CN112782205A - High-temperature and high-pressure resistant X-CT scanning long core displacement device for analyzing crude oil distribution of oil-gas reservoir - Google Patents
High-temperature and high-pressure resistant X-CT scanning long core displacement device for analyzing crude oil distribution of oil-gas reservoir Download PDFInfo
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Abstract
The invention discloses a high-temperature and high-pressure resistant X-CT scanning long core displacement device for analyzing crude oil distribution of an oil and gas reservoir, which comprises: the device comprises an X-CT scanner (20), a long core holder (25), a sample preparation injection assembly, a sample fluid injection assembly, an adjustable heater (26) and a gas meter (41). The invention can effectively reduce the external temperature of the long core holder (25) and the risk of scalding experimenters; in the displacement process, each displacement stage of the long core holder (25) can be scanned, so that the crude oil distribution condition in the displacement process can be visually observed, the displacement effect of the displacement mode and the effect of inhibiting the water cone can be conveniently analyzed, guidance can be provided for the exploitation effect of the exploitation mode of oil and gas in the exploitation process, and particularly for a long core simulation experiment of a large-bottom water-thin oil ring condensate gas reservoir, the device can effectively observe the amount of water intrusion into an oil ring and an oil ring intrusion into a gas cap in the exploitation process.
Description
Technical Field
The invention relates to the technical field of petroleum and natural gas exploration and development, in particular to a high-temperature and high-pressure resistant X-CT scanning long core displacement device for analyzing crude oil distribution of an oil-gas reservoir.
Background
The phenomena of bottom water coning, oil ring oil invasion to gas cap and complex oil-gas-water flow characteristics are usually existed in the oil-gas reservoir during the production process. Bottom water coning is not beneficial to oil and gas exploitation, so that the oil and gas recovery rate is reduced; for a condensate gas reservoir, failure exploitation is generally performed at the early stage, condensate oil precipitated by condensation can form an oil ring after the pressure of the reservoir is reduced, the oil ring oil invades a gas cap due to the reduction of the pressure, the saturation of the condensate oil invading the gas cap is reduced, the condensate oil is adsorbed on the wall surface of a rock and is difficult to extract, and the extraction degree of crude oil is reduced; the oil gas reservoir has complex oil gas-water flow characteristics in the production process, cannot visually analyze and analyze the oil gas and oil-water distribution conditions, and is not beneficial to the improvement of the oil gas recovery rate.
The existing long core displacement experiment for simulating the exploitation of an oil and gas reservoir can only observe the exploitation degree of oil, gas and water, cannot observe the distribution condition of crude oil in the long core, can only simply analyze the exploitation effect of the exploitation method from the ultimate exploitation degree of the oil, gas and water, and cannot analyze the distribution condition of residual oil. The existing long core experiment device is mainly divided into two types, one type is that a long core holder is placed in a horizontal or slightly inclined angle in an oven, the long core displacement device can carry out high-temperature and high-pressure experiments and simulation experiments of horizontal or slightly inclined angle anticline strata, residual oil distribution analysis and bottom water coning inhibition effect analysis cannot be carried out, and meanwhile, when the high-temperature and high-pressure simulation experiments are carried out, experimenters need to enter the oven for pipeline switching, and workers are easily scalded; the other type is that long rock core holder outside is equipped with the heating jacket, can carry out high temperature high pressure experiment and the great anticline stratum simulation experiment in inclination, can not carry out remaining oil distribution analysis, and the experimental temperature is difficult to stably, can only fluctuate in a temperature range, is not suitable for condensate gas reservoir simulation experiment, because the change of the inside temperature of long rock core holder and pressure is caused easily in the unstability of temperature, leads to the condensate gas reservoir to take place the anti-condensation phenomenon, is unfavorable for oil and gas exploitation.
Chinese patent with patent publication No. CN210322723U discloses a long rock core gas injection displacement experimental apparatus, but this patent technical scheme still can't carry out stable control to the temperature and the pressure of experiment, can't adjust experiment inclination, also can't observe the inside crude oil distribution of long rock core, and experiment effect and efficiency are not good.
Therefore, how to improve the temperature and pressure stability of the simulation oil and gas reservoir long core displacement experiment and avoid the phenomenon of reverse condensation is a technical problem to be solved urgently.
The above is only for the purpose of assisting understanding of the technical aspects of the present invention, and does not represent an admission that the above is prior art.
Disclosure of Invention
The invention mainly aims to provide a high-temperature and high-pressure resistant X-CT scanning long core displacement device for analyzing crude oil distribution of an oil-gas reservoir, and aims to solve the technical problems that the temperature and the pressure of an experiment cannot be stably controlled, the inclination angle of the experiment cannot be adjusted, the crude oil distribution in a long core cannot be observed, and the experiment effect and the efficiency are poor in the prior art.
In order to achieve the purpose, the invention provides a high-temperature and high-pressure resistant X-CT scanning long core displacement device for analyzing crude oil distribution of an oil-gas reservoir, which specifically comprises the following steps:
the device comprises an X-CT scanner and a long rock core holder fixedly arranged on a conveying shaft of the X-CT scanner;
the sample preparation injection assembly comprises a sample preparation device and a sample preparation device pressurizing displacement pump which are connected with the inlet end of the long core holder, and gas samples and oil samples are injected into the long core holder;
the sample fluid injection assembly comprises a simulated oil intermediate container, a simulated formation water intermediate container, a nitrogen intermediate container, a dry gas intermediate container and a sample fluid displacement pump, wherein the simulated oil intermediate container is connected with the outlet end of the long core holder, the dry gas intermediate container is connected with the inlet end of the long core holder, and the sample fluid displacement pump is respectively connected with the simulated oil intermediate container, the simulated formation water intermediate container, the nitrogen intermediate container and the dry gas intermediate container, and is used for injecting sample fluid into the long core holder;
the adjustable heater is connected with an outlet end pipeline and an inlet end pipeline of the long core holder and used for adjusting the experiment temperature in the long core holder;
and the gas meter is connected with the outlet end of the long core holder and is used for metering the gas extracted and separated by the long core holder.
Optionally, the long core holder comprises:
the device comprises a holder outer tube, wherein a holder end cover is arranged at the inlet end of the holder outer tube, and a displacement inlet and a confining pressure inlet are arranged on the holder end cover; the outlet end of the outer tube of the holder is provided with a displacement outlet and a confining pressure outlet end plug connected with the displacement outlet;
the heat shrink tube is arranged in the outer tube of the clamp, and the outside of the heat shrink tube and the inside of the outer tube of the clamp form a confining pressure space communicated with the confining pressure inlet; the heat shrinkable tube is wrapped by an experimental rock core and internal pressure inlet end plugs and internal pressure outlet end plugs at two ends of the heat shrinkable tube to form an internal pressure space communicated with the displacement inlet.
Optionally, a double-thread internal pressure outlet PK plug connected with the confining pressure outlet end plug and the internal pressure outlet end plug is arranged between the confining pressure outlet end plug and the internal pressure outlet end plug.
Optionally, the outside parcel of pyrocondensation pipe has carbon fiber heating jacket and sets up the insulating insulation cover between carbon fiber heating jacket and holder outer tube, the carbon fiber heating jacket connects the exit end pipeline and the entry end pipeline of long rock core holder respectively.
Optionally, the internal pressure inlet end plug is provided with a temperature probe connected with a carbon fiber heating sleeve, the carbon fiber heating sleeve is connected with a temperature detection line for detecting the internal temperature of the long core holder, and the temperature probe transmits temperature parameters to external equipment through a temperature detection joint arranged on an end cover of the holder.
Optionally, the high-temperature and high-pressure resistant X-CT scanning long core displacement device for analyzing crude oil distribution of the oil and gas reservoir further comprises a confining pressure sensor and a display which are arranged on the long core holder and connected with the confining pressure inlet, and a temperature pressure sensor and a display which are connected with the temperature detection joint.
Optionally, an inlet end rubber sealing ring and an outlet end rubber sealing ring are respectively arranged at the inlet end and the outlet end of the outer tube of the holder, and the inner space of the long core holder is sealed.
Optionally, insulating filter sheets for eliminating a terminal effect and filtering impurities are arranged between the internal pressure inlet end plug and the experimental rock core, between the internal pressure outlet end plug and the experimental rock core, and in the experimental rock core.
Optionally, an angle adjusting structure for adjusting the angle of the long core holder is arranged on the transmission shaft of the X-CT scanner.
Optionally, a sample preparation cylinder is arranged in the sample preparation device, a piston for separating the sample preparation cylinder into a sample end and a hydraulic oil end is arranged in the sample preparation cylinder, the sample end is connected with the long core holder through an outlet of the sample preparation device, and the hydraulic oil end is connected with a pressurizing displacement pump of the sample preparation device through an inlet of the sample preparation device.
Optionally, the high-temperature and high-pressure resistant X-CT scanning long core displacement device for analyzing crude oil distribution of the oil-gas reservoir further comprises a gas-liquid separator arranged between the long core holder and the gas meter.
Optionally, the high-temperature and high-pressure resistant X-CT scanning long core displacement device for analyzing crude oil distribution of the oil and gas reservoir further comprises a back pressure valve arranged between the nitrogen intermediate container and the long core holder, and the back pressure valve is used for controlling the liquid production or gas production speed at the outlet end of the long core holder.
According to the invention, the assembly and disassembly are convenient, the arrangement angle of the long core holder can be adjusted, and the operability and flexibility of the experiment are improved; the long core holder is internally heated, insulated and insulated, so that the external temperature of the long core holder and the risk of scalding experimenters are effectively reduced; in the displacement process of the long rock core holder, each displacement stage can be scanned, so that the crude oil distribution condition in the displacement process can be visually observed, the displacement effect of the displacement mode and the effect of inhibiting the water coning can be conveniently analyzed, guidance can be provided for the exploitation effect of an exploitation mode of an oil gas reservoir in the exploitation process, particularly for a long rock core simulation experiment of a large-bottom water-thin oil ring condensate gas reservoir, the device can effectively observe the amount of water intrusion into an oil ring and the amount of oil ring intrusion into a gas top in the exploitation process, and the effect of inhibiting the retrograde condensation and the bottom water coning in the exploitation method can be analyzed, and an optimal exploitation scheme can be obtained. The technical problems that the temperature and the pressure of an experiment cannot be stably controlled, the experiment inclination angle cannot be adjusted, the crude oil distribution in a long rock core cannot be observed, and the experiment effect and the efficiency are not good in the prior art are solved.
Drawings
FIG. 1 is a schematic structural diagram of a high-temperature and high-pressure resistant X-CT scanning long core displacement device.
Fig. 2 is an experimental schematic of a long core holder of the present invention.
The reference numbers illustrate:
1-a displacement inlet; 2-temperature detecting joint; 3-confining pressure inlet; 4-temperature probe; 5-a gripper end cap; 6-inlet end rubber sealing ring; 7-temperature detection line; 8-clamp outer tube; 9-inner pressure inlet end plug; 10-experimental core; 11-internal pressure outlet end plug; 12-a displacement outlet; 13-outlet end rubber sealing ring; 14-confining pressure outlet end plug; 15-insulating filter sheet; 16-insulating thermal insulation sleeve; 17-a carbon fiber heating jacket; 18-confining pressure annular space; 19-a double-thread internal pressure outlet PK plug; a 20-X-CT scanner; 21-confining pressure displacement pump; 22-confining pressure sensor and display; 23-temperature pressure sensor and display; 24-three-way valve; 25-long core holder; 26-an adjustable heater; 27-dry gas intermediate container; 28-pressure gauge; 29-high pressure manual control valve; 30-sample outlet end of sample matching device; 31-sample injector hydraulic oil inlet port; 32-sample dispenser temperature pressure display; 33-sample preparation device; 34-sample preparation device pressurizing displacement pump; a 35-X-CT scanner transport shaft; 36-simulated oil and simulated formation water pressurization displacement pump; 37-simulated oil intermediate container; 38-simulated formation water intermediate container; 39-a back pressure valve; 40-a gas-liquid separator; 41-gas meter; 42-nitrogen intermediate vessel; 43-Nitrogen pressurization displacement pump.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a high-temperature and high-pressure resistant X-CT scanning long core displacement device according to an embodiment of the present invention.
In this embodiment, a high temperature and high pressure resistant X-CT scanning long core displacement device for analyzing crude oil distribution of an oil and gas reservoir consists of an X-CT scanner 20, a displacement pump set (confining pressure displacement pump 21, sample preparation and dry gas pressurizing displacement pump 34, simulated oil and simulated formation water pressurizing displacement pump 36, nitrogen pressurizing displacement pump 43), a confining pressure sensor and display 22, a temperature sensor and display 23, a three-way valve 24, a long core holder 25, an adjustable heater 26, an intermediate container set (dry gas intermediate container 27, simulated oil intermediate container 37, simulated formation water intermediate container 38, nitrogen intermediate container 42), a pressure gauge 28, a high pressure manual control valve 29, a sample preparation set (sample preparation outlet end 30, sample preparation hydraulic oil inlet end 31, sample preparation temperature pressure 32, sample preparation 33), an X-CT scanner transmission shaft 35, a back pressure valve 39, a gas-liquid separator 40, A gas meter 41.
Referring to fig. 2, fig. 2 is an experimental schematic diagram of a long core holder according to an embodiment of the present disclosure.
It should be noted that the long core holder 25 is an internal heating high temperature and high pressure resistant 160 ℃/80MPa aluminum alloy long core holder and is composed of an inlet and outlet end pipeline, a displacement inlet 1, a temperature detecting joint 2, a confining pressure inlet 3, a temperature probe 4, a holder end cover 5, an inlet end rubber sealing ring 6, a temperature detecting line 7, a holder outer pipe 8, an internal pressure inlet end plug 9, an experimental core 10 wrapped by a heat shrinkable pipe, an internal pressure outlet end plug 11, a displacement outlet 12, an outlet end rubber sealing ring 13, a confining pressure outlet end plug 14, an insulating filter sheet 15, an insulating sleeve 16, a carbon fiber heating sleeve 17, a confining pressure annular space 18 and a double-thread internal pressure outlet PK plug 19.
It is to be understood that the inlet and outlet lines of the long core holder 25 are used for connection with external devices; the high-temperature-resistant heat-shrinkable tube wraps the rock core and the internal pressure inlet and outlet end plug and is used for isolating an internal pressure interval from a confining pressure interval, an internal pressure space is formed inside the heat-shrinkable tube, and a confining pressure space is formed outside the heat-shrinkable tube and inside the outer tube 8 of the holder; the inlet and outlet end rubber sealing rings are used for sealing the inner space of the clamp holder; the insulating filter sheets 15 are arranged between the rock core and between the internal pressure inlet/outlet end plug and the rock core and are used for filtering impurities and eliminating the end effect; the carbon fiber heating sleeve 17 is wrapped outside the heat shrinkable tube, is not connected with the plug at the inlet and outlet end of the internal pressure, and is used for heating the core after being conductive; the insulating heat-insulating sleeve 16 is used for insulating the heated core, and simultaneously separates the carbon fiber heating sleeve 17 from the holder outer tube 8, so that a conductive loop is prevented from being formed, and the external temperature of the holder is prevented from being too high; the double-thread internal pressure outlet PK plug 19 is used for connecting the internal pressure outlet plug 11 and the confining pressure outlet plug, and the confining pressure outlet end plug 14 adopts a confining pressure outlet end polytetrafluoroethylene insulation plug to ensure the tightness of internal pressure and confining pressure; the confining pressure outlet end PK plug 14 is used for ensuring the confining pressure sealing performance and fixing an outlet end pipeline, and the end cover 5 of the clamp is in a threaded screwing type, so that the confining pressure sealing and the disassembly and assembly are facilitated; the temperature probe 4 is positioned at the inner pressure inlet end plug 9 and is connected with a temperature detecting sheet on the carbon fiber heating sleeve 17 through an external insulated copper wire for detecting the internal temperature of the holder.
In the specific implementation, the internal heating type aluminum alloy long core holder 25 is fixed on a conveying shaft 35 of an X-CT scanner and can be adjusted in angle, the X-CT scanner 25 is used for scanning the long core holder 25 to obtain a crude oil distribution scanning diagram in the core in the long core holder 25, and a temperature probe 4 on the X-CT scanner is connected with a temperature sensor and a display 23 and is used for displaying the internal temperature of the long core holder 25.
It should be noted that two heating wires (external insulation) of the adjustable heater 26 are respectively fixed to the inlet/outlet end lines of the internal heating aluminum alloy long core holder 25, and the temperature rise speed is controlled by adjusting the voltage and current. The confining pressure displacement pump 21 is connected with a confining pressure inlet 3 of the internal heating type aluminum alloy long core holder 25, and confining pressure is applied to the internal heating type aluminum alloy long core holder 25 through injecting hydraulic oil.
It should be noted that the sample preparation device and the dry gas pressurizing displacement pump 34 and the hydraulic oil end of the sample preparation device 33 inject the sample at the other end of the sample preparation device 33 or the dry gas of the dry gas intermediate container 27 into the internal heating aluminum alloy long core holder 25 through the internal pressure inlet/outlet end thereof by injecting the hydraulic oil, and the internal pressure is adjusted.
The simulated oil and simulated formation water pressurizing displacement pump 36 is connected with the hydraulic oil ends of the simulated oil intermediate container 37 and the simulated formation water intermediate container 38, the sample ends of the simulated oil intermediate container 37 and the simulated formation water intermediate container 38 are connected with the internal pressure inlet and outlet ends of the internal heating type aluminum alloy long core holder 25, and hydraulic oil is injected through the simulated oil and simulated formation water pressurizing displacement pump 36 to inject a sample into the internal heating type aluminum alloy long core holder 25 and perform pressure regulation.
The nitrogen pressurizing displacement pump 43 is connected with the hydraulic oil end of the nitrogen intermediate container 42, the nitrogen end is connected with the back-pressure valve 39, hydraulic oil is injected through the nitrogen pressurizing displacement pump 43, nitrogen is pressed into the back-pressure valve 39, back pressure is applied to the outlet end of the whole experimental device, the flow rate of fluid at the outlet end of the device is convenient to control, the liquid or gas production speed at the outlet end of the long core holder 25 is effectively controlled, and the phenomenon that the internal pressure of the long core holder 25 is reduced too fast is avoided.
The gas-liquid separator 40 is composed of a rubber plug and a test tube and is mainly used for separating the produced gas and liquid, and when a high-temperature experiment is carried out, the bottom of the test tube is immersed in ice water or liquid nitrogen so that the gas and the liquid are fully separated; the gas meter is used to meter the gas separated by the gas-liquid separator 40.
In the concrete implementation, the simulation experiment process of the high-temperature and high-pressure resistant X-CT scanning long core displacement device for analyzing the crude oil distribution of the oil-gas reservoir provided in the embodiment is as follows:
(1) screening an experimental rock core 10 and sequencing the rock core, sequentially loading the sequenced rock core into a heat-shrinkable tube, separating the middle part by an insulating filter sheet 15, installing internal-pressure plugs at two ends of the rock core, and packaging the rock core in the heat-shrinkable tube by using an air heater to ensure that fluid cannot flow from the side surface of the rock core.
(2) And wrapping the carbon fiber heating sleeve 17 outside the heat shrinkable tube and fixing the carbon fiber heating sleeve, so as to ensure that two ends of the carbon fiber heating sleeve 17 are not in direct contact with the internal pressure plug.
(3) The end of the temperature detecting wire 7 is embedded in the middle of the carbon fiber heating sleeve 17, and the other end of the temperature detecting wire 7 is directly connected with the temperature detecting joint 2.
(4) Wrap up insulating insulation cover 16 in carbon fiber heating jacket 17 outside to guarantee to wrap up completely, insulating insulation cover 16 is packed with polyimide sticky tape, with the formation of not return circuit between guaranteeing carbon fiber heating jacket 17 and the holder outer tube 8, avoid holder outer tube 8 to heat up.
(5) And (3) loading the loaded long rock core into the outer tube 8 of the holder, and screwing the holder end covers 5 at two ends.
(6) The internally heated aluminum alloy long core holder 25 is mounted on the transport shaft of the X-CT scanner 20 and the experimental angle is adjusted.
(7) And (3) connecting confining pressure and internal pressure inlet and outlet pipelines of the internal heating type aluminum alloy long core holder 25, and connecting lines of the adjustable heater 26, the pressure sensor and the temperature sensor with the internal heating type aluminum alloy long core holder.
(8) According to the experimental scheme, confining pressure is applied to the long core holder 25 through a confining pressure pressurizing displacement pump, simulated oil and simulated formation water are injected into the long core holder 25 through a simulated oil and simulated formation water pressurizing displacement pump 36, temperature rise and pressure build are carried out, gas with certain temperature and pressure is transferred into the long core holder through a sample distributor and a dry gas pressurizing displacement pump 34, and a simulated oil-gas reservoir is built.
(9) And a nitrogen pressurizing displacement pump 43 is used for pressurizing back pressure to the back pressure valve 39 (the back pressure is slightly lower than the pressure at the outlet end of the long core holder), the fluid outflow speed at the outlet end of the long core holder 25 is set, the exploitation of the oil-gas reservoir is simulated, and X-CT scanning is carried out at each displacement stage to determine the crude oil distribution condition of each displacement stage so as to judge the exploitation effect of the exploitation mode.
In this embodiment, a high temperature and high pressure resistant X-CT scanning long core displacement device for analyzing crude oil distribution in an oil and gas reservoir is provided, in which a core portion is an internal heating type high temperature and high pressure resistant aluminum alloy long core holder (X-rays easily penetrate through aluminum alloy, so as to ensure an image scanning effect). The displacement device has the advantages of sufficient material sources and simple operation, can be used for carrying out related simulation experiments on conventional oil reservoirs and gas reservoirs, and can also be used for carrying out crude oil distribution simulation exploitation experiments on the oil and gas reservoirs, particularly simulation experiments on large-bottom water-thin oil ring condensate gas reservoirs with complex fluid phase characteristics in the exploitation process, and meanwhile, the fixing device of the long core holder 25 can be adjusted to carry out long core simulation experiments at different inclination angles. In the experimental process, the X-CT scanner can be used for scanning the long core holder to observe the crude oil distribution, and meanwhile, the oil-gas water production amount is counted through the outlet end of the device, so that an effective guiding effect is provided for the development and exploitation of oil-gas reservoirs.
The foregoing is illustrative of the preferred embodiments of this invention, and it is to be understood that the invention is not limited to the precise form disclosed herein and that various other combinations, modifications, and environments may be resorted to, falling within the scope of the concept as disclosed herein, either as described above or as apparent to those skilled in the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (12)
1. The utility model provides a high temperature and high pressure resistant X-CT scans long rock core displacement device of analysis oil gas reservoir crude oil distribution which characterized in that includes:
the device comprises an X-CT scanner (20) and a long core holder (25) fixedly arranged on a transmission shaft of the X-CT scanner (20);
the sample preparation injection assembly comprises a sample preparation device (33) and a sample preparation device pressurizing displacement pump (34) which are connected with the inlet end of the core holder, and gas samples and oil samples are injected into the long core holder (25);
the sample fluid injection assembly comprises a simulated oil intermediate container (37) connected with the outlet end of the long core holder, a simulated formation water intermediate container (38), a nitrogen intermediate container (42), a dry gas intermediate container (27) connected with the inlet end of the long core holder, and a sample fluid displacement pump respectively connected with the simulated oil intermediate container (37), the simulated formation water intermediate container (38), the nitrogen intermediate container (42) and the dry gas intermediate container (27), and sample fluid is injected into the long core holder (25);
the adjustable heater (26) is connected with an outlet end pipeline and an inlet end pipeline of the long core holder (25) and used for adjusting the experiment temperature in the long core holder (25);
and the gas meter (41) is connected with the outlet end of the long core holder and is used for metering the gas extracted and separated by the long core holder.
2. The high-temperature and high-pressure resistant X-CT scanning long core displacement device for analyzing crude oil distribution of an oil and gas reservoir as claimed in claim 1, wherein the long core holder (25) comprises:
the device comprises a holder outer tube (8), wherein a holder end cover (5) is arranged at the inlet end of the holder outer tube (8), and a displacement inlet (1) and a confining pressure inlet (3) are arranged on the holder end cover (5); the outlet end of the outer tube (8) of the holder is provided with a displacement outlet (12) and a confining pressure outlet end plug (14) connected with the displacement outlet (12);
the heat shrink tube is arranged in the outer tube (8) of the clamp holder, and the outside of the heat shrink tube and the inside of the outer tube (8) of the clamp holder form a confining pressure space communicated with the confining pressure inlet (3); the heat shrinkable tube is wrapped by an experimental rock core (10) and inner pressure inlet end plugs (9) and inner pressure outlet end plugs (11) at two ends of the heat shrinkable tube to form an inner pressure space communicated with the displacement inlet (1).
3. The high-temperature and high-pressure resistant X-CT scanning long core displacement device for analyzing crude oil distribution of an oil and gas reservoir as claimed in claim 2, wherein a double-thread internal pressure outlet PK plug (19) for respectively connecting the confining pressure outlet end plug (14) and the internal pressure outlet end plug (11) is arranged between the confining pressure outlet end plug (14) and the internal pressure outlet end plug (11).
4. The long core displacement device for high-temperature and high-pressure X-CT scanning of crude oil distribution in an oil and gas reservoir according to claim 2, wherein a carbon fiber heating jacket (17) and an insulating insulation jacket (16) arranged between the carbon fiber heating jacket (17) and an outer tube (8) of the holder are wrapped outside the heat shrink tube, and the carbon fiber heating jacket (17) is respectively connected with an outlet end pipeline and an inlet end pipeline of the long core holder (25).
5. The high-temperature and high-pressure resistant X-CT scanning long core displacement device for analyzing crude oil distribution of an oil and gas reservoir according to claim 4, wherein a temperature probe (4) connected with a carbon fiber heating sleeve (17) is arranged at an inner pressure inlet end plug (9), the carbon fiber heating sleeve (17) is connected with a temperature detecting line (7) for detecting the internal temperature of the long core holder (25), and the temperature probe (4) transmits temperature parameters to external equipment through a temperature detecting joint (2) arranged on an end cover (5) of the holder.
6. The high-temperature and high-pressure resistant X-CT scanning long core displacement device for analyzing crude oil distribution of an oil and gas reservoir as claimed in claim 5, further comprising a confining pressure sensor and a display (22) which are arranged on the long core holder (25) and connected with the confining pressure inlet (3), and a temperature pressure sensor and a display (23) which are connected with the temperature detecting joint (2).
7. The high-temperature and high-pressure resistant X-CT scanning long core displacement device for analyzing crude oil distribution of an oil and gas reservoir as claimed in claim 2, wherein an inlet end rubber sealing ring (6) and an outlet end rubber sealing ring (13) are respectively arranged at the inlet end and the outlet end of the outer tube (8) of the holder to seal the inner space of the long core holder (25).
8. The high-temperature and high-pressure resistant X-CT scanning long core displacement device for analyzing crude oil distribution of an oil and gas reservoir as claimed in claim 2, wherein insulating filter sheets (15) for eliminating a terminal effect and filtering impurities are arranged between the internal pressure inlet end plug (9) and the experimental core (10), between the internal pressure outlet end plug (11) and the experimental core (10) and in the experimental core (10).
9. The high-temperature and high-pressure resistant X-CT scanning long core displacement device for analyzing crude oil distribution of an oil and gas reservoir as claimed in claim 1, wherein an angle adjusting structure for adjusting the angle of the long core holder (25) is arranged on a conveying shaft of the X-CT scanner (20).
10. The high-temperature and high-pressure resistant X-CT scanning long core displacement device for analyzing crude oil distribution of an oil and gas reservoir according to claim 1, wherein a sample distribution cylinder is arranged inside the sample distribution device (33), a piston for dividing the sample distribution cylinder into a sample end and a hydraulic oil end is arranged in the sample distribution cylinder, the sample end is connected with the long core holder (25) through an outlet of the sample distribution device (33), and the hydraulic oil end is connected with a sample distribution device pressurizing displacement pump (34) through an inlet of the sample distribution device (33).
11. The high-temperature and high-pressure resistant X-CT scanning long core displacement device for analyzing crude oil distribution of an oil and gas reservoir as claimed in claim 1, further comprising a gas-liquid separator (40) arranged between the long core holder (25) and the gas meter (41).
12. The high-temperature and high-pressure resistant X-CT scanning long core displacement device for analyzing crude oil distribution of an oil and gas reservoir as claimed in claim 1, further comprising a back pressure valve (39) arranged between the nitrogen intermediate container (42) and the long core holder (25) and used for controlling the liquid production or gas production speed at the outlet end of the long core holder (25).
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113358683A (en) * | 2021-06-11 | 2021-09-07 | 西南石油大学 | Water flooding experimental device and method for researching core end face effect |
| CN113504351A (en) * | 2021-05-20 | 2021-10-15 | 中国石油大学(北京) | Compact core displacement experimental device |
| CN113740513A (en) * | 2021-09-08 | 2021-12-03 | 安徽理工大学 | In-situ CT (computed tomography) online scanning displacement experiment system and application method |
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