CN109883894B - Ultrahigh-temperature ultrahigh-pressure steady-state gas-water permeability testing device and testing method - Google Patents
Ultrahigh-temperature ultrahigh-pressure steady-state gas-water permeability testing device and testing method Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 165
- 238000012360 testing method Methods 0.000 title claims abstract description 32
- 230000035699 permeability Effects 0.000 title claims description 51
- 239000007788 liquid Substances 0.000 claims abstract description 68
- 238000006243 chemical reaction Methods 0.000 claims abstract description 26
- 239000011435 rock Substances 0.000 claims abstract description 22
- 230000002572 peristaltic effect Effects 0.000 claims abstract description 14
- 230000008595 infiltration Effects 0.000 claims abstract description 12
- 238000001764 infiltration Methods 0.000 claims abstract description 12
- 238000010438 heat treatment Methods 0.000 claims abstract description 10
- 229920001971 elastomer Polymers 0.000 claims abstract description 9
- 238000001514 detection method Methods 0.000 claims abstract description 6
- 239000007789 gas Substances 0.000 claims description 67
- 238000000034 method Methods 0.000 claims description 44
- 239000012071 phase Substances 0.000 claims description 39
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 16
- 239000012530 fluid Substances 0.000 claims description 11
- 229920006395 saturated elastomer Polymers 0.000 claims description 11
- 238000002474 experimental method Methods 0.000 claims description 10
- 239000003345 natural gas Substances 0.000 claims description 8
- 230000000750 progressive effect Effects 0.000 claims description 7
- 238000002360 preparation method Methods 0.000 claims description 6
- 239000008346 aqueous phase Substances 0.000 claims description 4
- 230000015572 biosynthetic process Effects 0.000 claims description 4
- 230000001105 regulatory effect Effects 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 3
- 230000003068 static effect Effects 0.000 claims description 3
- 238000011049 filling Methods 0.000 claims description 2
- 238000005086 pumping Methods 0.000 claims 1
- 239000012808 vapor phase Substances 0.000 claims 1
- 230000003993 interaction Effects 0.000 abstract description 3
- 238000005259 measurement Methods 0.000 description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 238000009738 saturating Methods 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
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Abstract
The ultra-high temperature ultra-high pressure steady-state gas-water infiltration testing device comprises a core holder, wherein a rubber sleeve is arranged on the outer side of the core holder, a heating device is arranged on the outer side of the rubber sleeve, a confining pressure pump is connected with the core holder, four pipelines are respectively connected to the left side of the core holder through four joints, one pipeline is connected with a vacuum pump, the other pipeline is connected with a high-temperature high-pressure reaction kettle through a uniflow valve, and the high-temperature high-pressure reaction kettle is simultaneously connected with a constant-pressure pump; the third pipeline is connected to the right side of the core holder, and is sequentially provided with a peristaltic pump, a differential pressure transmitter, a gas-liquid ratio detection device, a liquid metering pipe and a valve from left to right, wherein the liquid metering pipe is also connected with a liquid metering pump. The device can accurately measure the steady-state gas-water infiltration of the water saturation of the rock core at ultrahigh temperature and ultrahigh pressure, and can consider the gas-water interaction.
Description
Technical Field
The invention belongs to the field of gas-water two-phase seepage of natural gas reservoirs, and particularly relates to an ultrahigh-temperature ultrahigh-pressure steady-state gas-water seepage testing device and method.
Background
The method for testing the gas-water permeation is divided into a steady state method and an unsteady state method. Because the unsteady state method has short measurement time, the unsteady state method is mostly used for testing at present, but the unsteady state method has the defects of flow lag, quick water output instant speed, easy missing, difficult accurate acquisition of water saturation and the like in the measurement process, and meanwhile, partial scholars adopt the unsteady state method to measure the gas-water infiltration under the high-temperature and high-pressure condition, but the high-temperature and high-pressure unsteady state method still adopts the normal-temperature and normal-pressure experimental flow and the treatment method, and the influence of mutual dissolution and the like of water and gas on the infiltration is not considered.
The steady state method is the most accurate gas-water permeation test method, and is determined under the condition of normal temperature and normal pressure in only a few tests due to long test time and less use.
In 2015, zhong Xiao et al have improved the flow on the basis of conventional gas-water infiltration tests, and used steady-state experiments on Berea sandstone, the gas flow rate at the inlet and outlet of a rock sample can be comprehensively calculated by using the injection or production speed of water and the pressure measured by the experiments. But the method is mainly based on the water vapor infiltration principle of an industry standard steady-state method, and the influence of the interaction of the air and the water on the infiltration treatment method is not considered. In 2017, zhang Yidan et al invented a device for measuring normal temperature and normal pressure gas-water permeation, which provides a displacement experimental device capable of conveniently and rapidly obtaining a correlation coefficient in the permeation process based on the idea that the weight change amount is converted into the change of saturation. However, in the experimental process, due to the small volume of the core, the displaced water quantity is limited, the water saturation is difficult to accurately measure by a weight sensor, and the anti-interference capability is poor.
In conclusion, the water saturation in the core is difficult to measure due to the interaction of the gas and water under the condition of ultrahigh temperature and high pressure, so that the application of the gas and water infiltration of a high-temperature and high-pressure steady-state method is restricted, and the experimental test of the gas and water infiltration of the steady-state method under the condition of ultrahigh temperature and high pressure is not seen up to the present.
Disclosure of Invention
The invention aims to provide an ultrahigh-temperature ultrahigh-pressure steady-state gas-water seepage test device and a test method, which can be used for performing a gas-water two-phase seepage test by adopting a steady-state method under the condition of ultrahigh temperature and high pressure.
The technical scheme adopted by the invention is as follows:
the ultra-high temperature ultra-high pressure steady-state gas-water infiltration testing device comprises a core holder, wherein a rubber sleeve is arranged on the outer side of the core holder, a heating device is arranged on the outer side of the rubber sleeve, a confining pressure pump is connected with the core holder, four pipelines are respectively connected to the left side of the core holder through four joints, one pipeline is connected with a vacuum pump, the other pipeline is connected with a high-temperature high-pressure reaction kettle through a uniflow valve, and the high-temperature high-pressure reaction kettle is simultaneously connected with a constant-pressure pump; the third pipeline is connected to the right side of the core holder, and is sequentially provided with a peristaltic pump, a differential pressure transmitter, a gas-liquid ratio detection device, a liquid metering pipe and a valve from left to right, wherein the liquid metering pipe is also connected with a liquid metering pump.
Further, the check valve and the constant pressure pump are connected through a circulation pipeline as shown in fig. 1 (when the water vapor at the upper layer in the high temperature and high pressure reaction kettle is required to be driven by the constant pressure pump, the valve A and the valve C are closed, the valve B and the valve D are opened, and when the water at the lower layer in the high temperature and high pressure reaction kettle is required to be driven, the valve B and the valve D are closed, and the valve A and the valve C are opened).
The method for testing by using the ultrahigh temperature and ultrahigh pressure steady-state gas-water permeability testing device comprises the following steps:
(1) Core preparation: the method comprises the steps of extracting, cleaning and drying a rock core, and measuring dry weight m1, diameter, length, gas measurement porosity and gas measurement permeability K;
(2) Fluid preparation: preparing a stratum water sample according to the stratum water data of the actual gas reservoir, selecting a natural gas sample of the actual gas reservoir, and measuring the viscosity of the prepared stratum water sample and the viscosity of the natural gas sample under the condition of simulating the original stratum temperature and pressure by using a viscosity meter respectively; adding water and gas under the formation temperature and pressure conditions into the high-temperature high-pressure reaction kettle 3, and fully mixing;
(3) The connection experiment flow comprises the following steps: connecting all flow parts of the testing device and ensuring qualified air tightness;
(4) Calibrating dead volume of an experiment flow: sequentially placing 4 standard blocks with different volumes in a core holder 5, vacuumizing, and calibrating a dead volume V0 in an experimental flow based on Boyle's law;
(5) Measuring gas phase permeability K at ultrahigh temperature and pressure G : filling a rock core 13 into a rock core holder 5, opening a confining pressure pump 7 to add confining pressure, opening a single-flow valve 4, adding internal pressure into the system by utilizing gas of fully saturated water vapor in a high-temperature high-pressure reaction kettle 3, and simultaneously, raising the temperature of the system to a set temperature by utilizing a heating device 8, wherein in the pressurizing process, the confining pressure and the internal pressure are continuously increased by adopting a progressive saturation method, and the confining pressure is always kept higher than the internal pressure by 3-5MPa until the confining pressure is added to the original overlying pressure and the internal pressure is added to the target fluid pressure; then, a peristaltic pump 15 is started, circulation is carried out under the set peristaltic pressure difference, and when the gas flow is stable, the gas permeability under the conditions of high temperature and high pressure is obtained by using the pressure difference and the flow at the moment;
(6) Calibrating the core bound water amount and the movable water amount: slowly releasing the internal pressure and the confining pressure in the step (5) until the internal pressure is normal pressure and the confining pressure is 3MPa; then the vacuum pump 1 is utilized to vacuumize to-0.1 Mpa, the check valve 4 is opened, and the connecting pipeline of the high-temperature high-pressure reaction kettle 3 and the check valve 4 is switched, so that the lower water can directly enter the system through the check valve 4, and then the reaction kettle is utilizedThe constant pressure pump 2 is used for saturating water into the rock core and the dead volume, and the saturated water quantity is V 1 The method comprises the steps of carrying out a first treatment on the surface of the The connecting pipelines at the two ends of the high-temperature high-pressure reaction kettle 3 are switched, so that the gas of the upper layer fully saturated water can directly enter the system through the check valve 4, and then the gas is used for driving water until no water is produced, at the moment, the increased water quantity in the liquid metering tube is the movable water quantity V in the core, and the bound water quantity is V 1 V, closing the check valve 4;
(7) Core again saturates water: releasing the system pressure to the normal pressure and the confining pressure of 3MPa according to the mode of the step (6), and adding the confining pressure to the original overlying pressure by adopting a progressive saturation method according to the step (5), wherein the internal pressure is added to the target fluid pressure;
(8) Determination of effective permeability of gas phase and effective permeability of water phase at different water saturation
After the liquid level of the liquid metering pipe 10 is regulated by opening the liquid metering pump 9 and is leveled with the liquid inlet pipe, opening the check valve 4, keeping the gas of saturated water vapor to be the same as the pressure of the core system, then opening the liquid metering pump 9, slowly regulating the liquid level in the liquid metering pipe 10 to drop by one tenth, and after the pressure is stable, closing the check valve 4; the peristaltic pump 15 is started to circulate until the gas-water ratio is stable, then the gas phase effective permeability and the water phase effective permeability at the moment are calculated according to the pressure difference of the ultra-high static pressure differential pressure transmitter 14 and the gas water flow at the moment, and the water saturation in the rock core is calculated according to the gas-liquid ratio and the dead volume; then adopting the same method to slowly adjust the liquid level in the liquid metering tube to drop by one tenth, measuring the gas phase effective permeability and the water phase effective permeability when the second water saturation, and so on until the movable water is completely removed;
(9) Calculating and drawing a gas-water permeability curve by a steady-state method
By using the experimental results and combining the following models, S under different saturation degrees is obtained by calculation w Is a gas-water relative permeability curve:
wherein: mu (mu) W Viscosity in mPa.s of the water for experiments;
l-core length in cm;
a-core cross-sectional area in cm 2 ；
Q w Flow rate of water, unit mL/s;
Δp—differential pressure across inlet and outlet, in MPa
GWR, gas-water ratio; dimensionless
ρ w Density of water in g/cm 3 ；
S w -water saturation;
wherein: q (Q) w 、Q g Flow rate of water phase and gas phase, unit mL/s;
q is the total flow of gas and liquid, unit mL/s;
V 3 、V 2 gas-water volume in cm by gas-liquid ratio 3 ；
K rw 、K rg Relative permeability of aqueous phase and gas phase, unit mD.
The invention has the beneficial effects that:
the testing device provided by the invention can accurately measure the gas-water steady state method phase permeability under the ultra-high temperature and ultra-high pressure condition, the testing method is based on the infinite gas-water circulation steady flow principle, and the gas-water intersolubility under the ultra-high temperature and high pressure condition is considered, so that the different water saturation in the rock core can be accurately controlled, the gas-water steady circulation gas-liquid ratio can be accurately monitored, the device can resist the temperature of 200 ℃ and 100MPa, and the gas-water steady state phase permeability curve measurement requirement under the ultra-high temperature and high pressure gas reservoir condition can be met.
The pressure sensor used in the testing device can bear ultrahigh pressure and can accurately detect small pressure difference at two ends, and the liquid metering tube can ensure accurate measurement of water displacement from the rock core under the ultrahigh temperature and ultrahigh pressure condition based on the capacitance principle, and based on the accurate measurement result is obtained.
Drawings
Figure 1 is a schematic diagram of the overall structure of the testing device of the present invention,
in the figure: 1. the device comprises a vacuum pump, 2, a constant pressure pump, 3, a high-temperature high-pressure reaction kettle, 4, a uniflow valve, 5, a core holder, 6, a rubber sleeve, 7, a surrounding pressure pump, 8, a heating device, 9, a liquid metering pump, 10, a liquid metering pipe, 11, a valve, 12, a gas-liquid ratio detection device, 13, a core, 14, a differential pressure transmitter, 15, a peristaltic pump, 16 and a four-way valve.
Detailed Description
The ultra-high temperature ultra-high pressure steady-state gas-water infiltration testing device comprises a core holder 5, a heating device 8 and a confining pressure pump 7, wherein the outer side of the core holder 5 is provided with a rubber sleeve 6, the outer side of the rubber sleeve 6 is provided with a heating device 8, the heating device is connected with a confining pressure pump 7, the left side of the core holder 5 is respectively connected with four pipelines through four ways, one pipeline is connected with a vacuum pump 1, the other pipeline is connected with a high-temperature high-pressure reaction kettle 3 through a uniflow valve 4, the high-temperature high-pressure reaction kettle 3 is simultaneously connected with a constant pressure pump 2, the uniflow valve 4 and the constant pressure pump 2 are connected through a circulation pipeline as shown in figure 1 (when water vapor at the upper layer in the high-temperature high-pressure reaction kettle is required to be driven through the constant pressure pump, the valve A and the valve C are closed, and the valve B and the valve D are opened when water at the lower layer in the high-temperature high-pressure reaction kettle is required to be driven; a third pipeline is connected to the right side of the core holder 5, and a peristaltic pump 15, a differential pressure transmitter 14, a gas-liquid ratio detection device 12, a liquid metering pipe 10 and a valve 11 are sequentially arranged on the pipeline from left to right, wherein the liquid metering pipe 10 is also connected with a liquid metering pump 9.
The method for testing by using the ultrahigh temperature and ultrahigh pressure steady-state gas-water permeability testing device comprises the following steps:
(1) Core preparation: the dry weight m1, diameter, length, gas porosity and gas permeability K (permeability measured by formation pressure at normal temperature) were measured after extraction, cleaning and drying of the selected core, and the specific results are shown in Table 1:
(2) Fluid preparation: preparing a stratum water sample according to the stratum water data of the actual gas reservoir, selecting a natural gas sample of the actual gas reservoir, and measuring the viscosity of the prepared stratum water sample and the viscosity of the natural gas sample under the condition of simulating the original stratum temperature and pressure by using a viscosity meter respectively (see table 1); adding 500mL of water and 600mL of gas under the formation temperature and pressure condition into the high-temperature high-pressure reaction kettle 3, and fully mixing (after stabilization, the lower layer is water, and the upper layer is a gas-water mixture);
table 1 core and fluid performance parameters
(3) The connection experiment flow comprises the following steps: connecting all flow parts of the testing device and ensuring qualified air tightness;
(4) Calibrating dead volume of an experiment flow: sequentially placing 3 standard blocks with the volumes of 3.55cm in a core holder 5 3 、1.17cm 3 、1.17cm 3 Vacuumizing, and calibrating a dead volume V0 in the experimental flow based on Boyle's law; (A hollow iron sleeve with a certain thickness is arranged outside the standard block, the volume of the iron sleeve occupies 50% of the volume of the whole standard block, the volume of the hollow part occupies 50%, a standard block with a fixed volume is placed in each time, the relation image of the residual unoccupied volume and the system pressure in balance is determined, p2= (p 1/v 2) v1, and the pipeline volume can be calculated by using the slope and p 1.)
Calculated, the dead volume v0= 1.767m 3 ；
(5) Measuring gas phase permeability K at ultrahigh temperature and pressure G : the core 13 is put into the core holder 5, the confining pressure pump 7 is opened to add confining pressure, the single flow valve 4 is opened, internal pressure is added into the system by utilizing the gas of fully saturated water vapor in the high-temperature high-pressure reaction kettle 3 (the gas of fully saturated water vapor is used, the situation of high-temperature high-pressure water mutual solubility is considered), meanwhile, the temperature of the system is raised to 100 ℃ by utilizing the heating device 8, the confining pressure and the internal pressure are continuously increased by adopting a progressive saturation method in the pressurizing process, and the confining pressure is always kept to be higher than the internal pressure by 3-5MPa until the confining pressure is added to the original overlaying pressure of 100MPa, and the internal pressure is added to the target fluid pressure of 45MPa; then, the peristaltic pump 15 is opened, circulation is carried out under the set peristaltic pressure difference of 0.3MPa, and when the gas flow is stable, the pressure difference and the flow are used for obtaining the gas measurement permeability K under the conditions of high temperature and high pressure G ＝310mD；
(6) Calibrating the core bound water amount and the movable water amount: slowly releasing the internal pressure and the confining pressure in the step 5 until the internal pressure is normal pressure (pressure release through a valve 11) and the confining pressure is 3MPa (through a valve connected with a confining pressure pump); then the vacuum pump 1 is utilized to vacuumize to-0.1 Mpa, the check valve 4 is opened, and the connecting pipeline of the high-temperature high-pressure reaction kettle 3 and the check valve 4 is switched (the valve B and the valve D are closed, the valve A and the valve C are opened), so that the lower water (used for saturating the rock core and dead volume and saturated with natural gas in the water) can directly pass through the check valveValve 4 is entered into the system and then the confining pressure is increased to the original overburden pressure by the lower water by the progressive saturation method of saturating the core and dead volume with constant pressure pump 2 (according to step 5) and the internal pressure is increased to the target fluid pressure) with a saturated water volume V 1 = 5.956mL; switching connecting pipelines at two ends of a high-temperature high-pressure reaction kettle 3 (closing a valve A and a valve C, opening a valve B and a valve D) so that gas of upper layer fully saturated water can directly enter a system through a check valve 4 and further is used for driving water until no water is produced, at the moment, a liquid metering tube (a two-layer structure, an outer layer is a metal shell and is used for resisting high temperature and high pressure, a vertical tube with a resistor and scales is arranged inside to accurately measure the water quantity entering the liquid metering tube, the liquid metering tube is based on a capacitance principle, the accurate measurement of the water quantity displaced from a rock core can be ensured), the water quantity added in the liquid metering tube is the movable water quantity V=4.16 mL in the rock core, and the bound water quantity is V 1 V=1.51 mL, closing the check valve 4;
(7) Core again saturates water: releasing the system pressure to the internal pressure of normal pressure and the confining pressure of 3MPa in the mode of the step 6), and adopting a progressive saturation method to increase the confining pressure to the original overburden pressure in the step 5), wherein the internal pressure is increased to the target fluid pressure (the uniflow valve 4 is opened) to saturate stratum water of saturated gas at the same temperature and pressure into the rock core;
(8) Determination of effective permeability of gas phase and effective permeability of water phase at different water saturation
Opening a liquid metering pump 9 to adjust the liquid level of a liquid metering tube 10 to be level with a liquid inlet tube (a longer pipeline extending into a liquid metering device in fig. 1) (if the liquid metering tube is not level, when a gas-liquid mixed phase comes out of a rock core, the liquid metering tube enters the metering tube and cannot flow all along the pipeline to form a circulating system, through the level setting, steady-state circulation is ensured), opening a uniflow valve 4 to keep the pressure of saturated steam gas to be the same as that of the rock core system, then opening the liquid metering pump 9, slowly adjusting the liquid level in the liquid metering tube 10 to be reduced by one tenth (the movable water volume V of the whole system is reduced by one tenth), and closing the uniflow valve 4 after the pressure is stable; the peristaltic pump 15 is started to circulate until the gas-water ratio is stable, then the gas phase effective permeability and the water phase effective permeability at the moment are calculated according to the pressure difference of the ultra-high static pressure differential pressure transmitter 14 and the gas water flow at the moment, and the water saturation in the rock is calculated according to the gas-liquid ratio (obtained by the gas-liquid ratio detection device 12) and the dead volume; then adopting the same method to slowly adjust the liquid level in the liquid metering tube to drop by one tenth, measuring the gas phase effective permeability and the water phase effective permeability when the second water saturation, and so on until the movable water is completely removed;
(9) Calculating and drawing a gas-water permeability curve by a steady-state method
By using the experimental results and combining the following models, S under different saturation degrees is obtained by calculation w Is a gas-water relative permeability curve:
wherein: mu (mu) W Viscosity in mPa.s of the water for experiments;
l-core length in cm;
a-core cross-sectional area in cm 2 ；
Q w Flow rate of water, unit mL/s;
Δp—differential pressure across inlet and outlet, in MPa
GWR, gas-water ratio; dimensionless
ρ w Density of water in g/cm 3 ；
S w -water saturation;
wherein: q (Q) w 、Q g Flow rate of water phase and gas phase, unit mL/s;
q is the total flow of gas and liquid, unit mL/s;
V 3 、V 2 gas-water volume in cm by gas-liquid ratio 3 ；
K rw 、K rg Relative permeability of aqueous phase and gas phase, unit mD.
The effective permeability of the gas phase and the effective permeability of the water phase at different water saturation levels are obtained as shown in Table 2.
TABLE 2 effective permeability of gas phase and effective permeability of water phase at various water saturation
Claims (2)
1. The method for testing the ultrahigh-temperature ultrahigh-pressure steady-state gas-water permeability testing device is characterized by comprising the following steps of:
step one, core preparation: the dry weight m is measured after the core is extracted, cleaned and dried 1 Diameter, length, gas cell porosity and gas permeability K;
step two, fluid preparation: preparing a stratum water sample according to the stratum water data of the actual gas reservoir, selecting a natural gas sample of the actual gas reservoir, and measuring the viscosity of the prepared stratum water sample and the viscosity of the natural gas sample under the condition of simulating the original stratum temperature and pressure by using a viscosity meter respectively; adding water and gas under the formation temperature and pressure conditions into a high-temperature high-pressure reaction kettle (3) for fully mixing;
step three, connecting an experimental flow: connecting all flow parts of the testing device and ensuring qualified air tightness;
step four, calibrating dead volume of an experiment flow: sequentially placing 4 standard blocks with different volumes into a core holder (5), vacuumizing, and calibrating a dead volume V in an experimental flow based on Boyle's law 0 ；
Step five, measuring the gas phase permeability K at the ultrahigh temperature and the ultrahigh pressure G : filling a rock core (13) into a rock core holder (5), opening a confining pressure pump (7) to add confining pressure and opening a single-flow valve (4), adding internal pressure into the system by utilizing gas of fully saturated water vapor in a high-temperature high-pressure reaction kettle (3), and simultaneously, raising the temperature of the system to a set temperature by utilizing a heating device (8), wherein in the pressurizing process, the confining pressure and the internal pressure are continuously increased by adopting a progressive saturation method, and the confining pressure is always kept higher than the internal pressure by 3-5MPa until the confining pressure is added to the original overlying pressure and the internal pressure is added to the target fluid pressure; then, a peristaltic pump (15) is started, circulation is carried out under the set peristaltic pressure difference, and when the gas flow is stable, the gas permeability under the conditions of high temperature and high pressure is obtained by using the pressure difference and the flow at the moment;
step six, calibrating the bound water quantity and the movable water quantity of the core: slowly releasing the internal pressure and the confining pressure in the fifth step until the internal pressure is normal pressure and the confining pressure is 3MPa; then vacuum pumping is carried out to 0.1Mpa by using a vacuum pump (1), a check valve (4) is opened, and a connecting pipeline of the high-temperature high-pressure reaction kettle (3) and the check valve (4) is switched, so that lower water can directly enter a system through the check valve (4), and then water is saturated in a rock core and a dead volume by using a constant pressure pump (2), wherein the saturated water amount is V 1 The method comprises the steps of carrying out a first treatment on the surface of the RotationThe connecting pipelines at the two ends of the high-temperature high-pressure reaction kettle (3) are exchanged, so that the gas of the upper layer fully saturated water can directly enter the system through the check valve (4), the gas is used for driving water until no water is produced, at the moment, the increased water quantity in the liquid metering tube is the movable water quantity V in the core, and the bound water quantity is V 1 -V, closing the check valve (4);
step seven, the core is saturated with water again: releasing the system pressure to the normal pressure and the confining pressure of 3MPa according to the mode of the step six, and adding the confining pressure to the original overlying pressure by adopting a progressive saturation method according to the step five, wherein the internal pressure is added to the target fluid pressure;
step eight, measuring the effective gas phase permeability and the effective water phase permeability under different water saturation
After the liquid level of the liquid metering pipe (10) is regulated by opening the liquid metering pump (9) and is leveled with the liquid inlet pipe, opening the check valve (4), keeping the gas of saturated water vapor to be the same as the pressure of the core system, then opening the liquid metering pump (9), slowly regulating the liquid level in the liquid metering pipe (10) to drop by one tenth, and after the pressure is stable, closing the check valve (4); a peristaltic pump (15) is started to circulate until the gas-water ratio is stable, then the gas phase effective permeability and the water phase effective permeability at the moment are calculated according to the pressure difference of an ultra-high static pressure differential pressure transmitter (14) and the gas water flow at the moment, and the water saturation in the rock core is calculated according to the gas-liquid ratio and the dead volume; then adopting the same method to slowly adjust the liquid level in the liquid metering tube to drop by one tenth, measuring the gas phase effective permeability and the water phase effective permeability when the second water saturation, and so on until the movable water is completely removed;
step nine: calculating and drawing a gas-water permeability curve by a steady-state method
By using the experimental results and combining the following models, S under different saturation degrees is obtained by calculation w Is a gas-water relative permeability curve:
wherein: mu (mu) W Viscosity in mPa.s of the water for experiments;
l-core length in cm;
a-core cross-sectional area in cm 2 ；
Q w Flow rate of water, unit mL/s;
Δp—differential pressure across inlet and outlet, in MPa
GWR, gas-water ratio, dimensionless;
ρ w density of water in g/cm 3 ；
S w -water saturation;
wherein: q (Q) w 、Q g Flow rate of water phase and gas phase, unit mL/s;
q is the total flow of gas and liquid, unit mL/s;
V 3 、V 2 gas-water volume in cm by gas-liquid ratio 3 ；
K rw 、K rg -relative permeability of aqueous phase, vapor phase, unit mD;
P 1 -rock sample inlet pressure, MPa;
P 2 -rock sample outlet pressure, MPa;
K w -effective permeability of the aqueous phase, mD;
K g -effective permeability of the gas phase, mD;
P a atmospheric pressure, MPa;
mu, and g -gas viscosity, mpa·s;
the ultrahigh-temperature ultrahigh-pressure steady-state gas-water infiltration testing device comprises a core holder (5) with a rubber sleeve (6) arranged on the outer side, a heating device (8) arranged on the outer side of the rubber sleeve (6) and connected with a confining pressure pump (7), four pipelines are respectively connected to the left side of the core holder (5) through four joints, one pipeline is connected with a vacuum pump (1), the other pipeline is connected with a high-temperature high-pressure reaction kettle (3) through a check valve (4), and the high-temperature high-pressure reaction kettle (3) is simultaneously connected with a constant-pressure pump (2); the third pipeline is connected to the right side of the core holder (5), and is provided with a peristaltic pump (15), a differential pressure transmitter (14), a gas-liquid ratio detection device (12), a liquid metering pipe (10) and a valve (11) in sequence from left to right, wherein the liquid metering pipe (10) is also connected with a liquid metering pump (9).
2. The method for testing the ultrahigh-temperature ultrahigh-pressure steady-state gas-water permeability testing device according to claim 1, wherein the connection between the check valve (4) and the constant-pressure pump (2) is realized through a circulation pipeline.
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