sand tube is transparent toughened glass pipe, and filled media is black glass pearl.
3. the system of the critical pressure gradient of foam generation at measure permeability mutation according to claim 1 or 2, it is special
Sign is, screen cloth is provided with the port of injection end and outflow end, and the aperture of screen cloth is less than the particle diameter of filled media.
4. the system of the critical pressure gradient of foam generation, its feature at measure permeability mutation according to claim 1
It is, the length ratio of preceding back-up sand Duan Yuhou back-up sand sections is 1:1~2:1.
5. the system of the critical pressure gradient of foam generation, its feature at measure permeability mutation according to claim 1
It is, the data acquisition device includes some pressure sensors, the pressure data collector being connected with pressure sensor and pressure
The computer of force data collector connection, fill out sand tube are provided with sealing hole, and pressure sensor is stretched into fill out sand tube through sealing hole,
Pressure sensor is uniformly distributed along the length direction of fill out sand tube.
6. the system of the critical pressure gradient of foam generation, its feature at measure permeability mutation according to claim 5
Son is, a pressure sensor is respectively provided with the both sides in the line of demarcation of two sections of filled medias of fill out sand tube.
7. the system of the critical pressure gradient of foam generation, its feature at measure permeability mutation according to claim 2
It is, in addition to observation device, observation device include microscope, the meter being connected with microscope of the outer circumference surface of face fill out sand tube
Calculation machine, microscope are provided with camera.
8. a kind of method for determining the critical pressure gradient of foam generation at permeability mutation, comprises the following steps：
（1）Medium permeability determines：From transparent safety glass pipe as fill out sand tube, the black of minor diameter is filled up in fill out sand tube
Color bead, fill out sand tube is vacuumized, then add the hole in water saturation fill out sand tube, fill out sand tube is heated into target reservoir temperature surveys
Determine permeability, change the black glass pearl filling fill out sand tube being relatively large in diameter and determine permeability；
（2）System assembles：In the injection end side filling step of fill out sand tube（1）The black glass pearl of medium-small diameter and fill out before being formed
Sand section, and then filling step（1）The black glass pearl of middle major diameter and back-up sand section after being formed, by the injection end of fill out sand tube through perseverance
Press pump is connected with liquid feed device, feeder, and the outflow end of fill out sand tube is connected with hydrops cylinder, by data acquisition device, observation
Device is connected with fill out sand tube, the system for obtaining determining the critical pressure gradient of foam generation at permeability mutation, test system gas
Close property；
（3）Inject expanding foam solution：Fill out sand tube is injected using 0.4wt% а-alkene sulfonic acid salting liquid as expanding foam solution, injects number 8~10
PV；
（4）Draw graph of relation：Keep expanding foam solution injection flow velocity constant, inject gas through feeder, treat back-up sand pipe pressure
The pressure value at each position in fill out sand tube is gathered after stable, and records the metamorphosis of foam, is stepped up the pressure of gas to gas
Rate of flow of fluid reduces 10 times, draws the graph of relation that barometric gradient changes with gas flow rate, and wherein barometric gradient is on fill out sand tube
The pressure differential at two positions and the ratio of this section of back-up sand length of tube before and after any one section；
（5）Obtain critical pressure gradient：Find step（4）The flex point occurred on middle gained graph of relation, and it is corresponding before fill out
Sand Duan Yuhou back-up sand section boundarys foam density increases, then pressure gradient corresponding to flex point is critical pressure gradient.
9. according to the method for claim 8, it is characterised in that step（1）In black glass pearl first pass through epoxy resin
Bond to form glass bead layer in the inner wall surface of fill out sand tube, then filling remaining bead.
10. according to the method for claim 8, it is characterised in that the method for the air-tightness of test system is that system is placed in into 2
Pressure testing 30min is air tight under MPa pressure.
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| CN201710780568.3A CN107727527B (en) | 2017-09-01 | 2017-09-01 | System for determining critical pressure gradient generated by foam at permeability mutation position |
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| CN201710780568.3A CN107727527B (en) | 2017-09-01 | 2017-09-01 | System for determining critical pressure gradient generated by foam at permeability mutation position |
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| CN107727527B CN107727527B (en) | 2020-12-29 |
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| CN109856326A (en) * | 2019-01-11 | 2019-06-07 | 成都理工大学 | A kind of novel foam evaluating apparatus and method |
| CN111185478A (en) * | 2020-03-13 | 2020-05-22 | 昆明理工大学 | Method for restoring cadmium-polluted soil based on switch surfactant |
| CN112782045A (en) * | 2021-02-05 | 2021-05-11 | 西南石油大学 | Device for measuring permeability of high-temperature and high-pressure foam liquid film and using method thereof |
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| CN114278258B (en) * | 2021-09-24 | 2023-07-18 | 中国海洋石油集团有限公司 | Length-adjustable temperature-resistant visual sand filling pipe |
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