CN105258840A - Method for measuring optimum miscible pressure and miscible region of carbon dioxide between injection and production wells - Google Patents
Method for measuring optimum miscible pressure and miscible region of carbon dioxide between injection and production wells Download PDFInfo
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- CN105258840A CN105258840A CN201510655367.1A CN201510655367A CN105258840A CN 105258840 A CN105258840 A CN 105258840A CN 201510655367 A CN201510655367 A CN 201510655367A CN 105258840 A CN105258840 A CN 105258840A
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- carbon dioxide
- pressure
- mixed phase
- crude oil
- rock gas
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Abstract
The invention discloses a method for measuring the optimum miscible pressure and miscible region of carbon dioxide between injection and production wells and solves a problem that minimum miscible pressure measured by means of a sand-filling method is inconsistent with an actual fact. The method comprises steps of: enabling the carbon dioxide and crude oil containing natural gas to be in successive contact under different pore throat conditions to achieve miscibility in order to test minimum miscible pressure under different pore throat conditions; and according to plane heterogeneity between an injection well and a production well of an actual reservoir stratum, testing the actual minimum miscible pressure Pm of the carbon dioxide and the crude oil containing natural gas under natural core pore throats with different permeability in order to obtain the optimum miscible pressure P of the reservoir stratum. The method may acquire the minimum miscible pressure of an actual heterogeneous reservoir stratum, may simulate carbon dioxide miscible displacement of the actual heterogeneous reservoir stratum, draws a carbon dioxide miscible displacement distribution diagram according to an experiment result, and is beneficial to the popularization and application of numerical simulation.
Description
Technical field
The present invention relates to and a kind ofly realize method that carbon dioxide mixed phase drives and device, belong to carbon dioxide flooding and improve recovery efficiency technique field.
Background technology
Carbon-dioxide flooding is one of method of the raising recovery ratio of most potentiality in tertiary oil recovery, and carbon dioxide flooding is divided into mixed phase to drive and non-phase-mixing driving, and the oil displacement efficiency that mixed phase drives is better than non-phase-mixing driving.In mining site, the ideal state of carbon dioxide flooding is that the ratio that mixed phase drives is the bigger the better, but the regional extent that carbon dioxide mixed phase drives has much on earth, current field test can not return concrete test evaluation, in order to the situation that mixed phase in objective evaluation reservoir drives, need to carry out the indoor experiment of relevant carbon dioxide.
Current carbon dioxide flooding in-house laboratory investigation needs to test the best miscible pressure P of reservoir, then using P as back pressure, carry out mixed phase between simulation well and drive experiment, draw carbon dioxide mixed phase and drive regional distribution chart.And test best miscible pressure P, need to carry out the experiment of tubule test minimum miscibility pressure, the subject matter of slim-tube test test minimum miscibility pressure is to use the method for back-up sand in simulation tubule to test at present, the minimum miscibility pressure that what it recorded is at a certain specific processing condition, and actual reservoir has plane heterogeneity, namely the permeability distribution from Injection Well to extraction well is uneven, so the minimum miscibility pressure of experiment gained can not represent the real minimum miscibility pressure of actual reservoir, even if displacement pressure reaches the minimum miscibility pressure recorded, also cannot realize complete mixed phase in reservoir to drive.
Summary of the invention
The present invention is directed to and use the method for back-up sand in simulation tubule to test carbon dioxide and crude oil minimum miscibility pressure at present, what obtain is minimum miscibility pressure under specific processing condition, and actual reservoir has plane heterogeneity, cause the inaccurate problem of test result, devise a kind of method measuring carbon dioxide and the best miscible pressure of crude oil, thus the best miscible pressure recorded can be utilized to realize the maximization that carbon dioxide mixed phase drives region area, and identical carbon dioxide can be grasped and can realize mixed phase from crude oil in different permeability zones, and carbon dioxide mixed phase can be obtained drive distribution plan.
In order to realize foregoing invention object, the technical solution used in the present invention is: a kind of method measuring the best miscible pressure of carbon dioxide between injection-production well and mixed phase region, particularly:
One, carbon dioxide is made under different pore throat condition, successively to contact with containing rock gas crude oil the minimum miscibility pressure reaching mixed phase to test under different pore throat condition
(1) carbon dioxide and the minimum miscibility pressure P being issued to mixed phase containing rock gas crude oil at complete contact conditions is tested
1;
(2) by above-mentioned minimum miscibility pressure P
1as back pressure, test carbon dioxide and the minimum miscibility pressure P being issued to mixed phase containing the rock gas crude oil situation that namely pore throat amplifies in back-up sand tubule
2;
Two, according to the plane heterogeneity between the Injection Well of actual reservoir to extraction well, test the carbon dioxide of this reservoir under the natural core pore throat of different permeability and the actual minimum miscibility pressure Pm containing rock gas crude oil, obtain the best miscible pressure P of this reservoir
(1) by P
2as back pressure, test carbon dioxide and contain the minimum miscibility pressure that rock gas crude oil reaches mixed phase in the natural core of different permeability, obtain carbon dioxide and in the small pore throat of reality, namely contact the carbon dioxide in basic fully situation with crude oil and contain the minimum miscibility pressure P of rock gas crude oil
3, P
4, P
5, P
6pn,
nfor the number of the different permeabilities of actual reservoir, P
3, P
4, P
5, P
6numerical value Pm maximum in Pn is the actual minimum miscibility pressure of reservoir;
(2) P is compared
3, P
4, P
5, P
6the parting pressure Po of Pn and corresponding actual reservoir, determines that best miscible pressure P, the P of this reservoir are lower than Po and for P
4, P
5, P
6maximal value in Pn;
Three, using P as back pressure, carry out mixed phase between simulation well and drive experiment, draw carbon dioxide mixed phase and drive regional distribution chart.
Measure above-mentioned minimum miscibility pressure, a kind of THE MINIMUM MISCIBLE PRESSURE device need be used, this device comprises the minimum miscibility pressure test suite of feeder system, carbon dioxide and crude oil minimum miscibility pressure test suite, carbon dioxide and the crude oil under complete contact conditions in tubule and carbon dioxide and minimum miscibility pressure test suite, gasometer and the liquid meter of crude oil in natural core, wherein: described feeder system, comprise carbon dioxide provisioning component and contain rock gas oil supply assembly.
Described carbon dioxide provisioning component, comprise carbon dioxide constant voltage constant speed pump, carbon dioxide holding tank and carbon dioxide flow integrating instrument, described carbon dioxide constant voltage constant speed delivery side of pump is connected with the source line of carbon dioxide holding tank, and the outlet of carbon dioxide holding tank is connected with the source line of carbon dioxide flow integrating instrument.
Described containing rock gas oil supply assembly, comprise containing rock gas crude oil constant voltage constant speed pump, piston container and contain rock gas oil flow integrating instrument, the described rock gas crude oil constant voltage constant speed delivery side of pump that contains is connected with the source line be equipped with containing the piston container of rock gas crude oil, and the outlet of this piston container is led to and is connected with the source line containing rock gas oil flow integrating instrument.
Described carbon dioxide and the crude oil minimum miscibility pressure test suite under complete contact conditions, comprise high-temperature and high-pressure visual device and tapping valve, above-mentioned carbon dioxide flow integrating instrument and being all connected with the source line of high-temperature and high-pressure visual device containing the outlet of rock gas oil flow integrating instrument, the outlet of high-temperature and high-pressure visual device is connected with liquid inlet tee joint pipeline, one of them outlet of liquid inlet tee joint is connected with tapping valve pipeline, the discharge pipe of tapping valve connects gasometer and liquid meter, another discharge pipe of liquid inlet tee joint connects carbon dioxide and the minimum miscibility pressure test suite of crude oil in tubule.
Described carbon dioxide and the crude oil minimum miscibility pressure test suite in tubule, comprises tubule valve, back-up sand tubule, tubule mixed phase monitor, tubule tapping valve, capillary pressure monitor and tubule check valve; The entrance of described tubule valve is connected with the discharge pipe of above-mentioned liquid inlet tee joint, the outlet of tubule valve is connected with the source line of back-up sand tubule, the endpiece of back-up sand tubule is connected with the source line of tubule mixed phase monitor, the discharge pipe connecting tee of tubule mixed phase monitor, a discharge pipe of threeway connects tubule tapping valve, the outlet of tubule tapping valve is connected with the source line of capillary pressure monitor, the outlet of capillary pressure monitor is connected with the source line of tubule check valve, and the discharge pipe of tubule check valve connects gasometer and liquid meter; Another discharge pipe of threeway connects carbon dioxide and the minimum miscibility pressure test suite of crude oil in natural core.
Described carbon dioxide and the crude oil minimum miscibility pressure test suite in natural core, comprise some test cells, all test cells are connected in parallel, and the number of the different permeable layer that the quantity of test cell is divided by the nonuniformity of actual reservoir determines; Each test cell concrete, comprises rock core by-pass valve control, permeability is K
xnatural core, rock core mixed phase monitor, rock core pressure monitor and check valve, wherein K
xbe permeability be K
1, K
2, K
3, K
4k
nin one, the source line connecting tee of above-mentioned rock core operation valve, the discharge pipe of rock core operation valve connects the injection side of natural core, the production end of natural core is connected with the source line of rock core mixed phase monitor, the outlet of rock core mixed phase monitor is connected with the source line of rock core pressure monitor, the outlet of rock core pressure monitor is connected with the source line of rock core check valve, and the discharge pipe of rock core check valve connects gasometer and liquid meter.
Above-mentioned tapping valve, tubule minimum miscibility pressure test suite, natural core minimum miscibility pressure test suite, gasometer and liquid meter are all laid in thermostat.
The present invention measures in the method in the best miscible pressure of carbon dioxide between injection-production well and mixed phase region, the test carbon dioxide described in step one (1) and the minimum miscibility pressure P being issued to mixed phase containing rock gas crude oil at complete contact conditions
1, concrete method of testing is:
1, the feeder system in THE MINIMUM MISCIBLE PRESSURE device, completely contact minimum miscibility pressure test suite, gasometer and liquid meter are fitted together;
2, the temperature of high-temperature and high-pressure visual device and thermostat is set;
3, open containing rock gas crude oil constant voltage constant speed pump and carbon dioxide constant voltage constant speed pump, in high-temperature and high-pressure visual device injecting carbon dioxide with containing rock gas crude oil, by containing the injection rate IR of rock gas crude oil and the injection rate IR of carbon dioxide containing Parameter Compensation of Natural Gas Flow Measuring and carbon dioxide flow integrating instrument record, controlled the discharge of the waste liquid in test process by tapping valve;
4, constantly stir carbon dioxide by high-temperature and high-pressure visual device and contain rock gas crude oil system;
5, carbon dioxide and the mixed phase situation containing rock gas crude oil system is observed by the visual observation probe of high-temperature and high-pressure visual device, determine minimum miscibility pressure when this system reaches mixed phase, namely obtain carbon dioxide and the minimum miscibility pressure P of crude oil under complete contact conditions
1.
The present invention measures in the method in the best miscible pressure of carbon dioxide between injection-production well and mixed phase region, the test carbon dioxide described in step one (2) and the minimum miscibility pressure P reaching mixed phase containing rock gas crude oil in back-up sand tubule
2, concrete method of testing is:
1, the feeder system in THE MINIMUM MISCIBLE PRESSURE device, completely contact minimum miscibility pressure test suite, tubule minimum miscibility pressure test suite, gasometer and liquid meter are assembled, close tapping valve;
2, close tubule tapping valve, regulate tubule check valve, this system back pressure is set as P
1;
3, open tubule tapping valve and tubule operation valve, utilize tubule operation valve control enabling of this device and close, tubule mixed phase monitor is in order to monitor the carbon dioxide in back-up sand tubule and the mixed phase situation containing rock gas crude oil system; System pressure in capillary pressure monitor monitors system mixed phase process; Tubule check valve controls the back pressure in this test process; Tubule tapping valve controls the trend of fluid and the discharge of waste liquid in test process;
4, the carbon dioxide reaching mixed phase in high-temperature and high-pressure visual device is injected back-up sand tubule with containing rock gas crude oil system;
5, by tubule mixed phase monitor monitors carbon dioxide and containing the mixed phase situation of rock gas crude oil system in back-up sand tubule, if system does not reach mixed phase, namely the injection rate IR then improving carbon dioxide changes carbon dioxide and the injection ratio containing rock gas crude oil, until observe that in tubule mixed phase monitor carbon dioxide reaches mixed phase with containing rock gas crude oil system;
Minimum miscibility pressure when 6, determining carbon dioxide in these cases and reach mixed phase containing rock gas crude oil system, namely obtains carbon dioxide and the minimum miscibility pressure P being issued to mixed phase containing rock gas crude oil in the pore throat condition of amplification
2.
The present invention measures in the method in the best miscible pressure of carbon dioxide between injection-production well and mixed phase region, the test carbon dioxide described in step 2 (1) and the minimum miscibility pressure P reaching mixed phase containing rock gas crude oil in the natural core of different permeability
nand the actual minimum miscibility pressure Pm of this reservoir, concrete method of testing is:
1, the tapping valve in THE MINIMUM MISCIBLE PRESSURE device, tubule tapping valve are closed;
2, according to the plain heterogeneity situation of actual reservoir one group of injection-production well, determine the permeability distribution situation of this actual reservoir, and then determine the permeability K of natural core of this reservoir
1, K
2, K
3, K
4k
n;
3, testing permeability is K
1the minimum miscibility pressure P of natural core
3, in closing carbon dioxide and the crude oil minimum miscibility pressure test suite in natural core, permeability is respectively K
2, K
3, K
4k
nthe rock core by-pass valve control of test cell;
1.
,close tubule operation valve, adjustment permeability is K
1rock core check valve, this system back pressure is set as P
2;
2., opening permeability is K
1rock core operation valve, rock core operation valve controls enabling of this device and closes, and rock core mixed phase monitor can monitor carbon dioxide in natural core and the mixed phase situation containing rock gas crude oil system; Rock core pressure monitor is in order to the system pressure in monitoring system mixed phase process; Rock core check valve is in order to control the back pressure in this test process;
3. be, K by the carbon dioxide reaching mixed phase in back-up sand tubule with injecting permeability containing rock gas crude oil system
1natural core in;
4., by rock core mixed phase monitor monitors carbon dioxide and containing the mixed phase situation of rock gas crude oil system in natural core, if system does not reach mixed phase, namely the injection rate IR then improving carbon dioxide changes carbon dioxide and the injection ratio containing rock gas crude oil, until observe that in rock core mixed phase monitor carbon dioxide reaches mixed phase with containing rock gas crude oil system;
5. the minimum miscibility pressure, when determining carbon dioxide in these cases and reach mixed phase containing rock gas crude oil system, obtains carbon dioxide and the minimum miscibility pressure P containing rock gas crude oil in actual natural core
3;
4, repeat step 3, test permeability is K
2, K
3, K
4k
nthe minimum miscibility pressure P of natural core
4, P
5, P
6pn;
5, determine that actual minimum miscibility pressure Pm, the Pm of this reservoir are P
4, P
5, P
6value maximum in Pn.
The present invention measures in the method in the best miscible pressure of carbon dioxide between injection-production well and mixed phase region, and between the simulation well described in step 3, mixed phase drives experiment, and concrete experimental technique is:
(1) mixed phase driving device between connecting analog well, wherein the order of connection of the natural core of variant permeability and the distribution situation of actual reservoir consistent, length ratio is also according to distribution proportion between real well;
(2) be K by permeability
1, K
2, K
3, K
4k
nnatural core respectively this actual reservoir saturated containing rock gas crude oil;
(3) compare the size of the minimum miscibility pressure of the variant pervious course of this reservoir and the parting pressure Po of this actual reservoir, determine that best miscible pressure P, the P of this reservoir are lower than Po and for P
4, P
5, P
6higher value in Pn;
(4) regulate check valve, the pressure arranging check valve is P;
(5) open carbon dioxide constant voltage constant speed pump, carry out carbon dioxide mixed phase and drive experiment, determined the mixed phase situation of the natural core of variant permeability by observation rock core mixed phase monitor and pressure monitor;
(6) draw carbon dioxide mixed phase according to the mixed phase situation of the natural core of variant permeability and drive distribution situation figure.
Beneficial effect:
Experimental provision of the present invention and method can overcome current high-temperature and high-pressure visual device and the actual deviation of testing minimum miscibility pressure and producing of slim-tube test technology, can apparatus and method can grasp identical carbon dioxide realize mixed phase from crude oil in the different permeability zones of actual reservoir, be conducive to oil-gas field development worker and grasp identical carbon dioxide and the pressure needed for the mixed phase of crude oil system in actual heterogeneous reservoir different pore structures, namely can obtain the minimum miscibility pressure of actual heterogeneous reservoir; The present invention can simulate actual heterogeneous reservoir and carry out carbon dioxide mixed phase and drive, and experimentally result is drawn carbon dioxide mixed phase and driven distribution situation figure, is conducive to numerical simulation and applies.
Accompanying drawing explanation
Fig. 1 is the structural representation that multimode of the present invention measures the device of carbon dioxide minimum miscibility pressure.
Fig. 2 is test minimum miscibility pressure P
1plant system drawing.
Fig. 3 is that the camera in test experiments test in high-temperature and high-pressure visual device cylinder is looked up at lower 45 ° and taken measurement of an angle.
Fig. 4 is that the camera in experiment test in high-temperature and high-pressure visual device cylinder is overlooked at upper 135 ° and taken measurement of an angle.
Fig. 5 is test minimum miscibility pressure P
2plant system drawing.
Fig. 6 is the plant system drawing of test minimum miscibility pressure Pn.
Fig. 7 is mixed phase driving device figure between simulation well.
Fig. 8 is the minimum miscibility pressure of the variant pervious course of reservoir and the comparison diagram of parting pressure in embodiment 1.
Fig. 9 is that in embodiment 1, carbon dioxide mixed phase drives pressure-plotting.
Figure 10 is that in embodiment 1, carbon dioxide mixed phase drives mixed phase distribution plan.
Embodiment
Below in conjunction with accompanying drawing, the structure composition of apparatus of the present invention and annexation are described further:
As shown in Figure 1: a kind of multimode measures the device of carbon dioxide minimum miscibility pressure, comprise feeder system, contact minimum miscibility pressure test suite, tubule minimum miscibility pressure test suite and natural core minimum miscibility pressure test suite, gasometer 26 and liquid meter 27 completely, wherein:
Described feeder system, comprises carbon dioxide provisioning component and contains rock gas oil supply assembly.
Described carbon dioxide provisioning component, comprise carbon dioxide constant voltage constant speed pump 1, carbon dioxide holding tank 3 and carbon dioxide flow integrating instrument 5, the outlet of described carbon dioxide constant voltage constant speed pump 1 is connected with the source line of carbon dioxide holding tank 3, the outlet of carbon dioxide holding tank 3 is connected with the source line of carbon dioxide flow integrating instrument 5, the injection rate IR acting as monitoring carbon dioxide of carbon dioxide flow integrating instrument 5.
Described containing rock gas oil supply assembly, comprise containing rock gas crude oil constant voltage constant speed pump 2, piston container 4 and contain rock gas oil flow integrating instrument 6, the described outlet containing rock gas crude oil constant voltage constant speed pump 2 is connected with the source line be equipped with containing the piston container 4 of rock gas crude oil, the outlet of this piston container 4 is connected with the source line containing rock gas oil flow integrating instrument 6, act as containing rock gas oil flow integrating instrument 6 injection rate IR that monitoring contains rock gas crude oil.
Described carbon dioxide and the crude oil minimum miscibility pressure test suite under complete contact conditions, comprise high-temperature and high-pressure visual device 7 and tapping valve 9, carbon dioxide flow integrating instrument 5 and being all connected with the source line of high-temperature and high-pressure visual device 7 containing the outlet of rock gas oil flow integrating instrument 6, the outlet of high-temperature and high-pressure visual device 7 is connected with liquid inlet tee joint 29 pipeline, one of them outlet of liquid inlet tee joint 29 is connected with tapping valve 9 pipeline, the discharge pipe of tapping valve 9 connects gasometer 26 and liquid meter 27, another discharge pipe of liquid inlet tee joint 29 connects carbon dioxide and the minimum miscibility pressure test suite of crude oil in tubule.
Described carbon dioxide and the crude oil minimum miscibility pressure test suite in tubule, comprises tubule valve 10, back-up sand tubule 11, tubule mixed phase monitor 12, tubule tapping valve 13, capillary pressure monitor 14 and tubule check valve 15, the entrance of above-mentioned tubule valve 10 is connected with the discharge pipe of liquid inlet tee joint 29, the outlet of tubule valve 10 is connected with the source line of back-up sand tubule 11, the endpiece of back-up sand tubule 11 is connected with the source line of tubule mixed phase monitor 12, the discharge pipe connecting tee 30 of tubule mixed phase monitor 12, a discharge pipe of threeway 30 connects tubule tapping valve 13, the outlet of tubule tapping valve 13 is connected with the source line of capillary pressure monitor 14, the outlet of capillary pressure monitor 14 is connected with the source line of tubule check valve 15, the discharge pipe of tubule check valve 15 connects gasometer 26 and liquid meter 27, another discharge pipe of threeway 30 connects carbon dioxide and the minimum miscibility pressure test suite of crude oil in natural core.
Described carbon dioxide and the crude oil minimum miscibility pressure test suite in natural core, comprise some test cells, all test cells are in parallel, the number of the different permeable layer that the quantity of test cell is divided by the nonuniformity of actual reservoir determines, specifically according to the plain heterogeneity situation of actual reservoir one group of injection-production well, determine the permeability distribution situation of this actual reservoir, and then determine the permeability K of natural core of this reservoir
1, K
2, K
3, K
4k
n, K
nin n be test cell number.
Each test cell concrete, comprises rock core by-pass valve control 16, permeability K
xnatural core 17, rock core mixed phase monitor 18, rock core pressure monitor 19 and rock core check valve 20, wherein K
xbe permeability be K
1, K
2, K
3, K
4k
nin one, the source line connecting tee 30 of above-mentioned rock core operation valve 16, the outlet of rock core operation valve 16 is connected with the injection side pipeline of natural core 17, the production end of natural core 17 is connected with the source line of rock core mixed phase monitor 18, the outlet of rock core mixed phase monitor 18 is connected with the source line of rock core pressure monitor 19, the outlet of rock core pressure monitor 19 is connected with the source line of rock core check valve 20, and the discharge pipe of rock core check valve 20 connects gasometer 26 and liquid meter 27.
The minimum miscibility pressure test suite of above-mentioned tapping valve 9, carbon dioxide and crude oil minimum miscibility pressure test suite, carbon dioxide and the crude oil in tubule in natural core, gasometer 26 and liquid meter 27 are all laid in thermostat 8.
The method using this covering device to measure the best miscible pressure of actual reservoir is described below in conjunction with concrete example, and one step simulation of going forward side by side research mixed phase drives the actual state between well, draws carbon dioxide mixed phase and drives regional distribution chart
Embodiment 1
What the present embodiment used contains rock gas crude oil, and under temperature is 45 DEG C of conditions, viscosity of crude is 9.8mPas, and the parting pressure of this reservoir is 29.5MPa, and the permeability number between a certain injection-production well of this reservoir is 5, is respectively K
3: 2000 × 10
-3μm
2, K
4: 1800 × 10
-3μm
2, K
5: 1500 × 10
-3μm
2, K
6: 1000 × 10
-3μm
2, K
7: 800 × 10
-3μm
2;
The tubule mixed phase monitor, capillary pressure monitor, rock core mixed phase monitor and the rock core pressure monitor that used are model that Shanghai Micronics Inc. the produces gas chromatograph that is GC9310; Interpolation reagent flow integrating instrument, carbon dioxide flow integrating instrument are the XSFT-LCD Chinese type flow integrator that Sisam SA produces; The constant voltage constant speed pump used is the HSB-1 type high pressure constant speed and constant pressure pump that Haian Oil Scientific Research Apparatus Co., Ltd. produces; High-temperature and high-pressure visual device, this equipment is produced by French company, and model is 240/1000FV.
1, high-temperature and high-pressure visual device to test carbon dioxide and the minimum miscibility pressure P containing rock gas crude oil is used
1
Test minimum miscibility pressure P
1, only need use the part system in apparatus of the present invention, specifically as shown in Figure 2.
Concrete testing procedure is:
(1) temperature setting high-temperature and high-pressure visual device 7 and thermostat 8 is 45 DEG C;
(2) discharge of the waste liquid in test process is controlled by tapping valve 9;
(3) open containing rock gas crude oil constant voltage constant speed pump 2 and carbon dioxide constant voltage constant speed pump 1, in high-temperature and high-pressure visual device 7, injection ratio is the carbon dioxide of 4:5 and contains rock gas crude oil, by recording containing the injection rate IR of rock gas crude oil and the injection rate IR of carbon dioxide containing Parameter Compensation of Natural Gas Flow Measuring 6 and carbon dioxide flow integrating instrument 5, be respectively 40ml and 50ml;
(4) high-temperature and high-pressure visual device 7 constantly stirs carbon dioxide and contains rock gas crude oil system;
(5) by the visual observation of high-temperature and high-pressure visual device 7 pop one's head in (computer screen display) observe carbon dioxide with containing the mixed phase situation of rock gas crude oil system, choice experiment takes measurement of an angle as shown in Figures 3 and 4;
Observe carbon dioxide and contain rock gas crude oil system, thus determining the minimum miscibility pressure of the two.Carbon dioxide is with containing rock gas crude oil, in the process injected, the two is what to separate, therebetween there is obvious phase interface, when this carbon dioxide is with when reaching mixed phase containing rock gas crude oil system, phase interface between the two disappears, thus minimum miscibility pressure when determining that this system reaches mixed phase is 15.6MPa, namely obtains carbon dioxide and the minimum miscibility pressure P of crude oil under abundant contact conditions
1for 15.6MPa.
2, high-temperature and high-pressure visual device and carbon dioxide and the minimum miscibility pressure test suite of crude oil in tubule is used to test minimum miscibility pressure P
2
Test above-mentioned minimum miscibility pressure P
2, only need use the part system in apparatus of the present invention, specifically as shown in Figure 5.
Concrete testing procedure is:
(1) close tubule tapping valve 13, regulate tubule check valve 15, this system back pressure is set as 15.6MPa;
(2) tubule operation valve 10 is opened;
(3) carbon dioxide is injected back-up sand tubule 11 with containing rock gas crude oil system, carbon dioxide is 4:5 with the injection ratio containing rock gas crude oil;
(4) monitor carbon dioxide by tubule mixed phase monitor 12 and contain the mixed phase situation of rock gas crude oil system in back-up sand tubule 11, discovery system does not reach mixed phase, namely the injection rate IR then improving carbon dioxide changes carbon dioxide and the injection ratio containing rock gas crude oil, observes that carbon dioxide reaches mixed phase with containing rock gas crude oil system when carbon dioxide is 5:5 with the injection ratio containing rock gas crude oil;
(5) determine that carbon dioxide is 18.7MPa with minimum miscibility pressure when reaching mixed phase containing rock gas crude oil system in these cases, namely obtains carbon dioxide and the minimum miscibility pressure P being issued to mixed phase containing rock gas crude oil in the pore throat condition of amplification
2for 18.7MPa.
3, minimum miscibility pressure test suite in tubule of high-temperature and high-pressure visual device, carbon dioxide and crude oil and carbon dioxide and the minimum miscibility pressure test suite of crude oil in natural core is used to test the minimum miscibility pressure of complete mixed phase in natural core
pm;
(1) according to the plain heterogeneity situation of actual reservoir one group of injection-production well, determine that the permeability of the natural core of this reservoir is 2000 × 10
-3μm
2, 1800 × 10
-3μm
2, 1500 × 10
-3μm
2, 1000 × 10
-3μm
2, 800 × 10
-3μm
2;
(2) testing permeability is 2000 × 10
-3μm
2the minimum miscibility pressure of natural core; Test described minimum miscibility pressure P
3, only need use the part system in apparatus of the present invention, specifically as shown in Figure 6;
1) close tubule operation valve 10, regulate rock core check valve 20, this system back pressure is set as 18.7MPa;
2) rock core operation valve 16 is opened;
3) carbon dioxide is injected back-up sand tubule 11 with containing rock gas crude oil system, carbon dioxide is 4:5 with the injection ratio containing rock gas crude oil;
4) monitor carbon dioxide by rock core mixed phase monitor 12 and contain the mixed phase situation of rock gas crude oil system in natural core 17, if system does not reach mixed phase, namely the injection rate IR then improving carbon dioxide changes carbon dioxide and the injection ratio containing rock gas crude oil, observes that carbon dioxide reaches mixed phase with containing rock gas crude oil system when carbon dioxide is 6:5 with the injection ratio containing rock gas crude oil;
5) minimum miscibility pressure 21.3MPa when determining carbon dioxide in these cases and reach mixed phase containing rock gas crude oil system, obtains carbon dioxide and the minimum miscibility pressure P containing rock gas crude oil in actual natural core
3for 21.3MPa;
(3) repeat (1), (2) in step 4, test permeability is 1800 × 10
-3μm
2, 1500 × 10
-3μm
2, 1000 × 10
-3μm
2, 800 × 10
-3μm
2the minimum miscibility pressure P of correspondence of natural core
4for 23.4MPa, P
5for 25.7MPa, P
6for 28.4MPa, P
7for 31.7Mpa;
(4) actual minimum miscibility pressure Pm, the Pm of this reservoir are 31.7MPa.
4, the distribution situation between well is driven according to permeability distribution modeling effort mixed phase between injection-production well
(1) be 2000 × 10 by permeability
-3μm
2, 1800 × 10
-3μm
2, 1500 × 10
-3μm
2, 1000 × 10
-3μm
2, 800 × 10
-3μm
2natural core respectively this actual reservoir saturated containing rock gas crude oil;
(2) as mixed phase driving device figure between Fig. 7 connecting analog well, in figure: 32, permeability is 2000 × 10
-3μm
2natural core; 33, permeability is 2000 × 10
-3μm
2the mixed phase monitor of natural core; 34, permeability is 2000 × 10
-3μm
2the pressure monitor of natural core; 35, permeability is 1800 × 10
-3μm
2natural core; 36, permeability is 1800 × 10
-3μm
2the mixed phase monitor of natural core; 37, permeability is 1800 × 10
-3μm
2the pressure monitor of natural core; 38, permeability is respectively 1500 × 10
-3μm
2, 1000 × 10
-3μm
2, 800 × 10
-3μm
2natural core and the mixed phase monitor corresponding with it and pressure monitor; 39, check valve.Require in figure that the order of connection of the natural core of variant permeability is consistent with the distribution situation of actual reservoir, length ratio is also according to distribution proportion between real well;
(3) compare the size of the minimum miscibility pressure of the variant pervious course of this reservoir and the parting pressure of this actual reservoir, as shown in Figure 8, determine that the best miscible pressure P of this reservoir is 28.4MPa;
(4) regulate check valve, the pressure arranging check valve is 28.4MPa;
(5) open carbon dioxide constant voltage constant speed pump, carry out carbon dioxide mixed phase and drive experiment, determined the mixed phase situation of the natural core of variant permeability by observation rock core mixed phase monitor and pressure monitor;
(6) permeability is 2000 × 10
-3μm
2natural core mixed phase monitor in observe system and reach mixed phase, the pressure of the pressure monitor display of the natural core that permeability is is 23.1MPa, also illustrates that this system reaches mixed phase; Permeability is 1800 × 10
-3μm
2natural core mixed phase monitor in observe system and reach mixed phase, the pressure of the pressure monitor display of the natural core that permeability is is 25.6MPa, also illustrates that this system reaches mixed phase; Permeability is 1500 × 10
-3μm
2natural core mixed phase monitor in observe system and reach mixed phase, permeability is 1500 × 10
-3μm
2natural core pressure monitor display pressure be 27.5MPa, also illustrate that this system reaches mixed phase; Permeability is 1000 × 10
-3μm
2natural core mixed phase monitor in observe system and reach mixed phase, permeability is 1000 × 10
-3μm
2natural core pressure monitor display pressure be 29.4MPa, also illustrate that this system reaches mixed phase; Permeability is 800 × 10
-3μm
2natural core mixed phase monitor in observe system for reaching mixed phase but close to mixed phase, permeability is 800 × 10
-3μm
2the pressure of pressure monitor display of natural core be 30.1MPa, and its minimum miscibility pressure is 31.7MPa, also illustrates that this system not yet reaches mixed phase but close to mixed phase.
5, draw carbon dioxide mixed phase according to the mixed phase situation of the natural core of variant permeability and drive distribution situation figure
1) experimentally result draws pressure-plotting, as shown in Figure 9;
In figure, from left to right pressure becomes large, and figure intermediate data is the minimum miscibility pressure in this region;
2) according to the mixed phase monitor monitors of pressure distribution Fig. 9 and reality to mixed phase situation draw carbon dioxide mixed phase and drive distribution plan, as shown in Figure 10.
Beating hatched parts in figure is that carbon dioxide does not reach mixed phase region with containing rock gas crude oil, and namely permeability is 800 × 10
-3μm
2region system do not reach mixed phase.The carbon dioxide of Injection Well permeability band different from extraction well and the mixed phase situation containing rock gas crude oil can be found out clearly by Figure 10.
Claims (5)
1. measure the method in the best miscible pressure of carbon dioxide between injection-production well and mixed phase region, concrete steps are:
One, carbon dioxide is made under different pore throat condition, successively to contact with containing rock gas crude oil the minimum miscibility pressure reaching mixed phase to test under different pore throat condition
(1) carbon dioxide and the minimum miscibility pressure P being issued to mixed phase containing rock gas crude oil at complete contact conditions is tested
1;
(2) by above-mentioned minimum miscibility pressure P
1as back pressure, test carbon dioxide and the minimum miscibility pressure P being issued to mixed phase containing the rock gas crude oil situation that namely pore throat amplifies in back-up sand tubule
2;
Two, according to the plane heterogeneity between the Injection Well of actual reservoir to extraction well, test the carbon dioxide of this reservoir under the natural core pore throat of different permeability and the actual minimum miscibility pressure Pm containing rock gas crude oil, obtain the best miscible pressure P of this reservoir
(1) by P
2as back pressure, test carbon dioxide and contain the minimum miscibility pressure that rock gas crude oil reaches mixed phase in the natural core of different permeability, obtain carbon dioxide and in the small pore throat of reality, namely contact the carbon dioxide in basic fully situation with crude oil and contain the minimum miscibility pressure P of rock gas crude oil
3, P
4, P
5, P
6pn,
nfor the number of the different permeabilities of actual reservoir, P
3, P
4, P
5, P
6numerical value Pm maximum in Pn is the actual minimum miscibility pressure of reservoir;
(2) P is compared
3, P
4, P
5, P
6the parting pressure Po of Pn and corresponding actual reservoir, determines that best miscible pressure P, the P of this reservoir are lower than Po and for P
4, P
5, P
6maximal value in Pn;
Three, using P as back pressure, carry out mixed phase between simulation well and drive experiment, draw carbon dioxide mixed phase and drive regional distribution chart.
2. the method in the best miscible pressure of carbon dioxide and mixed phase region between mensuration injection-production well according to claim 1, is characterized in that: the test carbon dioxide described in step one (1) and the minimum miscibility pressure P being issued to mixed phase containing rock gas crude oil at complete contact conditions
1, concrete method of testing is:
1, the feeder system in THE MINIMUM MISCIBLE PRESSURE device, completely contact minimum miscibility pressure test suite, gasometer and liquid meter are fitted together;
2, the temperature of high-temperature and high-pressure visual device and thermostat is set;
3, open containing rock gas crude oil constant voltage constant speed pump and carbon dioxide constant voltage constant speed pump, in high-temperature and high-pressure visual device injecting carbon dioxide with containing rock gas crude oil, by containing the injection rate IR of rock gas crude oil and the injection rate IR of carbon dioxide containing Parameter Compensation of Natural Gas Flow Measuring and carbon dioxide flow integrating instrument record, controlled the discharge of the waste liquid in test process by tapping valve;
4, constantly stir carbon dioxide by high-temperature and high-pressure visual device and contain rock gas crude oil system;
5, carbon dioxide and the mixed phase situation containing rock gas crude oil system is observed by the visual observation probe of high-temperature and high-pressure visual device, determine minimum miscibility pressure when this system reaches mixed phase, namely obtain carbon dioxide and the minimum miscibility pressure P of crude oil under complete contact conditions
1.
3. the method in the best miscible pressure of carbon dioxide and mixed phase region between mensuration injection-production well according to claim 1, is characterized in that: the test carbon dioxide described in step one (2) and the minimum miscibility pressure P reaching mixed phase containing rock gas crude oil in back-up sand tubule
2, concrete method of testing is:
1, the feeder system in THE MINIMUM MISCIBLE PRESSURE device, completely contact minimum miscibility pressure test suite, tubule minimum miscibility pressure test suite, gasometer and liquid meter are assembled, close tapping valve;
2, close tubule tapping valve, regulate tubule check valve, this system back pressure is set as P
1;
3, open tubule tapping valve and tubule operation valve, utilize tubule operation valve control enabling of this device and close, tubule mixed phase monitor is in order to monitor the carbon dioxide in back-up sand tubule and the mixed phase situation containing rock gas crude oil system; System pressure in capillary pressure monitor monitors system mixed phase process; Tubule check valve controls the back pressure in this test process; Tubule tapping valve controls the trend of fluid and the discharge of waste liquid in test process;
4, the carbon dioxide reaching mixed phase in high-temperature and high-pressure visual device is injected back-up sand tubule with containing rock gas crude oil system;
5, by tubule mixed phase monitor monitors carbon dioxide and containing the mixed phase situation of rock gas crude oil system in back-up sand tubule, if system does not reach mixed phase, namely the injection rate IR then improving carbon dioxide changes carbon dioxide and the injection ratio containing rock gas crude oil, until observe that in tubule mixed phase monitor carbon dioxide reaches mixed phase with containing rock gas crude oil system;
Minimum miscibility pressure when 6, determining carbon dioxide in these cases and reach mixed phase containing rock gas crude oil system, namely obtains carbon dioxide and the minimum miscibility pressure P being issued to mixed phase containing rock gas crude oil in the pore throat condition of amplification
2.
4. the method in the best miscible pressure of carbon dioxide and mixed phase region between mensuration injection-production well according to claim 1, is characterized in that: the test carbon dioxide described in step 2 (1) reaches the minimum miscibility pressure P of mixed phase in the natural core of different permeability with containing rock gas crude oil
nand the actual minimum miscibility pressure Pm of this reservoir, concrete method of testing is:
1, the tapping valve in THE MINIMUM MISCIBLE PRESSURE device, tubule tapping valve are closed;
2, according to the plain heterogeneity situation of actual reservoir one group of injection-production well, determine the permeability distribution situation of this actual reservoir, and then determine the permeability K of natural core of this reservoir
1, K
2, K
3, K
4k
n;
3, testing permeability is K
1the minimum miscibility pressure P of natural core
3, in closing carbon dioxide and the crude oil minimum miscibility pressure test suite in natural core, permeability is respectively K
2, K
3, K
4k
nthe rock core by-pass valve control of test cell;
1.
,close tubule operation valve, adjustment permeability is K
1rock core check valve, this system back pressure is set as P
2;
2., opening permeability is K
1rock core operation valve, rock core operation valve controls enabling of this device and closes, and rock core mixed phase monitor can monitor carbon dioxide in natural core and the mixed phase situation containing rock gas crude oil system; Rock core pressure monitor is in order to the system pressure in monitoring system mixed phase process; Rock core check valve is in order to control the back pressure in this test process;
3. be, K by the carbon dioxide reaching mixed phase in back-up sand tubule with injecting permeability containing rock gas crude oil system
1natural core in;
4., by rock core mixed phase monitor monitors carbon dioxide and containing the mixed phase situation of rock gas crude oil system in natural core, if system does not reach mixed phase, namely the injection rate IR then improving carbon dioxide changes carbon dioxide and the injection ratio containing rock gas crude oil, until observe that in rock core mixed phase monitor carbon dioxide reaches mixed phase with containing rock gas crude oil system;
5. the minimum miscibility pressure, when determining carbon dioxide in these cases and reach mixed phase containing rock gas crude oil system, obtains carbon dioxide and the minimum miscibility pressure P containing rock gas crude oil in actual natural core
3;
4, repeat step 3, test permeability is K
2, K
3, K
4k
nthe minimum miscibility pressure P of natural core
4, P
5, P
6pn;
5, determine that actual minimum miscibility pressure Pm, the Pm of this reservoir are P
4, P
5, P
6value maximum in Pn.
5. the method in the best miscible pressure of carbon dioxide and mixed phase region between mensuration injection-production well according to claim 1, it is characterized in that: between the simulation well described in step 3, mixed phase drives experiment, concrete experimental technique is:
(1) mixed phase driving device between connecting analog well, wherein the order of connection of the natural core of variant permeability and the distribution situation of actual reservoir consistent, length ratio is also according to distribution proportion between real well;
(2) be K by permeability
1, K
2, K
3, K
4k
nnatural core respectively this actual reservoir saturated containing rock gas crude oil;
(3) compare the size of the minimum miscibility pressure of the variant pervious course of this reservoir and the parting pressure Po of this actual reservoir, determine that best miscible pressure P, the P of this reservoir are lower than Po and for P
4, P
5, P
6higher value in Pn;
(4) regulate check valve, the pressure arranging check valve is P;
(5) open carbon dioxide constant voltage constant speed pump, carry out carbon dioxide mixed phase and drive experiment, determined the mixed phase situation of the natural core of variant permeability by observation rock core mixed phase monitor and pressure monitor;
(6) draw carbon dioxide mixed phase according to the mixed phase situation of the natural core of variant permeability and drive distribution situation figure.
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| CN111537549A (en) * | 2020-06-08 | 2020-08-14 | 北京大学 | Carbon dioxide flooding, storing and fracturing device with continuously-changed phase state and experimental method |
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Application publication date: 20160120 Assignee: Dongying Zhike Petroleum Technology Development Co.,Ltd. Assignor: DONGYING HEHUI PETROLEUM TECHNOLOGY CO.,LTD. Contract record no.: X2022980019396 Denomination of invention: A method for determining the optimum miscible pressure and miscible area of carbon dioxide between injection and production wells Granted publication date: 20161109 License type: Exclusive License Record date: 20221024 |