CN116735835A - Compact sandstone condensate gas reservoir failure development simulation device and method - Google Patents
Compact sandstone condensate gas reservoir failure development simulation device and method Download PDFInfo
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- 238000011161 development Methods 0.000 title claims abstract description 69
- 238000004088 simulation Methods 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000006073 displacement reaction Methods 0.000 claims abstract description 35
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 29
- 239000011435 rock Substances 0.000 claims abstract description 25
- 238000012544 monitoring process Methods 0.000 claims abstract description 22
- 239000007789 gas Substances 0.000 claims description 160
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 47
- 239000007788 liquid Substances 0.000 claims description 37
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 28
- 238000002474 experimental method Methods 0.000 claims description 26
- 229910052757 nitrogen Inorganic materials 0.000 claims description 23
- 238000002347 injection Methods 0.000 claims description 22
- 239000007924 injection Substances 0.000 claims description 22
- 239000012071 phase Substances 0.000 claims description 22
- 239000007791 liquid phase Substances 0.000 claims description 18
- 239000000047 product Substances 0.000 claims description 16
- 239000003345 natural gas Substances 0.000 claims description 14
- 238000012360 testing method Methods 0.000 claims description 12
- 238000007872 degassing Methods 0.000 claims description 10
- 230000001105 regulatory effect Effects 0.000 claims description 9
- 238000001514 detection method Methods 0.000 claims description 8
- 238000004587 chromatography analysis Methods 0.000 claims description 6
- 238000013329 compounding Methods 0.000 claims description 6
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- 238000011208 chromatographic data Methods 0.000 claims description 5
- 238000001704 evaporation Methods 0.000 claims description 5
- 230000008020 evaporation Effects 0.000 claims description 5
- 238000007664 blowing Methods 0.000 claims description 2
- 238000005086 pumping Methods 0.000 claims description 2
- 239000000523 sample Substances 0.000 description 11
- 239000012530 fluid Substances 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 229910001220 stainless steel Inorganic materials 0.000 description 4
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- 238000007789 sealing Methods 0.000 description 3
- 238000009833 condensation Methods 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
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- 229910001873 dinitrogen Inorganic materials 0.000 description 1
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- 230000000694 effects Effects 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
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Abstract
The invention discloses a dense sandstone condensate gas reservoir failure development simulation device and a method, wherein the device comprises the following steps: the core holder module is arranged in the incubator; the condensate gas saturation module is connected with the inlet end of the core holder module through a first pipeline, and an upstream valve is arranged on the first pipeline; the four-way valve is connected with the outlet end of the core holder module, the downstream displacement module, the back pressure valve and the temperature and pressure monitoring module respectively; the collecting and metering module is connected with the back pressure valve; the device is provided with the upstream valve between condensate gas saturation module and rock core holder module, can distinguish condensate gas reservoir failure development simulation experiment in-process full well end and near-well end's difference to have cross valve and low reaches displacement module, can blow out the condensate oil that is attached to the pipeline wall to collecting the metering module through the displacement of low reaches displacement module, improve experimental accuracy.
Description
Technical Field
The invention belongs to the technical field of gas reservoir development, and particularly relates to a dense sandstone condensate gas reservoir failure development simulation device and method.
Background
In the development process of condensate gas failure, gas phase single-phase flow is started, condensate oil is separated out when the formation pressure is lower than the dew point pressure, and a reverse condensate phenomenon occurs, so that the reverse condensate damage is caused. The reverse condensate damage refers to the phenomenon that the effective permeability of the gas phase of a reservoir is reduced due to the fact that heavy components in the gas phase are separated out in the form of condensate oil and the pores are blocked when the formation pressure is lower than the dew point pressure in the failure development process of the condensate gas reservoir.
For the near well end, different from Quan Jingduan (whole gas reservoir), obvious difference exists in the occurrence of the reverse condensation phenomenon, and along with continuous exploitation, the condensate gas at the far well end is continuously cut off to the near well end, namely, the near well end is supplemented with the condensate gas, so that the development and the verification of the failure of the real condensate gas reservoir can be greatly influenced.
The existing condensate gas reservoir failure development simulation device is characterized in that an upstream fluid intermediate container is directly connected with the inlet end of a core holder, the core is pressurized through natural gas saturation, then condensate gas is displaced and pressed into the core, the downstream end of the core holder is directly connected with a back pressure valve, the failure development simulation is realized by adjusting the back pressure valve to change the downstream pressure during an experiment, a separated liquid is connected with a test tube for cooling and separating, condensate oil is directly collected by the test tube, and produced gas is metered by a flowmeter.
In the practical condensate gas reservoir failure development process, the production difference exists between the whole well end and the near well end, the gas source from the whole well end is supplemented at the near well end, the existing condensate gas reservoir failure development simulation device cannot distinguish the failure development difference between the near well end and the whole well end, and the experimental precision is not facilitated. And to above-mentioned current condensate gas reservoir failure development analogue means, because the rock core is very dense, the hole infiltration is very low, and the condensate oil volume that separates out in the experiment is very little, and has partial condensate oil to adhere to the pipeline wall, causes experimental error great, is difficult to accurate estimate condensate gas reservoir's anti-condensation degree and condensate oil recovery ratio.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention provides a dense sandstone condensate gas reservoir failure development simulation device and a dense sandstone condensate gas reservoir failure development simulation method.
In order to achieve the above object, the present invention provides a tight sandstone condensate gas reservoir failure development simulation apparatus, comprising:
the core holder module is arranged in the incubator;
the condensate gas saturation module is connected with the inlet end of the core holder module through a first pipeline, and an upstream valve is arranged on the first pipeline;
the first interface, the second interface, the third interface and the fourth interface of the four-way valve are respectively connected with the outlet end of the core holder module, the downstream displacement module, the back pressure valve and the temperature and pressure monitoring module;
and the collecting and metering module is connected with the back pressure valve.
Optionally, the core holder module includes the casing, be provided with the sleeve in the casing, be connected with the confining pressure liquid injection pump on the casing, the casing with temperature and pressure monitoring module is connected, be used for placing the rock core in the sleeve and separate rock core and confining pressure liquid.
Optionally, the condensate gas saturation module comprises an injection pump and an intermediate container which are sequentially connected, wherein the intermediate container is used for containing nitrogen and condensate gas, and the intermediate container is connected with the first pipeline.
Optionally, the downstream displacement module comprises a downstream displacement pump and a downstream intermediate container which are connected in sequence.
Optionally, the temperature and pressure monitoring module includes:
the confining pressure sensor is connected with the core holder module;
the temperature monitor is connected with the core holder module;
and the downstream pressure sensor is connected with the fourth interface.
Optionally, the collection metering module includes:
the gas-liquid separator is connected to the downstream of the back pressure valve, a U-shaped pipe with scales is arranged in the gas-liquid separator, and the U-shaped pipe with scales is used for collecting liquid phase;
and the gas flowmeter is connected with a gas phase outlet of the gas-liquid separator.
Optionally, the both ends of casing are provided with the opening, the opening is used for installing the end, the casing with the end forms sealed cavity, be provided with confining pressure detection mouth and temperature detection mouth on the outer wall of casing.
The invention also provides a dense sandstone condensate gas reservoir failure development simulation method, which utilizes the dense sandstone condensate gas reservoir failure development simulation device, and comprises the following steps:
placing a core in a core holder module, and forming an original condensate gas reservoir model in the core holder module;
injecting nitrogen into the rock core through a condensate gas saturation module;
injecting condensate gas into the rock core through a condensate gas saturation module, and driving out nitrogen in the rock core;
when full well end failure development is carried out, the upstream valve is closed, and the back pressure valve is regulated to carry out depressurization failure development;
when near-well failure development is carried out, an upstream valve is opened, condensate gas supplement is provided through a condensate gas saturation module, and a back pressure valve is regulated to carry out depressurization failure development;
the gas and liquid phase products in the experiment were collected and metered using a collection metering module.
Optionally, before the core is placed in the core holder module and an original condensate gas reservoir model is formed in the core holder module, the condensate gas obtaining includes:
referring to a PVT test report of a condensate gas reservoir, performing condensate gas compounding under a set pressure;
carrying out 2-3 times of single degassing experiments on the compounded condensate gas sample;
chromatographic analysis is carried out on the natural gas components after flash evaporation, and the natural gas components are compared with original condensate single degassing phase chromatographic data in a condensate reservoir PVT test report, and when the natural gas components are C 1 And when the content difference is within 3%, the condensate gas is qualified.
Optionally, before collecting and metering the gas phase and liquid phase products in the experiment using the collection metering module, further comprising:
and pumping nitrogen into a pipeline at the downstream of the back pressure valve through a downstream displacement module, and blowing condensate oil attached to the pipe wall in the pipeline at the downstream of the back pressure valve into the collecting and metering module.
The invention provides a dense sandstone condensate gas reservoir failure development simulation device and method, which have the beneficial effects that: the device is provided with the upstream valve between condensate gas saturation module and rock core holder module, can distinguish condensate gas reservoir failure development simulation experiment in-process full well end and near-well end's difference to have cross valve and low reaches displacement module, can blow out the condensate oil that is attached to the pipeline wall to collecting the metering module through the displacement of low reaches displacement module, improve experimental accuracy.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The foregoing and other objects, features and advantages of the invention will be apparent from the following more particular descriptions of exemplary embodiments of the invention as illustrated in the accompanying drawings wherein like reference numbers generally represent like parts throughout the exemplary embodiments of the invention.
Fig. 1 shows a schematic structural diagram of a tight sandstone condensate gas reservoir failure development simulation device, according to an embodiment of the present invention.
Fig. 2 shows a schematic diagram of the core holder module of a tight sandstone condensate gas reservoir failure development simulator, according to an embodiment of the present invention.
Fig. 3 is a schematic diagram showing a connection structure of a four-way valve of a tight sandstone condensate gas reservoir failure development simulation device according to an embodiment of the present invention.
Fig. 4 shows a flow chart of a tight sandstone condensate gas reservoir failure development simulation method, according to one embodiment of the present invention.
Reference numerals illustrate:
1. a core holder module; 2. a constant temperature box; 3. a condensate gas saturation module; 4. an upstream valve; 5. a four-way valve; 6. a downstream displacement module; 7. a back pressure valve; 8. a temperature and pressure monitoring module; 9. collecting a metering module; 10. a housing; 11. a sleeve; 12. a confining pressure liquid injection pump; 13. an injection pump; 14. an intermediate container; 15. a downstream displacement pump; 16. a downstream intermediate vessel; 17. a confining pressure sensor; 18. a temperature monitor; 19. a downstream pressure sensor; 20. a gas-liquid separator; 21. u-shaped tube with graduation; 22. a gas flow meter; 23. an end head; 24. a confining pressure detection port; 25. a temperature detection port; 26. and a control unit.
Detailed Description
Preferred embodiments of the present invention will be described in more detail below. While the preferred embodiments of the present invention are described below, it should be understood that the present invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
The invention provides a dense sandstone condensate gas reservoir failure development simulation device, which comprises:
the core holder module is arranged in the incubator;
the condensate gas saturation module is connected with the inlet end of the core holder module through a first pipeline, and an upstream valve is arranged on the first pipeline;
the four-way valve is connected with the outlet end of the core holder module, the downstream displacement module, the back pressure valve and the temperature and pressure monitoring module respectively;
and the collecting and metering module is connected with the back pressure valve.
Specifically, an upstream valve is arranged between a condensate gas saturation module and a core holder module, the upstream valve is closed when a full-well-end condensate gas reservoir failure development simulation experiment is performed, the upstream valve is opened when a near-well-end condensate gas reservoir failure development simulation experiment is performed, condensate gas supplementation is provided through the condensate gas saturation module, and therefore differences between the full-well-end and the near-well-end in the condensate gas reservoir failure development simulation experiment process are distinguished; the device is provided with the cross valve on the exit end of rock core holder module, four interfaces of cross valve respectively with the exit end of rock core holder module, low reaches displacement module, back pressure valve and warm pressure monitoring module are connected, warm pressure monitoring module can carry out the real-time supervision of low reaches end pressure here, the displacement of low reaches end can be carried out with nitrogen gas to the low reaches displacement module, through closing the first interface of rock core low reaches and the fourth interface of being connected with warm pressure monitoring module, open low reaches displacement module and back pressure valve, utilize the displacement effect of low reaches displacement module to blow out the condensate that is attached to pipeline wall to collect metering module, improve experimental accuracy.
Optionally, the core holder module comprises a shell, a sleeve is arranged in the shell, a confining pressure liquid injection pump is connected to the shell, the shell is connected with the temperature and pressure monitoring module, and the sleeve is used for placing the core and separating the core from confining pressure liquid.
Specifically, the shell is used for placing the sleeve and confining pressure liquid, and the outer wall of the shell is provided with a confining pressure liquid inlet and outlet for connecting the confining pressure liquid injection pump; the sleeve is used for placing the core of experiment, separates the core and confining pressure liquid, and transmits confining pressure to the core.
Optionally, the condensate gas saturation module comprises an injection pump and an intermediate container which are sequentially connected, wherein the intermediate container is used for containing nitrogen and condensate gas, and the intermediate container is connected with the first pipeline.
Specifically, the injection pump is an ISCO pump, the injection pump is used for providing displacement pressure, the intermediate container is used for discharging nitrogen and condensate gas, and the upstream valve is used for controlling energy supplement; and (3) a pressure raising stage: an injection pump injects nitrogen into the core from the intermediate container; saturation stage: the injection pump injects condensate gas into the rock core from the intermediate container, and the nitrogen is displaced and flows out from the rock core; failure development stage: and when the full well end experiment is carried out, the upstream valve is closed, and when the near well end experiment is carried out, the upstream valve is opened to provide condensate gas energy supplement.
In one example, since the device has extremely high requirements on air tightness when experiments are carried out, the middle container for accommodating condensate gas is a high-temperature and high-pressure resistant container made of the whole stainless steel material, the temperature requirement is at least 120 ℃ high temperature resistance, and the pressure requirement is at least 60MPa high pressure resistance; the middle containers are connected through a six-way valve so as to realize the conversion requirement of the containers; the upstream valve and the four-way valve are made of stainless steel materials so as to meet the air tightness requirement.
Optionally, the downstream displacement module comprises a downstream displacement pump, a downstream intermediate reservoir connected in sequence.
Specifically, a downstream displacement pump is used to provide injection pressure to the injection medium and the back pressure valve, and a downstream intermediate vessel is used to discharge nitrogen.
Optionally, the temperature and pressure monitoring module includes:
the confining pressure sensor is connected with the core holder module;
the temperature monitor is connected with the core holder module;
and the downstream pressure sensor is connected with the fourth interface.
Specifically, the confining pressure sensor, the temperature monitor and the downstream pressure sensor are all connected with the control unit, and the temperature and pressure monitoring values are recorded and stored in real time; the confining pressure sensor is connected with a confining pressure monitoring port on the shell and is used for monitoring the change of the confining pressure of the rock core; the downstream pressure sensor is connected with the fourth interface and is used for monitoring and measuring the pressure change of the tail end of the rock core; the temperature monitor comprises a temperature probe, wherein the temperature probe is contacted with the sleeve and is used for monitoring the temperature in the sleeve in real time and feeding the temperature back to the control unit.
Optionally, the collection metering module comprises:
the gas-liquid separator is connected to the downstream of the back pressure valve, a U-shaped pipe with scales is arranged in the gas-liquid separator, and the U-shaped pipe with scales is used for collecting liquid phase;
and the gas flowmeter is connected with a gas phase outlet of the gas-liquid separator.
Specifically, the collecting and metering module is used for collecting and metering products in the core in the experimental process, fluid at the downstream of the core enters a U-shaped pipe with scales in the gas-liquid separator through a pipeline by a back pressure valve, liquid phase components are collected, and gas phase components flow out to enter a gas flowmeter; the back pressure valve is used for providing back pressure for the experiment, the gas-liquid separator is used for separating gas phase and liquid phase products in the experiment, the U-shaped pipe with scales is used for collecting and metering the liquid phase products, and the gas flowmeter is used for collecting and metering the gas phase products.
In one example, the graduated U-shaped tube is a specially-made graduated container, and the measurement range is preferably 1-2 ml, and the precision is at least 0.1ml because the volume of the condensate precipitated in the experiment is very small.
Optionally, openings are formed at two ends of the shell, the openings are used for installing the end heads, the shell and the end heads form a sealed cavity, and a confining pressure detection opening and a temperature detection opening are formed in the outer wall of the shell.
Specifically, the end is used for sealing two ends of the shell, and the port and the shell are sealed by threads.
In one example, the shell is made of stainless steel, the two ends of the shell are provided with openings for installing the end heads, the sealed cavity formed by the shell and the end heads is used for containing confining pressure liquid, the shell and the end heads are in sealing connection because confining pressure liquid needs to be injected into the shell, the shell and the end heads are in threaded sealing connection, the shell is provided with built-in threads, the end heads are provided with external threads, and the rubber ring is made of fluorine rubber, so that the shell has corrosion resistance and high temperature resistance; the sleeve is made of rubber, can shrink after being subjected to confining pressure hydraulic pressure, is attached to the built-in core, and transmits confining pressure to the core; the injection pump is an ISCO precision control pump, has constant pressure and cross flow modes, and provides pressure for experiments; the four-way valve is made of stainless steel materials to ensure tightness, and the back pressure valve and the downstream intermediate container are supplied with pressure by a constant pressure constant speed pump.
The invention also provides a dense sandstone condensate gas reservoir failure development simulation method, which utilizes the dense sandstone condensate gas reservoir failure development simulation device, and comprises the following steps:
placing a core in a core holder module, and forming an original condensate gas reservoir model in the core holder module;
injecting nitrogen into the rock core through the condensate gas saturation module;
injecting condensate gas into the rock core through a condensate gas saturation module, and driving out nitrogen in the rock core;
when full well end failure development is carried out, the upstream valve is closed, and the back pressure valve is regulated to carry out depressurization failure development;
when near-well failure development is carried out, an upstream valve is opened, condensate gas supplement is provided through a condensate gas saturation module, and a back pressure valve is regulated to carry out depressurization failure development;
the gas and liquid phase products in the experiment were collected and metered using a collection metering module.
Optionally, before the core is placed in the core holder module and the original condensate gas reservoir model is formed in the core holder module, obtaining the condensate gas includes:
referring to a PVT test report of a condensate gas reservoir, performing condensate gas compounding under a set pressure;
carrying out 2-3 times of single degassing experiments on the compounded condensate gas sample;
chromatographic analysis is carried out on the natural gas components after flash evaporation, and the natural gas components are compared with original condensate single degassing phase chromatographic data in a condensate reservoir PVT test report, and when the natural gas components are C 1 When the content difference is within 3%, the condensate gas is qualified.
Optionally, before collecting and metering the gas phase and liquid phase products in the experiment using the collection metering module, further comprising:
nitrogen is injected into a pipeline downstream of the back pressure valve through the downstream displacement module, and condensate oil attached to the pipe wall in the pipeline downstream of the back pressure valve is blown into the collecting and metering module.
Example 1
As shown in fig. 1 to 3, the present invention provides a tight sandstone condensate gas reservoir failure development simulation apparatus, comprising:
the core holder module 1 is arranged in the incubator 2;
the condensate gas saturation module 3 is connected with the inlet end of the core holder module 1 through a first pipeline, and an upstream valve 4 is arranged on the first pipeline;
the four-way valve 5, a first interface, a second interface, a third interface and a fourth interface of the four-way valve 5 are respectively connected with the outlet end of the core holder module 1, the downstream displacement module 6, the back pressure valve 7 and the temperature and pressure monitoring module 8;
and the collecting and metering module 9 is connected with the back pressure valve 7.
In this embodiment, the core holder module 1 includes a casing 10, a sleeve 11 is disposed in the casing 10, a confining pressure liquid injection pump 12 is connected to the casing 10, the casing 10 is connected to the temperature and pressure monitoring module 8, and the sleeve 11 is used for placing a core and separating the core from confining pressure liquid.
In this embodiment, the condensate saturation module 3 includes an injection pump 13 and an intermediate container 14 connected in sequence, where the intermediate container 14 is used to hold nitrogen and condensate, and the intermediate container 14 is connected to the first pipeline.
In the present embodiment, the downstream displacement module 6 includes a downstream displacement pump 15, a downstream intermediate tank 16, which are connected in sequence.
In the present embodiment, the temperature and pressure monitoring module 8 includes:
the confining pressure sensor 17 is connected with the core holder module 1;
a temperature monitor 18 connected to the core holder module 1;
the downstream pressure sensor 19 is connected to the fourth interface.
In the present embodiment, the collection metering module 9 includes:
the gas-liquid separator 20 is connected to the downstream of the back pressure valve 7, a U-shaped pipe 21 with scales is arranged in the gas-liquid separator 20, and the U-shaped pipe 21 with scales is used for collecting liquid phase;
a gas flow meter 22 is connected to the gas phase outlet of the gas-liquid separator 20.
In this embodiment, openings are provided at both ends of the housing 10, the openings are used for mounting the terminal heads 23, the housing 10 and the terminal heads 23 form a sealed cavity, and a confining pressure detecting port 24 and a temperature detecting port 25 are provided on the outer wall of the housing 10.
Example two
As shown in fig. 4, the present invention further provides a dense sandstone condensate gas reservoir failure development simulation method, and the dense sandstone condensate gas reservoir failure development simulation device comprises:
placing a core in a core holder module 1, and forming an original condensate gas reservoir model in the core holder module 1;
nitrogen is injected into the rock core through the condensate gas saturation module 3;
injecting condensate gas into the rock core through a condensate gas saturation module 3, and driving out nitrogen in the rock core;
when full well end failure development is carried out, the upstream valve is closed, and the back pressure valve 7 is regulated to carry out depressurization failure development;
when near-well end failure development is carried out, an upstream valve is opened, condensate gas supplement is provided through a condensate gas saturation module 3, and a back pressure valve 7 is regulated to carry out depressurization failure development;
the gas and liquid phase products in the experiment were collected and metered using the collection metering module 9.
In this embodiment, before the core is placed in the core holder module 1 and the original condensate gas reservoir model is formed in the core holder module 1, the obtaining the condensate gas includes:
referring to a PVT test report of a condensate gas reservoir, performing condensate gas compounding under a set pressure;
carrying out 2-3 times of single degassing experiments on the compounded condensate gas sample;
chromatographic analysis is carried out on the natural gas components after flash evaporation, and the natural gas components are compared with original condensate single degassing phase chromatographic data in a condensate reservoir PVT test report, and when the natural gas components are C 1 When the content difference is within 3%, the condensate gas is qualified.
In this embodiment, before the collection and metering module 9 is used to collect and meter the gas phase and liquid phase products in the experiment, it further comprises:
nitrogen is injected into a pipeline downstream of the back pressure valve 7 through the downstream displacement module 6, and condensate adhering to the pipe wall in the pipeline downstream of the back pressure valve 7 is blown into the collecting and metering module 9.
In conclusion, the compact sandstone condensate gas reservoir failure development simulation method provided by the invention is implementedWhen the dense sandstone condensate gas reservoir failure development simulation device is used, a condensate gas constant volume failure development simulation experiment in a dense porous medium is developed by taking a primary condensate gas reservoir as an example: the original stratum pressure of the target layer system is 36.803MPa, the corresponding gas reservoir temperature is 94.2 ℃, the PVT fluid phase state test report shows that the dew point pressure of condensate gas at the stratum temperature is 33.771MPa, and the gas-oil ratio is 2738.3m 3 /m 3 The method comprises the steps of carrying out a first treatment on the surface of the Core permeability 0.109mD, porosity 9.1% and length 49.43cm, was simulated by the apparatus shown in fig. 1 based on the above data.
Experimental operation flow:
1. sample preparation of experimental fluid
In this embodiment, the method for obtaining the condensate gas sample by compounding as the condensate gas used in the above method includes:
referring to a PVT test report of a condensate gas reservoir, compounding a condensate gas sample under the pressure of 40MPa, carrying out 2-3 times of single degassing experiments on the compounded condensate gas sample, carrying out chromatographic analysis on the natural gas component after flash evaporation, comparing the chromatographic analysis with single degassing phase chromatographic data of an original sample in the PVT report, and when C 1 The content difference is within 3 percent and is qualified.
2. Instrument mounting connection
The core is put into a core holder module 1, the core holder module 1 is sealed by rubber rings, two ends are blocked by end heads 23, the injection pump 13, the intermediate container 14, the upstream valve 4, the sleeve 11, the four-way valve 5, the back pressure valve 7, the gas-liquid separator 20 and the gas flowmeter 22 are sequentially connected through high-pressure pipelines, the surrounding pressure sensor 17, the temperature probe of the temperature monitor 18, the downstream pressure sensor 19 and the downstream intermediate container 16 are connected to corresponding positions according to the diagram shown in fig. 1, the device is placed in the incubator 2, and the temperature of the incubator 2 is adjusted to be 94 ℃ of a gas reservoir.
3. Establishing an original condensate gas reservoir system
The confining pressure liquid is injected into the shell 10 through the confining pressure liquid injection pump 12 connected to the shell of the core holder module 1, the confining pressure is controlled to be 50MPa by the control unit 26, and the pressure required by the experiment is kept; the hydraulic pressure in the shell 10 acts on the sleeve 11, the sleeve 11 compresses, and the pressure is transmitted to the experimental rock core; the formation overburden pressure was simulated and the back pressure valve 7 was adjusted to apply a back pressure of 38MPa (slightly higher than the formation pressure).
4. Failure development experiment
And (3) a pressure raising stage: nitrogen in the upstream intermediate vessel 14 was fed into the core in the core holder module 1 by the ISCO injection pump 13, and the pressure in the core was gradually increased to 38MPa.
Saturation stage: after the pressure is raised, condensate gas is displaced into the core by the injection pump 13 at 40MPa, nitrogen in the core is displaced, and when the gas-oil ratio and the component analysis measured at the downstream end are basically consistent with those of the injected components at the upstream end, the saturation is considered to be finished.
Stage of failure: for the whole well end, no condensate gas source is supplemented, so that the upstream valve 4 is closed, and the back pressure valve 7 is regulated to directly reduce pressure for failure development; for near-well, opening the upstream valve 4 provides gas supply make-up from the intermediate vessel 14, simulating far-well gas supply make-up under near-well development.
And (3) a collection stage: the fluid in the core enters a gas-liquid separator 20 through a pipeline by a back pressure valve 7, the gas-liquid separator 20 is used for separating gas phase and liquid phase products in experiments and accommodating the liquid phase products into a U-shaped pipe 21 with scales, the liquid phase products are retained in the U-shaped pipe 21 with scales, and the gas phase products flow out of the U-shaped pipe 21 with scales and then flow into a gas flowmeter 22; after failure development to set experimental pressure, the connecting end of the downstream intermediate container 16 is opened, nitrogen displacement is carried out through the downstream displacement pump 15, condensate in the pipeline is carried out into the gas-liquid separator 20 by being discharged through a downstream pipeline through the back pressure valve 7, and accordingly recovery ratio of condensate in each stage can be calculated more accurately.
The foregoing description of embodiments of the invention has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the various embodiments described.
Claims (10)
1. A tight sandstone condensate gas reservoir failure development simulation device, comprising:
the core holder module is arranged in the incubator;
the condensate gas saturation module is connected with the inlet end of the core holder module through a first pipeline, and an upstream valve is arranged on the first pipeline;
the first interface, the second interface, the third interface and the fourth interface of the four-way valve are respectively connected with the outlet end of the core holder module, the downstream displacement module, the back pressure valve and the temperature and pressure monitoring module;
and the collecting and metering module is connected with the back pressure valve.
2. The tight sandstone condensate gas reservoir failure development simulation device according to claim 1, wherein the core holder module comprises a shell, a sleeve is arranged in the shell, a confining pressure liquid injection pump is connected to the shell, the shell is connected with the temperature and pressure monitoring module, and a core is placed in the sleeve and separated from the confining pressure liquid.
3. The dense sandstone condensate gas reservoir failure development simulation device according to claim 1, wherein the condensate gas saturation module comprises an injection pump and an intermediate container which are sequentially connected, wherein the intermediate container is used for containing nitrogen and condensate gas, and the intermediate container is connected with the first pipeline.
4. The tight sandstone condensate gas reservoir failure development simulation device according to claim 1, wherein the downstream displacement module comprises a downstream displacement pump, a downstream intermediate vessel, which are connected in sequence.
5. The tight sandstone condensate gas reservoir failure development simulation device according to claim 1, wherein the temperature and pressure monitoring module comprises:
the confining pressure sensor is connected with the core holder module;
the temperature monitor is connected with the core holder module;
and the downstream pressure sensor is connected with the fourth interface.
6. The tight sandstone condensate gas reservoir failure development simulation device of claim 1, wherein the collection metering module comprises:
the gas-liquid separator is connected to the downstream of the back pressure valve, a U-shaped pipe with scales is arranged in the gas-liquid separator, and the U-shaped pipe with scales is used for collecting liquid phase;
and the gas flowmeter is connected with a gas phase outlet of the gas-liquid separator.
7. The tight sandstone condensate gas reservoir failure development simulation device according to claim 2, wherein openings are formed in two ends of the shell, the openings are used for installing the end heads, the shell and the end heads form a sealed cavity, and a confining pressure detection opening and a temperature detection opening are formed in the outer wall of the shell.
8. A tight sandstone condensate gas reservoir failure development simulation method, using the tight sandstone condensate gas reservoir failure development simulation device according to any one of claims 1 to 7, characterized in that the method comprises:
placing a core in a core holder module, and forming an original condensate gas reservoir model in the core holder module;
injecting nitrogen into the rock core through a condensate gas saturation module;
injecting condensate gas into the rock core through a condensate gas saturation module, and driving out nitrogen in the rock core;
when full well end failure development is carried out, the upstream valve is closed, and the back pressure valve is regulated to carry out depressurization failure development;
when near-well failure development is carried out, an upstream valve is opened, condensate gas supplement is provided through a condensate gas saturation module, and a back pressure valve is regulated to carry out depressurization failure development;
the gas and liquid phase products in the experiment were collected and metered using a collection metering module.
9. The method of claim 8, wherein the obtaining condensate gas prior to placing the core in the core holder module and forming the original condensate gas reservoir model in the core holder module comprises:
referring to a PVT test report of a condensate gas reservoir, performing condensate gas compounding under a set pressure;
carrying out 2-3 times of single degassing experiments on the compounded condensate gas sample;
chromatographic analysis is carried out on the natural gas components after flash evaporation, and the natural gas components are compared with original condensate single degassing phase chromatographic data in a condensate reservoir PVT test report, and when the natural gas components are C 1 And when the content difference is within 3%, the condensate gas is qualified.
10. The tight sandstone condensate gas reservoir failure development simulation method of claim 8, further comprising, prior to collecting and metering the gas and liquid phase products of the experiment using the collection metering module:
and pumping nitrogen into a pipeline at the downstream of the back pressure valve through a downstream displacement module, and blowing condensate oil attached to the pipe wall in the pipeline at the downstream of the back pressure valve into the collecting and metering module.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117703324A (en) * | 2024-01-08 | 2024-03-15 | 西南石油大学 | Device for improving recovery ratio of condensate gas reservoir by injecting carbon dioxide into tight reservoir |
| US11982182B1 (en) * | 2022-12-15 | 2024-05-14 | Southwest Petroleum University | Devices and methods for testing retrograde condensation damage in near well zones of condensate gas reservoirs with high condensate content |
| CN118050491A (en) * | 2024-02-29 | 2024-05-17 | 中国石油大学(北京) | Device and method for determining mist flow pressure interval of condensate gas reservoir |
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2022
- 2022-03-04 CN CN202210211935.9A patent/CN116735835A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11982182B1 (en) * | 2022-12-15 | 2024-05-14 | Southwest Petroleum University | Devices and methods for testing retrograde condensation damage in near well zones of condensate gas reservoirs with high condensate content |
| CN117703324A (en) * | 2024-01-08 | 2024-03-15 | 西南石油大学 | Device for improving recovery ratio of condensate gas reservoir by injecting carbon dioxide into tight reservoir |
| CN118050491A (en) * | 2024-02-29 | 2024-05-17 | 中国石油大学(北京) | Device and method for determining mist flow pressure interval of condensate gas reservoir |
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