CN112798494A - Long core drying seepage experiment device and experiment method - Google Patents
Long core drying seepage experiment device and experiment method Download PDFInfo
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- CN112798494A CN112798494A CN202110136743.1A CN202110136743A CN112798494A CN 112798494 A CN112798494 A CN 112798494A CN 202110136743 A CN202110136743 A CN 202110136743A CN 112798494 A CN112798494 A CN 112798494A
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- 238000002474 experimental method Methods 0.000 title claims abstract description 38
- 238000001035 drying Methods 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000003756 stirring Methods 0.000 claims abstract description 40
- 239000002274 desiccant Substances 0.000 claims abstract description 29
- 238000001514 detection method Methods 0.000 claims abstract description 18
- 238000002156 mixing Methods 0.000 claims abstract description 15
- 230000035699 permeability Effects 0.000 claims abstract description 15
- 238000006073 displacement reaction Methods 0.000 claims abstract description 10
- 239000011435 rock Substances 0.000 claims description 78
- 239000007789 gas Substances 0.000 claims description 39
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 31
- 229910052757 nitrogen Inorganic materials 0.000 claims description 16
- 238000006243 chemical reaction Methods 0.000 claims description 11
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 10
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 10
- 230000007246 mechanism Effects 0.000 claims description 7
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 5
- 239000001569 carbon dioxide Substances 0.000 claims description 5
- 230000008859 change Effects 0.000 claims description 5
- 239000002244 precipitate Substances 0.000 claims description 5
- 238000004140 cleaning Methods 0.000 claims description 4
- 239000008398 formation water Substances 0.000 claims description 4
- 239000011521 glass Substances 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 4
- 238000011068 loading method Methods 0.000 claims description 4
- 238000012544 monitoring process Methods 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims description 3
- 238000009738 saturating Methods 0.000 claims description 3
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- 238000012216 screening Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
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- 238000010276 construction Methods 0.000 description 1
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- 238000010586 diagram Methods 0.000 description 1
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- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen(.) Chemical compound [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/082—Investigating permeability by forcing a fluid through a sample
- G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/0806—Details, e.g. sample holders, mounting samples for testing
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
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Abstract
The invention discloses a long core drying seepage experiment device and an experiment method, and belongs to the technical field of oil and gas field development. The core holder of the experimental device is provided with a plurality of detection interfaces along the way; the stirring rod is positioned in the stirring cylinder, and the motor is arranged outside the stirring cylinder; the double-cylinder constant-speed constant-pressure pump and the first piston container are connected with the mixing drum through a first connecting pipeline, the double-cylinder constant-speed constant-pressure pump, the second piston container and the third piston container are connected with the inlet end through a second connecting pipeline, the double-cylinder constant-speed constant-pressure pump and the fourth piston container are connected with the outlet end through a third connecting pipeline, the back pressure valve is connected with the outlet end and the booster pump, and the long core holder, the first piston container and the second piston container are located in the constant-temperature oven; the invention also discloses an experimental method, the experimental device can prevent the precipitation of the drying agent system, and accurately determine the invasion depth of the drying agent through multi-point measurement; the drying effect of the drying agent is accurately reflected by measuring the permeability of the core before and after the invasion or displacement of the drying agent.
Description
Technical Field
The invention relates to the technical field of oil and gas field development, in particular to a long core drying seepage experiment device and an experiment method.
Background
As the compact reservoir has the characteristics of small pore throat radius, high primary water saturation, natural fracture development and the like, the reservoir has high damage potential and is particularly easy to generate capillary self-priming phenomenon. In the development process of the tight sandstone gas reservoir, even under the underbalance condition, various water-based working fluids such as drilling fluid, completion fluid, flushing fluid, workover fluid, fracturing fluid and the like can contact the reservoir and further invade the stratum to form liquid phase retention, and the water saturation of the reservoir near a near-wellbore area or a fracture surface is increased, so that water lock damage is caused, the gas phase permeability is seriously reduced, and the exploitation cost is increased. The water lock damage is the core problem of the damage of the dense gas reservoir and is also the main obstacle of the development of the dense gas, so a great number of scholars carry out a great deal of research on the water lock removing effect, including various physicochemical methods such as an increase production pressure difference method, a hydraulic fracturing method, surfactant addition and the like, but the defects of unsatisfactory effect, limited method and the like still exist. Researches find that the drier can react with the primary water and the retained water-based working solution in the stratum quickly, so that the gas seepage capability can be improved well, and the recovery ratio of a compact gas reservoir can be improved. And reasonable working parameters of the drying agent are selected in combination with the actual field, so that the first step of drying construction is realized. However, no special device is used for experimental screening of working parameters of the long core drying agent at present, so that a more effective experimental screening mode is found, and great significance is brought to improvement of field effects.
Disclosure of Invention
The invention aims to overcome the problems in the prior art and provides a long core drying seepage experimental device and an experimental method.
The invention provides a long core drying seepage experiment device, which comprises a long core clamping mechanism, wherein the long core clamping mechanism comprises:
a rock core holder, one end of which is an inlet end and the other end is an outlet end;
the stirring device comprises a stirring cylinder, a stirring rod and a motor, wherein the stirring cylinder is hermetically connected with the inlet end, the stirring rod is positioned in the stirring cylinder, the motor is arranged outside the stirring cylinder, and an output shaft of the motor is connected with the stirring rod and used for driving the stirring rod to rotate;
the core holder is provided with a plurality of detection interfaces which are uniformly distributed on the core holder, and the detection interfaces are respectively connected with a pressure measuring device and a resistance measuring device and are used for detecting pressure and resistivity.
Preferably, the device further comprises a first piston container, a second piston container, a third piston container, a fourth piston container, a booster pump, a constant-temperature oven, a back pressure valve and a double-cylinder constant-speed constant-pressure pump, wherein the double-cylinder constant-speed constant-pressure pump and the first piston container are connected with the mixing drum through first connecting pipelines, the double-cylinder constant-speed constant-pressure pump, the second piston container and the third piston container are connected with the inlet end through second connecting pipelines, the double-cylinder constant-speed constant-pressure pump and the fourth piston container are connected with the outlet end through third connecting pipelines, the back pressure valve and the booster pump are both connected with the outlet end, the booster pump is also connected with the back pressure valve, and the long core clamping mechanism, the first piston container and the second piston container are located in the constant-; the outlet end is connected with a gas metering device, and the inlet end and the outlet end are both provided with pressure sensors.
Preferably, the front surface of the mixing drum is provided with a visible glass window.
Preferably, a valve is arranged on each connecting pipeline at the inlet end and the outlet end.
Preferably, the distance between two adjacent detection interfaces is 10 cm.
Preferably, the booster pump is a manual booster pump.
The experimental method of the long core drying seepage experimental device comprises the following steps:
s101, preparing an experimental device;
s102, preparing a rock core: preparing a plurality of rock cores with the diameter of 2.5cm +/-10% and the length of 4-7cm according to experiment needs, drying the rock cores, vacuumizing and saturating prepared formation water;
s103, loading a rock core: opening a plunger at the right end of the rock core holder, sequentially putting the rock core columns with the lengths of 4-7cm by using a harmonic-mean method, adjusting the total length of the rock cores according to actual needs, putting filter paper between two adjacent rock cores, and closing the plunger at the right end after the rock cores are filled;
s104, establishing irreducible water saturation: applying confining pressure in the core holder, and introducing nitrogen to displace the rock sample in the core holder to a water-bound state;
s105, measuring the water saturation and permeability of each rock core: releasing the pressure of the core holder, opening a plunger at the right end of the core holder, taking out the core, measuring the saturation and permeability of the bound water of each core, and then reloading the core according to the method S103;
s106, preparation of a drying agent: putting the drying agent prepared according to the proportion into a first piston container, and injecting CO into the first piston container2Then heating the first piston container to 40-80 ℃, and pressurizing to 10-20MPa to ensure that CO in the first piston container2Reaching a supercritical state;
s107, pressurizing the core holder and the back pressure valve to an experimental pressure, and stopping pressurizing after the pressure is stable;
s108, switching on a power supply of the motor to enable the stirring rod to operate;
s109, opening a valve between the first piston container and the mixing drum, injecting experimental amount of supercritical carbon dioxide dissolved with a drying agent into the core holder at a constant speed after passing through the mixing drum and entering a core hole, observing the state of the drying agent and the rotating speed of a mixing device during the period, preferably avoiding the occurrence of particulate precipitates, and simultaneously detecting and recording the changes of the pressure and the resistivity of each detection interface along with time;
s110, after a drying agent is injected into the core, setting the temperature of a constant-temperature oven as a drying reaction temperature;
s111, monitoring pressure values of an inlet end and each detection interface to obtain pressure change in the core holder, metering gas at an outlet end through a gas flowmeter, and finishing reaction when the pressure is stable and the readings of the gas flowmeter are unchanged;
s112, releasing pressure by using a back pressure valve, injecting an ethanol solution into the rock core as a post solution, and reacting for 30-120 minutes;
s113, after the nitrogen is used for driving reversely for 30-120 minutes, the nitrogen is used for positive constant-pressure displacement, the pressure at the inlet end and the pressure at each pressure measuring point along the way are simultaneously tested, the gas flow at the outlet end is measured by a gas meter, and the operation is stopped when the pressure is stable and the readings of the gas meter are unchanged;
s114, carrying out confining pressure relief on the rock core holder;
s115, taking out a rock core, and respectively measuring the permeability and the water saturation of each rock sample;
and S116, closing the instrument power supply and the equipment valve, cleaning the equipment and ending the experiment.
Preferably, the specific operation of step S104 is as follows: applying confining pressure to the rock core holder by using a booster pump; and a double-cylinder constant-speed constant-pressure pump is arranged to operate at constant pressure, and the rock sample in the rock core holder is displaced to a water-binding state by using nitrogen in a third piston container, wherein the displacement time is 12 hours.
Preferably, the total length of all cores in step S103 does not exceed 100 cm.
Compared with the prior art, the invention has the beneficial effects that: according to the experiment device, the visual stirring device can be used for stirring the entering materials through the arranged long core drying seepage experiment device, so that the reaction is more sufficient, the problem of precipitation of the drying agent can be effectively solved, the resistivity and the pressure of the long core along the way can be measured through the way measuring point, the depth of the drying agent injected into the core and the water saturation at the measuring point are inverted, and the experiment condition can be conveniently known in real time.
The experiment method provided by the invention can truly reflect the condition that the drying agent is injected into the stratum by carrying out the drying seepage experiment on the core with the length of 1 m. Simultaneously, the requirement of stirring and injecting liquid is met, so that the medicine is fully dissolved in the supercritical carbon dioxide, and the drying effect of the drying agent is improved. The experimental method also considers the problem of treatment of the drying reaction product, and utilizes ethanol solution as the post solution and high-pressure nitrogen reverse displacement to discharge the precipitate generated by the reaction out of the pores of the core, thereby avoiding the problem that the permeability is not increased or decreased because the product blocks the pores, and greatly increasing the success rate of the drying reaction. In addition, the pressure and resistivity changes at each detection interface are monitored in real time in the experimental process, the distance of the drying agent injected into the rock core and the water saturation change at the measuring point are mastered in real time, and the experimental basis is provided for subsequent numerical simulation.
Drawings
FIG. 1 is a schematic structural view of a long core holder according to the present invention;
fig. 2 is a schematic structural diagram of the long core drying seepage experimental device of the invention.
Description of reference numerals:
1. the device comprises a core holder, 2 parts of an inlet end, 3 parts of an outlet end, 4 parts of a stirring rod, 5 parts of a motor, 6 parts of a detection interface, 7 parts of a first piston container, 8 parts of a second piston container, 9 parts of a third piston container, 10 parts of a fourth piston container, 11 parts of a booster pump, 12 parts of a constant-temperature oven, 13 parts of a back pressure valve, 14 parts of a constant-pressure constant-speed double-cylinder pump, 15 parts of a gas metering device, 16 parts of a stirring cylinder, 17 parts of a first pressure sensor and 18 parts of a second pressure sensor.
Detailed Description
Detailed description of the preferred embodimentsthe following detailed description of the present invention will be made with reference to the accompanying drawings 1-2, although it should be understood that the scope of the present invention is not limited to the specific embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
The invention provides a long core drying seepage experiment device which comprises a long core clamping mechanism, wherein the long core clamping mechanism comprises:
a core holder 1, one end of which is an inlet end 2 and the other end is an outlet end 3;
the stirring device comprises a stirring cylinder 16, a stirring rod 4 and a motor 5, wherein the stirring cylinder 16 is hermetically connected with the inlet end 2, the stirring rod 4 is positioned in the stirring cylinder 16, the motor 5 is arranged outside the stirring cylinder 16, and an output shaft of the motor 5 is connected with the stirring rod 4 and used for driving the stirring rod 4 to rotate;
the detection interfaces 6 are uniformly distributed on the rock core holder 1, and the detection interfaces 6 are respectively connected with a pressure measuring device and a resistance measuring device and used for detecting pressure and resistivity.
Preferably, the device further comprises a first piston container 7, a second piston container 8, a third piston container 9, a fourth piston container 10, a booster pump 11, a constant-temperature oven 12, a back pressure valve 13 and a double-cylinder constant-speed constant-pressure pump 14, wherein the double-cylinder constant-speed constant-pressure pump 14 and the first piston container 7 are connected with a mixing drum 16 through a first connecting pipeline, the double-cylinder constant-speed constant-pressure pump 14, the second piston container 8 and the third piston container 9 are connected with the inlet end 2 through a second connecting pipeline, the double-cylinder constant-speed constant-pressure pump 14 and the fourth piston container 10 are connected with the outlet end 3 through a third connecting pipeline, the back pressure valve 13 and the booster pump 11 are both connected with the outlet end 3, the booster pump 11 is further connected with the back pressure valve 13, and the long core clamping mechanism, the first piston container 7 and the second piston container 8 are located in; the outlet end 3 is connected with a gas metering device 15, and the inlet end 2 and the outlet end 3 are both provided with pressure sensors.
Preferably, the front surface of the mixing drum 16 is provided with a visible glass window.
Preferably, valves are provided on each connecting line at the inlet end 2 and the outlet end 3.
Preferably, the distance between two adjacent detection interfaces 6 is 10 cm.
Preferably, the booster pump 11 is a manual booster pump.
The experimental method of the long core drying seepage experimental device comprises the following steps:
s101, preparing an experimental device;
s102, preparing a rock core: preparing a plurality of rock cores with the diameter of 2.5cm +/-10% and the length of 4-7cm according to experiment needs, drying the rock cores, vacuumizing and saturating prepared formation water;
s103, loading a rock core: opening a plunger at the right end of the rock core holder, sequentially putting the rock core columns with the lengths of 4-7cm by using a harmonic-mean method, adjusting the total length of the rock cores according to actual needs, putting filter paper between two adjacent rock cores, and closing the plunger at the right end after the rock cores are filled;
s104, establishing irreducible water saturation: applying confining pressure in the core holder, and introducing nitrogen to displace the rock sample in the core holder to a water-bound state;
s105, measuring the water saturation and permeability of each rock core: releasing the pressure of the core holder, opening a plunger at the right end of the core holder, taking out the core, measuring the saturation and permeability of the bound water of each core, and then reloading the core according to the method S103;
s106, preparation of a drying agent: putting the drying agent prepared according to the proportion into a first piston container, and injecting CO into the first piston container2Then heating the first piston container to 40-80 ℃, and pressurizing to 10-20MPa to ensure that CO in the first piston container2Reaching a supercritical state;
s107, pressurizing the core holder and the back pressure valve to an experimental pressure, and stopping pressurizing after the pressure is stable;
s108, switching on a power supply of the motor to enable the stirring rod to operate;
s109, opening a valve between the first piston container and the mixing drum, injecting experimental amount of supercritical carbon dioxide dissolved with a drying agent into the core holder at a constant speed after passing through the mixing drum and entering a core hole, observing the state of the drying agent and the rotating speed of a mixing device during the period, preferably avoiding the occurrence of particulate precipitates, and simultaneously detecting and recording the changes of the pressure and the resistivity of each detection interface along with time;
s110, after a drying agent is injected into the core, setting the temperature of a constant-temperature oven as a drying reaction temperature;
s111, monitoring pressure values of an inlet end and each detection interface to obtain pressure change in the core holder, metering gas at an outlet end through a gas flowmeter, and finishing reaction when the pressure is stable and the readings of the gas flowmeter are unchanged;
s112, releasing pressure by using a back pressure valve, injecting an ethanol solution into the rock core as a post solution, and reacting for 30-120 minutes;
s113, after the nitrogen is used for driving reversely for 30-120 minutes, the nitrogen is used for positive constant-pressure displacement, the pressure at the inlet end and the pressure at each pressure measuring point along the way are simultaneously tested, the gas flow at the outlet end is measured by a gas meter, and the operation is stopped when the pressure is stable and the readings of the gas meter are unchanged;
s114, carrying out confining pressure relief on the rock core holder;
s115, taking out a rock core, and respectively measuring the permeability and the water saturation of each rock sample;
and S116, closing the instrument power supply and the equipment valve, cleaning the equipment and ending the experiment.
Example (b):
(1) and (4) preparing an experiment. All valves are checked for closure so that all valves remain closed. A booster pump, a piston container, a gas flowmeter, a back pressure valve and a pressure sensor are connected to the long core holder, as shown in fig. 2.
(2) The core was prepared. A plurality of cores with the diameter of 2.5cm +/-10% and the length of 4-7cm are prepared according to experiment needs, and the prepared formation water is saturated after the dry cores are vacuumized.
(3) And (6) loading a rock core. And opening a plunger at the right end of the rock core holder, sequentially putting the rock core columns with the lengths of 4-7cm by using a harmonic-mean method, adjusting the total length of the rock core according to actual needs (the longest length is 100cm), putting filter paper between two adjacent rock cores, and closing the plunger at the right end after the rock cores are filled.
(4) Irreducible water saturation is established. Opening a valve 6, and applying confining pressure to the rock core holder by using a booster pump; opening the valve A and the valve C, simultaneously opening the valve 3 and the valve 8, setting a double-cylinder constant-speed constant-pressure pump to operate at constant pressure, utilizing nitrogen in the piston container 3 to displace the rock sample in the rock core holder to a bound water state, wherein the displacement time is 12 hours, releasing the pressure of the rock core holder after the displacement is finished, opening a plunger at the right end of the rock core holder, taking out the rock core, respectively measuring the bound water saturation and the gas-phase permeability of each rock core, and then refilling the rock core according to the method in the step (3).
The calculation formula is as follows:
wherein, KgIs effective permeability of gas phase, mum2(ii) a A is the cross-sectional area of the core in cm2(ii) a L is the core length, cm; mu.sgNitrogen viscosity for experiments, mPa · s; qgGas flow, cm, measured for the core exit end3/s；p1、p2The pressure at the inlet end and the outlet end of the rock core is respectively MPa.
(5) And (4) preparing a drying agent. Adding a drying agent system which is prepared according to the molar ratio into the piston container 1, and injecting CO into the piston container 12Then, thenThe heating switch of the constant temperature oven is opened to be heated to 60 ℃, and the piston container 1 is pressurized to 15MPa by utilizing the booster pump, so that CO in the piston container 12A supercritical state is reached.
(6) And opening the valve 6, the valve 7 and the valve 8, pressurizing the core holder and the back pressure valve to the experimental pressure by utilizing a booster pump respectively, closing the booster pump after the pressure is stable, and closing the valve 6 and the valve 7.
(7) Switching on a power supply of a motor to operate the stirring device; opening valve A and valve E, opening valve 1 simultaneously, start double-cylinder constant speed constant pressure pump and make the experimental amount of supercritical carbon dioxide who has dissolved the drier in piston container 1 get into the rock core hole with constant speed behind the churn, during through visual glass window observation drier state and agitating unit rotational speed to particulate matter precipitate does not appear as the benefit, the change along with time of the pressure and the resistivity of 9 pressure measurement electricity testing interface of record simultaneously.
(8) And after the drying agent is injected into the rock core, setting the temperature of the constant-temperature oven as the experimental temperature, and reacting for 40 minutes.
(9) Pressure changes in the clamp holder and gas at the outlet end are recorded by the pressure sensors at the inlet end 2 and the outlet end 3, and the gas at the outlet end is measured by the gas flowmeter, and the reaction is finished when the pressure is stable and the reading of the gas flowmeter is unchanged.
(10) Opening the valve 7, and relieving the pressure of the back pressure valve by using a booster pump; valve 1 and valve E are closed and valve 2 and valve D are opened. And injecting the ethanol solution in the piston container 2 into the rock core by using a double-cylinder constant-speed constant-pressure pump to serve as a post-solution, and reacting for 60 minutes.
(11) Opening the valve A, the valve B, the valve 4 and the valve 5, closing valves on other pipelines, performing reverse drive for 120 minutes by using nitrogen in the piston container 4, closing the valve B, the valve 4 and the valve 5, opening the valve C, the valve 3 and the valve 8, performing constant-pressure displacement by using nitrogen in the piston container 3, simultaneously testing the pressure at the inlet end and the pressure at the measuring point along the way by using a pressure sensor, measuring the gas flow at the outlet end by using a gas meter, and stopping when the pressure is stable and the readings of the gas flow meter are unchanged.
(12) And opening the valve 6, and carrying out confining pressure relief on the rock core holder by using a booster pump.
(13) And taking out the rock core, and respectively measuring the permeability and the water saturation of the rock sample after drying reaction.
(14) And (5) closing the instrument power supply and the equipment valve, cleaning the equipment and finishing the experiment.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. The utility model provides a long rock core mummification seepage flow experimental apparatus which characterized in that, includes long rock core fixture, this long rock core fixture includes:
the core holder (1) is provided with an inlet end (2) at one end and an outlet end (3) at the other end;
the stirring device comprises a stirring cylinder (16), a stirring rod (4) and a motor (5), wherein the stirring cylinder (16) is hermetically connected with the inlet end (2), the stirring rod (4) is positioned in the stirring cylinder (16), the motor (5) is arranged outside the stirring cylinder (16), and an output shaft of the motor (5) is connected with the stirring rod (4) and used for driving the stirring rod (4) to rotate;
the core holder is characterized by comprising a plurality of detection interfaces (6) which are uniformly distributed on the core holder (1), wherein the detection interfaces (6) are respectively connected with a pressure measuring device and a resistivity measuring device and are used for detecting pressure and resistivity.
2. The long core drying seepage experiment device according to claim 1, further comprising a first piston container (7), a second piston container (8), a third piston container (9), a fourth piston container (10), a booster pump (11), a constant temperature oven (12), a back pressure valve (13) and a double-cylinder constant-speed constant-pressure pump (14), wherein the double-cylinder constant-speed constant-pressure pump (14) and the first piston container (7) are connected with the stirring barrel (16) through a first connecting pipeline, the double-cylinder constant-speed constant-pressure pump (14), the second piston container (8) and the third piston container (9) are connected with the inlet end (2) through a second connecting pipeline, the double-cylinder constant-pressure pump (14) and the fourth piston container (10) are connected with the outlet end (3) through a third connecting pipeline, the back pressure valve (13) and the booster pump (11) are both connected with the outlet end (3), the booster pump (11) is also connected with a back pressure valve (13), and the long core clamping mechanism, the first piston container (7) and the second piston container (8) are positioned in the constant-temperature oven (12); the outlet end (3) is connected with a gas metering device (15), and the inlet end (2) and the outlet end (3) are both provided with pressure sensors.
3. The long core drying seepage experiment device as claimed in claim 2, wherein a visible glass window is arranged on the front surface of the mixing drum (16).
4. The long core drying seepage experiment device according to claim 2, wherein valves are arranged on each connecting pipeline at the inlet end (2) and the outlet end (3).
5. The long core drying seepage experiment device according to claim 1, wherein the distance between two adjacent detection interfaces (6) is 10 cm.
6. The long core drying seepage experiment device according to claim 2, wherein the booster pump (11) is a manual booster pump.
7. The experimental method of the long core drying seepage experimental device as claimed in claim 2, characterized by comprising the following steps:
s101, preparing an experimental device;
s102, preparing a rock core: preparing a plurality of rock cores with the diameter of 2.5cm +/-10% and the length of 4-7cm according to experiment needs, drying the rock cores, vacuumizing and saturating prepared formation water;
s103, loading a rock core: opening a plunger at the right end of the rock core holder, sequentially putting the rock core columns with the lengths of 4-7cm by using a harmonic-mean method, adjusting the total length of the rock cores according to actual needs, putting filter paper between two adjacent rock cores, and closing the plunger at the right end after the rock cores are filled;
s104, establishing irreducible water saturation: applying confining pressure in the core holder, and introducing nitrogen to displace the rock sample in the core holder to a water-bound state;
s105, measuring the water saturation and permeability of each rock core: releasing the pressure of the core holder, opening a plunger at the right end of the core holder, taking out the core, measuring the saturation and permeability of the bound water of each core, and then reloading the core according to the method S103;
s106, preparation of a drying agent: putting the drying agent prepared according to the proportion into a first piston container, and injecting CO into the first piston container2Then heating the first piston container to 40-80 ℃, pressurizing to 10-20MPa, and enabling CO in the first piston container2Reaching a supercritical state;
s107, pressurizing the core holder and the back pressure valve to an experimental pressure, and stopping pressurizing after the pressure is stable;
s108, switching on a power supply of the motor to enable the stirring rod to operate;
s109, opening a valve between the first piston container and the mixing drum, injecting experimental amount of supercritical carbon dioxide dissolved with a drying agent into the core holder at a constant speed after passing through the mixing drum and entering a core hole, observing the state of the drying agent and the rotating speed of a mixing device during the period, preferably avoiding the occurrence of particulate precipitates, and simultaneously detecting and recording the changes of the pressure and the resistivity of each detection interface along with time;
s110, after a drying agent is injected into the core, setting the temperature of a constant-temperature oven as a drying reaction temperature;
s111, monitoring pressure values of an inlet end and each detection interface to obtain pressure change in the core holder, metering gas at an outlet end through a gas flowmeter, and finishing reaction when the pressure is stable and the readings of the gas flowmeter are unchanged;
s112, releasing pressure by using a back pressure valve, injecting an ethanol solution into the rock core as a post solution, and reacting for 30-120 minutes;
s113, after the nitrogen is used for driving reversely for 30-120 minutes, the nitrogen is used for positive constant-pressure displacement, the pressure at the inlet end and the pressure at each pressure measuring point along the way are simultaneously tested, the gas flow at the outlet end is measured by a gas meter, and the operation is stopped when the pressure is stable and the readings of the gas meter are unchanged;
s114, carrying out confining pressure relief on the rock core holder;
s115, taking out a rock core, and respectively measuring the permeability and the water saturation of each rock sample;
and S116, closing the instrument power supply and the equipment valve, cleaning the equipment and ending the experiment.
8. The experimental method of the long core drying seepage experimental apparatus according to claim 7, wherein the specific operations of step S104 are as follows: applying confining pressure to the rock core holder by using a booster pump; and a double-cylinder constant-speed constant-pressure pump is arranged to operate at constant pressure, and the rock sample in the rock core holder is displaced to a water-binding state by using nitrogen in a third piston container, wherein the displacement time is 12 hours.
9. The experimental method of the long core drying seepage experimental facility as claimed in claim 7, wherein the total length of all the cores in step S103 is not more than 100 cm.
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