CN102865898A - Device and method for measuring parallel core foam flooding gas-phase shunt volume - Google Patents
Device and method for measuring parallel core foam flooding gas-phase shunt volume Download PDFInfo
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Abstract
The invention relates to a device for measuring parallel core foam flooding gas-phase shunt volume. The device mainly comprises a foam generating device, an intermediate container for containing formation water, an intermediate container for containing crude oil, a thermostat, core barrels and a data acquiring system, wherein weighing sensors are arranged at the bottom of produced liquid collectors, and are used for monitoring the weight of separated liquid of outlets of the core barrels; and wide-mouth bottles are connected with the produced liquid collectors through gas meters. By the device, the gas-phase shunt volume of parallel cores can be independently measured in real time in a parallel core foam flooding process. Produced liquid at outlet ends of the parallel cores is subjected to gas-liquid separation, and the gas-phase shunt volume of the outlet ends of the parallel cores is measured by using a specific device. Moreover, the device can also be used for measuring the weight of separated liquid of the outlets of the parallel cores, and profile control shunt conditions of foam on high and low permeable formations in the parallel cores under different injection rates can be analyzed by combing liquid injection quantity and change of pressure at two ends of each of the parallel cores.
Description
Technical field
The present invention relates to a kind of device and method of measuring rock core foam flooding gas phase shunt volume in parallel, belong to the technical field of petrochemical complex.
Background technology
Foam has higher apparent viscosity in the stratum, meet oily froth breaking, to meet water stable, profit had the selectively blocking off ability, has higher filtrational resistance at the higher position of water saturation, resistance factor increases along with the increase of permeability, thereby effective shutoff medium to high permeable position, improves sweep efficiency, frothing agent generally all is the surfactant of function admirable simultaneously, can reduce to a certain extent oil water interfacial tension.Therefore, foam profile both can improve sweep efficiency, also can improve oil displacement efficiency, was a kind of rising raising recovery ratio method.Generally adopt at present liquid phase shunt volume assess foam profile modification, this evaluation measures has had corresponding experimental technique and device, but does not also have corresponding experimental technique and device for the shunt volume of gas in the foam profile process.
Interim at " petroleum journal " 2007 the 4th, put down in writing " foam blocking and selective divided-flow experimental study " one piece of article of being delivered by Li Zhaomin.The document has proposed employing core divided-flow displacement experiment device, and the research foam is to the experimental technique of the shunting ability of oil-containing, moisture rock core in parallel.The shunt volume of the outlet liquid in the experimentation under the record different time, experiment draws foam high and low oozing is had the shutoff of selection, embody foam and had preferably temporarily stifled shunting effect, but and the measuring method of the gas distribution amount of not mentioned rock core endpiece in parallel.In the foam profile process, the separating liquid amount of measuring rock core in parallel outlet is different from the meaning of gas distribution amount, by the separating liquid amount can assess foam block up temporarily shunting effect, can analyze the mechanism of foam profile by the gas distribution amount.Both measuring methods also have than big difference, and the separating liquid amount can directly be measured, because gas is compressible, its volume can not directly record, so the measurement of gas distribution amount then needs certain experimental provision to realize.
Summary of the invention
For above technical deficiency, the invention provides a kind of device of measuring rock core foam flooding gas phase shunt volume in parallel.
The present invention also provides a kind of measuring method of utilizing said apparatus to measure rock core gas phase shunt volume in parallel.
Terminological interpretation:
The gas phase shunt volume: refer in the foam flooding process, height oozes the gas volume of rock core and low permeability cores outlet.The gas phase shunt volume is a profound parameter corresponding with the liquid phase shunt volume, can reflect the resident situation of gas in high low permeability cores, has great importance for understanding foam profile mechanism.
Technical scheme of the present invention is as follows:
A kind of device of measuring rock core foam flooding gas phase shunt volume in parallel comprises foam-making apparatus, holds the intermediate receptacle 4 of local water, the intermediate receptacle 5 that holds crude oil, constant temperature oven 27, basket 10, basket 11 and data acquisition system (DAS); Described basket 10 and basket 11 are installed in parallel in described constant temperature oven 27; Described foam-making apparatus, the intermediate receptacle 4 that holds local water, the intermediate receptacle 5 that holds crude oil link to each other with the entrance of basket 10 and basket 11 by six-way valve 9 respectively; Described data acquisition system (DAS) comprises pressure transducer 26, LOAD CELLS 19 and the LOAD CELLS 20 that links to each other with computing machine 25 respectively, described pressure transducer 26 is installed in six-way valve 9 places, be basket 10 and basket 11 inlet ends, described basket 10 outlets link to each other with production fluid gatherer 15 by check valve 13, and described basket 11 outlets link to each other with production fluid gatherer 16 by check valve 14; Described check valve 13 links to each other with wobble pump 12 respectively with check valve 14; Described check valve 13 and check valve 14 are subjected to wobble pump 12 controlled pressures; Described LOAD CELLS 19 is installed in the bottom of production fluid gatherer 15, and described LOAD CELLS 20 is installed in the bottom of production fluid gatherer 16; Described pressure transducer 26 is used for monitoring the inlet pressure of described basket 10 and 11, and described LOAD CELLS 19 and 20 is used for monitoring the weight of described basket 10 and basket 11 outlet minute liquid measures; Wide-necked bottle 23 links to each other with production fluid gatherer 15 by gasometer 21; Wide-necked bottle 24 links to each other with production fluid gatherer 16 by gasometer 22.
Preferred according to the present invention, described foam-making apparatus comprises gas cylinder 1, constant-flux pump 6, constant-flux pump 7, holds the intermediate receptacle 2 of gas, the intermediate receptacle 3 that holds foaming agent solution and frother 8; Describedly hold the intermediate receptacle 2 of gas and the discharge end of the intermediate receptacle 3 that holds foaming agent solution links to each other with the entrance of described frother 8 respectively, described constant-flux pump 6 links to each other with intermediate receptacle 2 bottoms that hold gas, described constant-flux pump 7 links to each other with the bottom of the intermediate receptacle 3 that holds foaming agent solution, the intermediate receptacle 5 that holds crude oil and the intermediate receptacle 4 that holds local water respectively, and described frother 8 links to each other with the entrance of basket 10 and basket 11 by six-way valve 9.The intermediate receptacle 2 that holds gas comes displacement by constant-flux pump 6, and the intermediate receptacle 3 that holds foaming agent solution comes displacement by constant-flux pump 7, forms foam by certain speed displacement gas-liquid out through behind the frother 8 from intermediate receptacle 2,3.
A kind of method of utilizing said apparatus to measure rock core foam flooding gas phase shunt volume in parallel comprises that step is as follows:
Measure the required condition of method of rock core foam flooding gas phase saturation in parallel: the density of foaming agent solution and the equal density of local water; Measuring rock core endpiece gas phase shunt volume in parallel measures under standard atmospheric pressure 0.1MPa.
Preparatory work of experiment:
1. gasometer is carried out school zero: gasometer 21 and gasometer 22 are carried out school zero, adjust the valve of gasometer top, close the valve that leads to the production fluid gatherer, open the valve that leads to atmosphere, then lift high wide-necked bottle equal to the interior liquid level of inner liquid level and gasometer, and to scale mark be 0 place.
2. check the impermeability between production fluid gatherer, gasometer, the wide-necked bottle three: at first close the basket outlet valve, then lift the high wide-necked bottle that fills saturated brine solution, liquid level will be higher than liquid level in the gasometer in the wide-necked bottle, if difference in height is invariable, illustrate that then the device impermeability is good.
(1) simulation oil field formation condition: silica sand is filled and presented respectively basket 10 and basket 11 according to proportioning;
(2) utilize the perm-plug method instrument to measure the permeability of described basket 10 and basket 11, take by weighing basket 10 after the back-up sand and the dry weight of basket 11 and be respectively m
1, m
2
(3) basket 10 after the back-up sand and basket 11 are vacuumized, kept 4 ~ 5 hours;
(4) with basket 10 and basket 11 saturated local water respectively: regulate six-way valve 9, utilize constant-flux pump 7 will hold basket 10 and the basket 11 of the parallel connection of local water displacement to the back-up sand in the intermediate receptacle 4 of local water;
(5) close constant-flux pump 7, take by weighing respectively basket 10 after the back-up sand and the weight in wet base m ' of basket 11
1, m '
2, 1. calculate the volume of voids V of described each basket according to formula
0
In the formula, V
0The volume of voids of the basket the after-back-up sand, mL; Basket dry weight after m-back-up sand, g; Basket weight in wet base after m '-back-up sand, g; The density of ρ-local water, g/cm
3
(6) utilize the basket 10 and 11 after 27 pairs of back-up sands of constant temperature oven to heat, constant temperature is to wanting the simulated formation temperature, and is stand-by;
(7) control wobble pump 12 is regulated the pressure of check valve 13 and 14 to the simulated formation pressure P
h
(8) open constant-flux pump 7, inject simultaneously the foaming agent solution slug to basket 10 in parallel and 11;
(9) measuring basket inlet pressure in parallel is P
0Open gas cylinder 1, be inflated to pressure P to intermediate receptacle 2
0
(10) open gas in the constant-flux pump 6 displacement intermediate receptacles 2, gas and foaming agent solution by volume 1:1 mix, behind frother 8 formation foams, through six-way valve 9, described foam injects basket 10 in parallel and basket 11 with the speed of 1 ~ 5ml/min, the volume that injects foam is 0.3 ~ 6PV, the pressure at record six-way valve 9 places, i.e. basket inlet pressure in parallel;
(11) close constant-flux pump 6;
(12) open constant-flux pump 7, local water is injected basket 10 and basket 11 in parallel by the speed of 1 ~ 5ml/min, basket 10 and basket 11 behind the injection foam are carried out follow-up water drive, the pressure at record six-way valve 9 places, i.e. basket inlet pressure in parallel; Utilize mass sensor 19 and mass sensor 20 records basket 10,11 endpiece liquid phase shunt volume data in parallel, utilize simultaneously gasometer 21 and 22 to record respectively basket 10 in parallel and 11 endpiece gas phase shunt volume data:
Liquid phase shunt volume data, liquid along basket 10 in parallel and the outflow of basket 11 endpiece enters respectively in production fluid gatherer 15 and the production fluid gatherer 16, by the quality of the production fluid gatherer 15 under the balance 17 weighing same time intervals, i.e. basket 10 endpiece liquid phase diverted mass flow; By the quality of the production fluid gatherer 16 under the balance 18 weighing same time intervals, i.e. basket 11 endpiece liquid phase diverted mass flow;
Gas phase shunt volume data, enter respectively in gasometer 21 and the gasometer 22 along basket 10 and basket 11 endpiece effluent airs in parallel, by adjusting the height of wide-necked bottle 23, so that the liquid level in the wide-necked bottle 23 equal with the liquid level in the gasometer 21 (purpose is to guarantee that gasometer 21 interior pressure reduction are atmospheric pressure), the reading of liquid level in the gasometer 21 under the record same time interval, i.e. the gas phase of basket 10 endpiece shunting volume; By adjusting the height of wide-necked bottle 24, so that the liquid level in the wide-necked bottle 24 equal with the liquid level in the gasometer 22 (purpose is to guarantee that gasometer 22 interior pressure reduction are atmospheric pressure), the reading of liquid level in the gasometer 22 under the record same time interval, i.e. the gas phase of basket 11 endpiece shunting volume;
(13) basket 10 of the parallel connection of a calculating said n time point and the liquid phase shunt volume data of basket 11 endpiece: the outlet liquid phase diverted mass flow of basket 10 is M
1, M
2... M
n, then the outlet liquid phase of basket 10 shunting volume is
(n is more than or equal to 1); The outlet liquid phase diverted mass flow of basket 11 is N
1, N
2..., N
n, then the outlet liquid phase of basket 10 shunting volume is
(n is more than or equal to 1) will inject the PV of the fluid of basket
nThe liquid phase volume V of basket 10 endpiece of corresponding parallel connection
LnDraw relation curve a, will inject the PV of the fluid of basket
nThe liquid phase volume V ' of basket 11 endpiece of corresponding parallel connection
LnDraw relation curve b, wherein, PV
nPhysical meaning refer to inject the pore volume injected of fluid,
(n is more than or equal to 1), wherein V is that fluid injects flow velocity, mL/min, specifically refer to the frothing agent slug injection rate, annotate foam speed, follow-up water drive speed, above-mentioned three's speed all equates;
(14) will inject the PV of the fluid of basket
nThe gas phase shunting volume V of corresponding basket 10 endpiece
G1, V
G2..., V
GnDraw relation curve c, will inject the PV of the fluid of basket
nThe gas phase shunting volume V ' of corresponding basket 11 endpiece
G1, V '
G2..., V '
GnDraw relation curve d;
(15) the pressure differential Δ P at calculating basket in parallel two ends
n, Δ P wherein
1=P
1-P
h..., Δ P
n=P
n-P
hThe PV of the fluid of the injection basket that (n is more than or equal to 1) binding time point is corresponding
nDraw relation curve e.
According to above-mentioned relation curve a-e, analyze the profile control shunting situation of foam in rock core in parallel.
The invention has the advantages that:
Utilize device of the present invention, can complete independently measure in real time the gas phase shunt volume of rock core in parallel in the rock core foam displacement process in parallel.Carry out gas-liquid separation by the production fluid to rock core endpiece in parallel, utilize specific device to measure rock core endpiece gas phase shunt volume in parallel, this device also can be measured rock core outlet minute liquid measure in parallel simultaneously, change in conjunction with fluid injection rate IR and rock core pressure at two ends in parallel, can analyze in the rock core in parallel under the different injection rate IRs foam in the profile control shunting situation of high and low pervious course.
Description of drawings
The structural representation of Fig. 1 measurement mechanism of the present invention;
Wherein, 1, gas cylinder; 2, hold the intermediate receptacle of gas; 3, hold the intermediate receptacle of foaming agent solution; 4, hold the intermediate receptacle of local water; 5, hold the intermediate receptacle of crude oil; 6, constant-flux pump; 7, constant-flux pump; 8, frother; 9, six-way valve; 10, basket; 11, basket; 12, wobble pump; 13, check valve; 14, check valve; 15, production fluid gatherer; 16, production fluid gatherer; 17, balance; 18, balance; 19, LOAD CELLS; 20, LOAD CELLS; 21, gasometer; 22, gasometer; 23, wide-necked bottle; 24, wide-necked bottle; 25, computing machine; 26, pressure transducer; 27, constant temperature oven.
Fig. 2 will inject the PV of the fluid of basket
nThe liquid phase volume V of basket 10 endpiece of corresponding parallel connection
LnDraw relation curve a, will inject the PV of the fluid of basket
nThe liquid phase volume V ' of basket 11 endpiece of corresponding parallel connection
LnDraw relation curve b;
Fig. 3 will inject the PV of the fluid of basket
nThe gaseous phase volume V of corresponding basket 10 endpiece
G1, V
G2..., V
GnDraw relation curve c, will inject the PV of the fluid of basket
nThe gaseous phase volume V ' of corresponding basket 11 endpiece
G1, V '
G2..., V '
GnDraw relation curve d;
Fig. 4 is the pressure differential Δ P at basket in parallel two ends
nThe PV of the fluid of the injection basket that binding time point is corresponding
nDraw relation curve e.
Embodiment
Below in conjunction with embodiment and Figure of description the present invention is described in detail, but is not limited to this.
Embodiment 1,
As shown in Figure 1.
A kind of device of measuring rock core foam flooding gas phase shunt volume in parallel comprises foam-making apparatus, holds the intermediate receptacle 4 of local water, the intermediate receptacle 5 that holds crude oil, constant temperature oven 27, basket 10, basket 11 and data acquisition system (DAS); Described basket 10 and basket 11 are installed in parallel in described constant temperature oven 27; Described foam-making apparatus, the intermediate receptacle 4 that holds local water, the intermediate receptacle 5 that holds crude oil link to each other with the entrance of basket 10 and basket 11 by six-way valve 9 respectively; Described data acquisition system (DAS) comprises pressure transducer 26, LOAD CELLS 19 and the LOAD CELLS 20 that links to each other with computing machine 25 respectively, described pressure transducer 26 is installed in six-way valve 9 places, be basket 10 and basket 11 inlet ends, described basket 10 outlets link to each other with production fluid gatherer 15 by check valve 13, and described basket 11 outlets link to each other with production fluid gatherer 16 by check valve 14; Described check valve 13 links to each other with wobble pump 12 respectively with check valve 14; Described check valve 13 and check valve 14 are subjected to wobble pump 12 controlled pressures; Described LOAD CELLS 19 is installed in the bottom of production fluid gatherer 15, and described LOAD CELLS 20 is installed in the bottom of production fluid gatherer 16; Described pressure transducer 26 is used for monitoring the inlet pressure of described basket 10 and 11, and described LOAD CELLS 19 and 20 is used for monitoring the weight of described basket 10 and basket 11 outlet minute liquid measures; Wide-necked bottle 23 links to each other with production fluid gatherer 15 by gasometer 21; Wide-necked bottle 24 links to each other with production fluid gatherer 16 by gasometer 22.
Described foam-making apparatus comprises gas cylinder 1, constant-flux pump 6, constant-flux pump 7, holds the intermediate receptacle 2 of gas, the intermediate receptacle 3 that holds foaming agent solution and frother 8; Describedly hold the intermediate receptacle 2 of gas and the discharge end of the intermediate receptacle 3 that holds foaming agent solution links to each other with the entrance of described frother 8 respectively, described constant-flux pump 6 links to each other with intermediate receptacle 2 bottoms that hold gas, described constant-flux pump 7 links to each other with the bottom of the intermediate receptacle 3 that holds foaming agent solution, the intermediate receptacle 5 that holds crude oil and the intermediate receptacle 4 that holds local water respectively, and described frother 8 links to each other with the entrance of basket 10 and basket 11 by six-way valve 9.The intermediate receptacle 2 that holds gas comes displacement by constant-flux pump 6, and the intermediate receptacle 3 that holds foaming agent solution comes displacement by constant-flux pump 7, forms foam by certain speed displacement gas-liquid out through behind the frother 8 from intermediate receptacle 2,3.
A kind of method of utilizing said apparatus to measure rock core foam flooding gas phase shunt volume in parallel comprises that step is as follows:
Measure the required condition of method of rock core foam flooding gas phase saturation in parallel: the density of foaming agent solution and the equal density of local water; Rock core endpiece gas phase shunt volume in parallel is the flow under the standard atmospheric pressure 0.1MPa.
Preparatory work of experiment:
1. gasometer is carried out school zero: gasometer 21 and gasometer 22 are carried out school zero, adjust the valve of gasometer top, close the valve that leads to the production fluid gatherer, open the valve that leads to atmosphere, then lift high wide-necked bottle equal to the interior liquid level of inner liquid level and gasometer, and to scale mark be 0 place.
2. check the impermeability between production fluid gatherer, gasometer, the wide-necked bottle three: at first close the basket outlet valve, then lift the high wide-necked bottle that fills saturated brine solution, liquid level will be higher than liquid level in the gasometer in the wide-necked bottle, if difference in height is invariable, illustrate that then the device impermeability is good.
(1) simulation oil field formation condition: silica sand is filled and presented respectively basket 10 and basket 11 according to proportioning;
(2) utilize the perm-plug method instrument to measure the permeability of described basket 10 and basket 11, take by weighing basket 10 after the back-up sand and the dry weight of basket 11 and be respectively m
1, m
2
The present embodiment is high to ooze the used silica sand of basket 10 by the mass fraction proportioning: 100～120 purpose silica sands: 20～30 parts; 160～180 purpose silica sands: 70～80 parts.The permeability of the basket 10 at the place of filling and presenting is 489 * 10
-3μ m
2, the dry weight m of described basket 10
1=5607.0g.
The present embodiment low permeability cores pipe 11 used silica sands are pressed the mass fraction proportioning: 80-100 purpose silica sand: 20～30 parts; 100-120 purpose silica sand: 70～80 parts.The permeability of the basket 11 at the place of filling and presenting is 3960 * 10
-3μ m
2, the dry weight m of described basket 11
2=5582.0g.
(3) basket 10 after the back-up sand and basket 11 are vacuumized, kept 4 ~ 5 hours;
(4) with basket 10 and basket 11 saturated local water respectively: regulate six-way valve 9, utilize constant-flux pump 7 will hold basket 10 and the basket 11 of the parallel connection of local water displacement to the back-up sand in the intermediate receptacle 4 of local water;
(5) close constant-flux pump 7, take by weighing respectively basket 10 after the back-up sand and 11 weight in wet base m '
1=5477.4g, m '
21.=5452.7g calculates the volume of voids V of described each basket according to formula
0
In the formula, V
0The volume of voids of the basket the after-back-up sand, mL; Basket dry weight after the m-back-up sand, g; Basket weight in wet base after m '-back-up sand, g; The density of ρ-local water: 1.074g/cm
3
(6) utilize the basket 10 and 11 after 27 pairs of back-up sands of constant temperature oven to heat, constant temperature is to wanting the simulated formation temperature 70 C, and is stand-by;
(7) control wobble pump 12 is regulated the pressure of check valve 13 and 14 to the simulated formation pressure P
h=6MPa;
(8) open constant-flux pump 7, inject simultaneously the foaming agent solution slug of 0.2PV with the speed of 3mL/min to basket 10 in parallel and 11;
(9) measuring basket inlet pressure in parallel is P=6.5MPa; Open gas cylinder 1, be inflated to pressure P to intermediate receptacle 2
0
(10) open gas in the constant-flux pump 6 displacement intermediate receptacles 2, gas in the speed displacement intermediate receptacle 2 of 1.5ml/min is set, the injection rate of constant-flux pump 7 is adjusted into 1.5mL/min, gas and foaming agent solution by volume 1:1 mix, behind frother 8 formation foams, through six-way valve 9, described foam injects basket 10 in parallel and basket 11 with the speed of 3ml/min, the volume that injects foam is 4PV, the pressure at record six-way valve 9 places, i.e. basket inlet pressure in parallel;
(11) close constant-flux pump 6;
(12) open constant-flux pump 7, local water is pressed the speed of 3ml/min and injected basket 10 and basket 11 in parallel, basket 10 and basket 11 behind the injection foam are carried out follow-up water drive, the pressure at record six-way valve 9 places, i.e. basket inlet pressure in parallel; Utilize mass sensor 19 and mass sensor 20 records basket 10,11 endpiece liquid phase shunt volume data in parallel, utilize simultaneously gasometer 21 and 22 to record respectively basket 10 in parallel and 11 endpiece gas phase shunt volume data:
Liquid phase shunt volume data, liquid along basket 10 in parallel and the outflow of basket 11 endpiece enters respectively in production fluid gatherer 15 and the production fluid gatherer 16, by the quality of the production fluid gatherer 15 under the balance 17 weighing same time intervals, i.e. basket 10 endpiece liquid phase diverted mass flow; By the quality of the production fluid gatherer 16 under the balance 18 weighing same time intervals, i.e. basket 11 endpiece liquid phase diverted mass flow;
Gas phase shunt volume data, enter respectively in gasometer 21 and the gasometer 22 along basket 10 and basket 11 endpiece effluent airs in parallel, by adjusting the height of wide-necked bottle 23, so that the liquid level in the wide-necked bottle 23 equal with the liquid level in the gasometer 21 (purpose is to guarantee that gasometer 21 interior pressure reduction are atmospheric pressure), the reading of liquid level in the gasometer 21 under the record same time interval, i.e. the gas phase of basket 10 endpiece shunting volume; By adjusting the height of wide-necked bottle 24, so that the liquid level in the wide-necked bottle 24 equal with the liquid level in the gasometer 22 (purpose is to guarantee that gasometer 22 interior pressure reduction are atmospheric pressure), the reading of liquid level in the gasometer 22 under the record same time interval, i.e. the gas phase of basket 11 endpiece shunting volume;
(13) basket 10 of the parallel connection of a calculating said n time point and the liquid phase shunt volume data of basket 11 endpiece: the outlet liquid phase diverted mass flow of basket 10 is M
1, M
2... M
n, then the outlet liquid phase of basket 10 shunting volume is
(n is more than or equal to 1); The outlet liquid phase diverted mass flow of basket 11 is N
1, N
2..., N
n, then the outlet liquid phase of basket 10 shunting volume is
(n is more than or equal to 1) will inject the PV of the fluid of basket
nThe liquid phase volume V of basket 10 endpiece of corresponding parallel connection
LnDraw relation curve a, will inject the PV of the fluid of basket
nThe liquid phase volume V ' of basket 11 endpiece of corresponding parallel connection
LnDraw relation curve b, wherein, PV
nPhysical meaning refer to inject the pore volume injected of fluid,
(n is more than or equal to 1), wherein V is that fluid injects flow velocity, mL/min, specifically refer to the frothing agent slug injection rate, annotate foam speed, follow-up water drive speed, above-mentioned three's speed all equates;
(14) will inject the PV of the fluid of basket
nThe gas phase shunting volume V of corresponding basket 10 endpiece
G1, V
G2..., V
GnDraw relation curve c, will inject the PV of the fluid of basket
nThe gas phase shunting volume V ' of corresponding basket 11 endpiece
G1, V '
G2..., V '
GnDraw relation curve d;
(15) the pressure differential Δ P at calculating basket in parallel two ends
n, Δ P wherein
1=P
1-P
h..., Δ P
n=P
n-P
hThe PV of the fluid of the injection basket that (n is more than or equal to 1) binding time point is corresponding
nDraw relation curve e.
The basket basic parameter, as shown in table 1:
Table 1: basket data
The record experimental data, as shown in table 2:
Show 2:n the corresponding P of time point
Vn, V
Gn, V '
Gn, V
Ln, V '
LnWith Δ P
nValue
Analyze the profile control shunting situation of foam in rock core in parallel according to above-mentioned relation curve a-e:
Wherein the rock core in the basket 10 is that height oozes rock core; Rock core in the basket 11 is low permeability cores.
Referring to Fig. 2, from curve a, b, can find out, in the foam displacement process, high low permeability layer liquid phase shunt volume be improved significantly, and the mobility reversal development appears, namely the high rock core liquid outlet quantity of oozing is lower than the low permeability cores liquid outlet quantity.The follow-up water drive incipient stage, the shunting action of foam still can be kept a period of time, and along with the increase of the injection rate IR of follow-up water drive, the shunting action of foam weakens gradually;
Referring to Fig. 3, from curve c, d, can find out notes stage foam beginning, high low permeability cores outlet does not have gas to occur, and behind the injection rate IR 0.3PV, high low permeability cores exit gas content begins to increase gradually, and it is more that height oozes the rock core air output, illustrates that more foam enters height and oozes rock core.In the follow-up water drive stage, high low permeability cores air output is still larger, and along with the increase of the injection rate IR of follow-up water drive, high low permeability cores air output reduces gradually;
Referring to Fig. 4, from curve e, can find out, increase along with the foam injection rate IR, increasing foam plays plugging action in rock core, therefore basket in parallel two ends pressure reduction increases gradually, along with the increase of follow-up water drive injection rate IR, the residual foam of rock core reduces gradually, and therefore basket in parallel two ends pressure reduction reduces gradually.
In the foam injection process, high hypotonic basket endpiece air output increases gradually, height oozes the rock core air output apparently higher than the low permeability cores air output, illustrate that foam increases in the injection rate IR that height oozes rock core, plugging action is stronger, rock core two ends displacement pressure reduction in parallel increases gradually, and the shunting action of foam is strengthened gradually.After the foam injection was a certain amount of, foam progressed into low permeability cores, and the low permeability cores air output increases gradually, because foam oozes the stronger plugging action of rock core at height, and the existing mobility reversal development of high low leaching.In the follow-up water drive process, high low permeability cores air output is kept after the short period and is reduced gradually, and the air output of low permeability cores descends comparatively fast, illustrates that foam is displaced in high low permeability cores gradually, so the shunting action of foam is kept gradually and weakened.
Claims (3)
1. device of measuring rock core foam flooding gas phase shunt volume in parallel, it is characterized in that, this device comprises foam-making apparatus, hold the intermediate receptacle of local water (4), hold intermediate receptacle (5), constant temperature oven (27), basket (10), basket (11) and the data acquisition system (DAS) of crude oil; Described basket (10) and basket (11) are installed in parallel in described constant temperature oven (27); Described foam-making apparatus, the intermediate receptacle (4) that holds local water, the intermediate receptacle (5) that holds crude oil link to each other with the entrance of basket (10) and basket (11) by six-way valve (9) respectively; Described data acquisition system (DAS) comprises pressure transducer (26), LOAD CELLS (19) and the LOAD CELLS (20) that links to each other with computing machine (25) respectively, described pressure transducer (26) is installed in six-way valve (9) and locates, be basket (10) and basket (11) inlet end, described basket (10) outlet links to each other with production fluid gatherer (15) by check valve (13), and described basket (11) outlet links to each other with production fluid gatherer (16) by check valve (14); Described check valve (13) links to each other with wobble pump (12) respectively with check valve (14); Described check valve (13) and check valve (14) are subjected to wobble pump (12) controlled pressure; Described LOAD CELLS (19) is installed in the bottom of production fluid gatherer (15), and described LOAD CELLS (20) is installed in the bottom of production fluid gatherer (16); Described pressure transducer (26) is used for monitoring the inlet pressure of described basket (10) and (11), and described LOAD CELLS (19) and (20) are used for monitoring the weight of described basket (10) and basket (11) outlet minute liquid measure; Wide-necked bottle (23) links to each other with production fluid gatherer (15) by gasometer (21); Wide-necked bottle (24) links to each other with production fluid gatherer (16) by gasometer (22).
2. a kind of device of measuring rock core foam flooding gas phase shunt volume in parallel according to claim 1, it is characterized in that, described foam-making apparatus comprises gas cylinder (1), constant-flux pump (6), constant-flux pump (7), holds the intermediate receptacle (2) of gas, the intermediate receptacle (3) that holds foaming agent solution and frother (8); Describedly hold the intermediate receptacle (2) of gas and the discharge end of the intermediate receptacle that holds foaming agent solution (3) links to each other with the entrance of described frother (8) respectively, described constant-flux pump (6) links to each other with the intermediate receptacle that holds gas (2) bottom, described constant-flux pump (7) links to each other with the bottom of the intermediate receptacle that holds foaming agent solution (3), the intermediate receptacle (5) that holds crude oil and the intermediate receptacle that holds local water (4) respectively, and described frother (8) links to each other with the entrance of basket (10) and basket (11) by six-way valve (9).
3. one kind is utilized the as claimed in claim 1 method of measurement device rock core foam flooding in parallel gas phase shunt volume, it is characterized in that, comprises that step is as follows:
(1) simulation oil field formation condition: silica sand is filled and presented respectively basket (10) and basket (11) according to proportioning;
(2) utilize the perm-plug method instrument to measure the permeability of described basket (10) and basket (11), take by weighing basket (10) after the back-up sand and the dry weight of basket (11) and be respectively m1, m2;
(3) basket after the back-up sand (10) and basket (11) are vacuumized, kept 4 ~ 5 hours;
(4) with basket (10) and basket (11) saturated local water respectively: regulate six-way valve (9), utilize constant-flux pump (7) will hold basket (10) and the basket (11) of the parallel connection of local water displacement to the back-up sand in the intermediate receptacle (4) of local water;
(5) close constant-flux pump (7), take by weighing respectively basket (10) after the back-up sand and the weight in wet base m ' of basket (11)
1, m '
2, 1. calculate the volume of voids V of described each basket according to formula
0
In the formula, V
0The volume of voids of the basket the after-back-up sand, mL; Basket dry weight after m-back-up sand, g; Basket weight in wet base after m '-back-up sand, g; The density of ρ-local water, g/cm
3
(6) utilize constant temperature oven (27) that the basket after the back-up sand (10) and (11) are heated, constant temperature is to wanting the simulated formation temperature, and is stand-by;
(7) control wobble pump (12) is regulated the pressure of check valve (13) and (14) to the simulated formation pressure P
h
(8) open constant-flux pump (7), inject simultaneously the foaming agent solution slug to basket in parallel (10) and (11);
(9) measuring basket inlet pressure in parallel is P
0Open gas cylinder (1), be inflated to pressure P to intermediate receptacle (2)
0
(10) open gas in constant-flux pump (6) the displacement intermediate receptacle (2), gas and foaming agent solution by volume 1:1 mix, behind frother (8) formation foam, through six-way valve (9), described foam injects basket in parallel (10) and basket (11) with the speed of 1 ~ 5ml/min, the volume that injects foam is 0.3 ~ 6PV, the pressure that record six-way valve (9) is located, i.e. basket inlet pressure in parallel;
(11) close constant-flux pump (6);
(12) open constant-flux pump (7), local water is injected basket (10) and basket (11) in parallel by the speed of 1 ~ 5ml/min, basket (10) and basket (11) behind the injection foam are carried out follow-up water drive, the pressure that record six-way valve (9) is located, i.e. basket inlet pressure in parallel; Utilize mass sensor (19) and mass sensor (20) record basket (10), (11) endpiece liquid phase shunt volume data in parallel, utilize simultaneously gasometer (21) and (22) to record respectively basket in parallel (10) and (11) endpiece gas phase shunt volume data:
Liquid phase shunt volume data, liquid along basket (10) in parallel and the outflow of basket (11) endpiece enters respectively in production fluid gatherer (15) and the production fluid gatherer (16), by the quality of the production fluid gatherer (15) under balance (17) the weighing same time interval, i.e. basket (10) endpiece liquid phase diverted mass flow; By the quality of the production fluid gatherer (16) under balance (18) the weighing same time interval, i.e. basket (11) endpiece liquid phase diverted mass flow;
Gas phase shunt volume data, enter respectively in gasometer (21) and the gasometer (22) along basket (10) and basket (11) endpiece effluent air in parallel, by adjusting the height of wide-necked bottle (23), so that the liquid level in the wide-necked bottle (23) is equal with the liquid level in the gasometer (21), the reading of liquid level in the gasometer (21) under the record same time interval, i.e. the gas phase of basket (10) endpiece shunting volume; By adjusting the height of wide-necked bottle (24), so that the liquid level in the wide-necked bottle (24) is equal with the liquid level in the gasometer (22), the reading of liquid level in the gasometer (22) under the record same time interval, i.e. the gas phase of basket (11) endpiece shunting volume;
(13) basket (10) of the parallel connection of a calculating said n time point and the liquid phase shunt volume data of basket (11) endpiece: the outlet liquid phase diverted mass flow of basket (10) is M
1, M
2... M
n, then the outlet liquid phase of basket (10) shunting volume is
(n is more than or equal to 1); The outlet liquid phase diverted mass flow of basket (11) is N
1, N
2..., N
n, then the outlet liquid phase of basket (10) shunting volume is
(n is more than or equal to 1) will inject the PV of the fluid of basket
nThe liquid phase volume V of basket (10) endpiece of corresponding parallel connection
LnDraw relation curve a, will inject the PV of the fluid of basket
nThe liquid phase volume V ' of basket (11) endpiece of corresponding parallel connection
LnDraw relation curve b, wherein, PV
nPhysical meaning refer to inject the pore volume injected of fluid,
(n is more than or equal to 1), wherein V is that fluid injects flow velocity, mL/min, specifically refer to the frothing agent slug injection rate, annotate foam speed, follow-up water drive speed, above-mentioned three's speed all equates;
(14) will inject the PV of the fluid of basket
nThe gas phase shunting volume V of corresponding basket (10) endpiece
G1, V
G2..., V
GnDraw relation curve c, will inject the PV of the fluid of basket
nThe gas phase shunting volume V ' of corresponding basket (11) endpiece
G1, V '
G2..., V '
GnDraw relation curve d;
(15) the pressure differential Δ P at calculating basket in parallel two ends
n, Δ P wherein
1=P
1-P
h..., Δ P
n=P
n-P
hThe PVn of the fluid of the injection basket that (n is more than or equal to 1) binding time point is corresponding draws relation curve e.
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