CN111855522A - Rock core holder, high-temperature and high-pressure rock core spontaneous imbibition experimental device and method - Google Patents
Rock core holder, high-temperature and high-pressure rock core spontaneous imbibition experimental device and method Download PDFInfo
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- CN111855522A CN111855522A CN201910344368.2A CN201910344368A CN111855522A CN 111855522 A CN111855522 A CN 111855522A CN 201910344368 A CN201910344368 A CN 201910344368A CN 111855522 A CN111855522 A CN 111855522A
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- 239000011435 rock Substances 0.000 title claims abstract description 66
- 238000005213 imbibition Methods 0.000 title claims abstract description 63
- 230000002269 spontaneous effect Effects 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 21
- 239000007788 liquid Substances 0.000 claims abstract description 105
- 238000002474 experimental method Methods 0.000 claims abstract description 40
- 238000006073 displacement reaction Methods 0.000 claims abstract description 16
- 239000010779 crude oil Substances 0.000 claims abstract description 11
- 239000012530 fluid Substances 0.000 claims description 14
- 238000007789 sealing Methods 0.000 claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 238000012360 testing method Methods 0.000 claims description 4
- 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
- 238000005325 percolation Methods 0.000 claims 1
- 238000005259 measurement Methods 0.000 description 8
- 230000008569 process Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 239000003921 oil Substances 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 239000012466 permeate Substances 0.000 description 4
- 238000005303 weighing Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000691 measurement method Methods 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 230000008595 infiltration Effects 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
- 230000035699 permeability Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 238000002791 soaking 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
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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
- G01N13/04—Investigating osmotic effects
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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
- 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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Abstract
The invention provides a rock core holder, a high-temperature and high-pressure rock core spontaneous imbibition experimental device and a method, wherein the method comprises the steps of placing a target rock core in the rock core holder, building the high-temperature and high-pressure rock core spontaneous imbibition experimental device according to a corresponding connection relation, and adjusting the temperature of a thermostat to an experimental temperature; setting the pressure of the back pressure control device as a target pressure experiment pressure; after the pressure of the constant pressure device is adjusted 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, the seepage liquid after pressure compensation in the middle container is introduced into the rock core holder, gas is generated at the end of the metering pipe, the amount of crude oil sucked out by seepage is metered after the gas is emptied, and the seepage liquid is stopped being introduced; and starting the high-pressure displacement pump, introducing the seepage liquid contained in the seepage liquid storage tank into the core holder, and metering the crude oil amount sucked out by seepage through the metering pipe.
Description
Technical Field
The invention relates to a rock core holder, a high-temperature high-pressure rock core spontaneous imbibition experimental device and a method, and belongs to the technical field of petroleum exploration and development and oil reservoir engineering.
Background
At present, in petroleum engineering experimental methods, an imbibition experiment is a main method for researching reservoir wettability and an imbibition displacement process, and at present, two main measurement methods are provided, namely a weighing method and an imbibition bottle measurement method.
The schematic structure of the weighing method measurement principle and the used device is shown in fig. 1, and as can be seen from fig. 1, the device comprises a fixed frame 1, a lifting rope 2, a core 3, a beaker 4 and a balance 5: the method comprises the steps of soaking a rock core into water in a beaker, measuring the weight of the beaker at different moments through a balance, and obtaining the amount of oil sucked out through the ratio of the weight change of the beaker to the density difference of oil and water.
The schematic structural diagram of the imbibition bottle measuring principle and the device used in the same is shown in fig. 2, and as can be seen from fig. 2, the device comprises an imbibition bottle 6, a rock core 3, a rock core frame 7 and a sealing base 8: the method is that the rock sample is put into the infiltration bottle and filled with water, and the crude oil which is infiltrated out is concentrated to the narrow opening by buoyancy and is measured.
It can be seen from the two experimental methods that the experiment must be performed under normal pressure due to the equipment conditions, and the experiment is difficult to complete at higher temperature. Since the imbibition experiment is for reducing the imbibition process under the formation conditions, the closer the experimental conditions are to the formation conditions, the more perfect the experiment. The depth of the tight sandstone stratum is more than 2000 m, the stratum pressure is more than 20MPa, and the temperature is more than 60 ℃ to 100 ℃, so that 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 tight reservoir development, so that the establishment of a set of spontaneous imbibition experimental method and device for a high-temperature high-pressure rock core 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.
The invention also aims to provide a spontaneous imbibition experimental device for the high-temperature and high-pressure core, wherein the device comprises the core holder.
The invention further aims to provide a spontaneous imbibition experimental method for the high-temperature and high-pressure rock core, wherein the experimental method utilizes the spontaneous imbibition experimental device for the high-temperature and high-pressure rock core.
In order to achieve the above object, in one aspect, the present invention provides a core holder, wherein the core holder comprises a cylinder body with openings at two 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, is positioned inside the cylinder body and is 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 the lower cover body is provided with a hollow liquid inlet for communicating the outside with the core fixing device;
a cavity is formed between the bottom of the upper cover body and the core fixing device, the lower cover body is in contact with the core fixing device to support the core fixing device, and the top of the lower cover body extends into the hollow core of the core fixing device and is in contact with a target core, so that the position of the target core is fixed.
According to an embodiment of the present invention, in the core holder, preferably, 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 holding device.
Wherein, a conical cavity is formed between the bottom of the upper cover body and the core fixing device, so that crude oil seeped out from the core can be conveniently collected and discharged.
In the core holder according to the embodiment of the present invention, preferably, the top of the lower cover body has a tapered structure.
Wherein, the top of lower lid is the toper structure can avoid rock core and lower lid large tracts of land contact, influences the imbibition process.
In the core holder according to an embodiment of the present invention, preferably, the seal structure includes a seal ring.
In the core holder according to an 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 body and the lower cover body are all made of stainless steel.
In the embodiment of the invention, the wall thickness of the cylinder body can be determined according to the pressure bearing size.
According to a specific embodiment of the invention, in the core holder, the core holding device has a spiral structure inside, and the spiral structure has the following 3 functions:
1. fixing a core: in the experiment, the rock core is fixed in the rock core holder and cannot be displaced or turned over;
2. flow guiding function: the fluid rises along the spiral pore channel, which is beneficial to the directional flow of the seepage liquid;
3. the flushing capacity is increased: due to the spiral structure, the flow profile is reduced, so that 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 favorably carried and metered, and the experiment precision is increased.
The working principle of the core holder provided by the invention is as follows:
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 rock core to generate the imbibition effect, and the imbibition fluid is carried out the measurement after being carried out of the rock core holder by the injected experimental fluid.
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 pressurization unit, a rock core holding unit and an outlet control and metering unit;
the core holding unit comprises the core holder and a thermostat 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 pipe, 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 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 a 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 rock 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 the experimental set-up according to the present invention, the metering tube used is conventional equipment used in the art, and in one embodiment of the present invention, the metering tube may be an inverted funnel-shaped collector with an open top.
According to a specific embodiment of the invention, in the high-temperature and high-pressure spontaneous imbibition experimental device for the rock core, the high-pressure displacement pump is used for absorbing the seepage liquid from the beaker at a certain flow rate in the experimental process, pressurizing the seepage liquid and then circularly injecting the seepage liquid into the rock core holder, so that the seepage liquid circularly flows in the rock core holder at a certain pressure, and carrying out imbibition and carrying out measurement on the fluid absorbed by the seepage liquid in the metering tube.
In the experimental process, after the rock core is put into the rock core holder, the interior of the rock core holder is in a low-pressure state, and in order to achieve a high-pressure state, pressure must be supplemented. In the specific embodiment of the invention, the characteristic of quick gas pressurization is utilized, firstly, gas is adopted to realize pressurization in the core holder, and then gas is utilized to displace seepage liquid contained in the intermediate container 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 spontaneous imbibition experimental device for the high-temperature and high-pressure rock core, the rock core holder is mainly used for fixing the rock core, providing an imbibition space and an imbibition liquid flow channel, and the thermostat is used for providing a constant temperature condition.
According to the specific embodiment of the invention, when the core holder forms high pressure, seepage liquid, seepage sucked fluid and gas flow out through the back pressure control device, and the back pressure control device achieves the purpose of controlling the pressure environment in the core holder by controlling the pressure of the liquid outlet of the core holder; the fluid (seepage liquid, seepage-sucked fluid and gas) flowing out of the core holder is separated in the metering tube, the metering tube is an inverted funnel-shaped collector with an open top end, the flowing-out gas is released from the top end after being separated, and the seepage-sucked fluid (oil) is gathered at the top of the metering tube, so that the metering purpose is achieved.
In another aspect, the present invention further provides a high temperature and high pressure core spontaneous imbibition experimental method, wherein the high temperature and high pressure core spontaneous imbibition experimental method uses the above high temperature and high pressure core spontaneous imbibition experimental apparatus, and the experimental method includes the following steps:
(1) placing a target rock core in a rock core holder, then building the high-temperature and high-pressure rock core spontaneous imbibition experimental device according to the corresponding connection relation, and adjusting the temperature of the constant temperature box to the 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 adjusted 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) adjusting the pressure of the constant pressure device to be slightly higher than the experimental pressure, introducing the seepage liquid subjected to pressure compensation in the intermediate container in the step (3) into the core holder, wherein gas is produced at the measuring pipe end, measuring the amount of crude oil sucked out after the gas is exhausted, and stopping introducing the seepage liquid;
(5) and starting the high-pressure displacement pump, introducing the seepage liquid contained in the seepage liquid storage tank into the core holder, and metering the crude oil amount sucked out by seepage through the metering pipe.
Preferably, when the permeate liquid is the sole medium, the method further comprises the step of separating the permeate liquid entering the metering tube and then feeding the separated permeate liquid to a permeate liquid storage tank or an intermediate container for recycling.
When the seepage liquid is a single medium, such as water, the seepage liquid is separated in the metering pipe and is combined with the seepage liquid in the seepage liquid storage tank or the intermediate container for recovery, and then the seepage liquid can be injected into the core holder again, so that the aim of circular injection is fulfilled.
According to a particular embodiment of the invention, in the experimental method, preferably, the seepage liquid is water.
According to a particular embodiment of the invention, in the experimental method, preferably, the experimental pressure is between 10 and 30 MPa.
According to a specific embodiment of the present invention, in the experimental method, preferably, the experimental temperature is between room temperature and 90 ℃.
According to a specific embodiment of the present invention, in the experimental method, preferably, the step (3) is: and after the pressure of the constant pressure device is adjusted 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, the step (4) is: and (4) increasing the pressure of the constant pressure device to be 1-5MPa higher than the experimental pressure, and introducing the seepage liquid subjected to pressure compensation in the intermediate container in the step (3) into the rock core holder.
The rock core holder, the high-temperature and high-pressure rock core spontaneous imbibition experimental method and the device provided by the invention well solve the problem of imbibition measurement of the rock core under high temperature and high pressure, so that the imbibition measurement experimental conditions are more in line with 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 needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic diagram of the measurement principle of the prior art weighing method and the structure of the device used in the prior art.
FIG. 2 is a schematic diagram of the measuring principle and the structure of the device used in the prior art of the imbibition bottle.
Fig. 3 is a schematic structural view of the core holder provided in an embodiment of the present disclosure.
Fig. 4 is a schematic structural diagram of the spontaneous imbibition experimental apparatus for a high-temperature and high-pressure core provided in the embodiment of the invention.
FIG. 5 is a graph showing the results of the imbibition test at high temperature and high pressure provided in the examples of the present invention compared with the results of the conventional imbibition test in the comparative examples.
The main reference numbers illustrate:
0. a core holder;
1. a fixed mount;
2. a lifting rope;
3. a core;
4. a beaker;
5. a balance;
6. a imbibition bottle;
7. a core frame;
8. sealing the base;
9. an upper cover body;
10. a cylinder body;
11. a core fixing device;
12. a lower cover body;
13. a high pressure displacement pump;
14. a seepage liquid storage tank;
15. a back pressure control device;
16. a metering tube;
17. a thermostat;
18. a constant pressure device;
19. a high pressure gas cylinder;
20. an intermediate container.
Detailed Description
In order to clearly understand the technical features, objects and advantages of the present invention, the following detailed description of the technical solutions of the present invention will be made with reference to the following specific examples, which should not be construed as limiting the implementable scope of the present invention.
Example 1
The embodiment provides a core holder, the structural schematic diagram of which is shown in fig. 3, and as can be seen from fig. 3, the core holder comprises a cylinder body 10 with openings at two ends, a core fixing device 11, an upper cover body 9 and a lower cover body 12;
The core fixing device 11 is a hollow cylinder with a spiral structure inside, is positioned inside the cylinder body 10, and is used for fixing 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 body 12 is hermetically connected with the lower end opening of the cylinder body 10 through a sealing structure (such as a sealing ring, not shown in the figure), and the lower cover body 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 in contact 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 hollow of the core fixing device 11 and is in contact with the target core 3;
in this embodiment, the bottom of the upper cover 9 is an inverted cone-shaped structure, so that a tapered 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 is a cone-shaped 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 lid 9, and the lower lid 12 are made of stainless steel.
Example 2
The embodiment provides a spontaneous imbibition experimental apparatus of high temperature and high pressure rock core, wherein, the structural schematic diagram of the spontaneous imbibition experimental apparatus of high temperature and high pressure rock core is shown in fig. 4, and as can be seen from fig. 4, it includes: the device comprises a displacement unit, a pressurization unit, a rock core holding unit and an outlet control and metering unit;
the core holding unit comprises a core holder 0 provided by the embodiment and a constant temperature box 17 for placing the core holder, the outlet control and metering unit comprises a back pressure control device 15, an 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 a 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 rock 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 seepage liquid storage tank is a beaker.
Example 3
The embodiment provides a spontaneous imbibition experimental method for a high-temperature and high-pressure core, wherein the spontaneous imbibition experimental method for the high-temperature and high-pressure core utilizes the spontaneous imbibition experimental device for the high-temperature and high-pressure core provided in embodiment 2, a target core used for the experiment is a 7-reservoir outcrop parallel sample with an Ordos basin length, the length of the rock sample is 5cm, the diameter of the rock sample is 2.5cm, the permeability of the rock sample is 0.15mD, the porosity of the rock sample is 10.5%, and the oil saturation of the saturated kerosene in the core is 51%. The experimental temperature is 60 ℃ and the experimental pressure is 11 MPa.
The experimental method comprises the following steps:
(1) placing a target rock core saturated with crude oil in a rock core holder, then building the high-temperature and high-pressure rock core spontaneous imbibition experimental device according to a corresponding connection relation, and adjusting the temperature of a constant temperature box to 60 ℃;
(2) setting the pressure of the back pressure control device to be 11 MPa;
(3) after the pressure of the constant pressure device is adjusted 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) Adjusting the pressure of the constant pressure device to 12MPa, introducing the seepage liquid subjected to pressure compensation in the intermediate container in the step (3) into the core holder, wherein gas is produced at the metering pipe end, and after the gas is exhausted, starting to meter the amount of crude oil sucked out and stopping introducing the seepage liquid;
(5) and starting the high-pressure displacement pump, introducing the seepage liquid contained in the seepage liquid storage tank into the core holder, and metering the crude oil amount sucked out by seepage through the metering pipe.
In this embodiment, the seepage liquid is water, and therefore the method further comprises the operation of separating the seepage liquid entering the metering tube and then sending the separated seepage liquid to a seepage liquid storage tank or an intermediate container for recycling.
Comparative example 1
The same core as that in example 3 was subjected to an imbibition flooding test using an imbibition experiment conventionally used in the art. The target core used in this comparative example was the same as the core used in example 3, with the experimental temperature being room temperature and the experimental pressure being atmospheric.
Among them, experimental data obtained in inventive example 3 and comparative example 2 are shown in table 1 below.
TABLE 1
A comparison graph of the experimental result obtained by the imbibition experiment under high temperature and high pressure provided in example 3 of the present invention and the experimental result obtained by the conventional imbibition experiment in comparative example 2 is shown in fig. 5, and it can be seen from fig. 5 that since the experimental pressure and the experimental temperature adopted by the spontaneous imbibition experimental method for a core under high temperature and high pressure provided by the present invention are higher pressure and higher temperature, compared with the conventional imbibition experiment in the art, the temperature and the pressure thereof are changed, which also causes the imbibition curve to be shifted.
Therefore, the core holder, the high-temperature and high-pressure core spontaneous imbibition experimental method and the device provided by the invention can well solve the problem of core imbibition measurement under high temperature and high pressure, so that the imbibition measurement experimental conditions are more in line with field conditions.
The above description is only exemplary of the invention and should not be taken as limiting the scope of the invention, so that the invention is intended to cover all modifications and equivalents of the embodiments described herein. In addition, the technical features and the technical inventions of the present invention, the technical features and the technical inventions, and the technical inventions can be freely combined and used.
Claims (16)
1. A rock core holder is characterized by comprising a cylinder body with openings at two ends, a rock 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, is positioned inside the cylinder body and is 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 the lower cover body is provided with a hollow liquid inlet for communicating the outside with the core fixing device;
A cavity is formed between the bottom of the upper cover body and the core fixing device, the lower cover body is in contact with the core fixing device to support the core fixing device, and the top of the lower cover body extends into the hollow core of the core fixing device and is in contact with a target core.
2. The core holder as recited in claim 1, wherein the bottom of the upper cover is of an inverted conical configuration such that a tapered cavity is formed between the bottom of the upper cover and the core holding device.
3. The core holder as recited in claim 1, wherein a top of the lower cover body is of a tapered configuration.
4. The core holder as recited in claim 1, wherein the sealing structure comprises a seal ring.
5. The core holder as recited in claim 1, wherein the fluid inlet is a T-configuration fluid inlet.
6. The core holder as recited in claim 1, wherein the core holder is made of plastic.
7. The core holder as recited in any one of claims 1-6, wherein the cylinder, the upper cover and the lower cover are all made of stainless steel.
8. The utility model provides a spontaneous imbibition experimental apparatus of high temperature high pressure rock core which characterized in that, spontaneous imbibition experimental apparatus of high temperature high pressure rock core includes: the device comprises a displacement unit, a pressurization unit, a rock core holding unit and an outlet control and metering unit;
The core holding unit comprises a core holder according to any one of claims 1 to 7 and a thermostat for placing the core holder, the outlet control and metering unit comprises a back pressure control device, an seepage liquid storage tank and a metering pipe, 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 a 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 rock 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.
9. The testing device of claim 8, wherein said seepage liquid reservoir is a beaker.
10. A spontaneous imbibition experimental method for a high-temperature and high-pressure rock core, which is characterized in that the spontaneous imbibition experimental method for the high-temperature and high-pressure rock core utilizes the spontaneous imbibition experimental device for the high-temperature and high-pressure rock core according to claim 8 or 9, and the experimental method comprises the following steps:
(1) placing a target rock core in a rock core holder, then building the high-temperature and high-pressure rock core spontaneous imbibition experimental device according to the corresponding connection relation, and adjusting the temperature of the constant temperature box to the 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 adjusted 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) adjusting the pressure of the constant pressure device to be slightly higher than the experimental pressure, introducing the seepage liquid subjected to pressure compensation in the intermediate container in the step (3) into the core holder, wherein gas is produced at the measuring pipe end, measuring the amount of crude oil sucked out after the gas is exhausted, and stopping introducing the seepage liquid;
(5) and starting the high-pressure displacement pump, introducing the seepage liquid contained in the seepage liquid storage tank into the core holder, and metering the crude oil amount sucked out by seepage through the metering pipe.
11. The experimental method according to claim 10, wherein when the seepage liquid is a single medium, the method further comprises an operation of separating the seepage liquid entering the metering pipe and then sending the separated seepage liquid to a seepage liquid storage tank or an intermediate container for recycling.
12. The experimental method according to claim 10 or 11, characterized in that said percolation liquid is water.
13. The experimental method according to claim 10 or 11, characterized in that said experimental pressure is comprised between 10 and 30 MPa.
14. The experimental method according to claim 10 or 11, characterized in that the experimental temperature is between room temperature and 90 ℃.
15. The assay method according to claim 10 or 11, wherein step (3) is: and after the pressure of the constant pressure device is adjusted 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.
16. The assay method according to claim 10 or 11, wherein step (4) is: and (4) increasing the pressure of the constant pressure device to be 1-5MPa higher than the experimental pressure, and introducing the seepage liquid subjected to pressure compensation in the intermediate container in the step (3) into the rock core holder.
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