CN210037534U - Ultra-high temperature and ultra-high pressure steady-state gas-water phase seepage testing device - Google Patents
Ultra-high temperature and ultra-high pressure steady-state gas-water phase seepage testing device Download PDFInfo
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- CN210037534U CN210037534U CN201920420100.8U CN201920420100U CN210037534U CN 210037534 U CN210037534 U CN 210037534U CN 201920420100 U CN201920420100 U CN 201920420100U CN 210037534 U CN210037534 U CN 210037534U
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Abstract
The ultra-high temperature and ultra-high pressure steady gas-water phase seepage testing device comprises a rock core holder, wherein a rubber sleeve is arranged on the outer side of the rock core holder, a heating device is arranged on the outer side of the rubber sleeve and is connected with a confining pressure pump, the left side of the rock core holder is respectively connected with four pipelines through a four-way joint, one of the pipelines is connected with a vacuum pump, the other pipeline is connected with a high-temperature high-pressure reaction kettle through a check valve, and the high-temperature high; the third pipeline is connected to the right side of the rock core holder, a peristaltic pump, a differential pressure transmitter, a gas-liquid ratio detection device, a liquid metering pipe and a valve are sequentially arranged on the pipeline from left to right, and the liquid metering pipe is further connected with a liquid metering pump. The device can be used for accurately measuring the steady gas-water phase permeability of the water saturation of the rock core under ultrahigh temperature and ultrahigh pressure, and the gas-water mutual solubility can be considered.
Description
Technical Field
The utility model belongs to the gas-water two-phase seepage field of natural gas reservoir, concretely relates to ultra-high temperature superhigh pressure stable state gas water phase oozes testing arrangement.
Background
The gas-water phase permeation test method is divided into a steady-state method and an unsteady-state method. The unsteady state method has short measurement time, so the unsteady state method is mostly used for testing at present, but the unsteady state method has the defects of flow lag, high water outlet instant water speed, easy missing, difficult accurate acquisition of water saturation and the like in the measurement process, meanwhile, part of scholars adopt the unsteady state method to measure gas-water phase permeability under the conditions of high temperature and high pressure, but the high temperature and high pressure unsteady state method adopts a normal temperature and normal pressure experimental flow and a treatment method, and the influence of mutual dissolution of water and gas and the like on the phase permeability is not considered.
The steady state method is the most accurate gas-water phase permeability test method which is acknowledged, and because the test time is long and the test method is less used, the test method can be used for testing under the conditions of normal temperature and normal pressure in only a few tests.
In 2015, dawn et al performed flow improvement on the basis of conventional gas-water permeability test, and performed gas-water permeability test on Berea sandstone by using a steady state method, and the gas flow rate at the rock sample inlet and outlet can be comprehensively calculated by using the injection or production rate of water according to the temperature of gas and the pressure measured by the test. However, the method is mainly used for determination based on the industry standard steady-state method water-gas phase permeation principle, and the influence of the interaction of the water and the gas on the phase permeation treatment method is not considered. In 2017, Zhang Yidan et al utility model a measure device that normal atmospheric temperature atmospheric pressure aqueous phase oozes, the device turns into the thinking of the change of saturation based on weight variation, provides one kind and can conveniently and obtain correlation coefficient's displacement experimental apparatus fast in the process of oozing mutually. However, in the experimental process, because the volume of the rock core is small, the displaced water volume is limited, the weight sensor is difficult to accurately measure the water saturation, and the anti-interference capability is poor.
In conclusion, the water saturation in the rock core is difficult to determine due to the interaction of gas and water under the conditions of ultra-high temperature and high pressure, the application of gas and water permeation of a high-temperature and high-pressure steady-state method is restricted, and no experimental test of gas and water permeation of a steady-state method under the conditions of ultra-high temperature and high pressure is seen at present.
Disclosure of Invention
The utility model aims at providing an ultra-high temperature superhigh pressure steady state gas water phase oozes testing arrangement can adopt the steady state method to carry out the double-phase seepage flow test of gas water under ultra-high temperature high pressure condition.
The utility model adopts the technical proposal that:
the ultra-high temperature and ultra-high pressure steady gas-water phase seepage testing device comprises a rock core holder, wherein a rubber sleeve is arranged on the outer side of the rock core holder, a heating device is arranged on the outer side of the rubber sleeve and is connected with a confining pressure pump, the left side of the rock core holder is respectively connected with four pipelines through a four-way joint, one of the pipelines is connected with a vacuum pump, the other pipeline is connected with a high-temperature high-pressure reaction kettle through a check valve, and the high-temperature high; the third pipeline is connected to the right side of the rock core holder, a peristaltic pump, a differential pressure transmitter, a gas-liquid ratio detection device, a liquid metering pipe and a valve are sequentially arranged on the pipeline from left to right, and the liquid metering pipe is further 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 constant pressure pump is required to drive the water vapor in the upper layer of the high-temperature high-pressure reaction kettle, the valve A and the valve C are closed, the valve B and the valve D are opened, and when the constant pressure pump is required to drive the water in the lower layer of the high-temperature high-pressure reaction kettle, the valve B and the valve D are closed, and the valve A and the valve C are opened).
The utility model has the advantages that:
the utility model provides a testing arrangement can carry out the air water steady state method under the ultra-high temperature superhigh pressure condition of accurate measurement and ooze mutually, and the test is based on unlimited air water circulation steady flow principle, considers the air water mutual effect under the ultra-high temperature high pressure condition, but different water saturation in the accurate control core, accurate monitoring air water steady circulation air-liquid ratio, device can be able to bear the temperature 200 ℃, 100MPa, can satisfy the air water steady state under the ultra-high temperature high-pressure gas reservoir condition and ooze the curve measurement needs mutually.
The pressure sensor used in the testing device can bear ultrahigh pressure and can also accurately detect very small pressure difference at two ends, and the liquid metering tube can ensure accurate measurement of the displacement water yield of the rock core under the conditions of ultrahigh temperature and ultrahigh pressure based on the capacitance principle, so that an accurate measuring result is obtained.
Drawings
FIG. 1 is a schematic view 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 check valve, 5, a core holder, 6, a rubber sleeve, 7, a confining 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 cross joint.
Detailed Description
A steady gas-water phase seepage testing device for ultrahigh temperature and ultrahigh pressure comprises a core holder 5 with a rubber sleeve 6 on the outer side, a heating device 8 is arranged on the outer side of the rubber sleeve 6 and is connected with a confining pressure pump 7, the left side of the core holder 5 is respectively connected with four pipelines through a four-way joint, one of the pipelines is connected with a vacuum pump 1, the other pipeline is connected with a high temperature and high pressure reaction kettle 3 through a check valve 4, the high temperature and high pressure reaction kettle 3 is simultaneously connected with a constant pressure pump 2, and the circulating pipeline is connected between the check valve 4 and the constant pressure pump 2 as shown in figure 1 (when water vapor on the upper layer in the high temperature and high pressure reaction kettle needs to be driven through the constant pressure pump, a valve A and a valve C are closed, and when water on the lower layer in the high temperature and high pressure reaction kettle needs to be driven, the valve; the third pipeline is connected to the right side of the core holder 5, 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 further connected with a liquid metering pump 9.
The method for testing by using the ultrahigh-temperature ultrahigh-pressure steady-state gas-water phase permeation testing device comprises the following steps of:
(1) preparing a core: the selected core was extracted, cleaned, dried and then measured for dry weight m1, diameter, length, gas porosity, and gas permeability K (permeability measured at room temperature using formation pressure), with the specific results shown in table 1:
(2) fluid preparation: preparing a stratum water sample according to the data of the stratum water of the actual gas reservoir, selecting a natural gas sample of the actual gas reservoir, and respectively measuring the viscosities of the prepared stratum water sample and the natural gas sample under the simulated original stratum temperature and pressure by using a viscometer (see table 1); adding 500mL of water and 600mL of gas under the condition of formation temperature and pressure into a high-temperature high-pressure reaction kettle 3 for 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) Connection experiment process: connecting each process part of the testing device and ensuring that the air tightness is qualified;
(4) calibrating dead volume of experimental process: 3 standard blocks with the volume of 3.55cm are sequentially put into the core holder 53、1.17cm3、1.17cm3Vacuumizing, and calibrating a dead volume V0 in the experimental process based on Boyle's law; (the outside of the standard block is a hollow iron sleeve with a certain thickness, the volume of the iron sleeve occupies 50% of the volume of the whole standard block, the volume of the hollow part occupies 50%, each time a standard block with a fixed volume is placed, the relation image of the residual unoccupied volume and the system pressure at the equilibrium is determined, and the pipeline volume can be obtained by using the slope and p 1.) when the p2 is (p1/v2) v 1)
Calculated, the dead volume V0 is 1.767m3；
(5) Measuring gas phase permeability K under ultrahigh temperature and ultrahigh pressureG: the rock core 13 is filled into the rock core holder 5, the confining pressure pump 7 is opened to pressurize, the check valve 4 is opened, the gas of fully saturated steam inside the high-temperature high-pressure reaction kettle 3 (the gas of fully saturated steam is used, the method can be more practical, the high-temperature high-pressure steam-water mutual solubility condition is considered) is utilized to pressurize the system (the valve A and the valve C are closed, the valve B and the valve D are opened), meanwhile, the system temperature is increased to 100 ℃ by utilizing the heating device 8, the confining pressure and the internal pressure are continuously increased by adopting a step-by-step saturation method in the pressurizing process, and the confining pressure is always kept higher than the confining pressureThe internal pressure is 3-5MPa until the confining pressure is increased to the original overlying pressure of 100MPa and the internal pressure is increased to the target fluid pressure of 45 MPa; then, the peristaltic pump 15 is opened, circulation is carried out under the set peristaltic pressure difference of 0.3MPa, when the gas flow is stable, the gas permeability K under the high-temperature and high-pressure condition is obtained by using the pressure difference and the flow at the momentG＝310mD；
(6) Calibrating the bound water volume and the movable water volume of the rock core: slowly releasing the internal pressure and the confining pressure in the step 5 to the conditions that the internal pressure is normal pressure (pressure is released through a valve 11) and the confining pressure is 3MPa (through a valve connected with a confining pressure pump); then, a vacuum pump 1 is used for vacuumizing to-0.1 Mpa, a check valve 4 is opened, a connecting pipeline between a high-temperature high-pressure reaction kettle 3 and the check valve 4 is converted (a valve B and a valve D are closed, a valve A and a valve C are opened), so that lower-layer water (used for saturating rock cores and dead volumes, and the water is saturated with natural gas) can directly enter a system through the check valve 4, then a constant pressure pump 2 is used for adding confining pressure to original overlying pressure and adding internal pressure to target fluid pressure to saturated water (according to a step-by-step saturation method adopted in the step 5) in the rock cores and the dead volumes, the lower-layer water is used for adding confining pressure to original overlying pressure, and15.956 mL; conversion high temperature high pressure reation kettle 3 the connecting tube way at both ends (close valve A and valve C, open valve B and valve D), make the gas of the abundant saturated water in upper strata can be directly through 4 entering systems of single current valve, and then produce until anhydrous with this gas flooding, liquid metering tube (two-layer structure this moment, the outer metal casing is used for high temperature resistant high pressure, inside is the water yield that the standpipe that has resistance and scale comes the accurate measurement entering, this liquid metering tube is based on the electric capacity principle, can guarantee to follow the accurate measurement of rock core displacement water yield) in the increase water yield be 4.16mL for movable water yield V in the rock core promptly, the constraint water yield is V1-V ═ 1.51mL, check valve 4 was closed;
(7) the core was again saturated with water: releasing the system pressure to the state that the internal pressure is normal pressure and the confining pressure is 3MPa according to the mode of the step 6), adding the confining pressure to the original overlying pressure by adopting a step-by-step saturation method according to the step 5), and adding the internal pressure to the target fluid pressure (opening a check valve 4) to saturate formation water of saturated gas in the rock core under the same temperature and pressure);
(8) determination of effective gas/water permeability at different water saturation
Opening the liquid metering pump 9 to adjust the liquid level height of the liquid metering pipe 10 to be equal to that of a liquid inlet pipe (a longer pipeline extending into the liquid metering device in fig. 1) (if the liquid level height is not equal, when gas-liquid mixed phase comes out of a rock core, the gas-liquid mixed phase enters the metering pipe and cannot flow along the pipeline to form a circulating system, and steady-state circulation is ensured by the parallel arrangement), then opening the check valve 4 to keep the pressure of gas of saturated steam to be equal to that of the rock core system, then opening the liquid metering pump 9 again, slowly adjusting the liquid level height in the liquid metering pipe 10 to be reduced by one tenth (the movable water volume V of the whole system is reduced by one tenth), and after the pressure is stable, closing the check; opening a peristaltic pump 15 for circulation until the gas-water ratio is stable, then calculating the effective gas-phase permeability and the effective water-phase permeability at the moment according to the differential pressure of the ultrahigh static pressure differential pressure transmitter 14 and the gas-water flow at the moment, and calculating the water saturation in the rock core according to the gas-liquid ratio (obtained by the gas-liquid ratio detection device 12) and the dead volume; then, slowly adjusting the liquid level height in the liquid metering pipe to drop by one tenth by the same method, and measuring the effective permeability of the gas phase and the effective permeability of the water phase when the second water saturation degree is reached, and so on until the movable water is removed;
(9) calculating and drawing gas-water phase permeability curve of steady state method
The S under different saturation degrees is obtained by using the experimental result and combining the following model calculationwThe gas-water relative permeability curve is as follows:
in the formula: mu.sWViscosity of the test water in mPas units;
l is the core length in cm;
a-core Cross-sectional area, in cm2；
Qw-flow rate of water, in mL/s;
Δ p-pressure difference between inlet and outlet ends, unit MPa
GWR-gas-water ratio; dimensionless
ρwDensity of water in g/cm3；
Sw-the water saturation;
in the formula: qw、Qg-flow of aqueous phase, gas phase, in mL/s;
q is the total flow of gas and liquid, unit mL/s;
V3、V2determining the volume of gas and water in cm by using the gas-liquid ratio3；
Krw、KrgRelative permeability of the aqueous and gas phases in mD.
The gas phase effective permeability and the water phase effective permeability at different water saturations obtained are shown in table 2.
TABLE 2 effective gas phase Permeability and effective Water phase Permeability at different Water saturations
Claims (2)
1. The ultra-high temperature and ultra-high pressure steady gas-water phase seepage testing device is characterized by comprising a core holder (5) with a rubber sleeve (6) arranged on the outer side, wherein a heating device (8) is arranged on the outer side of the rubber sleeve (6) and is connected with a confining pressure pump (7), four pipelines are respectively connected to the left side of the core holder (5) through a four-way joint, 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; the third pipeline is connected to the right side of the rock core holder (5), 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, and the liquid metering pipe (10) is further connected with a liquid metering pump (9).
2. The steady-state gas-water phase permeation testing device at ultrahigh temperature and ultrahigh pressure as claimed in claim 1, wherein a circulating pipeline is connected between the check valve (4) and the constant pressure pump (2).
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109883894A (en) * | 2019-03-29 | 2019-06-14 | 西南石油大学 | A kind of superhigh temperature super-pressure stable state air water mutually seeps test device and test method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109883894A (en) * | 2019-03-29 | 2019-06-14 | 西南石油大学 | A kind of superhigh temperature super-pressure stable state air water mutually seeps test device and test method |
| CN109883894B (en) * | 2019-03-29 | 2024-03-26 | 西南石油大学 | Ultrahigh-temperature ultrahigh-pressure steady-state gas-water permeability testing device and testing method |
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