CN105548488B - The method of the actual mining site carbon dioxide long range foam flooding of simulation - Google Patents
The method of the actual mining site carbon dioxide long range foam flooding of simulation Download PDFInfo
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Abstract
The present invention relates to the method for simulating actual mining site carbon dioxide long range foam flooding, the method for this actual mining site carbon dioxide long range foam flooding of simulation：First, by testing well test mining site actual foam flooding distance and accounting for ratio between injection-production well；2nd, the preparation of rock core is spliced；3rd, by pressure test core holding unit fixed test rock intracardiac pressure, at core entry end, by certain gas-liquid mol ratio by CO2Constant pressure injection, the injection of foaming agent constant speed, fixation ends back pressure monitor the pressure of several test points, obtain the data of pressure and corresponding rock core distance；4th, fixed note adopts the foam advance distance detection under pressure；5th, long range foam flooding.The present invention can effectively realize the monitoring to foam system form, find the froth breaking position of foam, realize that many wheel stirrings generate foam again, so that actual foam flooding distance is promoted, effectively to simulate foam flooding driving situation between actual injection-production well.
Description
Technical field
The present invention relates to drive technology applied to carbon dioxide foaming in petroleum works field, and in particular to the actual mining site of simulation
The method of carbon dioxide long range foam flooding.
Background technology
It is an important tertiary oil recovery technology that carbon dioxide foaming, which drives, and it can reduce gas-oil ratio, expands swept volume,
Improve oil displacement efficiency.Foam flooding can effectively weaken the adverse effect that stickiness fingering and gravitational differentiation are brought, with single gas drive, table
Face surfactant flooding is compared, and it improves recovery ratio effect and is more clear.In actual field test, because reservoir pressure is higher, one
As be tens MPas, nature shear-mixed can cause foam flooding in injection well when gas and foaming agent flows in reservoir pore space
Exist behind bottom in relatively long distance, at this moment the distance that actual mining site can be reduced between injection-production well by way of beating Encryption Well also may be used
The complete foam flooding between injection-production well can be realized.All the time, laboratory experiment is all the pilot test of field test, laboratory experiment pair
The simulation of field test, which must is fulfilled for similarity criterion simulation, just has practical significance, but laboratory experiment foam flooding research at present is all
It is the influence for considering foam stability, gas liquid ratio, injection mode, compound system species and concentration, lacks consideration foam flooding in note
Being simulated by the complete foam flooding in terms of effect ratio or when how to simulate smaller injector producer distance between well is adopted, causes the reality to mining site
Directive significance is not enough, and laboratory experiment needs to consider mining site situation, is provided for mining site before experiment, effective mould in experiment
Intend, really mining site could be instructed to put into practice.
The content of the invention
It is an object of the invention to provide the method for simulating actual mining site carbon dioxide long range foam flooding, this simulation is actual
The method of mining site carbon dioxide long range foam flooding be used for solve for laboratory experiment realize the Lab-evaluation of complete foam flooding with
And relative to mining site simulation degree it is inadequate the problem of.
The technical solution adopted for the present invention to solve the technical problems is：This actual mining site carbon dioxide of simulation is over long distances
The method of foam flooding：
First, by testing well test mining site actual foam flooding distance and accounting for ratio between injection-production well：
Test well test actual bubble foam is laid between injection-production well and drives distance：Mining site real well is away from for L, first in actual injection-production well
Centre position L1Place, which is laid in a bite monitoring well, observation production fluid, whether there is foam, if L1Foam is not present in place, apart from L1-
A bite inspection well is laid at 10000mm, continues to observe with the presence or absence of foam in production fluid, if L1- 10000mm places are still not present
Foam, continuation will lay a bite inspection well apart from shortening successively at 10000mm, until observing in production fluid that there is foam is
Only；If L1There is foam in place, apart from L1Lay a bite inspection well in+10000mm places；Continue to observe in production fluid with the presence or absence of bubble
Foam, if L1Foam is still not present in+10000mm places, and continuation will lay a bite inspection well at often increase 10000mm, until
Observe untill foam is not present in production fluid；
It is L ' by the distance definition of actual monitoring to foam, then ratio is L '/L between foam flooding distance accounts for injection-production well；
2nd, the preparation of rock core is spliced：
Rock core is adopted as the cementing artificial core of quartz sand, and dimensions is 25 × 600mm of Φ, the permeability and hole of rock core
Degree is identical with actual reservoir situation in step one, and a portion rock core is cut into length for 450mm, 300mm, 200mm,
150mm, 100mm, 50mm, 30mm, 20 mm and the actual foam generation distance of some sections of follow-up tests of 10 mm are used；
3rd, by pressure test core holding unit fixed test rock intracardiac pressure, at core entry end, rubbed by certain gas-liquid
You compare CO2Constant pressure injection, the injection of foaming agent constant speed, fixation ends back pressure monitor the pressure of several test points, obtain pressure with
The data of corresponding rock core distance；
4th, fixed note adopts the foam advance distance detection under pressure：
1）Prepare splicing rock core, the rock core of a section splicing is put into core holding unit, carry out the evacuation saturation of rock core
Water；
2）Rock core saturated oils, above-mentioned rock core is put into froth breaking distance test core holding unit, in centre position L2Place adds
Enter foam detecting device；
3）The device of the actual mining site carbon dioxide long range foam flooding of connection simulation carries out CO2Foam flooding is tested, in device
Foam flooding core holding unit uses froth breaking distance test core holding unit；
4）Germicidal efficacy, opens monitoring valve, the fiber optic receiver that correlation fibre optical sensor coordinates is by fluid analysis data
It is reacted in data collecting system；
5）Analyze data, centre position L2Whether place has foam, and froth breaking position is in rear somewhere if having foam, if still
Foam then froth breaking position in front somewhere；
6）According to 5）Middle analysis result simultaneously combines principle of similarity, in the rock core L corresponding with actual mining site test position2+
40mm、L2+ 80mm ... or L2-40mm、L2- 80mm ... places continue to test, and observe the state of Produced Liquid, until finding froth breaking
Apart from L3；
5th, long range foam flooding：
1）Prepare splicing rock core, rock core is put into core holding unit, carry out the evacuation saturation water of rock core；
2）Rock core saturated oils；
3）Foam flooding core holding unit is adopted in the device of the actual mining site carbon dioxide long range foam flooding of connection simulation, device
Secondary agitation core holding unit is used, in froth breaking apart from L3Magnetic stirring apparatus is placed at place, and regulation rock core pressue device causes rock core pressure
Power is the reset pressure P, L at rock core froth breaking3A foam detecting device is placed respectively at+40 mm and rock core end；
4）Start Germicidal efficacy, foaming agent continues to foam by magnetic stirrer；Open L3Valve is detected at+40 mm,
It is then shut off L3Valve is detected at+40 mm, rock core end point detection valve is opened, displacing fluid outflow is passed through correlation fibre optical sensor
Fluid analysis data are reacted in data collecting system by the fiber optic receiver of cooperation；
5）Analyze data, L3Whether at+40 mm and rock core end has foam；If L3There is bubble at+40 mm and rock core end
Foam, then secondary agitation can stop experiment；If L3At+40 mm non-foam then froth breaking position in front somewhere；If L3At+40 mm
There is foam rock core end non-foam, then froth breaking position is in L3At+40 mm between rock core end；
6）According to 4）Middle analysis result is in L3+80 mm、L3+ 120 mm ... places continue to test, and observe the state of Produced Liquid,
Until finding froth breaking apart from L4, now the pressure of froth breaking position is P1；
7）Analysis result：If 1. L3+ L4=400 mm, then secondary agitation is that simulation field test 2/3 can be achieved to steep over long distances
Foam drives；If 2. L3+ L4The mm of ＞ 400, experiment continues, and reduces L3Locate magnetic stirring apparatus rotating speed, now L3Correspondence froth breaking distance is L5,
Wherein L3+ L5=400 mm；If 3. L3+ L4The mm of ＜ 400, experiment continues, in froth breaking distance（L3+ L4）Place magnetic agitation in place
Device, regulation rock core pressue device causes rock core pressure to be P1Triple mixing is carried out, determines froth breaking apart from L6If, L3+ L4+L6=400
Mm, then stop experiment, if L3+ L4+ L6The mm of ＞ 400, experimentation is with 2., if L3+ L4+ L6The mm of ＜ 400, then experimentation
Repeat to continue, until finding L3+ L4+ ...=400 mm, experiment terminates.
Pressure test core holding unit includes glass rock core clamping outer barrel, packing element in such scheme, and packing element is placed in glass rock
In heart clamping outer barrel, some sections of rock cores are placed in packing element, some sections of rock core formation splicing rock cores, simulation core is separately positioned on spelling
The two ends of rock core are connect, glass rock core clamps the seal joint that is provided at both ends with of outer barrel, wherein one end seal joint connection top lattice spiral shell
Bolt adjuster, stretches out from simulation core other end seal joint, and the annular space between packing element and glass rock core clamping outer barrel is
Confined pressure chamber, ring pressure load ports are arranged on the back that glass rock core clamps outer barrel, and the belly of glass rock core clamping outer barrel sets some
Individual monitoring holes, pressure monitor is inserted into packing element by one of monitoring holes, and T-shaped rigid seal plug is inserted into monitoring holes
It is interior；Pressure monitoring device has a upper end open, and the pressure-resistant glass tube of lower end closed, the bottom of pressure-resistant glass tube is provided with pressure
Power table and monitoring valve；Pushing up lattice bolt regulator has a closed cavity, and simulation core top lattice bolt is through cavity with simulating rock
The heart is fastened, and simulation core mozzle one end is extend into closed cavity, and the other end penetrates simulation core and is butted on rising for splicing rock core
Top, in addition a simulation core mozzle with splice rock core end communicate.
The device of actual mining site carbon dioxide long range foam flooding is simulated in such scheme to be included setting in insulating box, insulating box
It is equipped with foaming agent piston container, CO2Storage tank, foaming core holding unit, foam flooding core holding unit, liquid metering device, gas
Body metering device, foaming agent piston container, CO2Arrival end of the storage tank respectively with the core holding unit that foams is connected, and foam rock
The port of export of heart clamp holder leads to by six connects foam flooding core holding unit, six logical upper installation pressure gauges, the clamping of foam flooding rock core
Device connects gas-liquid separator, and gas-liquid separator connects liquid metering device and gas-metering device respectively, foaming agent piston container,
CO2Storage tank connects corresponding constant pressure constant speed pump respectively；Foam flooding core holding unit be froth breaking distance test core holding unit or
Secondary agitation core holding unit.
Froth breaking distance test core holding unit includes glass rock core clamping outer barrel, packing element in such scheme, and packing element is placed in glass
In glass rock core clamping outer barrel, some sections of rock cores are placed in packing element, some sections of rock core formation splicing rock cores, simulation core is set respectively
At the two ends of splicing rock core, glass rock core clamps the seal joint that is provided at both ends with of outer barrel, wherein one end seal joint connection top
Lattice bolt regulator, stretches out from simulation core other end seal joint, and the annular between packing element and glass rock core clamping outer barrel is empty
Between be confined pressure chamber, ring pressure load ports be arranged on glass rock core clamp outer barrel back, glass rock core clamping outer barrel belly set
Several monitoring holes, output liquid mozzle is inserted into packing element by one of monitoring holes, and T-shaped rigid seal plug is inserted into
In remaining monitoring holes, output liquid mozzle lower end is inserted into fluid collector, and correlation is provided with output liquid mozzle
Fibre optical sensor, back-pressure valve is arranged on below correlation fibre optical sensor, correlation fibre optical sensor connection computer, computer
Interior installation data acquisition system；Pushing up lattice bolt regulators has a closed cavity, simulation core top lattice bolt through cavity with
Simulation core is fastened, and simulation core mozzle one end is extend into closed cavity, and the other end penetrates simulation core and is butted on splicing rock
The initiating terminal of the heart, in addition a simulation core mozzle with splice rock core end communicate.
Secondary agitation core holding unit includes glass rock core clamping outer barrel, packing element in such scheme, and packing element is placed in glass rock
In heart clamping outer barrel, some sections of rock cores are placed in packing element, some sections of rock core formation splicing rock cores, simulation core is separately positioned on spelling
The two ends of rock core are connect, glass rock core clamps the seal joint that is provided at both ends with of outer barrel, wherein one end seal joint connection top lattice spiral shell
Bolt adjuster, stretches out from simulation core other end seal joint, and the annular space between packing element and glass rock core clamping outer barrel is
Confined pressure chamber, ring pressure load ports are arranged on the back that glass rock core clamps outer barrel initiating terminal, and the belly of glass rock core clamping outer barrel is set
Several monitoring holes are put, output liquid mozzle is inserted into packing element by two of which monitoring holes, T-shaped rigid seal plug insertion
Into remaining monitoring holes, output liquid mozzle lower end is inserted into fluid collector, is provided with output liquid mozzle to penetrating
Formula fibre optical sensor, back-pressure valve is arranged on below correlation fibre optical sensor, correlation fibre optical sensor connection computer, is calculated
Installation data acquisition system in machine；Pushing up lattice bolt regulator has a closed cavity, and simulation core top lattice bolt passes through cavity
Fastened with simulation core, simulation core mozzle one end is extend into closed cavity, and the other end penetrates simulation core and is butted on splicing
The initiating terminal of rock core, in addition a simulation core mozzle with splice rock core end communicate；Splice certain two rock core in rock core
Between be provided with waist drum shape magnetic stirring apparatus, forcing pipe is arranged on the top of waist drum shape magnetic stirring apparatus, and forcing pipe extend into packing element
It is interior, pressurization table and pressurizing valve are set on forcing pipe；The lower section of waist drum shape magnetic stirring apparatus sets bottom magnetic drive unit, and magnetic force is stirred
Mixing device includes waist drum shape hollow casing, and waist drum shape hollow casing is arranged in lucite cylinder, the outer wall cloth of waist drum shape hollow casing
Full conical tooth, waist drum shape hollow casing bottom sets cylinder-shaped magnet, and the half of cylinder-shaped magnet is N poles, and half is S poles, N poles
Set with S poles along substantially symmetrical about its central axis, lower roller ball is set below cylinder-shaped magnet, the top of waist drum shape hollow casing is set
Roller ball, upper roller ball and lower roller ball are engaged with lucite cylinder respectively, and lucite cylinder is the cylinder that left and right ends are opened
Body.
Bottom magnetic drive unit includes motor, azimuth axis, rotary shaft, insulation gear, magnetic-gear, orientation in such scheme
Axle is fixed on motor, and azimuth axis is connected with rotary shaft by conveyer belt, the other end connection insulation gear of rotary shaft, and insulate tooth
Wheel is engaged with magnetic-gear.
Forcing pipe and CO in such scheme2Storage tank is connected, and by adjusting pressurizing valve, observation back pressure meter causes after stirring
Foam may be advanced into froth breaking position.
T-shaped rigid seal plug is non-conductive high pressure resistant material in such scheme, and effect is to prevent tapping gas leakage pressure release.
The invention has the advantages that：
The present invention can effectively realize the monitoring to foam system form, find the froth breaking position of foam, realize that many wheels are stirred
Mix and generate foam again, so as to promote actual foam flooding distance, effectively to simulate foam flooding driving situation between actual injection-production well, give
Go out the accurate Displacement Efficiency at the scene of can simulating completely, under the technique by continuing many wheel stirrings, interior can be caused
Foam flooding is realized between long cores injection-production well, so that the complete foam flooding simulation in the case of simulating mining site Encryption Well.
Brief description of the drawings
Fig. 1 is structural representation of the invention；
Fig. 2 is the profile of froth breaking distance test core holding unit in the present invention；
Fig. 3 is the profile of secondary agitation core holding unit in the present invention；
Fig. 4 is the structural representation of bottom magnetic drive unit in the present invention；
Fig. 5 is Fig. 4 top view；
Fig. 6 is the front view of waist drum shape magnetic stirring apparatus in the present invention；
Fig. 7 is the top view of waist drum shape magnetic stirring apparatus in the present invention；
Fig. 8 is the right view of waist drum shape magnetic stirring apparatus in the present invention；
Fig. 9 is the structural representation of pressure test core holding unit in the present invention；
Figure 10 is pressure and corresponding rock core distance relation figure；
Figure 11 is the pressure and corresponding rock core distance relation figure of the simulation foam flooding of field test 2/3；
Figure 12 is the pressure and corresponding rock core distance relation figure of complete foam flooding.
In figure：1 insulating box, 2 foaming agent piston containers, 3 CO2Storage tank, 4 foaming core holding units, 5 six lead to, 6 foams
Drive core holding unit, 7 gas-liquid separators, 8 liquid metering devices, 9 gas-metering devices, 10 back-pressure valves, 11 constant pressure constant speed pumps, 12
Clamper base, 13 glass rock cores clamping outer barrel, 14 packing elements, 15 splicing rock cores, 16 simulation cores, 17 seal joints, 18 ring pressures
Load ports, 19 fix outer shroud, 20 output liquid mozzles, 21 plugs, 22 fluid collectors, 23 correlation fibre optical sensors, 24 meters
Calculation machine, 25 monitoring valves, 26 top lattice bolt regulators, 27 simulation core mozzles, 28 top lattice bolts, 29 detection valves, 30 magnetic force are stirred
Mix device, 31 forcing pipes, 32 pressurization tables, 33 pressurizing valves, 34 cylinder-shaped magnets, 35 times roller balls, roller ball, 37 motors, 38 on 36
Azimuth axis, 39 rotary shafts, 40 insulation gears, 41 magnetic-gears, 42 electric machine supports, 43 base platforms；44 pressure monitors；45 pressures
Power table；46 ring pressure valves；47 lucite cylinders.
Embodiment
The present invention is further illustrated below：
The method of this actual mining site carbon dioxide long range foam flooding of simulation：
The present invention is mainly the sliceable core experiment of section shape, constant pressure injection CO2Gas, while constant speed injects foaming agent
Solution.The existence of foam in rock core is observed using monitoring system, the froth breaking position L of foam is determined1, then using new rock core
Along actual long cores in froth breaking position L1Place sets agitating device, it is ensured that the secondary propulsion of bubble is stirred into, it is then determined that secondary bubble
The froth breaking position L of foam2, foam actual forward distance is promoted using same procedure successively until meeting simulation proportion requirement（Wherein
The rotating speed of agitating device can be adjusted according to required foam advance distance）, stirring dress can be also added in long cores always
Put to realize whole foam flooding.Comprise the following steps that：
First, by testing well test mining site actual foam flooding distance and accounting for ratio between injection-production well
Test well test actual bubble foam is laid between injection-production well and drives distance：Mining site real well is away from for L, first in actual injection-production well
Centre position L1Place, which is laid in a bite monitoring well, observation production fluid, whether there is foam, if L1Foam is not present in place, apart from L1-
A bite inspection well is laid at 10000mm, continues to observe with the presence or absence of foam in production fluid, if L1- 10000mm places are still not present
Foam, continuation will lay a bite inspection well apart from shortening successively at 10000mm, until observing in production fluid that there is foam is
Only；If L1There is foam in place, apart from L1Lay a bite inspection well in+10000mm places；Continue to observe in production fluid with the presence or absence of bubble
Foam, if L1Foam is still not present in+10000mm places, and continuation will lay a bite inspection well at often increase 10000mm, until
Observe untill foam is not present in production fluid；
It is L ' by the distance definition of actual monitoring to foam, then ratio is L '/L between foam flooding distance accounts for injection-production well.
2nd, the preparation of rock core is spliced：
Rock core is adopted as the cementing artificial core of quartz sand, and dimensions is 25 × 600mm of Φ, the permeability and hole of rock core
Degree is identical with actual reservoir situation in step one, and a portion rock core is cut into length for 450mm, 300mm, 200mm,
150mm, 100mm, 50mm, 30mm, 20 mm and the actual foam generation distance of some sections of follow-up tests of 10 mm are used.
3rd, due to the state of foam under different pressures be it is different, in order to ensure production fluid at test point form not
Become,, will by certain gas-liquid mol ratio at core entry end by pressure test core holding unit fixed test rock intracardiac pressure
CO2Constant pressure injection, the injection of foaming agent constant speed, fixation ends back pressure monitor the pressure of several test points, obtain pressure and corresponding rock
The data of heart distance.
As shown in figure 9, pressure test core holding unit includes glass rock core clamping outer barrel 13, packing element 14, packing element 14 is placed in
In glass rock core clamping outer barrel 13, some sections of rock cores, some sections of rock core formation splicing rock cores 15, simulation core are placed in packing element 14
16 are separately positioned on the two ends of splicing rock core 15, and glass rock core clamping outer barrel 13 is provided at both ends with seal joint 17, wherein one
The connection of seal joint 17 top lattice bolt regulator 26 is held, is stretched out from the other end seal joint 17 of simulation core 16, packing element 14 and glass
Annular space between glass rock core clamping outer barrel 13 is confined pressure chamber, and ring pressure load ports 18 are arranged on glass rock core clamping outer barrel 13
Back, the belly of glass rock core clamping outer barrel 13 sets several monitoring holes, and pressure monitor 44 passes through one of monitoring holes
It is inserted into packing element 14, T-shaped rigid seal plug 21 is inserted into monitoring holes；Pressure monitor 44 has a upper end open,
The pressure-resistant glass tube of lower end closed, the bottom of pressure-resistant glass tube is provided with pressure gauge 45 and monitoring valve 25；Push up lattice bolt regulator
26 have a closed cavity, and simulation core top lattice bolt 28 is fastened through cavity with simulation core 16, simulation core mozzle
27 one end are extend into closed cavity, and the other end penetrates the initiating terminal that simulation core 16 is butted on splicing rock core 15, in addition a mould
Intend rock core mozzle 27 and communicated with splicing the end of rock core 15.The effect of simulation core 16 is fixed splicing rock core 15.
CO2Foam enters splicing rock core 15, CO via exterior tubing by simulation core mozzle 272Foam can be by having
Two circulating pathways：One is to flow through pressure gauge 45 via the monitoring control of valve 25 in splicing rock core 15 to enter pressure monitor 44
In；Two are flowed directly out and are connected with exterior tubing via simulation core mozzle 27 in splicing rock core 15, import and export respectively by
Splice the Valve controlling on the simulation core mozzle 27 of the front end of rock core 15, and the simulation core by the end of splicing rock core 15
Valve controlling on mozzle 27.The ring pressure of core holding unit is controlled to enter ring pressure load ports 18 by adjusting by ring pressure valve 46
Fluid matasomatism is realized in packing element 14.Top lattice bolt regulator 26 is used cooperatively with simulation core top lattice bolt 28, makes splicing rock core
15 realize sealing with simulation core 16.Hole position on packing element 14 opens the position of eyelet according to glass core holding unit outer barrel 13
Decision is put, packing element 14 is field-replaceable unit.
4th, fixed note adopts the foam advance distance detection under pressure：
1）Prepare splicing rock core, the rock core of a section splicing is put into core holding unit, carry out the evacuation saturation of rock core
Water；
2）Rock core saturated oils, above-mentioned rock core is put into froth breaking distance test core holding unit, in centre position L2Place adds
Enter foam detecting device；
3）The device of the actual mining site carbon dioxide long range foam flooding of connection simulation carries out CO2Foam flooding is tested, in device
Foam flooding core holding unit 6 uses froth breaking distance test core holding unit；
4）Germicidal efficacy, opens monitoring valve 25, the fiber optic receiver that correlation fibre optical sensor 23 coordinates is by fluid analysis
Data are reacted in data collecting system；
5）Analyze data, centre position L2Whether place has foam, and froth breaking position is in rear somewhere if having foam, if still
Foam then froth breaking position in front somewhere；
6）According to 5）Middle analysis result simultaneously combines principle of similarity, in the rock core L corresponding with actual mining site test position2+
40mm、L2+ 80mm ... or L2-40mm、L2- 80mm ... places continue to test, and observe the state of Produced Liquid, until finding froth breaking
Apart from L3；
5th, long range foam flooding：
1）Prepare splicing rock core, rock core is put into core holding unit, carry out the evacuation saturation water of rock core；
2）Rock core saturated oils；
3）Foam flooding core holding unit is adopted in the device of the actual mining site carbon dioxide long range foam flooding of connection simulation, device
Use secondary agitation core holding unit（The number of magnetic stirring apparatus 30 is determined by specific experiment scheme）, in froth breaking apart from L3Place at place
Magnetic stirring apparatus 30, regulation rock core pressue device causes rock core pressure to be the reset pressure P, L at rock core froth breaking3At+40 mm and
A foam detecting device is placed respectively in rock core end；
4）Start Germicidal efficacy, foaming agent continues to foam by the stirring of magnetic stirring apparatus 30；Open L3Detected at+40 mm
Valve 29, is then shut off L3Detect that valve 29 opens rock core end point detection valve 29 at+40 mm, displacing fluid outflow is passed through correlation light
Fluid analysis data are reacted in data collecting system by the fiber optic receiver that fiber sensor 23 coordinates；
5）Analyze data, L3Whether at+40 mm and rock core end has foam；If L3There is bubble at+40 mm and rock core end
Foam, then secondary agitation can stop experiment；If L3At+40 mm non-foam then froth breaking position in front somewhere；If L3At+40 mm
There is foam rock core end non-foam, then froth breaking position is in L3At+40 mm between rock core end；
6）According to 4）Middle analysis result is in L3+80 mm、L3+ 120 mm ... places continue to test, and observe the state of Produced Liquid,
Until finding froth breaking apart from L4, now the pressure of froth breaking position is P1；
7）Analysis result：If 1. L3+ L4=400 mm, then secondary agitation is that simulation field test 2/3 can be achieved to steep over long distances
Foam drives；If 2. L3+ L4The mm of ＞ 400, experiment continues, and reduces L3Locate the rotating speed of magnetic stirring apparatus 30, now L3Corresponding to froth breaking distance is
L5, wherein L3+ L5=400 mm；If 3. L3+L4The mm of ＜ 400, experiment continues, in froth breaking distance（L3+ L4）Place magnetic force and stir in place
Device 30 is mixed, regulation rock core pressue device causes rock core pressure to be P1Triple mixing is carried out, determines froth breaking apart from L6If, L3+ L4+L6=
400 mm, then stop experiment, if L3+ L4+L6The mm of ＞ 400, experimentation is with 2., if L3+ L4+ L6The mm of ＜ 400, then test
Process repeats to continue, until finding L3+ L4+ ...=400 mm, experiment terminates.
Above-mentioned 5th step of the present invention could alternatively be complete foam flooding, and its process is：
1）Prepare splicing rock core, rock core is put into core holding unit, carry out the evacuation saturation water of rock core；
2）Rock core saturated oils；
3）Experimental provision is connected, and experimental provision is using many wheel stirring core holding units（That is secondary agitation core holding unit, its
The number of middle magnetic stirring apparatus 30 is determined by specific experiment scheme）, in froth breaking apart from L3Magnetic stirring apparatus 30 is placed at place, adjusts rock
Heart pressue device causes rock core pressure to be P, and experiment determines froth breaking apart from L4；
4）Continue to test,（L3+ L4）Place plus magnetic stirring apparatus 30, regulation rock core pressue device make it that rock core pressure is
P1, experiment determines froth breaking apart from L ', if L3+ L4+ L ' >=600, then stop experiment；If L3+ L4+ L '≤600, experiment continues,
In froth breaking distance（L3+ L4+ L’）Place, which is placed, carries magnetic stirring apparatus 30, and regulation rock core pressue device causes rock core pressure to be rock
Pressure at heart froth breaking is stirred, until L3+ L4+ L '+... >=600, experiment terminates.
As shown in figure 1, the device of this actual mining site carbon dioxide long range foam flooding of simulation includes insulating box 1, constant temperature
Foaming agent piston container 2, CO are provided with case 12Storage tank 3, foaming core holding unit 4, foam flooding core holding unit 6, liquid
Metering device 8, gas-metering device 9, foaming agent piston container 2, CO2The entrance of storage tank 3 respectively with the core holding unit 4 that foams
End is connected, and the port of export for the core holding unit 4 that foams is by six logical 5 connection foam flooding core holding units 6, and six lead to installation pressure on 5
Power table 45, the connection gas-liquid separator 7 of foam flooding core holding unit 6, it is gentle that gas-liquid separator 7 connects liquid metering device 8 respectively
Body metering device 9, final production fluid influent metering device 8, gaseous product enters gas-metering device 9；Foam flooding rock core
The port of export of clamper 6 is provided with back-pressure valve 10, and back-pressure valve 10 can control rock core port of export back pressure, and effect is in certain pressure
Under, prevent output object from flowing back；Foaming agent piston container 2, CO2Storage tank 3 connects corresponding constant pressure constant speed pump 11, constant pressure and constant respectively
The effect of fast pump 11 is by blowing agent system solution and CO2Gas presses gas-liquid mol ratio 1:1 drives into core holding unit.The present invention enters
The fixed note of row adopts the detection of foam advance distance and long range foam flooding or complete foam flooding laboratory experiment under pressure.
Foam flooding core holding unit 6 is froth breaking distance test core holding unit or secondary agitation core holding unit, because real
Border rock core is not visible, in order to by froth breaking distance test core holding unit, using the method for fixed point detection outflow liquid status, test
Actual foam advance distance；Secondary agitation core holding unit realizes foam flooding distance controlling, experimental rank when being tested
Section selection is used.
As shown in Fig. 2 froth breaking distance test core holding unit includes glass rock core clamping outer barrel 13, packing element 14, packing element 14
It is placed in glass rock core clamping outer barrel 13, glass rock core clamping outer barrel 13 is arranged on clamper base 12, is placed in packing element 14
Some sections of rock cores, some sections of rock core formation splicing rock cores 15, simulation core 16 is separately positioned on the two ends of splicing rock core 15, simulation
The effect of rock core 16 is fixed rock core；Glass rock core clamping outer barrel 13 is provided at both ends with seal joint 17, wherein one end sealing pressure
The connection of ring 17 top lattice bolt regulator 26, stretches out, packing element 14 is pressed from both sides with glass rock core from the other end seal joint 17 of simulation core 16
It is confined pressure chamber to hold the annular space between outer barrel 13, and ring pressure load ports 18 are arranged on the back that glass rock core clamps outer barrel 13, ring
Press and fixed outer shroud 19 is set at load ports 18, the effect of fixed outer shroud 19 is to fix ring pressure load ports 18.Glass rock core is clamped
The belly of outer barrel 13 sets several monitoring holes, and output liquid mozzle 20 is inserted into packing element 14 by one of monitoring holes,
The position that the hole position of packing element 14 opens eyelet according to glass core holding unit outer barrel 13 determines that packing element 14 is exchangeable portion
Part.T-shaped rigid seal plug 21 is inserted into remaining monitoring holes, and the lower end of output liquid mozzle 20 is inserted into fluid collector 22
In, correlation fibre optical sensor 23 is installed, back-pressure valve 10 is arranged on correlation fibre optical sensor 23 on output liquid mozzle 20
Below, installation data acquisition system in the connection of correlation fibre optical sensor 23 computer 24, computer 24, monitoring valve 25 is arranged on
Export on liquid mozzle 20, positioned at the top of correlation fibre optical sensor 23, output liquid mozzle 20, correlation fibre optical sensor
23rd, back-pressure valve 10, monitoring valve 25 constitute pressure monitoring device, and pressure monitoring device effect is can to monitor fluid to flow through the test
The pressure of point.Pushing up lattice bolt regulator 26 has a closed cavity, and simulation core top lattice bolt 28 is through cavity with simulating rock
The heart 16 is fastened, and the one end of simulation core mozzle 27 is extend into closed cavity, and the other end penetrates simulation core 16 and is butted on splicing rock
The initiating terminal of the heart 15, in addition a simulation core mozzle 27 with splice rock core 15 end communicate.
T-shaped rigid seal plug 21 is non-conductive high pressure resistant material, can both play sealing function, can reduce ring pressure again
The influence brought for core test point pressure, prevents tapping gas leakage pressure release.The effect of seal joint 17 is fastening glass rock core
Clamper outer barrel 13, realizes core holding unit and strengthens sealing.
The back-pressure valve 10 set at correlation fibre optical sensor 23 can control rock core port of export back pressure, and effect is that control should
Point pressure is identical with pressure at rock core, output object is not changed.
CO2Foam enters splicing rock core 15 via exterior tubing by simulation core mozzle 27, in splicing rock core 15
Controlled to flow through correlation fibre optical sensor 23 into fluid collector 22 via the output water conservancy diversion of liquid mozzle 20 by monitoring valve 25；Stream
Body flows through correlation fibre optical sensor 23 observes wherein whether contain foam via the analysis fluid of computer 24.
As shown in figure 3, secondary agitation core holding unit includes glass rock core clamping outer barrel 13, packing element 14, packing element 14 is placed in
In glass rock core clamping outer barrel 13, some sections of rock cores, some sections of rock core formation splicing rock cores 15, simulation core are placed in packing element 14
16 are separately positioned on the two ends of splicing rock core 15, and glass rock core clamping outer barrel 13 is provided at both ends with seal joint 17, wherein one
The connection of seal joint 17 top lattice bolt regulator 26 is held, is stretched out from the other end seal joint 17 of simulation core 16, packing element 14 and glass
Annular space between glass rock core clamping outer barrel 13 is confined pressure chamber, and ring pressure load ports 18 are arranged on glass rock core clamping outer barrel 13
The back at top, the belly of glass rock core clamping outer barrel 13 sets several monitoring holes, and output liquid mozzle 20 passes through wherein two
Individual monitoring holes are inserted into packing element 14, and T-shaped rigid seal plug 21 is inserted into remaining monitoring holes, under output liquid mozzle 20
End is inserted into fluid collector 22, is provided with correlation fibre optical sensor 23 on output liquid mozzle 20, back-pressure valve 10 is installed
Below correlation fibre optical sensor 23, correlation fibre optical sensor 23 connects installation data in computer 24, computer 24 and adopted
Collecting system.Detect that valve 29 is arranged on output liquid mozzle 20, positioned at the top of correlation fibre optical sensor 23, export liquid mozzle
20th, correlation fibre optical sensor 23, back-pressure valve 10, detection valve 29 constitute and two are provided with foam detecting device, present embodiment
Individual foam detecting device.
Pushing up lattice bolt regulator 26 has a closed cavity, and simulation core top lattice bolt 28 passes through cavity and simulation core
16 fastenings, one end of simulation core mozzle 27 is extend into closed cavity, and the other end penetrates simulation core 16 and is butted on splicing rock core
15 initiating terminal, in addition a simulation core mozzle 27 with splice rock core 15 end communicate；Splice in rock core 15 certain two
Waist drum shape magnetic stirring apparatus 30 is provided between rock core, forcing pipe 31 is arranged on the top of waist drum shape magnetic stirring apparatus, forcing pipe 31
It extend into packing element 14, pressurization table 32 and pressurizing valve 33 is set on forcing pipe 31；Forcing pipe 31 and CO2Storage tank 3 is connected, and leads to
Overregulate pressurizing valve 33, observation back pressure meter make it that after stirring that foam may be advanced into froth breaking position, forcing pipe 31, back pressure meter plus
Pressure valve 33 constitutes pressue device.The pressure of back pressure meter is tried to achieve according to principle of similarity by following pressure test.
The lower section of waist drum shape magnetic stirring apparatus sets bottom magnetic drive unit, as shown in Fig. 6, Fig. 7, Fig. 8, magnetic stirring apparatus
30 include waist drum shape hollow casing, and waist drum shape hollow casing is arranged in lucite cylinder 47, the outer wall cloth of waist drum shape hollow casing
Full conical tooth, waist drum shape hollow casing bottom sets cylinder-shaped magnet 34, and the half of cylinder-shaped magnet 34 is N poles, and half is S
Pole, N poles and S poles are set along substantially symmetrical about its central axis, and lower roller ball 35 is set below cylinder-shaped magnet 34, waist drum shape hollow casing
Top sets upper roller ball 36, and upper roller ball 36 is engaged with the top shape of lucite cylinder 47, and can be relative to organic glass
Glass cylinder 47 is freely rotated, and lower roller ball 35 is engaged with the bottom shape of lucite cylinder 47, also can be relative to lucite cylinder
47 freely rotate, and lucite cylinder 47 is the cylinder that left and right ends are opened, and the length of lucite cylinder 47 is slightly longer than waist drum shape sky
When adding waist drum shape magnetic stirring apparatus 30 in the length of heart shell, splicing rock core 15, by the left and right ends of lucite cylinder 47 point
It is not connected with corresponding splicing rock core 15, lucite cylinder 47 now plays occupy-place protective effect again, is waist drum shape hollow casing
Revolution space is provided.General bubble radius are more than 10-10Mm, gap is 1 ~ 2mm, and the range of speeds is 5~500 revs/min.
As shown in Figure 4, Figure 5, bottom magnetic drive unit include motor 37, azimuth axis 38, rotary shaft 39, insulation gear 40,
Magnetic-gear 41, motor 37 is fixed on base platform 43 by electric machine support 42, and azimuth axis 38 is secured within using on motor 37
In conveying power, azimuth axis 38 connects rotary shaft 39, the other end connection insulation gear 40 of rotary shaft 39, insulation by conveyer belt
Gear 40 is engaged with magnetic-gear 41, and insulation gear 40 is fixed on base platform 43 by rotary shaft 39 respectively with magnetic-gear 41
Projection on.Motor 37 drives azimuth axis 38 to rotate, and insulation gear 40 is driven via conveyer belt, and insulation gear 40 drives magnetic force tooth
Wheel 41, magnetic-gear 41 drives lower roller ball 35 to roll with cylinder-shaped magnet 34 by magneticaction, while waist drum shape agitator
Shell is rolled with upper roller ball 36.
Rock core is adopted as the cementing artificial core of quartz sand in the present invention, and dimensions is 25 × 600mm of Φ, the infiltration of rock core
Rate is identical with the actual mining site actual reservoir situation to be tested with porosity, and a portion rock core is cut into length and is
450mm, 300mm, 200mm, 150mm, 100mm, 50mm, 30mm, 20 mm and some sections of 10 mm, test actual foam life
Used into distance.
The present invention is mainly the sliceable core experiment of section shape, constant pressure injection CO2Gas, while constant speed injects foaming agent
Solution.The existence of foam in rock core is observed using monitoring system, the froth breaking position L of foam is determined1, then using new rock core
Along actual long cores in froth breaking position L1Place sets agitating device, it is ensured that the secondary propulsion of bubble is stirred into, it is then determined that secondary bubble
The froth breaking position L of foam2, foam actual forward distance is promoted using same procedure successively until meeting simulation proportion requirement（Wherein
The rotating speed of agitating device can be adjusted according to required foam advance distance）, stirring dress can be also added in long cores always
Put to realize whole foam flooding.
It is as follows that the present invention carries out field experiment：
Mining site and laboratory experiment introduction：
Mining site actual conditions：Rock core used is that, using Jilin Oil Field oil recovery factory block as reference, the block is typical case
Nonhomogeneous multiple oil-layer low permeability sandstone reservoir, the area be high temperature（97.3℃）With high pressure block.Formation pressure is averaged
23.11MPa, the MPa of inlet port pressure 32, back pressure is 8MPa.The average perm-plug method 10 × 10 of reservoir-3µm2, porosity
14.5%, formation water salinity is 11737.7mg/L.From cloudy non-amphoteric foaming agent A foaming agents, gas-liquid mol ratio is 1:1,
CO2Constant pressure injection, the injection of foaming agent constant speed.
Laboratory experiment parameter is selected and scheme explanation：
Laboratory experiment parameter：The cementing artificial core of quartz sand, dimensions is 25 × 600mm of Φ.97.3 DEG C of experimental temperature,
The MPa of inlet port pressure 32, back pressure is 8MPa.The average perm-plug method 10 × 10 of rock core-3µm2, porosity 14.5%, from cloudy non-
Amphoteric foaming agent A foaming agents, gas-liquid mol ratio is 1:1, CO2Constant pressure injection, the injection of foaming agent constant speed.Constant pressure constant speed pump 11,
Intermediate receptacle, natural core, foam flooding core holding unit 6, foam detector, liquid meter, gasometer etc. is according to Fig. 1
Connection.
First, by testing well test mining site actual foam flooding distance and accounting for ratio between injection-production well
Test well test actual bubble foam is laid between injection-production well and drives distance：Mining site real well exists first away from for 150000mm
Laid at 600000mm in a bite well, observation production fluid and there is foam, a bite inspection well is being laid at 800000mm；Continue
Observation production fluid still suffers from foam, and a bite inspection well is being laid at 100000mm；Continue to observe production fluid in the absence of foam,
Now distance is the actual foam flooding of mining site apart from 100000mm to record, and it is 2/3 that foam flooding distance, which accounts for ratio between injection-production well,.
Laboratory experiment foam flooding experimental designs are as follows：
The laboratory experiment foam flooding experimental program of table 1
2nd, experiment rock core makes
Using similarity criterion, proportional sizes between injection-production well are accounted for according to foam flooding distance, the foam for realizing simulation ratio is made
Drive rock core.A collection of quartz sand plastic bonding artificial core is made, dimensions is 25 × 600mm of Φ.Average perm-plug method
10×10-3µm2, porosity 14.5%.A portion rock core is cut into length for 450mm, 300mm, 200mm, 150mm,
100mm, 50mm, 30mm, 20 mm and the actual foam generation distance of some sections of follow-up tests of 10 mm are used.
3rd, special froth breaking distance test core holding unit test foam advance distance
1st, pressure test core holding unit makes, such as Fig. 9.
2nd, special froth breaking distance test core holding unit makes, such as Fig. 2.
3rd, pressure test
1. prepare rock core, 600mm rock cores are put into core holding unit, carry out the evacuation saturation water of rock core, vacuumize 2h；
2. saturation crude oil, foam detecting device is added at splicing each measuring point of long cores；
3. experimental provision is connected；
4. Germicidal efficacy is started, record flows through the monitoring pressure at each monitoring point, pressure and corresponding rock core distance relation
Figure such as Figure 10；
Pressure irregularly reduces between actual injection-production well, in order to ensure at the accuracy of real data, each monitoring point
It is actually measured that pressure still needs to pressure monitoring device.As a result it is as follows：
Pressure data at the monitoring point of table 2
| Monitoring point distance (mm) | Monitor pressure (MPa) |
| 0 | 32 |
| 50 | 30 |
| 100 | 26.5 |
| 150 | 23 |
| 200 | 20 |
| 250 | 16 |
| 300 | 13.5 |
| 320 | 13 |
| 340 | 12.5 |
| 360 | 12.2 |
| 380 | 12 |
| 400 | 11.7 |
| 420 | 11.4 |
| 440 | 10.9 |
| 460 | 10.4 |
| 480 | 9.8 |
| 500 | 9.2 |
| 520 | 8.9 |
| 540 | 8.5 |
| 560 | 8.3 |
| 580 | 8.2 |
| 600 | 8 |
4th, secondary agitation core holding unit realizes foam flooding distance controlling.
Secondary agitation core holding unit makes, such as Fig. 3.
5th, experimental provision connection and long range foam flooding or the experiment of complete foam flooding：
1st, fixed note adopts the foam advance distance detection under pressure
1. 600mm splicing long cores are prepared, rock core evacuates saturation water and cured；
2. rock core saturated oils, rock core is put into special froth breaking distance test core holding unit, in splicing long cores 300mm
Place adds foam detecting device；
1. connection experimental provision carries out CO2Foam flooding is tested, and injection pressure is 32MPa；
4. Germicidal efficacy, opens monitoring valve 25, and the fiber optic receiver that correlation fibre optical sensor 23 coordinates is by fluid analysis
Data are reacted in data collecting system；
5. whether there is foam at analyze data, 300mm.Froth breaking position is in rear somewhere if having foam, if non-foam
Froth breaking position is in front somewhere；
6. experiment is continued at 260mm, 220mm according to 5. middle analysis result, observes the state of Produced Liquid；
As a result it is as follows：
Table 3 stirs test position correspondence foam state table for the first time
| Test position（mm） | With the presence or absence of foam |
| 300 | It is no |
| 260 | It is no |
| 220 | It is |
There is foam at equal non-foam, 220mm at 260-300mm in the result of table 3, then first froth breaking distance is arrived in 220mm
Between 260mm.
7. add at position 240mm, 250mm between 220mm to 260mm and survey foam state, find 240mm, 250mm
There is foam at place, then first froth breaking distance is between 250mm to 260mm, and it is 250mm to determine froth breaking distance, and pressure is herein
16MPa。
2nd, long range foam flooding or the experiment of complete foam flooding
Experiment continues to test the corresponding froth breaking distance of different rotating speeds under 16MPa（Table 4）With the froth breaking under different injection pressure
Distance（Table 5）.Final draft can realize the simulation foam flooding scheme of field test 2/3（Figure 11）With the pressure side of complete foam flooding
Case（Figure 12）.
The corresponding froth breaking distance of different rotating speeds under the 16MPa of table 4
| Mixing speed（r/min） | Foam advance distance (mm) |
| 500 | 170 |
| 400 | 150 |
| 300 | 120 |
| 200 | 70 |
| 100 | 10 |
Froth breaking distance under the 500r/min speed of table 5 under different injection pressure
| Inject pressure（MPa） | Produce end pressure（MPa） | Foam advance distance (mm) |
| 32 | 8 | 250 |
| 30 | 8 | 229 |
| 28 | 8 | 209 |
| 27 | 8 | 199 |
| 26 | 8 | 190 |
| 25 | 8 | 182 |
| 24 | 8 | 175 |
| 23 | 8 | 169 |
| 22 | 8 | 164 |
| 21 | 8 | 160 |
| 20 | 8 | 157 |
| 19 | 8 | 154.5 |
| 18 | 8 | 152.5 |
| 17 | 8 | 151 |
| 16 | 8 | 150 |
| 15 | 8 | 138 |
| 14 | 8 | 128 |
| 13 | 8 | 119 |
| 12 | 8 | 112 |
| 11 | 8 | 107 |
| 10 | 8 | 100 |
| 9 | 8 | 70 |
| 8.7 | 8 | 60 |
| 8.3 | 8 | 45 |
Analyze above-mentioned pressure regime, it is known that laboratory experiment realizes that simulation field test 2/3 foam flooding needs to add at 250mm
Enter a magnetic stirring apparatus, to realize that complete foam flooding needs to add four altogether at 250mm, 400mm, 500mm, 560mm
Magnetic stirring apparatus.
1）Simulate the experiment of the foam flooding of field test 2/3
1. prepare rock core, 600mm splicing rock cores are put into core holding unit, the evacuation saturation water of rock core is carried out, take out true
Empty 2h；
2. saturation crude oil；
3. experimental provision is connected, and experimental provision uses secondary agitation core holding unit, and band is placed at 250mm in rock core
There is the lucite cylinder 47 of magnetic stirring apparatus 30（Rotating speed is 400r/min）, adjust rock core pressue device and cause foam pressure after stirring
Power is 16MPa, and a foam detecting device is placed respectively with rock core end at 290mm；
4. Germicidal efficacy is started, foaming agent continues to foam by the stirring of magnetic stirring apparatus 30.Detection valve at 290 mm is opened,
It is then shut off detecting that valve 29 opens rock core end point detection valve 29 at 290 mm, displacing fluid outflow is passed through correlation fibre optical sensor
Fluid analysis data are reacted in data collecting system by 23 fiber optic receivers coordinated.
5. at analyze data, 290mm and whether rock core end has foam.If there is foam at 290mm and rock core end,
Secondary agitation can stop experiment；Froth breaking position is in front somewhere if non-foam at 290mm；If there is foam rock core at 290mm
End non-foam, then froth breaking position at 290mm between rock core end；
6. experiment continues, and repeats at above-mentioned secondary agitation foam step, 330mm, 370mm, 410mm and rock core end difference
A foam detecting device is placed, finds secondary froth breaking between 370mm to 410mm；
As a result it is as follows：
The secondary agitation test position of table 6 correspondence foam state table
| Test position（mm） | Inspection positions whether there is foam | Rock core end whether there is foam |
| 290 | It is | It is no |
| 330 | It is | It is no |
| 370 | It is | It is no |
| 410 | It is no | It is no |
There are foam, and rock core end non-foam in the result of table 6 at 330-370mm, then secondary froth breaking distance is arrived in 370mm
Between 410mm.
7. add between 370mm to 410mm at the 400mm of position and survey foam state, find there is foam at 400mm, then
Secondary froth breaking distance is between 400mm to 410mm, and it is 400mm to determine froth breaking distance.
The total advance distance of this scheme foam is 400mm, accounts for the 2/3 of total rock core length 600mm, and scene 2/3 can be achieved and steeps
The simulation that foam drives.
2）Complete foam flooding experiment
1. prepare rock core, 600mm splicing rock cores are put into core holding unit, the evacuation saturation water of rock core is carried out, take out true
Empty 2h；
2. saturation crude oil；
3. experimental provision is connected, and experimental provision uses secondary agitation core holding unit（250mm, 400mm, 500mm,
Four magnetic stirring apparatuses are added at 560mm altogether, rotating speed is 500r/min）, adjust rock core pressue device and cause four after stirring
Foam pressure at individual position is respectively 16 MPa, 10MPa, 8.7 MPa and 8.3MPa, places a bubble respectively in rock core end
Foam detection means；
4. Germicidal efficacy is started, foaming agent continues to foam by the stirring of magnetic stirring apparatus 30.Detection valve 29 is opened, makes displacement
Fluid analysis data are reacted to data collecting system by the fiber optic receiver that liquid outflow coordinates by correlation fibre optical sensor 23
In.
5. five froth breaking distance tests
There is foam in analyze data, rock core end, then complete foam flooding experiment can be achieved in five stirrings.
The total advance distance of this scheme foam is 600mm, and with total rock core equal length, scene foam flooding completely can be achieved
Simulation.
6th, this field experiment is proved, the present invention can be in CO2Many wheel stirrings are realized during foam flooding laboratory experiment again
Secondary generation foam, realizes the analog simulation of laboratory experiment and field test.Device therein can be realized effectively to foam system
The monitoring of form, determines the froth breaking position of foam, through excessive wheel stirring again generation foam realize apart from upper ratio foam flooding or
Complete foam flooding.Accurate Displacement Efficiency is provided for less permeable layer according to the experiment conclusion drawn, is conducive to CO2Foam
The further research of displacement of reservoir oil laboratory experiment, can improve recovery ratio for field test and provide further technical support.
Claims (8)
1. a kind of method for simulating actual mining site carbon dioxide long range foam flooding, it is characterised in that：This actual mining site of simulation
The method of carbon dioxide long range foam flooding comprises the following steps：
First, by testing well test mining site actual foam flooding distance and accounting for ratio between injection-production well
Test well test actual bubble foam is laid between injection-production well and drives distance：Mining site real well is away from for L, first in the middle of actual injection-production well
Position L1Place, which is laid in a bite monitoring well, observation production fluid, whether there is foam, if L1Foam is not present in place, apart from L1-
A bite inspection well is laid at 10000mm, continues to observe with the presence or absence of foam in production fluid, if L1- 10000mm places are still not present
Foam, continuation will lay a bite inspection well apart from shortening successively at 10000mm, until observing in production fluid that there is foam is
Only；If L1There is foam in place, apart from L1Lay a bite inspection well in+10000mm places；Continue to observe in production fluid with the presence or absence of bubble
Foam, if L1Foam is still not present in+10000mm places, and continuation will lay a bite inspection well at often increase 10000mm, until
Observe untill foam is not present in production fluid；
It is L ' by the distance definition of actual monitoring to foam, then ratio is L '/L between foam flooding distance accounts for injection-production well；
2nd, the preparation of rock core is spliced
Rock core is adopted as the cementing artificial core of quartz sand, and dimensions is 25 × 600mm of Φ, the permeability of rock core and porosity with
Actual reservoir situation is identical in step one, and a portion rock core is cut into length for 450mm, 300mm, 200mm,
150mm, 100mm, 50mm, 30mm, 20 mm and the actual foam generation distance of some sections of follow-up tests of 10 mm are used；
3rd, by pressure test core holding unit fixed test rock intracardiac pressure, at core entry end, by certain gas-liquid mol ratio
By CO2Constant pressure injection, the injection of foaming agent constant speed, fixation ends back pressure monitor the pressure of several test points, obtain pressure and corresponding
The data of rock core distance；
4th, fixed note adopts the foam advance distance detection under pressure：
1）Prepare splicing rock core, the rock core of a section splicing is put into core holding unit, carry out the evacuation saturation water of rock core；
2）Rock core saturated oils, above-mentioned rock core is put into froth breaking distance test core holding unit, in centre position L2Place adds foam
Detection means；
3）The device of the actual mining site carbon dioxide long range foam flooding of connection simulation carries out CO2Foam flooding is tested, foam flooding in device
Core holding unit（6）Using froth breaking distance test core holding unit；
4）Germicidal efficacy, opens monitoring valve（25）, correlation fibre optical sensor（23）The fiber optic receiver of cooperation is by fluid analysis
Data transfer is in data collecting system；
5）Analyze data, centre position L2Whether place has foam, and froth breaking position is in rear somewhere if having foam, if non-foam
Froth breaking position is in front somewhere；
6）According to 5）Middle analysis result simultaneously combines principle of similarity, in the rock core L corresponding with actual mining site test position2+40mm、
L2+ 80mm ... or L2-40mm、L2- 80mm ... places continue to test, and observe the state of Produced Liquid, until finding froth breaking distance
L3；
5th, long range foam flooding：
1）Prepare splicing rock core, rock core is put into core holding unit, carry out the evacuation saturation water of rock core；
2）Rock core saturated oils；
3）Foam flooding core holding unit in the device of the actual mining site carbon dioxide long range foam flooding of connection simulation, device（）Using
Secondary agitation core holding unit, in froth breaking apart from L3Place magnetic stirring apparatus in place（30）, adjust rock core pressue device and cause rock core
Pressure is the reset pressure P, L at rock core froth breaking3A foam detecting device is placed respectively at+40 mm and rock core end；
4）Start Germicidal efficacy, foaming agent passes through magnetic stirring apparatus（30）Stirring continues to foam；Open L3Valve is detected at+40 mm
（29）, it is then shut off L3Valve is detected at+40 mm（29）Open rock core end point detection valve（29）, make displacing fluid outflow by penetrating
Formula fibre optical sensor（23）Fluid analysis data are reacted in data collecting system by the fiber optic receiver of cooperation；
5）Analyze data, L3Whether at+40 mm and rock core end has foam；If L3There is foam at+40 mm and rock core end,
Then secondary agitation can stop experiment；If L3At+40 mm non-foam then froth breaking position in front somewhere；If L3There is bubble at+40 mm
Foam rock core end non-foam, then froth breaking position is in L3At+40 mm between rock core end；
6）According to 4）Middle analysis result is in L3+80 mm、L3+ 120 mm ... places continue to test, and observe the state of Produced Liquid, until
Froth breaking is found apart from L4, now the pressure of froth breaking position is P1；
7）Analysis result：If 1. L3+L4=400 mm, then secondary agitation is that the simulation long range foam flooding of field test 2/3 can be achieved；
If 2. L3+L4The mm of ＞ 400, experiment continues, and reduces L3Locate magnetic stirring apparatus（30）Rotating speed, now L3Correspondence froth breaking distance is L5, its
Middle L3+ L5=400 mm；If 3. L3+L4The mm of ＜ 400, experiment continues, in froth breaking distance（L3+L4）Place magnetic stirring apparatus in place
（30）, adjust rock core pressue device and cause rock core pressure to be P1Triple mixing is carried out, determines froth breaking apart from L6If, L3+L4+L6=400
Mm, then stop experiment, if L3+L4+L6The mm of ＞ 400, experimentation is with 2., if L3+L4+L6The mm of ＜ 400, then experimentation repetition
Continue, until finding L3+L4+ ...=400 mm, experiment terminates.
2. the method for the actual mining site carbon dioxide long range foam flooding of simulation according to claim 1, it is characterised in that：Institute
The pressure test core holding unit stated includes glass rock core and clamps outer barrel（13）, packing element（14）, packing element（14）It is placed in glass rock core
Clamp outer barrel（13）It is interior, packing element（1）Some sections of rock cores of interior placement, some sections of rock core formation splicing rock cores（15）, simulation core
（16）It is separately positioned on splicing rock core（15）Two ends, glass rock core clamping outer barrel（13）Be provided at both ends with seal joint
（17）, wherein one end seal joint（17）Connection top lattice bolt regulator（26）, simulation core（16）From other end seal joint
（17）Stretch out, packing element（14）Outer barrel is clamped with glass rock core（13）Between annular space be confined pressure chamber, ring pressure load ports（18）
It is arranged on glass rock core clamping outer barrel（13）Back, glass rock core clamping outer barrel（13）Belly several monitoring holes are set,
Pressure monitor（44）Packing element is inserted into by one of monitoring holes（14）In, T-shaped rigid seal plug（21）It is inserted into prison
In gaging hole；Pressure monitoring device has a upper end open, and the pressure-resistant glass tube of lower end closed, the bottom of pressure-resistant glass tube is set
There is pressure gauge（45）With monitoring valve（25）；Push up lattice bolt regulator（26）With a closed cavity, simulation core top lattice bolt
（28）Through cavity and simulation core（16）Fastening, simulation core mozzle（27）One end is extend into closed cavity, the other end
Penetrate simulation core（16）It is butted on splicing rock core（15）Initiating terminal, a simulation core mozzle in addition（27）With splicing rock core
（15）End communicate.
3. the method for the actual mining site carbon dioxide long range foam flooding of simulation according to claim 2, it is characterised in that：Institute
The device for the actual mining site carbon dioxide long range foam flooding of simulation stated includes insulating box（1）, insulating box（1）Inside it is provided with foaming
Agent piston container（2）、CO2Storage tank（3）, foaming core holding unit（4）, foam flooding core holding unit（6）, liquid metering device
（8）, gas-metering device（9）, foaming agent piston container（2）、CO2Storage tank（3）Respectively with foaming core holding unit（4）Enter
Mouth end is connected, and foam core holding unit（4）The port of export it is logical by six（5）Connect foam flooding core holding unit（6）, six lead to
（5）Upper installation pressure gauge（45）, foam flooding core holding unit（6）Connect gas-liquid separator（7）, gas-liquid separator（7）Connect respectively
Connect liquid metering device（8）And gas-metering device（9）, foaming agent piston container（2）、CO2Storage tank（3）Connect respectively corresponding
Constant pressure constant speed pump（11）；Foam flooding core holding unit（6）It is that froth breaking distance test core holding unit or secondary agitation rock core are pressed from both sides
Holder.
4. the method for the actual mining site carbon dioxide long range foam flooding of simulation according to claim 2, it is characterised in that：Institute
The froth breaking distance test core holding unit stated includes glass rock core and clamps outer barrel（13）, packing element（14）, packing element（14）It is placed in glass
Rock core clamps outer barrel（13）It is interior, packing element（14）Some sections of rock cores of interior placement, some sections of rock core formation splicing rock cores（15）, simulate rock
The heart（16）It is separately positioned on splicing rock core（15）Two ends, glass rock core clamping outer barrel（13）Be provided at both ends with seal joint
（17）, wherein one end seal joint（17）Connection top lattice bolt regulator（26）, simulation core（16）The other end is from seal joint
（17）Stretch out, packing element（14）Outer barrel is clamped with glass rock core（13）Between annular space be confined pressure chamber, ring pressure load ports（18）
It is arranged on glass rock core clamping outer barrel（13）Back, glass rock core clamping outer barrel（13）Belly several monitoring holes are set,
Export liquid mozzle（20）Packing element is inserted into by one of monitoring holes（14）In, T-shaped rigid seal plug（21）It is inserted into
In remaining monitoring holes, liquid mozzle is exported（20）Lower end is inserted into fluid collector（22）In, export liquid mozzle（20）On
Correlation fibre optical sensor is installed（23）, back-pressure valve（10）Installed in correlation fibre optical sensor（23）Below, correlation light
Fiber sensor（23）Connect computer（24）, computer（24）Interior installation data acquisition system；Push up lattice bolt regulator（26）Tool
There are a closed cavity, simulation core top lattice bolt（28）Through cavity and simulation core（16）Fastening, simulation core mozzle
（27）One end is extend into closed cavity, and the other end penetrates simulation core（16）It is butted on splicing rock core（15）Initiating terminal, in addition
A piece simulation core mozzle（16）With splicing rock core（15）End communicate.
5. the method for the actual mining site carbon dioxide long range foam flooding of simulation according to claim 3 or 4, its feature exists
In：Described secondary agitation core holding unit includes glass rock core and clamps outer barrel（13）, packing element（14）, packing element（14）It is placed in glass
Rock core clamps outer barrel（13）It is interior, packing element（14）Some sections of rock cores of interior placement, some sections of rock core formation splicing rock cores（15）, simulate rock
The heart（16）It is separately positioned on splicing rock core（15）Two ends, glass rock core clamping outer barrel（13）Be provided at both ends with seal joint
（17）, wherein one end seal joint（17）Connection top lattice bolt regulator（26）, simulation core（16）The other end is from seal joint
（17）Stretch out, packing element（14）Outer barrel is clamped with glass rock core（13）Between annular space be confined pressure chamber, ring pressure load ports（18）
It is arranged on glass rock core clamping outer barrel（13）The back of initiating terminal, glass rock core clamping outer barrel（13）Belly set several to supervise
Gaging hole, exports liquid mozzle（20）Packing element is inserted into by two of which monitoring holes（14）In, T-shaped rigid seal plug（21）Insert
Enter into remaining monitoring holes, export liquid mozzle（20）Lower end is inserted into fluid collector（22）In, export liquid mozzle
（20）On correlation fibre optical sensor is installed（23）, back-pressure valve（10）Installed in correlation fibre optical sensor（23）Below, it is right
Penetrate formula fibre optical sensor（23）Connect computer（24）, computer（24）Interior installation data acquisition system；Push up lattice bolt regulator
（26）With a closed cavity, simulation core top lattice bolt（28）Through cavity and simulation core（16）Fastening, simulation core
Mozzle（27）One end is extend into closed cavity, and the other end penetrates simulation core（16）It is butted on splicing rock core（15）Starting
Hold, in addition a simulation core mozzle（27）With splicing rock core（15）End communicate；Splice rock core（15）In certain two rock
Waist drum shape magnetic stirring apparatus is provided with the heart（30）, forcing pipe（31）It is arranged on waist drum shape magnetic stirring apparatus（30）Top, plus
Pressure pipe（31）It extend into packing element（14）It is interior, forcing pipe（31）It is upper that pressurization table is set（32）And pressurizing valve（33）；Waist drum shape magnetic force is stirred
Mix device（30）Lower section set bottom magnetic drive unit, magnetic stirring apparatus（30）Including waist drum shape hollow casing, waist drum shape is hollow
Shell is arranged on lucite cylinder（47）Interior, waist drum shape hollow casing outer wall is covered with conical tooth, and waist drum shape hollow casing bottom is set
Put cylinder-shaped magnet（34）, cylinder-shaped magnet（34）Half be N poles, half be S poles, N poles and S poles are set along substantially symmetrical about its central axis
Put, cylinder-shaped magnet（34）Below lower roller ball is set（35）, the top of waist drum shape hollow casing sets upper roller ball（36）,
Upper roller ball（36）With lower roller ball（35）Respectively with lucite cylinder（47）It is engaged, lucite cylinder（47）For left and right ends
Open cylinder.
6. the method for the actual mining site carbon dioxide long range foam flooding of simulation according to claim 5, it is characterised in that：Institute
The bottom magnetic drive unit stated includes motor（37）, azimuth axis（38）, rotary shaft（39）, insulation gear（40）, magnetic-gear
（41）, azimuth axis（38）It is fixed on motor（37）On, azimuth axis（38）With rotary shaft（39）Connected by conveyer belt, rotary shaft
（39）The other end connection insulation gear（40）, insulate gear（40）With magnetic-gear（41）Engagement.
7. the method for the actual mining site carbon dioxide long range foam flooding of simulation according to claim 6, it is characterised in that：Institute
The forcing pipe stated（31）With CO2Storage tank（3）It is connected.
8. the method for the actual mining site carbon dioxide long range foam flooding of simulation according to claim 7, it is characterised in that：Institute
The T-shaped rigid seal plug stated（21）For non-conductive high pressure resistant material.
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| CN106383220B (en) * | 2016-10-09 | 2018-08-24 | 东北石油大学 | The determination method and system of laboratory experiment non-newtonian fluid injection rate |
| CN106885650A (en) * | 2017-03-29 | 2017-06-23 | 青岛科技大学 | A kind of achievable passive and wireless measures SMART SLEEVE of the displacement process along stroke pressure |
| CN107063937B (en) * | 2017-05-25 | 2019-11-01 | 浙江海洋大学 | A method of measurement air foam effective migration distance between well |
| CN107064434B (en) * | 2017-05-25 | 2020-01-03 | 浙江海洋大学 | Device for measuring effective migration distance of air foam between wells |
| CN108179999A (en) * | 2017-12-30 | 2018-06-19 | 东北石油大学 | Compare the method and apparatus in carbon dioxide-foam flooding displacement stage |
| CN113504351B (en) * | 2021-05-20 | 2022-04-29 | 中国石油大学(北京) | Compact core displacement experimental device |
| CN113804835A (en) * | 2021-09-15 | 2021-12-17 | 西南石油大学 | High-temperature high-pressure long-distance foam evaluation device and method |
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