CN103900755B - A kind of application CT measures the apparatus and method of oil gas minimum miscibility pressure - Google Patents
A kind of application CT measures the apparatus and method of oil gas minimum miscibility pressure Download PDFInfo
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- CN103900755B CN103900755B CN201410098384.5A CN201410098384A CN103900755B CN 103900755 B CN103900755 B CN 103900755B CN 201410098384 A CN201410098384 A CN 201410098384A CN 103900755 B CN103900755 B CN 103900755B
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- 238000000034 method Methods 0.000 title claims abstract description 27
- 239000007924 injection Substances 0.000 claims abstract description 23
- 238000002347 injection Methods 0.000 claims abstract description 23
- 238000002591 computed tomography Methods 0.000 claims abstract description 21
- 230000001105 regulatory effect Effects 0.000 claims abstract description 7
- 239000003208 petroleum Substances 0.000 claims description 12
- 230000006641 stabilisation Effects 0.000 claims description 5
- 238000011105 stabilization Methods 0.000 claims description 5
- 238000012800 visualization Methods 0.000 claims description 4
- 238000005259 measurement Methods 0.000 claims description 2
- 230000033228 biological regulation Effects 0.000 claims 1
- 238000013170 computed tomography imaging Methods 0.000 claims 1
- 229930195733 hydrocarbon Natural products 0.000 abstract description 4
- 150000002430 hydrocarbons Chemical class 0.000 abstract description 4
- 238000012545 processing Methods 0.000 abstract description 4
- 239000004215 Carbon black (E152) Substances 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 abstract description 3
- 239000000203 mixture Substances 0.000 abstract description 3
- 238000011084 recovery Methods 0.000 abstract description 3
- 238000004458 analytical method Methods 0.000 abstract description 2
- 230000001419 dependent effect Effects 0.000 abstract description 2
- 238000013508 migration Methods 0.000 abstract description 2
- 230000005012 migration Effects 0.000 abstract description 2
- 230000000704 physical effect Effects 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 50
- 239000012071 phase Substances 0.000 description 29
- DIOQZVSQGTUSAI-UHFFFAOYSA-N decane Chemical compound CCCCCCCCCC DIOQZVSQGTUSAI-UHFFFAOYSA-N 0.000 description 10
- 239000007788 liquid Substances 0.000 description 4
- 230000008034 disappearance Effects 0.000 description 3
- 238000003384 imaging method Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 210000005239 tubule Anatomy 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 238000004445 quantitative analysis Methods 0.000 description 1
- 238000010561 standard procedure Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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Abstract
A kind of application CT measures the apparatus and method of oil gas minimum miscibility pressure, belongs to oil exploitation field of engineering technology.The device includes CT scan system and oil gas mixed phase system：CT scan system includes universal X ray CT scanning means and data handling machine；Oil gas mixed phase system includes high-pressure bottle, gas injection pump, gas cylinder, temperature regulating device, vavuum pump, pressure sensor and temperature sensor, high-pressure bottle is positioned over inside CT scan device, the entrance of high-pressure bottle is connected by gas injection pump with gas cylinder, outlet connection vavuum pump and exhaust needle-valve.During measure, the CT images of gas mixture under different gas injection pressures are obtained first with CT scan, by respectively obtaining the gentle mutually pressure-dependent density value of oil phase after processing, it is determined that oil and air tightness difference curve and the intersection point of pressure axis, obtain the minimum miscibility pressure of oil gas.This method is light hydrocarbon and CO2The underground multi-phase multi-component migration rule analysis of tertiary oil recovery provides Basic Physical Properties Data.
Description
Technical field
The present invention relates to the apparatus and method that a kind of application CT measures oil gas minimum miscibility pressure, belong to oil exploitation engineering
Technical field.
Background technology
Fluid is injected at a certain temperature（Usually light hydrocarbons or N2、CO2Deng）Mixed phase is reached between given oil system
Minimum pressure required for state is referred to as minimum miscibility pressure（Minimum Miscibility Pressure,MMP）, it is to determine
Oil and row's no very important physical quantity for reaching complete mixed phase of purging physical efficiency, improve oil recovery factor for gas injection, mix
Phase immiscible displacement assesses, recover the oil economic design and effectively bury the engineering researcies such as greenhouse gases there is important guiding meaning
Justice.
MMP experimental measurement method mainly includes tubule method, rises bubble instrument method, interfacial tension disappearance method etc..Tubule method is most
It is also early that most Experimental Determination Methods, the standard method that this method is had developed into engineering are applied in engineering, but it is measured
Process is complicated, and time-consuming, less economical, and for the criterion disunity of mixed phase；Liter bubble instrument subtraction unit is simple, economy
It is good and faster, but non-quantized criterion of this method using the change of bubble shape as MMP, error is larger, lack quantitative letter
Breath, there is certain subjectivity in the explanation of mixed phase so that experimental result exists uncertain；In recent years the interface that new development is got up
Tension force disappearance method is become using the feature that interfacial tension disappearance is zero during oil gas mixed phase by the interfacial tension for measuring oil gas with pressure
Change curve to judge minimum miscibility pressure point, this method only focuses on interfacial tension this single one physical amount, and needs a large amount of
The inspection of standard complexity gas-liquid systemses, still suffers from certain limitation.
The content of the invention
It is contemplated that overcome above-mentioned problems of the prior art, a kind of minimum mixed phase of application CT measurements oil gas of exploitation
The apparatus and method of pressure.
This method is constant temperature first by high-pressure bottle control, obtains high under different gas injection pressures using CT scan imaging technique
Oil and the CT images of gas mixture in pressure vessel, obtain in visual field in gas-liquid two-phase oil phase and gas phase in a constant temperature after processing
Pressure-dependent density value under degree, is then fitted bent with pressure change oil and air tightness difference and the exponential relationship of pressure
Line, by determining that the curve and the intersection point of pressure axis obtain gas-liquid two-phase Midst density equal minimum when mixed phase occurs for oil gas two-phase
Pressure spot, the corresponding pressure of point is the minimum miscibility pressure of oil gas.This method can determine that oil gas is in PVT systems under different temperatures
Minimum miscibility pressure in system and porous media, promotes the understanding to the gas-liquid two-phase Balance of oil gas, is light hydrocarbon and CO2
The underground multi-phase multi-component migration rule analysis of tertiary oil recovery provides Basic Physical Properties Data.
The technical scheme is that：
A kind of application CT measures the device of oil gas minimum miscibility pressure, including CT scan system and oil gas mixed phase system.CT
Scanning system includes universal X ray CT scanning means and data handling machine；Oil gas mixed phase system includes high-pressure bottle, note
Air pump, gas cylinder, temperature regulating device, vavuum pump, pressure sensor and temperature sensor, wherein high-pressure bottle are positioned over CT scan device
Inside, the entrance of high-pressure bottle is connected by gas injection pump with gas cylinder, outlet connection vavuum pump and exhaust needle-valve；High-pressure bottle temperature
Control device to control temperature, the pressure in high-pressure bottle is measured using precision pressure sensor, surveyed using precision temperature sensor
Measure temperature in high-pressure bottle.
The method for measuring oil gas minimum miscibility pressure using said apparatus comprises the following steps：
（1）Load a certain amount of oil sample to be measured into high-pressure bottle, then high-pressure bottle is put into inside CT scan device.
（2）Pipeline is connected, the second needle-valve, the 3rd needle-valve is opened, vavuum pump is opened, vacuumizes and stops after 30 minutes, close
The second needle-valve, the 3rd needle-valve are closed, temperature regulating device is opened and temperature control is carried out to high-pressure bottle.
（3）Gas cylinder and the first needle-valve are opened, into injection pump after insufflation gas, the first needle-valve is closed.
（4）The second needle-valve is opened, working gas is filled with into high-pressure bottle using injection pump, while being adjusted using injection pump
Petroleum system pressure is to 0.1MPa in high-pressure bottle, and keeps constant pressure until petroleum system stabilization, is then shut off the second needle-valve；Profit
Temperature is recorded with temperature sensor, pressure is recorded using pressure sensor, using CT scan device to high after petroleum system stabilization
Two distributed mutuallies carry out visualization scanning inside pressure vessel.Oil gas two-phase Density Distribution is obtained using data acquisition process computer
CT images；
（5）Open the second needle-valve, using injection pump raise high-pressure bottle in petroleum system pressure, pressure intervals 1MPa,
Pressure is close to the pressure intervals for reducing lifting during minimum miscibility pressure, until the interface of oil and gas disappears.Under each pressure, all press
Step 4 scanning obtains the CT images of oil gas two-phase Density Distribution in high-pressure bottle, and a series of oil gas two-phase obtained under pressure is close
Spend the CT images of distribution.
（6）Data processing, to a series of entering for the CT images of the oil gas two-phase Density Distribution under gained same temperature, pressure
Row analyzing and processing, fitting obtains the exponential relationship curve of oil gas two-phase density difference and pressure, further calculates and obtains oil gas most
Small miscible pressure；
（7）Change temperature, repeat step (1)-(6) obtain oil gas minimum miscibility pressure under different temperatures.
The beneficial effects of the invention are as follows：Above-mentioned technical proposal directly perceived, undamaged can be determined using CT scan imaging technique
Oil gas minimum miscibility pressure, has the advantages that operability repeatability measure, and realize the dynamic of the miscible process of Oil and Gas System
Visualization and quantitative analysis, disclose influence of the temperature to Oil and Gas System minimum miscibility pressure.CT scan imaging technique is used as one kind
The non-intruding measuring technology of strength, oil gas two-phase can be obtained by different densities material to X-ray absorption and transmitance difference
The CT images of density, realize the measure of oil gas minimum miscibility pressure, while that realizes that oil gas is mutually dissolved material transmittance process can
Depending on change, disclose oil gas and balance each other rule.
Brief description of the drawings
Fig. 1 is that the application CT of the present invention measures the apparatus structure schematic diagram of oil gas minimum miscibility pressure.
Fig. 2 is CO2With n-decane system at 37.8 DEG C hydrocarbon density difference with pressure change curve.
In figure：1CT scanning means；2 high-pressure bottles；3 injection pumps；4 gas cylinders；5 temperature regulating devices；6 data acquisition process are calculated
Machine；7 vavuum pumps；The needle-valves of 8a first；The needle-valves of 8b second；The needle-valves of 8c the 3rd；8d is vented needle-valve；9 pressure sensors；10 TEMPs
Device；
R2Represent the coefficient correlation of matched curve；Minimum miscibility pressure is 7.82MPa.
Embodiment
Describe the embodiment of the present invention in detail below in conjunction with technical scheme and accompanying drawing.
Embodiment is at 37.8 DEG C, to CO2The minimum miscibility pressure carried out with n-decane system is tested.By Fig. 1 devices
Connected shown in system diagram after system pressure testing, a certain amount of n-decane is loaded in high-pressure bottle 2, then high-pressure bottle 2 is put into
Inside CT scan device 1.
Pipeline has been again coupled to, the second needle-valve 8b, the 3rd needle-valve 8c is opened, vavuum pump 7 has been opened, stops after vacuumizing 30 minutes
Only, the second needle-valve 8b, the 3rd needle-valve 8c are closed, the design temperature of temperature regulating device 5 is opened and temperature control is carried out to high-pressure bottle.Open gas cylinder
The 4 and first needle-valve 8a, a certain amount of gas is filled with into injection pump 3, the first needle-valve 8a is then shut off.
The second needle-valve 8b is opened, working gas is filled with into high-pressure bottle 2 using injection pump 3, while being adjusted using injection pump
Petroleum system pressure is to 0.1MPa in section high-pressure bottle, and keeps constant pressure until petroleum system stabilization, is then shut off the second needle-valve；
Temperature is recorded using temperature sensor 10, pressure is recorded using pressure sensor 9, it is steady to petroleum system using CT scan device 1
Two distributed mutuallies of the inside of high-pressure bottle 2 carry out visualization scanning after fixed.It is steady that petroleum system is obtained using data acquisition process computer 6
The CT images of oil gas two-phase Density Distribution after fixed.The second needle-valve 8b is opened, oil gas system in high-pressure bottle 2 is raised using injection pump 3
System pressure, pressure intervals 1MPa reduces elevated pressure intervals when pressure is close to minimum miscibility pressure, until gas and oil interface
Disappear.Under each pressure, the CT images for obtaining oil gas two-phase Density Distribution in high-pressure bottle 2 are all scanned by above-mentioned steps,
Obtain a series of CT images of the oil gas two-phase Density Distribution under pressure.
Oil gas two-phase density value under different pressures is obtained by above-mentioned steps, as shown in table 1.In fig. 2, data point is carried out
Fitting, obtains the intersection point corresponding pressure value of the exponential relationship curve of oil gas two-phase density difference and pressure, the curve and pressure axis,
As CO2With minimum miscibility pressure of the n-decane at 37.8 DEG C.
The CO of table 12/ n-decane system liquid phase volume, two phase densities and density contrast
Claims (1)
1. a kind of method for measuring oil gas minimum miscibility pressure, it is characterised in that：It is mixed using one kind application CT measurement oil gas minimums
The device of phase pressure, the device includes CT scan system and oil gas mixed phase system, and CT scan system is swept including universal X ray CT
Imaging apparatus (1) and data handling machine (6)；Oil gas mixed phase system includes high-pressure bottle (2), injection pump (3), gas cylinder (4), control
Warm device (5), vavuum pump (7), pressure sensor (9) and temperature sensor (10), wherein high-pressure bottle (2) are positioned over CT scan
Device (1) is internal, and the entrance of high-pressure bottle (2) is connected by injection pump (3) with gas cylinder (4), outlet connection vavuum pump (7) and row
Air tube valve (8d)；High-pressure bottle controls temperature with temperature regulating device (5), and high-pressure bottle is measured using precision pressure sensor (9)
Interior pressure, the temperature in high-pressure bottle, the gas cylinder (4) and the injection pump are measured using precision temperature sensor (10)
(3) the first needle-valve (8a) is provided between, the second needle-valve is provided between the injection pump (3) and the high-pressure bottle (2)
(8b), is provided with the 3rd needle-valve (8c) between the high-pressure bottle (2) and the vavuum pump (7)；
This method comprises the following steps：
1) load oil sample to be measured into high-pressure bottle (2), then high-pressure bottle (2) is put into CT scan device (1) inside；
2) pipeline is connected, the second needle-valve (8b), the 3rd needle-valve (8c) is opened, vavuum pump (7) is opened, stops after vacuumizing 30 minutes
Only, the second needle-valve (8b), the 3rd needle-valve (8c) are closed, temperature regulating device (5) is opened and temperature control is carried out to high-pressure bottle (2)；
3) gas cylinder (4) and the first needle-valve (8a) are opened, into injection pump (3) after insufflation gas, the first needle-valve (8a) is closed；
4) the second needle-valve (8b) is opened, working gas is filled with into high-pressure bottle (2) using injection pump (3), while utilizing injection
Petroleum system pressure is to 0.1MPa in pump regulation high-pressure bottle, and keeps constant pressure until petroleum system stabilization, is then shut off second
Needle-valve (8b)；Temperature is recorded using temperature sensor (10), pressure is recorded using pressure sensor (9), utilizes CT scan device
(1) visualization scanning is carried out to internal two distributed mutuallies of high-pressure bottle (2) after petroleum system stabilization, calculated using data acquisition process
Machine (6) obtains the CT images of oil gas two-phase Density Distribution；
5) the second needle-valve (8b) is opened, high-pressure bottle (2) interior petroleum system pressure, pressure intervals are raised using injection pump (3)
1MPa, reduces the pressure intervals of lifting when pressure is close to minimum miscibility pressure, until the interface of oil and gas disappears；In each pressure
Under, all by step 4) the CT images for obtaining high-pressure bottle (2) interior oil gas two-phase Density Distribution are scanned, obtain under a series of pressure
Oil gas two-phase Density Distribution CT images；
6) a series of CT images of the oil gas two-phase Density Distribution under gained same temperature, pressure are analyzed and processed, be fitted
The exponential relationship curve of oil gas two-phase density difference and pressure is obtained, further calculates and obtains oil gas minimum miscibility pressure；
7) change temperature, repeat the above steps, obtain oil gas minimum miscibility pressure under different temperatures.
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| CN104089722B (en) * | 2014-07-17 | 2017-01-18 | 上海理工大学 | Method for measuring internal temperature of objects through CT |
| CN105181222B (en) * | 2015-10-12 | 2016-12-14 | 东北石油大学 | A kind of multimode measures the device of carbon dioxide minimum miscibility pressure |
| CN105258840B (en) * | 2015-11-12 | 2016-11-09 | 东北石油大学 | A kind of method measuring the optimal miscible pressure of carbon dioxide between injection-production well and mixed phase region |
| CN105403347B (en) * | 2015-11-27 | 2019-09-06 | 中国石油化工股份有限公司 | CO2Drive THE MINIMUM MISCIBLE PRESSURE method and dedicated unit |
| CN110319897A (en) * | 2019-07-18 | 2019-10-11 | 四川洵美科技有限公司 | A kind of gas-liquid two-phase fluid Flow Measuring System and method |
| CN110261266A (en) * | 2019-07-29 | 2019-09-20 | 西南石油大学 | A kind of apparatus and method of comprehensive NMR and CT scan measurement oil gas minimum miscibility pressure |
| CN114320247B (en) * | 2020-09-27 | 2024-04-30 | 中国石油天然气股份有限公司 | Comprehensive discrimination method and device for gas-drive mixed phase index |
| CN115290627A (en) * | 2022-08-04 | 2022-11-04 | 中国石油大学(华东) | High-temperature high-pressure hydrocarbon-carbon dioxide-water visual thermal simulation experiment method |
| CN115950577A (en) * | 2022-09-30 | 2023-04-11 | 华东理工大学 | Minimum mixed phase pressure measurement system based on micro-fluidic technology and measurement method thereof |
| CN118376764A (en) * | 2024-06-24 | 2024-07-23 | 中国石油大学(华东) | Minimum miscible pressure measurement device and experimental method based on photoelectric effect |
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| US4795903A (en) * | 1985-10-25 | 1989-01-03 | United Kingdom Atomic Energy Authority | Analysis of fluids |
| EP0459648A1 (en) * | 1990-05-31 | 1991-12-04 | Gamma-Metrics | Substance detection system |
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