CN102865898B - 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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- CN102865898B CN102865898B CN201210309145.0A CN201210309145A CN102865898B CN 102865898 B CN102865898 B CN 102865898B CN 201210309145 A CN201210309145 A CN 201210309145A CN 102865898 B CN102865898 B CN 102865898B
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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 stratum, meet oily froth breaking, to meet water stable, profit is had to selectively blocking off ability, there is 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 is all generally 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.The general liquid phase shunt volume assess foam profile modification that adopts at present, this evaluation measures has had corresponding experimental technique and device, but also there is no corresponding experimental technique and device for the shunt volume of gas in foam profile process.
Interim at " petroleum journal " 2007 the 4th, record " foam blocking and selective divided-flow experimental study " one section of article of being delivered by Li Zhaomin.The document has proposed employing core divided-flow displacement experiment device, the experimental technique of the shunting ability of research foam to oil-containing, moisture rock core in parallel.In experimentation, record the shunt volume of the outlet liquid under different time, experiment show that foam has to high and low oozing the shutoff of selection, embody foam and there is temporarily stifled shunting effect preferably, but and the measuring method of the gas distribution amount of not mentioned rock core endpiece in parallel.In foam profile process, the separating liquid amount of measuring rock core in parallel outlet is different from the meaning of gas distribution amount, can assess foam by separating liquid amount block up temporarily shunting effect, can analyze the mechanism of foam profile by gas distribution amount.Both measuring methods also have bigger difference, and separating liquid amount can directly be measured, and because gas is compressible, its volume can not directly record, and therefore the measurement of gas distribution amount 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:
Gas phase shunt volume: refer in foam flooding process, height oozes the gas volume of rock core and low permeability cores outlet.Gas phase shunt volume is a profound parameter corresponding with 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:
Measure a device for rock core foam flooding gas phase shunt volume in parallel, comprise foam-making apparatus, hold 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 are connected with the entrance of basket 10 and basket 11 by six-way valve 9 respectively; Described data acquisition system (DAS) comprises the pressure transducer 26, LOAD CELLS 19 and the LOAD CELLS 20 that are connected with computing machine 25 respectively, described pressure transducer 26 is arranged on six-way valve 9 places, be basket 10 and basket 11 inlet ends, described basket 10 outlets are connected with production fluid gatherer 15 by check valve 13, and described basket 11 outlets are connected with production fluid gatherer 16 by check valve 14; Described check valve 13 is connected with wobble pump 12 respectively with check valve 14; Described check valve 13 and check valve 14 are subject to wobble pump 12 controlled pressures; Described LOAD CELLS 19 is arranged on the bottom of production fluid gatherer 15, and described LOAD CELLS 20 is arranged on the bottom of production fluid gatherer 16; Described pressure transducer 26 is for monitoring the inlet pressure of described basket 10 and 11, and described LOAD CELLS 19 and 20 is for monitoring the weight of described basket 10 and basket 11 outlet point liquid measures; Wide-necked bottle 23 is connected with production fluid gatherer 15 by gasometer 21; Wide-necked bottle 24 is connected 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; The described intermediate receptacle 2 that holds gas is connected with the entrance of described frother 8 respectively with the discharge end of the intermediate receptacle 3 that holds foaming agent solution, described constant-flux pump 6 is connected with intermediate receptacle 2 bottoms that hold gas, described constant-flux pump 7 respectively with hold the intermediate receptacle 3 of foaming agent solution, the intermediate receptacle 5 that holds crude oil is connected with the bottom of the intermediate receptacle 4 that holds local water, described frother 8 is connected with the entrance of basket 10 and basket 11 by six-way valve 9.The intermediate receptacle 2 that holds gas carrys out displacement by constant-flux pump 6, and the intermediate receptacle 3 that holds foaming agent solution carrys out displacement by constant-flux pump 7, forms foam from intermediate receptacle 2,3 by certain speed displacement gas-liquid out after frother 8.
Utilize said apparatus to measure a method for rock core foam flooding gas phase shunt volume in parallel, comprise 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; Measure rock core endpiece gas phase shunt volume in parallel measures under standard atmospheric pressure 0.1MPa.
Preparatory work of experiment:
1. pair gasometer carries out school zero: gasometer 21 and gasometer 22 are carried out to school zero, adjust the valve of gasometer top, close the valve that leads to 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. the impermeability between inspection production fluid gatherer, gasometer, wide-necked bottle three: first close basket outlet valve, then lift the high wide-necked bottle that fills saturated brine solution, in wide-necked bottle, liquid level will be higher than liquid level in gasometer, if difference in height is invariable, illustrate that device impermeability is good.
(1) simulation oil field formation condition: silica sand is filled and presented respectively to basket 10 and basket 11 according to proportioning;
(2) utilize perm-plug method instrument to measure the permeability of described basket 10 and basket 11, take basket 10 after back-up sand and the dry weight of basket 11 and be respectively m
1, m
2;
(3) basket after back-up sand 10 and basket 11 are vacuumized, keep 4 ~ 5 hours;
(4) by basket 10 and basket 11 saturated local water respectively: regulate six-way valve 9, utilize constant-flux pump 7 to hold local water displacement in the intermediate receptacle 4 of local water to basket in parallel 10 and basket 11 after back-up sand;
(5) close constant-flux pump 7, take respectively basket 10 after 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 formula, V
0the volume of voids of the basket 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 to heat the basket 10 and 11 after back-up sand, constant temperature is to wanting simulated formation temperature, stand-by;
(7) control wobble pump 12, regulate the pressure of check valve 13 and 14 to simulated formation pressure P
h;
(8) open constant-flux pump 7, inject foaming agent solution slug to basket 10 and 11 in parallel simultaneously;
(9) measuring basket inlet pressure in parallel is P
0; Open gas cylinder 1, be inflated to pressure P to intermediate receptacle 2
0;
(10) open the gas in constant-flux pump 6 displacement intermediate receptacles 2, gas and foaming agent solution by volume 1:1 mix, form after foam through frother 8, 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, records the pressure at 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 to basket in parallel 10 and basket 11 by the speed of 1 ~ 5ml/min, the basket 10 and the basket 11 that inject after foam are carried out to follow-up water drive, record the pressure at six-way valve 9 places, be i.e. basket inlet pressure in parallel; Utilize mass sensor 19 and mass sensor 20 to record basket in parallel 10,11 endpiece liquid phase shunt volume data, utilize gasometer 21 and 22 to record respectively basket 10 and 11 endpiece gas phase shunt volume data in parallel simultaneously:
Liquid phase shunt volume data, liquid along basket in parallel 10 and basket 11 endpiece outflows enters respectively in production fluid gatherer 15 and production fluid gatherer 16, weigh the quality of the production fluid gatherer 15 under same time interval by balance 17, i.e. basket 10 endpiece liquid phase diverted mass flow; Weigh the quality of the production fluid gatherer 16 under same time interval by balance 18, i.e. basket 11 endpiece liquid phase diverted mass flow;
Gas phase shunt volume data, enter respectively in gasometer 21 and gasometer 22 along basket in parallel 10 and basket 11 endpiece effluent airs, by adjusting the height of wide-necked bottle 23, make the liquid level equal with the liquid level in gasometer 21 (object is to ensure that the interior pressure reduction of gasometer 21 is atmospheric pressure) in wide-necked bottle 23, record under same time interval the reading of liquid level in gasometer 21, i.e. the gas phase of basket 10 endpiece shunting volume; By adjusting the height of wide-necked bottle 24, make the liquid level equal with the liquid level in gasometer 22 (object is to ensure that the interior pressure reduction of gasometer 22 is atmospheric pressure) in wide-necked bottle 24, record under same time interval the reading of liquid level in gasometer 22, i.e. the gas phase of basket 11 endpiece shunting volume;
(13) calculate the basket in parallel 10 of a 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, 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, the outlet liquid phase of basket 10 shunting volume is
(n is more than or equal to 1), by the PV of the fluid of injection basket
nthe liquid phase volume V of corresponding basket 10 endpiece in parallel
lndraw relation curve a, by the PV of the fluid of injection basket
nthe liquid phase volume V ' of corresponding basket 11 endpiece in parallel
lndraw relation curve b, wherein, PV
nphysical meaning refer to and inject the pore volume injected of fluid,
(n is more than or equal to 1), wherein V is that fluid injects flow velocity, and mL/min specifically refers to injection rate, note foam speed, the follow-up water drive speed of frothing agent slug, and above-mentioned three's speed all equates;
(14) by the PV of the fluid of injection basket
nthe gas phase shunting volume V of corresponding basket 10 endpiece
g1, V
g2..., V
gndraw relation curve c, by the PV of the fluid of injection basket
nthe gas phase shunting volume V ' of corresponding basket 11 endpiece
g1, V '
g2..., V '
gndraw relation curve d;
(15) calculate the pressure differential Δ P at basket in parallel two ends
n, wherein Δ P
1=P
1-P
h..., Δ P
n=P
n-P
h(n is more than or equal to 1) binding time is put the PV of the fluid of corresponding injection basket
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 rock core foam displacement process in parallel.By the production fluid of rock core endpiece in parallel is carried out to gas-liquid separation, utilize specific device to measure rock core endpiece gas phase shunt volume in parallel, this device also can be measured rock core outlet point 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 rock core in parallel under different injection rate IRs foam in the profile control shunting situation of high and low pervious course.
Brief description of the 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 is by the PV of the fluid of injection basket
nthe liquid phase volume V of corresponding basket 10 endpiece in parallel
lndraw relation curve a, by the PV of the fluid of injection basket
nthe liquid phase volume V ' of corresponding basket 11 endpiece in parallel
lndraw relation curve b;
Fig. 3 is by the PV of the fluid of injection basket
nthe gaseous phase volume V of corresponding basket 10 endpiece
g1, V
g2..., V
gndraw relation curve c, by the PV of the fluid of injection 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
nbinding time is put the PV of the fluid of corresponding injection basket
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.
Measure a device for rock core foam flooding gas phase shunt volume in parallel, comprise foam-making apparatus, hold 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 are connected with the entrance of basket 10 and basket 11 by six-way valve 9 respectively; Described data acquisition system (DAS) comprises the pressure transducer 26, LOAD CELLS 19 and the LOAD CELLS 20 that are connected with computing machine 25 respectively, described pressure transducer 26 is arranged on six-way valve 9 places, be basket 10 and basket 11 inlet ends, described basket 10 outlets are connected with production fluid gatherer 15 by check valve 13, and described basket 11 outlets are connected with production fluid gatherer 16 by check valve 14; Described check valve 13 is connected with wobble pump 12 respectively with check valve 14; Described check valve 13 and check valve 14 are subject to wobble pump 12 controlled pressures; Described LOAD CELLS 19 is arranged on the bottom of production fluid gatherer 15, and described LOAD CELLS 20 is arranged on the bottom of production fluid gatherer 16; Described pressure transducer 26 is for monitoring the inlet pressure of described basket 10 and 11, and described LOAD CELLS 19 and 20 is for monitoring the weight of described basket 10 and basket 11 outlet point liquid measures; Wide-necked bottle 23 is connected with production fluid gatherer 15 by gasometer 21; Wide-necked bottle 24 is connected 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; The described intermediate receptacle 2 that holds gas is connected with the entrance of described frother 8 respectively with the discharge end of the intermediate receptacle 3 that holds foaming agent solution, described constant-flux pump 6 is connected with intermediate receptacle 2 bottoms that hold gas, described constant-flux pump 7 respectively with hold the intermediate receptacle 3 of foaming agent solution, the intermediate receptacle 5 that holds crude oil is connected with the bottom of the intermediate receptacle 4 that holds local water, described frother 8 is connected with the entrance of basket 10 and basket 11 by six-way valve 9.The intermediate receptacle 2 that holds gas carrys out displacement by constant-flux pump 6, and the intermediate receptacle 3 that holds foaming agent solution carrys out displacement by constant-flux pump 7, forms foam from intermediate receptacle 2,3 by certain speed displacement gas-liquid out after frother 8.
Embodiment 2,
Utilize said apparatus to measure a method for rock core foam flooding gas phase shunt volume in parallel, comprise 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 standard atmospheric pressure 0.1MPa.
Preparatory work of experiment:
1. pair gasometer carries out school zero: gasometer 21 and gasometer 22 are carried out to school zero, adjust the valve of gasometer top, close the valve that leads to 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. the impermeability between inspection production fluid gatherer, gasometer, wide-necked bottle three: first close basket outlet valve, then lift the high wide-necked bottle that fills saturated brine solution, in wide-necked bottle, liquid level will be higher than liquid level in gasometer, if difference in height is invariable, illustrate that device impermeability is good.
(1) simulation oil field formation condition: silica sand is filled and presented respectively to basket 10 and basket 11 according to proportioning;
(2) utilize perm-plug method instrument to measure the permeability of described basket 10 and basket 11, take basket 10 after back-up sand and the dry weight of basket 11 and be respectively m
1, m
2;
The present embodiment is high oozes basket 10 silica sand used by mass fraction proportioning: 100～120 object silica sands: 20～30 parts; 160～180 object 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 silica sands used are pressed mass fraction proportioning: 80-100 object silica sand: 20～30 parts; 100-120 object 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 after back-up sand 10 and basket 11 are vacuumized, keep 4 ~ 5 hours;
(4) by basket 10 and basket 11 saturated local water respectively: regulate six-way valve 9, utilize constant-flux pump 7 to hold local water displacement in the intermediate receptacle 4 of local water to basket in parallel 10 and basket 11 after back-up sand;
(5) close constant-flux pump 7, take respectively the weight in wet base m ' of the basket 10 and 11 after back-up sand
1=5477.4g, m '
2=5452.7g, 1. calculates the volume of voids V of described each basket according to formula
0
In formula, V
0the volume of voids of the basket 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: 1.074g/cm
3;
(6) utilize constant temperature oven 27 to heat the basket 10 and 11 after back-up sand, constant temperature is to wanting simulated formation temperature 70 C, stand-by;
(7) control wobble pump 12, regulate the pressure of check valve 13 and 14 to simulated formation pressure P
h=6MPa;
(8) open constant-flux pump 7, inject the foaming agent solution slug of 0.2PV with the speed of 3mL/min to basket 10 and 11 in parallel simultaneously;
(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 the gas in 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, form after foam through frother 8, 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, record the pressure at 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 to basket in parallel 10 and basket 11 by the speed of 3ml/min, the basket 10 and the basket 11 that inject after foam are carried out to follow-up water drive, record the pressure at six-way valve 9 places, be i.e. basket inlet pressure in parallel; Utilize mass sensor 19 and mass sensor 20 to record basket in parallel 10,11 endpiece liquid phase shunt volume data, utilize gasometer 21 and 22 to record respectively basket 10 and 11 endpiece gas phase shunt volume data in parallel simultaneously:
Liquid phase shunt volume data, liquid along basket in parallel 10 and basket 11 endpiece outflows enters respectively in production fluid gatherer 15 and production fluid gatherer 16, weigh the quality of the production fluid gatherer 15 under same time interval by balance 17, i.e. basket 10 endpiece liquid phase diverted mass flow; Weigh the quality of the production fluid gatherer 16 under same time interval by balance 18, i.e. basket 11 endpiece liquid phase diverted mass flow;
Gas phase shunt volume data, enter respectively in gasometer 21 and gasometer 22 along basket in parallel 10 and basket 11 endpiece effluent airs, by adjusting the height of wide-necked bottle 23, make the liquid level equal with the liquid level in gasometer 21 (object is to ensure that the interior pressure reduction of gasometer 21 is atmospheric pressure) in wide-necked bottle 23, record under same time interval the reading of liquid level in gasometer 21, i.e. the gas phase of basket 10 endpiece shunting volume; By adjusting the height of wide-necked bottle 24, make the liquid level equal with the liquid level in gasometer 22 (object is to ensure that the interior pressure reduction of gasometer 22 is atmospheric pressure) in wide-necked bottle 24, record under same time interval the reading of liquid level in gasometer 22, i.e. the gas phase of basket 11 endpiece shunting volume;
(13) calculate the basket in parallel 10 of a 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, 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, the outlet liquid phase of basket 10 shunting volume is
(n is more than or equal to 1), by the PV of the fluid of injection basket
nthe liquid phase volume V of corresponding basket 10 endpiece in parallel
lndraw relation curve a, by the PV of the fluid of injection basket
nthe liquid phase volume V ' of corresponding basket 11 endpiece in parallel
lndraw relation curve b, wherein, PV
nphysical meaning refer to and inject the pore volume injected of fluid,
(n is more than or equal to 1), wherein V is that fluid injects flow velocity, and mL/min specifically refers to injection rate, note foam speed, the follow-up water drive speed of frothing agent slug, and above-mentioned three's speed all equates;
(14) by the PV of the fluid of injection basket
nthe gas phase shunting volume V of corresponding basket 10 endpiece
g1, V
g2..., V
gndraw relation curve c, by the PV of the fluid of injection basket
nthe gas phase shunting volume V ' of corresponding basket 11 endpiece
g1, V '
g2..., V '
gndraw relation curve d;
(15) calculate the pressure differential Δ P at basket in parallel two ends
n, wherein Δ P
1=P
1-P
h..., Δ P
n=P
n-P
h(n is more than or equal to 1) binding time is put the PV of the fluid of corresponding injection basket
ndraw relation curve e.
Basket basic parameter, as shown in table 1:
Table 1: basket data
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 basket 10 is that height oozes rock core; Rock core in basket 11 is low permeability cores.
Referring to Fig. 2, from curve a, b, can find out, in foam displacement process, high low permeability layer liquid phase shunt volume be improved significantly, and there is mobility reversal development, the high rock core liquid outlet quantity of oozing is lower than low permeability cores liquid outlet quantity.The follow-up water drive incipient stage, the shunting action of foam still can maintain 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 note stage foam beginning, high low permeability cores outlet does not have gas to occur, after injection rate IR 0.3PV, high low permeability cores exit gas content starts to increase gradually, and it is more that height oozes rock core air output, illustrate 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, along with the increase of 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 foam injection process, high hypotonic basket endpiece air output increases gradually, height oozes rock core air output apparently higher than low permeability cores air output, illustrate that the injection rate IR that foam oozes rock core at height increases, plugging action is stronger, rock core two ends displacement pressure reduction in parallel increases gradually, and the shunting action of foam is strengthened gradually.Foam inject a certain amount of after, foam progresses into low permeability cores, low permeability cores air output increases gradually, because foam oozes the stronger plugging action of rock core at height, the existing mobility reversal development of high low leaching.In follow-up water drive process, high low permeability cores air output reduces after maintaining the short period gradually, and the decline of the air output of low permeability cores is very fast, illustrates that foam is displaced gradually in high low permeability cores, and therefore the shunting action of foam maintains gradually and weakens.
Claims (2)
1. measure the device of rock core foam flooding gas phase shunt volume in parallel for one kind, it is characterized in that, this device comprises foam-making apparatus, hold the intermediate receptacle 4 of local water, hold intermediate receptacle 5, constant temperature oven 27, the first basket 10, second basket 11 and the data acquisition system (DAS) of crude oil; Described the first basket 10 and the second 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 are connected with the entrance of the first basket 10 and the second basket 11 by six-way valve 9 respectively; Described data acquisition system (DAS) comprises the pressure transducer 26, the first LOAD CELLS 19 and the second LOAD CELLS 20 that are connected with computing machine 25 respectively, described pressure transducer 26 is arranged on six-way valve 9 places, i.e. the first basket 10 and the second basket 11 inlet ends, described the first basket 10 outlets are connected with the first production fluid gatherer 15 by the first check valve 13, and described the second basket 11 outlets are connected with the second production fluid gatherer 16 by the second check valve 14; The first described check valve 13 is connected with wobble pump 12 respectively with the second check valve 14; Described the first check valve 13 and the second check valve 14 are subject to wobble pump 12 controlled pressures; Described the first LOAD CELLS 19 is arranged on the bottom of the first production fluid gatherer 15, and described the second LOAD CELLS 20 is arranged on the bottom of the second production fluid gatherer 16; Described pressure transducer 26 is for monitoring the inlet pressure of described the first basket 10 and the second basket 11, and the first described LOAD CELLS 19 and the second LOAD CELLS 20 are respectively used to monitor the weight of described the first basket 10 and the second basket 11 outlet point liquid measures; The first wide-necked bottle 23 is connected with the first production fluid gatherer 15 by the first gasometer 21; The second wide-necked bottle 24 is connected with the second production fluid gatherer 16 by the second gasometer 22; Described foam-making apparatus, comprises gas cylinder 1, the first constant-flux pump 6, the second constant-flux pump 7, the intermediate receptacle 2 that holds gas, the intermediate receptacle 3 that holds foaming agent solution and frother 8; The described intermediate receptacle 2 that holds gas is connected with the entrance of described frother 8 respectively with the discharge end of the intermediate receptacle 3 that holds foaming agent solution, described the first constant-flux pump 6 is connected with intermediate receptacle 2 bottoms that hold gas, described the second constant-flux pump 7 respectively with hold the intermediate receptacle 3 of foaming agent solution, the intermediate receptacle 5 that holds crude oil is connected with the bottom of the intermediate receptacle 4 that holds local water, described frother 8 is connected with the entrance of the first basket 10 and the second basket 11 by six-way valve 9.
2. utilize a method for measurement device rock core foam flooding in parallel gas phase shunt volume as claimed in claim 1, it is characterized in that, comprise that step is as follows:
(1) simulation oil field formation condition: silica sand is filled and presented respectively to the first basket 10 and the second basket 11 according to proportioning;
(2) utilize perm-plug method instrument to measure the permeability of described the first basket 10 and the second basket 11, take the first basket 10 after back-up sand and the dry weight of the second basket 11 and be respectively m
1, m
2;
(3) the first basket 10 after back-up sand and the second basket 11 are vacuumized, keep 4～5 hours;
(4) by the first basket 10 and the second basket 11 saturated local water respectively: regulate six-way valve 9, utilize the second constant-flux pump 7 to hold local water displacement in the intermediate receptacle 4 of local water to the first basket 10 in parallel and the second basket 11 after back-up sand;
(5) close the second constant-flux pump 7, take respectively the first basket 10 after back-up sand and the weight in wet base m ' of the second basket 11
1, m '
2, the volume of voids V of the each basket 1. calculating according to formula
0
In formula, V
0the volume of voids of the basket 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 to heat the first basket 10 after back-up sand and the second basket 11, constant temperature is to wanting simulated formation temperature, stand-by;
(7) control wobble pump 12, regulate the pressure of the first check valve 13 and the second check valve 14 to simulated formation pressure P
h;
(8) open the second constant-flux pump 7, inject foaming agent solution slug to the first basket 10 in parallel and the second basket 11 simultaneously;
(9) measuring basket inlet pressure in parallel is P
0; Open gas cylinder 1, be inflated to pressure P to the intermediate receptacle 2 that holds gas
0;
(10) open the gas in the intermediate receptacle 2 that the first constant-flux pump 6 displacements hold gas, gas and foaming agent solution by volume 1:1 mix, form after foam through frother 8, through six-way valve 9, described foam injects the first basket 10 in parallel and the second basket 11 with the speed of 1～5ml/min, the volume that injects foam is 0.3～6PV, records the pressure at six-way valve 9 places, i.e. the first basket 10 and the second basket 11 inlet pressures in parallel;
(11) close the first constant-flux pump 6;
(12) open the second constant-flux pump 7, local water is injected to the first basket 10 and the second basket 11 in parallel by the speed of 1～5ml/min, the first basket 10 and the second basket 11 that inject after foam are carried out to follow-up water drive, record the pressure at six-way valve 9 places, i.e. the first basket 10 and the second basket 11 inlet pressures in parallel; Utilize the first LOAD CELLS 19 and the second LOAD CELLS 20 record the first basket 10, the second basket 11 endpiece liquid phase shunt volume data in parallel, utilize the first gasometer 21 and the second gasometer 22 to record respectively the first basket 10 in parallel and the second basket 11 endpiece gas phase shunt volume data simultaneously:
Liquid phase shunt volume data, liquid along the first basket 10 in parallel and the second basket 11 endpiece outflows enters respectively in the first production fluid gatherer 15 and the second production fluid gatherer 16, weigh the quality of the first production fluid gatherer 15 under same time interval by the first balance 17, i.e. the first basket 10 endpiece liquid phase diverted mass flow; Weigh the quality of the second production fluid gatherer 16 under same time interval by the second balance 18, i.e. the second basket 11 endpiece liquid phase diverted mass flow;
Gas phase shunt volume data, enter respectively in the first gasometer 21 and the second gasometer 22 along the first basket 10 and the second basket 11 endpiece effluent airs in parallel, by adjusting the height of the first wide-necked bottle 23, make the liquid level in the first wide-necked bottle 23 equal with the liquid level in the first gasometer 21, object is to ensure that the interior pressure reduction of the first gasometer 21 is atmospheric pressure, record under same time interval the reading of liquid level in the first gasometer 21, i.e. the gas phase of the first basket 10 endpiece shunting volume; By adjusting the height of the second wide-necked bottle 24, make the liquid level in the second wide-necked bottle 24 equal with the liquid level in the second gasometer 22, object is to ensure that the interior pressure reduction of the second gasometer 22 is atmospheric pressure, record under same time interval the reading of liquid level in the second gasometer 22, i.e. the gas phase of the second basket 11 endpiece shunting volume;
(13) calculate first basket 10 in parallel of n time point and the liquid phase shunt volume data of the second basket 11 endpiece: the outlet liquid phase diverted mass flow of the first basket 10 is M
1, M
2... Mn, the outlet liquid phase of the first basket 10 shunting volume is
n is more than or equal to 1; The outlet liquid phase diverted mass flow of the second basket 11 is N
1, N
2..., Nn, the outlet liquid phase of the first basket 10 shunting volume is
n is more than or equal to 1, by the PV of the fluid of injection basket
nthe liquid phase volume V of corresponding the first basket 10 endpiece in parallel
lndraw relation curve a, by the PV of the fluid of injection basket
nthe liquid phase volume V ' of corresponding the second basket 11 endpiece in parallel
lndraw relation curve b, wherein, PV
nphysical meaning refer to and inject the pore volume injected of fluid,
n is more than or equal to 1, and wherein V is that fluid injects flow velocity, and mL/min specifically refers to injection rate, note foam speed, the follow-up water drive speed of frothing agent slug, and above-mentioned three's speed all equates;
(14) by the PV of the fluid of injection basket
nthe gas phase shunting volume V of corresponding the first basket 10 endpiece
g1, V
g2..., V
gndraw relation curve c, by the PV of the fluid of injection basket
nthe gas phase shunting volume V ' of corresponding the second basket 11 endpiece
g1, V '
g2..., V '
gndraw relation curve d;
(15) calculate the pressure differential Δ P at basket in parallel two ends
n, wherein Δ P
1=P
1-Ph ..., Δ P
n=P
n-Ph, n is more than or equal to 1, and binding time is put the PV of the fluid of corresponding injection basket
ndraw relation curve e.
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