CN111855522B - Core holder, high-temperature high-pressure core spontaneous imbibition experimental device and method - Google Patents
Core holder, high-temperature high-pressure core spontaneous imbibition experimental device and method Download PDFInfo
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- CN111855522B CN111855522B CN201910344368.2A CN201910344368A CN111855522B CN 111855522 B CN111855522 B CN 111855522B CN 201910344368 A CN201910344368 A CN 201910344368A CN 111855522 B CN111855522 B CN 111855522B
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- 238000005213 imbibition Methods 0.000 title claims abstract description 64
- 238000000034 method Methods 0.000 title claims abstract description 34
- 230000002269 spontaneous effect Effects 0.000 title claims abstract description 33
- 239000007788 liquid Substances 0.000 claims abstract description 96
- 238000006073 displacement reaction Methods 0.000 claims abstract description 22
- 239000010779 crude oil Substances 0.000 claims abstract description 9
- 230000001105 regulatory effect Effects 0.000 claims abstract description 8
- 239000013589 supplement Substances 0.000 claims abstract description 3
- 238000002474 experimental method Methods 0.000 claims description 34
- 239000011435 rock Substances 0.000 claims description 15
- 238000007789 sealing Methods 0.000 claims description 14
- 239000003921 oil Substances 0.000 claims description 8
- 239000012466 permeate Substances 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 238000004064 recycling Methods 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 238000003556 assay Methods 0.000 claims 2
- 239000007789 gas Substances 0.000 description 21
- 239000012530 fluid Substances 0.000 description 13
- 238000010586 diagram Methods 0.000 description 8
- 238000005259 measurement Methods 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000005303 weighing Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 238000009991 scouring Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000007717 exclusion Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000003350 kerosene Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
- G01N13/04—Investigating osmotic effects
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
- G01N2013/003—Diffusion; diffusivity between liquids
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
- G01N13/02—Investigating surface tension of liquids
- G01N2013/0291—Wilhelmy plate
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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
- G01N2015/0813—Measuring intrusion, e.g. of mercury
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
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- Chemical & Material Sciences (AREA)
- Biochemistry (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Dispersion Chemistry (AREA)
- Measuring Fluid Pressure (AREA)
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Abstract
The invention provides a core holder, a high-temperature high-pressure core spontaneous imbibition experimental device and a method, wherein the method comprises the steps of placing a target core in the core holder, constructing the high-temperature high-pressure core spontaneous imbibition experimental device according to a corresponding connection relation, and adjusting the temperature of a constant temperature box to an experimental temperature; setting the pressure of the back pressure control device as a target pressure experimental pressure; after the pressure of the constant pressure device is regulated to be slightly lower than the experimental pressure, the seepage liquid contained in the intermediate container is subjected to pressure compensation through the gas in the high-pressure gas cylinder; the pressure of the constant pressure device is adjusted to be slightly higher than the experimental pressure, then the seepage liquid after the pressure supplement in the intermediate container is introduced into the core holder, at the moment, the metering pipe end has gas output, after the gas is emptied, the amount of crude oil permeated out is started to be metered, and the introduction of the seepage liquid is stopped; and starting a high-pressure displacement pump, introducing seepage liquid contained in the seepage liquid storage tank into the core holder, and measuring the amount of crude oil sucked out through the measuring pipe.
Description
Technical Field
The invention relates to a core holder, a high-temperature high-pressure core spontaneous imbibition experimental device and a method, and belongs to the technical fields of petroleum exploration and development and oil reservoir engineering.
Background
At present, in petroleum engineering experimental methods, imbibition experiments are main methods for researching reservoir wettability and imbibition displacement processes, and two main measuring methods are available at present, namely a weighing method and an imbibition bottle measuring method.
The weighing method measurement principle and the structure schematic diagram of the used device are shown in fig. 1, and as can be seen from fig. 1, the device comprises a fixing frame 1, a lifting rope 2, a core 3, a beaker 4 and a balance 5: the method comprises the steps of immersing a rock core in water in a beaker, measuring the weight of the beaker at different moments through a balance, and obtaining the sucked oil quantity through the ratio of the weight change of the beaker to the oil-water density difference.
The schematic structural diagram of the measuring principle of the imbibition bottle and the used device is shown in fig. 2, and as can be seen from fig. 2, the device comprises an imbibition bottle 6, a core 3, a core frame 7 and a sealing base 8: the method is that the rock sample is placed in a seepage bottle and filled with water, and the permeated crude oil is concentrated to a thin mouth through buoyancy and is measured.
It can be seen from the two experimental methods that the experiment must be performed under normal pressure and at higher temperature, the experiment is difficult to be completed due to the equipment conditions. Because the imbibition experiment is to reduce the imbibition process under the formation condition, the closer the experimental condition is to the formation condition, the more perfect the experiment is. The depth of the tight sandstone stratum is more than 2000 m, the stratum pressure is more than 20MPa, the temperature is more than 60 ℃ to 100 ℃, and the current experimental means are difficult to simulate the imbibition process under the condition.
However, at present, imbibition oil extraction is a very potential means for solving the problem of dense oil reservoir development, so that the establishment of a set of high-temperature and high-pressure core spontaneous imbibition experimental method and device has important significance.
Disclosure of Invention
To address the above-described shortcomings and drawbacks, it is an object of the present invention to provide a core holder.
Another object of the present invention is to provide a device for spontaneous imbibition experiment of a high-temperature and high-pressure core, wherein the device comprises the core holder.
It is still another object of the present invention to provide a method for testing spontaneous imbibition of a high-temperature and high-pressure core, wherein the method uses the device for testing spontaneous imbibition of a high-temperature and high-pressure core.
In order to achieve the above objective, in one aspect, the present invention provides a core holder, wherein the core holder includes a cylinder body with two open ends, a core fixing device, an upper cover body and a lower cover body;
the core fixing device is a hollow cylinder with a spiral structure inside, and is positioned inside the cylinder body and used for fixing a target core;
the upper cover body is hermetically connected with the upper end opening of the cylinder body through a sealing structure, and the upper cover body is provided with a liquid outlet;
the lower cover body is hermetically connected with the lower end opening of the cylinder body through a sealing structure, and is provided with a hollow liquid inlet for communicating the outside with the core fixing device;
and a cavity is formed between the bottom of the upper cover body and the core fixing device, the lower cover body is contacted with the core fixing device to support the core fixing device, and the top of the lower cover body stretches into the cavity of the core fixing device and is contacted with the target core to play a role in fixing the position of the target core.
According to an embodiment of the present invention, in the core holder, preferably, the bottom of the upper cover body has an inverted conical structure, so that a conical cavity is formed between the bottom of the upper cover body and the core fixing device.
Wherein, form the toper cavity between the bottom of this upper cover body and the rock core fixing device, make things convenient for the collection and the exclusion of the crude oil that oozes out in the rock core.
According to an embodiment of the present invention, in the core holder, preferably, the top of the lower cover body has a conical structure.
The top of the lower cover body is of a conical structure, so that the core and the lower cover body can be prevented from being in large-area contact, and the imbibition process is prevented from being influenced.
In the core holder according to the embodiment of the present invention, preferably, the sealing structure includes a sealing ring.
In the core holder according to the embodiment of the present invention, preferably, the liquid inlet is a T-shaped liquid inlet.
According to an embodiment of the present invention, in the core holder, preferably, the core fixing device is made of plastic.
According to an embodiment of the present invention, in the core holder, preferably, the cylinder, the upper cover and the lower cover are all made of stainless steel.
In the specific embodiment of the invention, the wall thickness of the cylinder body can be determined according to the pressure bearing size.
According to the specific embodiment of the invention, in the core holder, the core fixing device has a spiral structure inside, and the spiral structure has the following 3 functions:
1. fixing the core: in the experiment, the rock core is fixed in the rock core holder without displacement or turning over;
2. diversion effect: the fluid rises according to the spiral pore canal, which is beneficial to the directional flow of seepage liquid;
3. increase the scouring ability: due to the spiral structure, the flow profile is reduced, so that a higher flow velocity can be formed under the same flow condition, the effect of increasing the scouring capacity is achieved, the fluid at the imbibition position is carried and metered, and the experimental precision is improved.
The core holder provided by the invention has the working principle that:
in the experiment, the experimental fluid is injected from the bottom liquid inlet, the upper liquid outlet flows out, the experimental fluid is contacted with the target core to generate imbibition, and the imbibition fluid is carried out of the core holder by the injected experimental fluid for metering.
On the other hand, the invention also provides a high-temperature and high-pressure core spontaneous imbibition experimental device, wherein the high-temperature and high-pressure core spontaneous imbibition experimental device comprises:
the device comprises a displacement unit, a pressurizing unit, a core holding unit and an outlet control and metering unit;
the displacement unit comprises a high-pressure displacement pump, the pressurizing unit comprises a high-pressure gas cylinder, an intermediate container and a constant pressure device, the core holding unit comprises the core holder and a constant temperature box for placing the core holder, the outlet control and metering unit comprises a back pressure control device, a seepage liquid storage tank and a metering tube, the metering tube is positioned in seepage liquid contained in the seepage liquid storage tank, and the liquid level of the seepage liquid is slightly lower than the metering scale of the metering tube so as to meter the amount of the fluid sucked out;
the inlet of the high-pressure displacement pump is connected with an inlet pipeline, the inlet pipeline is inserted into seepage liquid contained in the seepage liquid storage tank, the outlet of the high-pressure displacement pump is connected with the liquid inlet of the core holder through an outlet pipeline, and the liquid outlet of the core holder is connected with the inlet of the metering pipe through a back pressure control device through a pipeline;
the outlet of the high-pressure gas cylinder is connected with the liquid inlet of the core holder through a constant pressure device and an intermediate container in sequence through a pipeline;
the intermediate container is a container for containing seepage liquid.
Wherein, the seepage liquid storage tank is the same as the seepage liquid contained in the intermediate container.
According to a specific embodiment of the present invention, in the experimental apparatus, preferably, the seepage liquid storage tank is a beaker.
In accordance with embodiments of the present invention, the metering tube used in the described experimental set-up is conventional equipment used in the art, and in one embodiment of the present invention, the metering tube may be an open-topped inverted funnel shaped collector.
According to the specific embodiment of the invention, in the high-temperature high-pressure core spontaneous imbibition experimental device, the high-pressure displacement pump is used for sucking seepage liquid from the beaker according to a certain flow rate in the experimental process, pressurizing the seepage liquid, then circularly injecting the seepage liquid into the core holder, enabling the seepage liquid to circularly flow in the core holder according to a certain pressure, carrying the permeated fluid out during imbibition, and metering the fluid into the metering tube.
In the experimental process, after the core is put into the core holder, the inside of the core holder is in a low-pressure state, pressure compensation is needed in order to achieve a high-pressure state, a booster pump is generally used for pressure compensation in the prior art, but the system is complex, the speed is low, and the imbibition process occurs simultaneously in the pressure compensation process, so that the acquisition and analysis of experimental data are not facilitated. In the specific embodiment of the invention, the characteristic of quick gas pressurization is utilized, the pressurization of the core holder is realized by adopting gas, and then seepage liquid contained in the middle container is displaced by using gas to enter the core holder, so that the process time is reduced as much as possible, and the quality of data acquisition is improved.
According to the specific embodiment of the invention, in the high-temperature and high-pressure core spontaneous imbibition experimental device, the core holder is mainly used for fixing the core, providing imbibition space and imbibition flow channel, and the incubator is used for providing constant temperature condition.
According to the specific embodiment of the invention, after the core holder forms high pressure, seepage liquid, fluid and gas which are seeped out flow out through the back pressure control device, and the back pressure control device achieves the aim of controlling the pressure environment in the core holder by controlling the liquid outlet pressure of the core holder; the fluid (seepage liquid, fluid and gas) flowing out of the core holder is separated in a metering tube, the metering tube is an inverted funnel-shaped collector with an open top, and after the flowing gas is separated, the fluid (oil) which is released from the top and is permeated out is gathered at the top of the metering tube, so that the purpose of metering is achieved.
In still another aspect, the present invention further provides a high-temperature and high-pressure core spontaneous imbibition experimental method, where the high-temperature and high-pressure core spontaneous imbibition experimental method uses the high-temperature and high-pressure core spontaneous imbibition experimental device described above, and the experimental method includes the following steps:
(1) Placing a target rock core in a rock core holder, constructing the high-temperature and high-pressure rock core spontaneous imbibition experimental device according to a corresponding connection relation, and adjusting the temperature of the incubator to an experimental temperature;
(2) Setting the pressure of the back pressure control device as an experimental pressure;
(3) After the pressure of the constant pressure device is regulated to be slightly lower than the experimental pressure, the seepage liquid contained in the intermediate container is subjected to pressure compensation through the gas in the high-pressure gas cylinder;
(4) The pressure of the constant pressure device is adjusted to be slightly higher than the experimental pressure, then the seepage liquid after the pressure supplement in the intermediate container in the step (3) is introduced into the core holder, at the moment, the metering pipe end has gas output, after the gas is emptied, the original oil quantity of seepage is started to be metered, and the introduction of the seepage liquid is stopped;
(5) And starting a high-pressure displacement pump, introducing seepage liquid contained in the seepage liquid storage tank into the core holder, and measuring the amount of crude oil sucked out through the measuring pipe.
According to a preferred embodiment of the present invention, when the permeate is a single medium, the method further comprises separating the permeate entering the metering tube before sending it to a permeate storage tank or intermediate vessel for recycling.
When the seepage liquid is a single medium, such as water, the seepage liquid is separated in a metering pipe and is combined with the seepage liquid in a seepage liquid storage tank or an intermediate container for recovery, and then the seepage liquid can be reinjected into the core holder, so that the aim of cyclic injection is fulfilled.
According to a specific embodiment of the present invention, in the experimental method, preferably, the seepage liquid is water.
According to a specific embodiment of the present invention, in the experimental method, preferably, the experimental pressure is 10 to 30MPa.
According to a specific embodiment of the present invention, in the experimental method, preferably, the experimental temperature is from normal temperature to 90 ℃.
According to a specific embodiment of the present invention, in the experimental method, preferably, step (3) is: and after the pressure of the constant pressure device is regulated to be 1-5MPa lower than the experimental pressure, the seepage liquid contained in the intermediate container is subjected to pressure compensation through the gas in the high-pressure gas cylinder.
According to a specific embodiment of the present invention, in the experimental method, preferably, step (4) is: and (3) the pressure of the constant pressure device is up-regulated to be 1-5MPa higher than the experimental pressure, and then the seepage liquid after pressure compensation in the intermediate container in the step (3) is introduced into the core holder.
The core holder, the method and the device for the core spontaneous imbibition experiment at high temperature and high pressure well solve the problem of core imbibition measurement at high temperature and high pressure, and lead the experimental conditions of the imbibition measurement to be more in line with the field conditions.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for the description of the embodiments will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a weighing method measuring principle and a device used in the prior art.
Fig. 2 is a schematic diagram of the measurement principle of the conventional imbibition bottle and the structure of the device used in the prior art.
Fig. 3 is a schematic structural diagram of the core holder according to an embodiment of the present invention.
Fig. 4 is a schematic structural diagram of the high-temperature and high-pressure core spontaneous imbibition experimental device provided in the embodiment of the invention.
Fig. 5 is a graph showing the comparison of the experimental results obtained in the high-temperature high-pressure imbibition experiment provided in the example of the invention with the experimental results obtained in the conventional imbibition experiment in the comparative example.
The main reference numerals illustrate:
0. a core holder;
1. a fixing frame;
2. a hanging rope;
3. core;
4. a beaker;
5. a balance;
6. a imbibition bottle;
7. a core holder;
8. sealing the base;
9. an upper cover;
10. a cylinder;
11. a core fixing device;
12. a lower cover;
13. a high pressure displacement pump;
14. a seepage liquid storage tank;
15. back pressure control means;
16. metering tube;
17. a constant temperature box;
18. a constant pressure device;
19. a high pressure gas cylinder;
20. an intermediate container.
Detailed Description
In order to make the technical features, objects and advantageous effects of the present invention more clearly understood, the technical aspects of the present invention will now be described in detail with reference to the following specific examples, but should not be construed as limiting the scope of the present invention.
Example 1
The present embodiment provides a core holder, the schematic structural diagram of which is shown in fig. 3, and as can be seen from fig. 3, the core holder includes a cylinder body 10 with two open ends, a core fixing device 11, an upper cover 9 and a lower cover 12;
the core fixing device 11 is a hollow cylinder with a spiral structure inside, and is positioned inside the cylinder body 10 to fix the target core 3;
the upper cover 9 is hermetically connected with the upper end opening of the cylinder 10 through a sealing structure (such as a sealing ring, not shown in the figure), and the upper cover 9 is provided with a liquid outlet;
the lower cover 12 is hermetically connected with the lower end opening of the cylinder 10 through a sealing structure (such as a sealing ring, not shown in the figure), and the lower cover 12 is provided with a hollow liquid inlet for communicating the outside with the core fixing device 11;
a cavity is formed between the bottom of the upper cover body 9 and the core fixing device 11, the lower cover body 12 is contacted with the core fixing device 11 to support the core fixing device 11, and the top of the lower cover body 12 extends into the cavity of the core fixing device 11 and is contacted with the target core 3;
in this embodiment, the bottom of the upper cover 9 has an inverted conical structure, so that a conical cavity is formed between the bottom of the upper cover 9 and the core fixing device 11.
In this embodiment, the top of the lower cover 12 has a conical structure.
In this embodiment, the liquid inlet is a T-shaped liquid inlet.
In this embodiment, the core fixing device 11 is made of plastic.
In this embodiment, the cylinder 10, the upper cover 9 and the lower cover 12 are made of stainless steel.
Example 2
The embodiment provides a high-temperature and high-pressure core spontaneous imbibition experimental device, wherein a structural schematic diagram of the high-temperature and high-pressure core spontaneous imbibition experimental device is shown in fig. 4, and as can be seen from fig. 4, the experimental device comprises: the device comprises a displacement unit, a pressurizing unit, a core holding unit and an outlet control and metering unit;
the displacement unit comprises a high-pressure displacement pump 13, the pressurizing unit comprises a high-pressure gas cylinder 19, an intermediate container 20 and a constant pressure device 18, the core holding unit comprises a core holder 0 provided by the embodiment and an incubator 17 used for placing the core holder, the outlet control and metering unit comprises a back pressure control device 15, a seepage liquid storage tank 14 and a metering pipe 16, the metering pipe is positioned in seepage liquid contained in the seepage liquid storage tank, and the liquid level of the seepage liquid is slightly lower than the metering scale of the metering pipe;
the inlet of the high-pressure displacement pump is connected with an inlet pipeline, the inlet pipeline is inserted into seepage liquid contained in the seepage liquid storage tank, the outlet of the high-pressure displacement pump is connected with the liquid inlet of the core holder through an outlet pipeline, and the liquid outlet of the core holder is connected with the inlet of the metering pipe through a back pressure control device through a pipeline;
the outlet of the high-pressure gas cylinder is connected with the liquid inlet of the core holder through a constant pressure device and an intermediate container in sequence through a pipeline;
the intermediate container is a container for containing seepage liquid.
In this embodiment, the percolating liquid storage tank is a beaker.
Example 3
The embodiment provides a high-temperature and high-pressure core spontaneous imbibition experimental method, wherein the high-temperature and high-pressure core spontaneous imbibition experimental method utilizes the high-temperature and high-pressure core spontaneous imbibition experimental device provided in the embodiment 2, and a target core used for the experiment is taken from a 7-reservoir outcrop parallel sample with a Hubei basin length of 5cm, a rock sample length of 2.5cm, a diameter of 0.15mD, a porosity of 10.5%, saturated kerosene in the core, and an oil saturation of 51%. The experimental temperature was 60℃and the experimental pressure was 11MPa.
The experimental method comprises the following steps:
(1) Placing a target core of saturated crude oil into a core holder, constructing the high-temperature and high-pressure core spontaneous imbibition experimental device according to a corresponding connection relation, and adjusting the temperature of the incubator to 60 ℃;
(2) Setting the pressure of the back pressure control device to 11MPa;
(3) After the pressure of the constant pressure device is regulated to 8MPa, the seepage liquid contained in the intermediate container is subjected to pressure compensation through the gas in the high-pressure gas cylinder;
(4) The pressure of the constant pressure device is adjusted to 12MPa, then the seepage liquid after pressure compensation in the intermediate container in the step (3) is introduced into the core holder, at the moment, the end of the metering pipe has gas output, after the gas is emptied, the amount of crude oil permeated out is started to be metered, and the introduction of the seepage liquid is stopped;
(5) And starting a high-pressure displacement pump, introducing seepage liquid contained in the seepage liquid storage tank into the core holder, and measuring the amount of crude oil sucked out through the measuring pipe.
In this embodiment, the seepage liquid is water, so the method further comprises separating the seepage liquid entering the metering tube and then sending the seepage liquid to a seepage liquid storage tank or an intermediate container for recycling.
Comparative example 1
The same core as in example 3 was subjected to a imbibition displacement test using imbibition experiments conventionally used in the art at present. The target core used in this comparative example was the same as the core used in example 3, the experimental temperature was room temperature and the experimental pressure was normal pressure.
Among them, experimental data obtained in example 3 of the present invention and comparative example 2 are shown in the following table 1.
TABLE 1
As shown in FIG. 5, the graph of the experimental results obtained in the high-temperature and high-pressure imbibition experiment provided in the embodiment 3 of the invention is compared with the experimental results obtained in the conventional imbibition experiment in the comparative example 2, and as can be seen from FIG. 5, the experimental pressure and the experimental temperature adopted in the high-temperature and high-pressure core spontaneous imbibition experiment method provided by the invention are higher pressure and higher temperature, and compared with the conventional imbibition experiment in the prior art, the temperature and the pressure are changed, and the imbibition curve is also shifted.
Therefore, the core holder, the high-temperature high-pressure core spontaneous imbibition experimental method and the device provided by the invention can be used for well solving the problem of core imbibition measurement at high temperature and high pressure, so that the imbibition measurement experimental conditions are more in line with the field conditions.
The foregoing description of the embodiments of the invention is not intended to limit the scope of the invention, so that the substitution of equivalent elements or equivalent variations and modifications within the scope of the invention shall fall within the scope of the patent. In addition, the technical features and the technical features, the technical features and the technical invention can be freely combined for use.
Claims (12)
1. The utility model provides a spontaneous imbibition experimental apparatus of high temperature high pressure rock core, its characterized in that, the spontaneous imbibition experimental apparatus of high temperature high pressure rock core includes: the device comprises a displacement unit, a pressurizing unit, a core holding unit and an outlet control and metering unit;
the core loading unit comprises a core holder and an incubator for placing the core holder, wherein the core holder comprises a cylinder body with two open ends, a core fixing device, an upper cover body and a lower cover body;
the core fixing device is a hollow cylinder with a spiral structure inside, and is positioned inside the cylinder body and used for fixing a target core;
the upper cover body is hermetically connected with the upper end opening of the cylinder body through a sealing structure, and the upper cover body is provided with a liquid outlet;
the lower cover body is hermetically connected with the lower end opening of the cylinder body through a sealing structure, the lower cover body is provided with a hollow liquid inlet used for communicating the outside with the core fixing device, and the liquid inlet is of a T-shaped structure; wherein the top of the lower cover body is of a conical structure;
the bottom of the upper cover body is of an inverted conical structure, so that a conical cavity is formed between the bottom of the upper cover body and the core fixing device, the lower cover body is contacted with the core fixing device to support the core fixing device, and the top of the lower cover body stretches into the hollow of the core fixing device and is contacted with a target core;
the outlet control and metering unit comprises a back pressure control device, a seepage liquid storage tank and a metering pipe, wherein the metering pipe is positioned in seepage liquid contained in the seepage liquid storage tank, and the liquid level of the seepage liquid is slightly lower than the metering scale of the metering pipe;
the inlet of the high-pressure displacement pump is connected with an inlet pipeline, the inlet pipeline is inserted into seepage liquid contained in the seepage liquid storage tank, the outlet of the high-pressure displacement pump is connected with the liquid inlet of the core holder through an outlet pipeline, and the liquid outlet of the core holder is connected with the inlet of the metering pipe through a back pressure control device through a pipeline;
the outlet of the high-pressure gas cylinder is connected with the liquid inlet of the core holder through a constant pressure device and an intermediate container in sequence through a pipeline;
the intermediate container is a container for containing seepage liquid.
2. The experimental set-up of claim 1, wherein the percolating liquid reservoir is a beaker.
3. An assay device according to claim 1 or claim 2 wherein the sealing arrangement comprises a sealing ring.
4. The experimental device according to claim 1 or 2, wherein the core fixing device is made of plastic.
5. The experimental device according to claim 1 or 2, wherein the cylinder, the upper cover and the lower cover are made of stainless steel.
6. The high-temperature and high-pressure core spontaneous imbibition experimental method is characterized in that the high-temperature and high-pressure core spontaneous imbibition experimental method utilizes the high-temperature and high-pressure core spontaneous imbibition experimental device according to any one of claims 1-5, and comprises the following steps:
(1) Placing a target rock core in a rock core holder, constructing the high-temperature and high-pressure rock core spontaneous imbibition experimental device according to a corresponding connection relation, and adjusting the temperature of the incubator to an experimental temperature;
(2) Setting the pressure of the back pressure control device as an experimental pressure;
(3) After the pressure of the constant pressure device is regulated to be slightly lower than the experimental pressure, the seepage liquid contained in the intermediate container is subjected to pressure compensation through the gas in the high-pressure gas cylinder;
(4) The pressure of the constant pressure device is adjusted to be slightly higher than the experimental pressure, then the seepage liquid after the pressure supplement in the intermediate container in the step (3) is introduced into the core holder, at the moment, the metering pipe end has gas output, after the gas is emptied, the original oil quantity of seepage is started to be metered, and the introduction of the seepage liquid is stopped;
(5) And starting a high-pressure displacement pump, introducing seepage liquid contained in the seepage liquid storage tank into the core holder, and measuring the amount of crude oil sucked out through the measuring pipe.
7. The method according to claim 6, wherein when the permeate is a single medium, the method further comprises separating the permeate entering the metering tube and then feeding the separated permeate to a permeate storage tank or an intermediate container for recycling.
8. The assay of claim 6 or 7, wherein the seepage liquid is water.
9. The method according to claim 6 or 7, wherein the experimental pressure is 10-30MPa.
10. The method according to claim 6 or 7, wherein the experimental temperature is from ambient temperature to 90 o C。
11. The method according to claim 6 or 7, wherein step (3) is: and after the pressure of the constant pressure device is regulated to be 1-5MPa lower than the experimental pressure, the seepage liquid contained in the intermediate container is subjected to pressure compensation through the gas in the high-pressure gas cylinder.
12. The method according to claim 6 or 7, wherein step (4) is: and (3) the pressure of the constant pressure device is up-regulated to be 1-5MPa higher than the experimental pressure, and then the seepage liquid after pressure compensation in the intermediate container in the step (3) is introduced into the core holder.
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