CN103018134A - Device and method for determination of oil gas minimum miscibility pressure through magnetic resonance imaging technology - Google Patents
Device and method for determination of oil gas minimum miscibility pressure through magnetic resonance imaging technology Download PDFInfo
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Abstract
Belonging to the technical field of chemical engineering and petroleum engineering, the invention relates to a device and a method for determination of an oil gas minimum miscibility pressure through a magnetic resonance imaging technology. The device mainly comprises a magnetic resonance imaging system and a gas injection system. For the magnetic resonance imaging system, a pressure vessel is arranged in a magnetic resonance imaging instrument, a flat bottom test tube is positioned in the high pressure vessel, and the magnetic resonance imaging instrument is electrically connected to a data acquisition and processing system. The method for determining the minimum miscibility pressure of gas and oil firstly makes use of a magnetic resonance imaging technology to determine the signal strength distribution of oil in the flat bottom test tube so as to obtain a signal strength change curve of oil in gas and liquid phases within an imaging visual field under certain temperature along with the variation of pressure. By determining the intersection point of the signal strength curve and a pressure axis, the minimum miscibility pressure of gas and oil can be obtained. The method can determine the minimum miscibility pressure of gas and oil and enhance the understanding on the gas-liquid two-phase equilibrium law of gas and oil, thus being able to provide basic physical property data for underground multiphase multicomponent migration law analysis of light hydrocarbon and CO2 tertiary oil recovery.
Description
Technical field
The present invention relates to a kind of apparatus and method of utilizing mr imaging technique to measure the minimum miscible pressure of oil gas, belong to chemical engineering and petroleum engineering technical field.
Background technology
Minimum miscible pressure is oil gas two miscible minimum pressures that become single-phase at a certain temperature, and accurate quick is measured the minimum miscible pressure of gas and oil, for gas injection (CO
2, lighter hydrocarbons etc.) improve oil recovery factor, the assessment of mixed phase immiscible displacement, the economy design of recovering the oil and effectively bury the engineering research such as greenhouse gases and have great importance.Can on the basis of routine techniques, further improve oil recovery 10%-15% by the gas drive technology, therefore further further investigate the gas-liquid two-phase Balance of gas and oil, be light hydrocarbon and CO
2The underground multi-phase multi-component migration rule analysis of tertiary oil recovery provides Basic Physical Properties Data necessary.
Measurement research about the minimum miscible pressure of oil gas has proposed a lot of method of testings.The most frequently used method is the tubule method, and the method has developed into the standard method in the engineering, but its measuring process is complicated, and length consuming time is less economical, and for the criterion disunity of mixed phase; Secondly, bubble rising instrument method, device is simple, good economy performance, and faster, but does not belong to quantitative measurment, and it is larger that error is compared additive method; In recent years, the interfacial tension disappearance was zero feature when the interfacial tension disappearance method of new development was utilized the oil gas mixed phase, judge minimum miscible pressure point with the interfacial tension of oil with pressure history by measuring gas, the method is only paid close attention to this single one physical amount of interfacial tension, also need the check of the complicated gas-liquid systems of a large amount of standards, still have certain limitation.
Summary of the invention
The present invention is intended to overcome above-mentioned problems of the prior art, develops a kind of apparatus and method of utilizing mr imaging technique to measure the minimum miscible pressure of oil gas.The method utilizes mr imaging technique to detect the material Transfer process that uniform temperature and the certain pressure therapeutic method to keep the adverse qi flowing downward and oil phase are dissolved each other and separated, determine that system reaches after the balance signal intensity profile of oil in the flat based tubes, obtain in the visual field signal intensity of oil in the gas-liquid two-phase at a certain temperature with the change curve of pressure, by determining the intersection point of intensity curves and pressure axis, obtain the minimum miscible pressure of gas and oil, the rule thereby announcement oil gas balances each other.
Technical scheme of the present invention is: a kind of device that utilizes mr imaging technique to measure the minimum miscible pressure of oil gas, it comprises a magnetic resonance imaging system and gas injection system, be provided with a high pressure vessel in the magnetic resonance imager of described magnetic resonance imaging system, a flat test tube is housed in the described high pressure vessel; Entrance at high pressure vessel connects described gas injection system, and outlet connects a vacuum pump and a sump pit; Described high pressure vessel two ends are connected with the heating and cooling ebullator; Described gas injection system adopts injection pump directly to be connected with high pressure vessel through retaining valve, connects a gas cylinder between injection pump and retaining valve.
Described a kind of method of utilizing mr imaging technique to measure the minimum miscible pressure of oil gas may further comprise the steps:
(1) a certain amount of oil sample to be measured of packing in the flat based tubes, the flat based tubes that oil sample will be housed is again put into high pressure vessel;
(2) connect pipeline, open the second needle-valve, the 3rd needle-valve, open vacuum pump, stop after vacuumizing 30 minutes, close the second needle-valve, the 3rd needle-valve, open the heating and cooling ebullator that fluorocarbon oil is housed high pressure vessel is carried out temperature control;
(3) open gas cylinder and the first needle-valve, be filled with gas in the injection pump after, close the first needle-valve;
(4) open the second needle-valve, utilize injection pump in high pressure vessel, to be filled with working gas, begin to detect, utilize simultaneously injection pump to regulate the interior petroleum system pressure of high pressure vessel to 0.1MPa, and keep constant voltage until gas-oil system is stable, then close the second needle-valve; Utilize K type thermopair record temperature, utilize pressure unit record pressure, utilize mr imaging technique to obtain oil phase proton density distributed image in the stable rear flat based tubes of gas-oil system;
(5) open the second needle-valve (10b), utilize petroleum system pressure in the injection pump rising high pressure vessel, pressure intervals 1MPa, the pressure intervals that reduces to promote during near minimum miscible pressure at pressure is until gas and the disappearance of oily interface.Under each pressure, all press step (4) and detect oil phase proton density distributed image in the flat based tubes, obtain the oil phase proton density distributed image under a series of pressure;
(6) detect data and process, the signal strength values of the oil phase proton density image under gained same temperature, a series of pressure is carried out analyzing and processing, match obtains the exponential relationship of signal strength values and pressure, further calculates gas-oily minimum miscible pressure;
(7) temperature of change heating and cooling ebullator, repeating step (1)-(6) obtain the different temperatures therapeutic method to keep the adverse qi flowing downward-oily minimum miscible pressure.
The invention has the beneficial effects as follows: this device that utilizes mr imaging technique to measure the minimum miscible pressure of oil gas, be provided with a high pressure vessel in the magnetic resonance imager of its magnetic resonance imaging system, a flat test tube is housed in the high pressure vessel, and magnetic resonance imager adopts with data acquisition processing system and is electrically connected.The method of this mensuration gas and oily minimum miscible pressure, at first utilize mr imaging technique to determine the signal intensity profile of oil in the flat based tubes, obtain in the visual field signal intensity of oil in the gas-liquid two-phase at a certain temperature with the change curve of pressure, by determining the intersection point of intensity curves and pressure axis, obtain the minimum miscible pressure of gas and oil.The method can be determined the minimum miscible pressure of gas and oil, realizes dynamic and visual and the quantitative analysis of the miscible process of Oil and Gas System, discloses temperature to the impact of the minimum miscible pressure of gas-oil systems.The MRI technology is as a kind of non-intruding measuring technology of brute force, can obtain the oil phase proton density by pulsed field gradient magnetic resonance method, realize the mensuration of the minimum miscible pressure of oil gas, realize simultaneously the visual of the mutual dissolved substance transmittance process of oil gas, disclose the oil gas rule that balances each other.
Description of drawings
Fig. 1 is a kind of plant system drawing that utilizes mr imaging technique to measure the minimum miscible pressure of oil gas.
Fig. 2 is CO
2With the n-decane system 37.8 ℃ the time signal intensity with the change curve of pressure.
Among the figure: 1, magnetic resonance imager, 2, high pressure vessel, 3, injection pump, 4, gas cylinder, 5, the heating and cooling ebullator, 6, data acquisition processing system, 7, vacuum pump, 8, flat based tubes, 9, sump pit, 10a, the first needle-valve, 10b, the second needle-valve, 10c, the 3rd needle-valve, 10d, the 4th needle-valve, 11a, the first pressure unit, 11b, the second pressure unit, 11c, the 3rd pressure unit, 12, thermopair, 13, retaining valve; Pressure when P represents gas-oil system balance; S represents the oil phase signal intensity; R
2The related coefficient of expression matched curve; P
MRepresent minimum miscible pressure.
Embodiment
Be described in detail the specific embodiment of the present invention below in conjunction with technical scheme and accompanying drawing.Described embodiment is for further describing the present invention, rather than restriction the present invention.
Fig. 1 is a kind of plant system drawing that utilizes mr imaging technique to measure the minimum miscible pressure of oil gas.
Among the figure, this device that utilizes mr imaging technique to measure the minimum miscible pressure of oil gas mainly comprises a magnetic resonance imaging system, it also comprises a gas injection system, magnetic resonance imaging system is provided with a high pressure vessel 2 in magnetic resonance imager 1, high pressure vessel 2 one of interior placement fill the flat based tubes 8 of certain gauging.Connect a gas injection system at high pressure vessel 2 entrances, outlet connects a vacuum pump 7 and a sump pit 9; Heating and cooling ebullator 5 is connected with high pressure vessel 2 two ends by pipeline; Gas injection system adopts injection pump 3 to be connected through the entrance of retaining valve 13 with high pressure vessel 2, is connected a gas cylinder 4 between injection pump 3 and retaining valve 13.Described magnetic resonance imager adopts with data acquisition processing system 6 and is electrically connected.
Above-mentioned magnetic resonance imaging system also is provided with the pressure monitoring system of the first pressure unit 11a, the second pressure unit 11b, the 3rd pressure unit 11c.A certain amount of oil is housed in the flat based tubes 8, utilizes the heating and cooling ebullator 5 that fluorocarbon oil is housed to carry out loop temperature-control, realize the isoperibol in the high pressure vessel.Utilize pressure monitoring system and temperature control system to make detection system reach temperature required and pressure, and the pressure of Real-Time Monitoring high pressure vessel 2 interior G﹠Os; The recycling magnetic resonance imager carries out quantitative test to oil phase density.
The above-mentioned method of utilizing mr imaging technique to measure gas and oil may further comprise the steps:
The first step, preliminary work.
(1) connects detection system pipeline, pressure testing according to diagram;
(2) a certain amount of oil sample to be measured of packing in the flat based tubes 8, the flat based tubes 8 that oil sample will be housed is again put into high pressure vessel 2;
(3) again connect pipeline, open the second needle-valve 10b, the 3rd needle-valve 10c, open vacuum pump, stop after vacuumizing 30 minutes, close the second needle-valve 10b, the 3rd needle-valve 10c, open 5 pairs of high pressure vessels of heating and cooling ebullator 2 that fluorocarbon oil is housed and carry out temperature control;
(4) open gas cylinder 4 and the first needle-valve 10a, in injection pump 3, be filled with a certain amount of gas, then close the first needle-valve 10a.
Second step begins to detect, and utilizes mr imaging technique that gas-oily course of dissolution is carried out dynamic and visual and detects.Open the second needle-valve 10b, utilize injection pump 3 in high pressure vessel 2, to be filled with working gas, begin to detect the oil phase proton density, regulate high pressure vessel 2 interior gas-oil system pressure to 0.1MPa, and keep constant voltage until gas-oil system is stable, then close the second needle-valve 10b; Utilize K type thermopair 12 record temperature, utilize the second pressure unit 11b, the 3rd pressure unit 11c to record pressure, utilize mr imaging technique to obtain oil phase proton density distributed image in the stable rear flat based tubes of gas-oil system.Open the second needle-valve 10b, utilize gas in the injection pump 3 rising high pressure vessels-oil system pressure, pressure intervals 1MPa, the pressure intervals that reduces to raise during near minimum miscible pressure at pressure is until gas and the disappearance of oily interface.Under each pressure, all press above-mentioned steps and detect oil phase proton density distributed image in the flat based tubes, obtain the oil phase proton density distributed image under a series of pressure.Preserve and detect data, high pressure vessel 2 and flat test tube 8 are taken out in release, after the cleaning, repeat (1)-(4) in the first step, prepare for next group detects.
In the 3rd step, testing result is processed.Arrangement detects data, signal strength values to the oil phase proton density image under gained same temperature, a series of different pressures carries out analyzing and processing, with data analysis software data point is carried out match, obtain the exponential relationship curve of signal strength values and pressure, the intersection point of curve and pressure axis is defined as gas-oily minimum miscible pressure.
Embodiment
37.8 ℃ the time, select CO
2Minimum miscible pressure experiment is done by/n-decane system.The 0.5ml n-decane of packing in flat based tubes places in the high pressure vessel, obtains the signal intensity of oil phase proton density figure under the different pressures by the above-mentioned first step and second step, and is as shown in the table.In Fig. 2, data point is carried out match, obtain the exponential relationship curve of signal intensity and pressure, the intersection point corresponding pressure value of this curve and pressure axis is CO
2With the minimum miscible pressure of n-decane 37.8 ℃ the time.
Claims (2)
1. device that utilizes mr imaging technique to measure the minimum miscible pressure of oil gas, it comprises a magnetic resonance imaging system and gas injection system, it is characterized in that: be provided with a high pressure vessel (2) in the magnetic resonance imager of described magnetic resonance imaging system (1), a flat test tube (8) is housed in the described high pressure vessel (2); Entrance at high pressure vessel (2) connects described gas injection system, and outlet connects a vacuum pump (7) and a sump pit (9); Described high pressure vessel two ends are connected with heating and cooling ebullator (5); Described gas injection system adopts injection pump (3) directly to be connected with high pressure vessel (2) through retaining valve (13), connects a gas cylinder (4) between injection pump (3) and retaining valve (13).
2. a kind of method of utilizing mr imaging technique to measure the minimum miscible pressure of oil gas according to claim 1 is characterized in that: may further comprise the steps:
(1) a certain amount of oil sample to be measured of packing in the flat based tubes (8), the flat based tubes (8) that oil will be housed is again put into high pressure vessel (2);
(2) connect pipeline, open the second needle-valve (10b), the 3rd needle-valve (10c), open vacuum pump (7), stop after vacuumizing 30 minutes, close the second needle-valve (10b), the 3rd needle-valve (10c), open the heating and cooling ebullator (5) that fluorocarbon oil is housed high pressure vessel is carried out temperature control;
(3) open gas cylinder (4) and the first needle-valve (10a), be filled with gas in the injection pump (3) after, close the first needle-valve (10a);
(4) open the second needle-valve (10b), utilize injection pump (3) in high pressure vessel (2), to be filled with working gas, begin to detect, utilize simultaneously injection pump (3) to regulate the interior petroleum system pressure of high pressure vessel (2) to 0.1MPa, and keep constant voltage until petroleum system is stable, then close the second needle-valve (10b); Utilize K type thermopair record temperature, utilize pressure unit record pressure, utilize mr imaging technique to obtain the stable rear interior oil phase proton density of flat based tubes (8) distributed image of gas-oil system;
(5) open the second needle-valve (10b), utilize the interior gas of injection pump (3) rising high pressure vessel (2)-oil system pressure, pressure intervals 1MPa, the pressure intervals that reduces to promote during near minimum miscible pressure at pressure, until gas and oily interface disappear, under each pressure, all press step (4) and detect the interior oil phase proton density of flat based tubes (8) distributed image, obtain the oil phase proton density distributed image under a series of pressure;
(6) detect data and process, the signal strength values of the oil phase proton density image under gained same temperature, a series of pressure is carried out analyzing and processing, match obtains the exponential relationship of signal strength values and pressure, further calculates gas-oily minimum miscible pressure;
(7) temperature of change heating and cooling ebullator (5), repeating step (1)-(6) obtain the different temperatures therapeutic method to keep the adverse qi flowing downward-oily minimum miscible pressure.
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| CN106124118A (en) * | 2016-07-05 | 2016-11-16 | 中国石油天然气股份有限公司 | Bubble rising instrument and using method thereof |
| 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 |
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| CN103471679A (en) * | 2013-08-13 | 2013-12-25 | 中国石油天然气股份有限公司 | Method for measuring pore volume of thin pipe model |
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| CN103900755A (en) * | 2014-03-14 | 2014-07-02 | 大连理工大学 | Device and method for measuring minimum miscibility pressure of oil and gas through CT |
| CN103900755B (en) * | 2014-03-14 | 2017-08-01 | 大连理工大学 | A kind of application CT measures the apparatus and method of oil gas minimum miscibility pressure |
| CN105116107A (en) * | 2015-07-31 | 2015-12-02 | 中国石油天然气股份有限公司 | CO under oil reservoir condition2Identification method for phase state in ultra-low permeability homogeneous core |
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| CN105403347A (en) * | 2015-11-27 | 2016-03-16 | 中国石油化工股份有限公司 | Measurement and determination method for minimum miscible pressure of CO2 flooding and special-purpose apparatus thereof |
| 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 |
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| CN106124118B (en) * | 2016-07-05 | 2018-12-28 | 中国石油天然气股份有限公司 | Bubble rising instrument and using method thereof |
| 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 |
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Application publication date: 20130403 |