CN116297110A - Carbon dioxide sealing simulation system and application method - Google Patents
Carbon dioxide sealing simulation system and application method Download PDFInfo
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- CN116297110A CN116297110A CN202310560582.8A CN202310560582A CN116297110A CN 116297110 A CN116297110 A CN 116297110A CN 202310560582 A CN202310560582 A CN 202310560582A CN 116297110 A CN116297110 A CN 116297110A
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 204
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 104
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 104
- 238000004088 simulation Methods 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000007789 sealing Methods 0.000 title claims abstract description 19
- 238000012544 monitoring process Methods 0.000 claims abstract description 57
- 238000002347 injection Methods 0.000 claims abstract description 55
- 239000007924 injection Substances 0.000 claims abstract description 55
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 18
- 238000010586 diagram Methods 0.000 claims abstract description 10
- 239000008398 formation water Substances 0.000 claims description 48
- 239000010779 crude oil Substances 0.000 claims description 42
- 239000003921 oil Substances 0.000 claims description 26
- 230000009919 sequestration Effects 0.000 claims description 15
- 238000013461 design Methods 0.000 claims description 12
- 238000010146 3D printing Methods 0.000 claims description 11
- 239000002689 soil Substances 0.000 claims description 11
- 238000009826 distribution Methods 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 6
- 230000008859 change Effects 0.000 claims description 5
- 230000035699 permeability Effects 0.000 claims description 4
- 238000007639 printing Methods 0.000 claims description 4
- 238000012937 correction Methods 0.000 claims description 3
- 238000005260 corrosion Methods 0.000 claims description 3
- 230000007797 corrosion Effects 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 2
- 238000007788 roughening Methods 0.000 claims description 2
- 238000005538 encapsulation Methods 0.000 claims 1
- 239000012530 fluid Substances 0.000 abstract description 14
- 238000012545 processing Methods 0.000 abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 230000008569 process Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 239000003673 groundwater Substances 0.000 description 2
- 238000013508 migration Methods 0.000 description 2
- 230000005012 migration Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013480 data collection Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000010365 information processing Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000010792 warming 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
- G01N15/082—Investigating permeability by forcing a fluid through a sample
- G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
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Abstract
The invention relates to the technical field of carbon dioxide burying, in particular to a carbon dioxide sealing simulation system and a using method thereof, wherein the carbon dioxide sealing simulation system comprises an injection system, a depleted gas reservoir simulation system and an information acquisition system, wherein a simulated depleted gas reservoir is arranged in the depleted gas reservoir simulation system, and the upper end of the depleted gas reservoir simulation system is connected with a first monitoring well, a second monitoring well, an injection well and a sealing well; the injection system injects formation fluid into the simulated depleted gas reservoir through the injection well; the information acquisition system comprises gas detectors and an information data processing computer, wherein the gas detectors are uniformly distributed in the depleted gas reservoir box body and connected with the information data processing computer, and the three-dimensional carbon dioxide concentration field diagram in the simulated depleted gas reservoir is obtained through the three-dimensional coordinates of the gas detectors, so that the carbon dioxide burying condition is judged, and the method has important significance in burying carbon dioxide in the depleted gas reservoir.
Description
Technical Field
The invention belongs to the technical field of carbon dioxide burying, and mainly relates to a carbon dioxide sealing simulation system and a using method thereof.
Background
Carbon dioxide capture and sequestration are one of the main measures to reduce carbon dioxide emissions to the atmosphere and to mitigate global warming. Because the carbon dioxide can leak through the pores of the cover layer, faults or cracks in the geological structure and the like, the carbon dioxide stored in the deep stratum moves upwards under the action of high pressure and buoyancy and invades into the shallow groundwater, thereby influencing the quality of the shallow groundwater. Therefore, carbon dioxide sequestration technology is becoming an engineering problem to be solved in ecological protection.
The prior art CN103278615A discloses a test method for carbon dioxide coal seam stratum storage, which adopts a device capable of packaging a large-size test piece at high pressure, and can ensure that the axial pressure and the confining pressure of the test piece respectively reach 120MPa and the ambient temperature reaches 200 ℃. The method can carry out feasibility experiments on coal beds in depths of thousands of meters underground, but does not consider macroscopic structures, and the problem that the carbon dioxide possibly leaks through pores of a cover layer, faults or cracks in a geological structure, abandoned wells or drilling wells and other paths in the carbon dioxide burying process is solved.
The prior art CN114577837A discloses a device and an experimental method for evaluating the structure and permeability of carbon dioxide buried in and displaced from reservoir oil to stratum pore throat, and is characterized by comprising a core clamping system for adjusting pressure and temperature to simulate stratum environment, a fluid injection system for injecting carbon dioxide, stratum water and crude oil into the core clamping system, an information processing and collecting system for controlling valve opening and closing and data collection, and a fluid recovery and treatment system for recovering and treating experimental fluid. However, the core simulation used in the patent document has a certain difference from the actual stratum working condition, and the carbon dioxide sequestration effect of the oil reservoir cannot be evaluated.
Therefore, how to effectively simulate the depleted gas reservoir to embed carbon dioxide and record the migration track of carbon dioxide becomes a problem to be solved by those skilled in the art.
Disclosure of Invention
In view of the foregoing, the present invention has been developed to provide a carbon dioxide sequestration simulation system and method of use that overcomes, or at least partially solves, the foregoing problems.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a carbon dioxide sequestration simulation system comprising: the system comprises a depleted gas reservoir simulation system, an injection system and an information acquisition system;
wherein the depleted gas reservoir simulation system comprises: the device comprises a box body, a box cover, a simulated depleted gas reservoir, sealing equipment and heating equipment; the box cover is arranged above the box body and is connected through bolts; the sealing device (sealing gasket) is arranged in the box body and fixedly arranged below the box cover to play a role in sealing, and the heating device is arranged on the outer side wall of the box body; the depleted simulated gas reservoir is arranged in the box body, and the heating equipment is used for heating the depleted gas reservoir to the formation timing temperature;
the injection system includes: monitoring well, injection well, plugging well, booster pump, pressurizer and container tank; the monitoring well, the injection well and the plugging well are respectively arranged above the box cover and penetrate into the box body;
the plugging well, the booster pump, the pressurizer and the container tank are connected in sequence;
the information acquisition system includes: the system comprises an exhausted gas reservoir detector, a first detector, an information data receiver and a computer; the depleted gas reservoir detectors are provided with a plurality of gas reservoir detectors and are uniformly distributed on the inner surfaces of the box body and the box cover; the first detector is arranged outside one side of the plugging well, which is deep into the box body, and the gas concentration can be sensed by adopting a sensing technology; and the first detector and the depleted gas reservoir detector are connected with the computer through the information data receiver.
Further, the monitoring well comprises a first monitoring well and a second monitoring well, and the first monitoring well and the second monitoring well are respectively arranged above the box cover; the pressurizer comprises a simulated crude oil pressurizer, a simulated formation water pressurizer, a carbon dioxide pressurizer, a first pressurizer, a second pressurizer and a third pressurizer; the container tank comprises a carbon dioxide container tank, a simulated crude oil container tank and a simulated formation water container tank; the carbon dioxide pressurizer, the first pressurizer and the carbon dioxide container tank are connected in sequence; the simulated formation water pressurizer, the second pressurizer and the simulated formation water container tank are connected in sequence; the simulated crude oil pressurizer, the third pressurizer and the simulated crude oil container tank are connected in sequence;
the carbon dioxide pressurizer, the simulated formation water pressurizer and the simulated crude oil pressurizer are all connected with the pressurizing pump.
Further, the information acquisition system further includes: a vacuum pump and reservoir chamber; the vacuum pump is singly connected with the injection well; the pressurizing pump is connected with the injection well through the reservoir cavity, and after the fluid is pressurized to a specified pressure in the reservoir cavity, the fluid enters the simulated depleted gas reservoir through the injection well along the guide pipe to simulate the distribution state of formation water and crude oil in a real working condition.
Further, plastic package gel is arranged on the periphery of the simulated depleted gas reservoir, so that the internal pressure and the temperature of the simulated depleted gas reservoir meet the actual conditions; the simulated depleted gas reservoir comprises a soil layer, a cover layer, carbon dioxide, simulated formation water, simulated formation crude oil and bottom soil which are layered from top to bottom.
Further, the first monitoring well, the second monitoring well, the injection well and the plugging well are distributed according to the actual situation by adopting a similar principle; the monitoring depth of the first monitoring well is positioned below the water level of the simulated formation water, and the water level change of the simulated formation water is monitored; the second monitoring well monitoring depth is positioned above the cover layer and is not in direct contact with the formation fluid, and is used for monitoring whether leakage of carbon dioxide occurs or not and feeding back the leakage depth and concentration; the injection well is used for injecting simulated formation water, simulated formation crude oil and carbon dioxide into the simulated depleted gas reservoir; the plugged well is a abandoned or not intended shaft, the lower part is plugged with cement, and the plugged well is provided with a first detector for feeding back whether carbon dioxide leakage exists or not and evaluating the plugging effect.
The invention also aims at providing a using method of the carbon dioxide seal-up simulation system, which comprises the following steps:
(1) Printing out the simulated depleted gas reservoir through 3D printing, sealing the simulated depleted gas reservoir by using plastic package gel, and opening at the inlet positions of the first monitoring well, the second monitoring well, the injection well and the plugging well;
(2) Placing the simulated depleted gas reservoir into a box body;
(3) The first monitoring well, the second monitoring well, the injection well and the plugging well are connected with the box cover through bolts, and the box cover is connected with the box body through bolts;
(4) Opening a vacuum pump, completing air extraction in the simulated depleted gas reservoir until the pressure of the vacuum pump is maintained at a stable value, and stabilizing the pressure for 3min;
(5) The components in the container tank are pressurized by a pressurizer and then sent to a pressurizing pump for further pressurization, then pumped into a reservoir cavity, and finally injected into a simulated depleted gas reservoir along a guide pipe through an injection well;
(6) Detecting data of the change of the carbon dioxide concentration along with time through a simulated depleted gas reservoir detector;
(7) Determining three-dimensional coordinates of a gas detector, a first monitoring well, a second monitoring well, an injection well and a plugging well;
(8) Recording the detected carbon dioxide concentration data, and then simulating the three-dimensional coordinates of the depleted gas reservoir detector to represent the size of the concentration data by the depth of the color to obtain a carbon dioxide concentration field diagram in the simulated depleted gas reservoir;
(9) And establishing three-dimensional carbon dioxide concentration field diagrams at different T moments, obtaining the corresponding relation between the time axis T and the different T moments, and observing the three-dimensional carbon dioxide concentration field diagrams at the different T moments by adjusting the time axis T.
Further, the 3D printing in step (1) includes the steps of:
1) Quantitatively analyzing the three-dimensional structural characteristics of the oil reservoir;
2) Coarsening the three-dimensional geological model of the oil reservoir;
3) After coarsening, quantitatively analyzing karst cave, corrosion hole and crack of each layer of the model;
4) After the similarity criterion design and the karst cave equivalent size boundary line are determined, converting the karst cave system, the karst cave system and the fracture system into three-dimensional vector models, and obtaining the 3D printing digital model of the oil reservoir three-dimensional geological model through data correction.
Further, the three-dimensional structural features of the reservoir include: and (3) designing the size of an oil reservoir model, a model grid, the lithofacies areas of an oil reservoir cover layer, a soil layer and a bottom layer, and the permeability and the porosity distribution of each lithofacies.
Further, the roughening treatment includes: coarsening the model grid by adopting a volume average method according to the typical block karst cave distribution, and replacing a plurality of heterogeneous fine grid units in the original model by an equivalent mean coarse grid unit.
Further, for a model considering filling, the filling part of the karst cave system is designed in the D printing design, and for a model not considering filling, the three-dimensional geological model of the oil reservoir is screened.
Further, the similarity criteria is designed to: the design of the physical model satisfies geometric similarity, motion similarity and dynamic similarity.
Further, the similarity criteria design further includes: and carrying out similarity design on the characteristic parameters of the three-dimensional geological model of the oil reservoir, wherein the fluid injection time and the fluid injection quantity in the experimental process are similar to those in the actual situation.
Further, the geometric similarity is designed similarly around the karst cave.
Further, the geometrical similarity also comprises filling degree and coordination number which are used as three-dimensional geological feature parameters of the oil reservoir to carry out similar design.
Further, the dynamic similarity is based on the Reynolds similarity criterion, and the model and experimental parameters are adjusted to enable the physical model to be as close as possible to meet the ratio of pressure to gravity.
Further, the step (5) specifically includes the following steps:
opening a simulated formation water container tank, enabling simulated formation water to enter a simulated formation water pressurizer through a second pressurizer, enabling the simulated formation water to enter a pressurizing pump along a guide pipe after being pressurized to the actual formation pressure, enabling the simulated formation water to be pumped into a reservoir cavity after being pressurized again by the pressurizing pump, and finally enabling the simulated formation water to be injected into a simulated depleted gas reservoir along the guide pipe through an injection well;
opening a simulated crude oil container tank, and enabling the simulated crude oil to enter the simulated crude oil pressurizer through a third pressurizer; the simulated crude oil pressurizer pressurizes the simulated stratum crude oil to the actual stratum pressure, the simulated stratum crude oil enters the pressurizing pump along the guide pipe, is pumped into the reservoir cavity after being pressurized again by the pressurizing pump, and finally is injected into the simulated depleted gas reservoir through the injection well along the guide pipe;
the carbon dioxide container tank is opened, carbon dioxide enters the simulated carbon dioxide pressurizer through the first pressurizer, the carbon dioxide pressurizer pressurizes the carbon dioxide to a specified pressure, the carbon dioxide enters the pressurizing pump along the guide pipe, the pressurizing pump pressurizes the carbon dioxide again and pumps the carbon dioxide into the reservoir cavity, and finally the carbon dioxide is injected into the simulated depleted gas reservoir through the injection well along the guide pipe.
Compared with the prior art, the invention has the following beneficial effects:
1. the 3D printing technology is utilized to manufacture the simulated gas reservoir model, the gas reservoir model is more similar to the structural characteristics of a real oil and gas reservoir, and experiments can be carried out on various oil and gas reservoir types.
2. The simulated depleted gas reservoir detector can detect the position of carbon dioxide in the simulated gas reservoir, and the migration track of carbon dioxide in the simulated gas reservoir along with time can be obtained by combining a computer and a three-dimensional oil reservoir geological model during modeling, so that the carbon dioxide sequestration can be better evaluated.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a simulation apparatus for evaluating carbon dioxide buried in an exhausted gas reservoir according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of a depleted gas reservoir simulation system according to an embodiment of the present invention.
Fig. 3 is a cross-sectional view of carbon dioxide concentration distribution in the carbon dioxide sequestration process according to an embodiment of the present invention.
FIG. 4 is a wellbore profile (top: front; bottom: top) of a depleted gas reservoir simulation system provided by an embodiment of the present invention.
FIG. 5 is a schematic view of a well bore in a simulated system of depleted gas reservoirs in accordance with an embodiment of the present invention.
Wherein, in the figure: 1-depleted gas reservoir simulation system; 2-an information data processing receiver; 3-a vacuum pump; 4-a reservoir chamber; 5-a booster pump; 6-simulating a crude oil pressurizer; 7-simulating a formation water pressurizer; 8-carbon dioxide pressurizer; 9-a first pressurizer; 10-a carbon dioxide container; 11-a third pressurizer; 12-simulating a crude oil vessel; 13-a second pressurizer; 14-simulating a formation water container; 15-a data processing computer; 101-exhausting a simulated tank cover of the gas reservoir; 102-exhausting a gas reservoir simulation box body; 103-a sealing gasket; 104-a heater; 105-soil layer; 106-plastic package gel; 107-cap layer; 108-carbon dioxide; 109-simulated formation water; 110-simulating formation crude oil; 111-bottom soil; 112-a first monitoring well; 113-a second monitoring well; 114-an injection well; 115-plugging the well; 116-a first detector; 117-simulating a depleted gas reservoir; 16-simulated depleted gas reservoir detector.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
As shown in fig. 1-5, the simulation device for evaluating the carbon dioxide buried in the depleted gas reservoir provided by the invention comprises a depleted gas reservoir simulation system 1, an injection system and an information acquisition system;
the depleted gas reservoir simulation system 1 includes a depleted gas reservoir simulation case 102, a depleted gas reservoir simulation case cover 101, and a simulated depleted gas reservoir 117; the upper end of the depleted gas reservoir simulation box cover 101 is connected with a first monitoring well 112, a second monitoring well 113, an injection well 114 and a plugging well 115 of the injection system through bolts, the lower end of the depleted gas reservoir simulation box cover is provided with a sealing gasket 103, and after the depleted gas reservoir simulation box body 102 and the depleted gas reservoir simulation box cover 101 are connected through bolts, the sealing gasket 103 plays a role in sealing and is used for maintaining the high-temperature and high-pressure environment of the depleted gas reservoir simulation system 1; the simulated depleted gas reservoir 117 is placed in the depleted gas reservoir simulation box 102, and the heater 104 is arranged on the periphery; the heater 104 is used to heat the simulated depleted gas reservoir 117 to the actual temperature of the formation, wherein the simulated depleted gas reservoir 117 comprises a layer of soil 105, a cover layer 107, carbon dioxide 108, simulated formation water 109, simulated formation crude oil 110 and bottom layer soil 111 arranged in layers from top to bottom.
Referring to fig. 1, the injection system 14 includes a carbon dioxide vessel 10, a first pressurizer 9, a carbon dioxide pressurizer 8, a simulated formation water vessel 14, a second pressurizer 13, a simulated formation water pressurizer 7, a simulated crude oil vessel 12, a third pressurizer 11, a simulated crude oil pressurizer 6, a booster pump 5, and a reservoir chamber 4, and injects a certain amount of simulated formation water 109, simulated formation crude oil 110, and carbon dioxide 108 into a simulated depleted gas reservoir 117 of the depleted gas reservoir simulation system 1 via an injection well 114 through a conduit.
The information acquisition system comprises an analog depleted gas reservoir detector 16, a first detector 116, an information data processing receiver 2 and a data processing computer 15; the simulated depleted gas reservoir detectors 16 are uniformly distributed on the inner surfaces of the depleted gas reservoir simulation box body 102 and the depleted gas reservoir simulation box cover 101, and signal reception is performed through the information data processing receiver 2 of the data processing computer 15, so that the monitoring function is realized; the first detector 116 is located outside the plugged well 115 and senses the concentration of the gas using a sensing technique.
The reservoir chamber 4 is connected with the injection well 114, and after the fluid is pressurized to a specified pressure in the reservoir chamber 4, the fluid enters the simulated depleted gas reservoir 117 through the injection well 114 along the conduit, so as to simulate the distribution state of formation water and crude oil in a real working condition.
The actions and distributions of the first monitoring well 112, the second monitoring well 113, the injection well 114, and the plugged well 115; the first monitoring well 112, the second monitoring well 113, the injection well 114 and the plugging well 115 are distributed according to actual conditions by adopting a similar principle; the first monitoring well 112 monitors the water level change of the simulated formation water 109 with a monitoring depth below the water surface of the simulated formation water 109; the second monitoring well 113 is located above the cap layer at a monitoring depth that is not in direct contact with the formation fluid, and is used to monitor whether leakage of the carbon dioxide 108 occurs and to feed back the depth and concentration of the leakage; injection well 114 is used to inject simulated formation water 109, simulated formation crude oil 110 and carbon dioxide 108 into simulated depleted gas reservoir 117; the plugged well 115 is a abandoned or not intended wellbore, plugged with cement at the lower portion, and the plugged well 115 is provided with a first detector 117 for feeding back whether there is a leak of carbon dioxide 108 and evaluating the plugging effect.
Example 2
The method for using the carbon dioxide sequestration simulation system in embodiment 1 comprises the following steps:
step 1: printing out a simulated depleted gas reservoir 117 through 3D printing, sealing the simulated depleted gas reservoir 117 by using plastic package gel 106, and opening at the entry positions of a first monitoring well 112, a second monitoring well 113, an injection well 114 and a plugging well 115;
step 2: placing the simulated depleted gas reservoir 117 into the depleted gas reservoir simulation box 102;
step 3: the first monitoring well 112, the second monitoring well 113, the injection well 114 and the plugging well 115 are connected with the depleted gas reservoir simulation box cover 101 through bolts, and the depleted gas reservoir simulation box cover 101 is connected with the depleted gas reservoir simulation box body 102 through bolts;
step 4: opening the vacuum pump 3, and completing air extraction in the depleted gas reservoir simulation system 1 until the pressure of the vacuum pump 3 is maintained at a stable value and stabilized for 3min;
step 5: opening a simulated formation water container 14, enabling simulated formation water to enter a simulated formation water pressurizer 7 through a second pressurizer 13, enabling the simulated formation water to enter a pressurizing pump 5 along a conduit after the simulated formation water is pressurized to the actual formation pressure by the simulated formation water pressurizer 7, pressurizing again by the pressurizing pump 5 and then pumping the pressurized formation water into a reservoir cavity 4, and finally injecting the pressurized formation water into a simulated depletion gas reservoir 117 along the conduit through an injection well 114;
step 6: opening the simulated crude oil container 12, the simulated crude oil will enter the simulated crude oil pressurizer 6 through the third pressurizer 11; after the simulated crude oil pressurizer 6 pressurizes the simulated formation crude oil 110 to the actual formation pressure, the simulated formation crude oil enters the pressurizing pump 5 along the conduit, is pumped into the reservoir cavity 4 after being pressurized again by the pressurizing pump 5, and finally is injected into the simulated depleted gas reservoir 117 along the conduit through the injection well 114;
step 7: the carbon dioxide container 10 is opened, carbon dioxide enters the simulated carbon dioxide pressurizer 8 through the first pressurizer 9, the carbon dioxide pressurizer 8 pressurizes the carbon dioxide to a specified pressure, then enters the pressurizing pump 5 along the conduit, is pressurized again by the pressurizing pump 5, then is pumped into the reservoir cavity 4, and finally is injected into the simulated depleted gas reservoir 117 through the injection well 114 along the conduit.
Step 8: data simulating the change in concentration of carbon dioxide 108 over time detected by depleted gas reservoir detector 16;
step 9: determining three-dimensional coordinates of the gas detector, the first monitoring well 112, the second monitoring well 113, the injection well 114, and the plugged well 115 in the information acquisition system 15;
step 10: the information acquisition system 15 records the detected concentration data of the carbon dioxide 108;
step 11: by simulating the three-dimensional coordinates of the depleted gas reservoir detector 16, the size of the concentration data is expressed by the depth of the color, and a three-dimensional carbon dioxide 108 concentration field map in the simulated depleted gas reservoir 117 at a certain time can be obtained;
step 12: establishing three-dimensional 108 concentration field diagrams at different T moments to obtain corresponding relations between a time axis T and different T moments;
step 13: by adjusting the time axis T, a three-dimensional map of the concentration of carbon dioxide 108 at different times T can be observed.
In this embodiment, modeling and 3D printing of the simulated depleted gas reservoir 117 includes the steps of:
quantitatively analyzing the three-dimensional structural characteristics of the oil reservoir;
coarsening the three-dimensional geological model of the oil reservoir;
after coarsening, quantitatively analyzing karst cave, corrosion hole and crack of each layer of the model;
after the similarity criterion design and the karst cave equivalent size boundary line are determined, converting the karst cave system, the karst cave system and the fracture system into three-dimensional vector models, and obtaining the 3D printing digital model of the oil reservoir three-dimensional geological model through data correction.
A three-dimensional structural feature of a reservoir comprising: and (3) designing the size of an oil reservoir model, a model grid, the lithofacies areas of an oil reservoir cover layer, a soil layer and a bottom layer, and the permeability and the porosity distribution of each lithofacies.
Coarsening the model grid by adopting a volume average method according to the typical block karst cave distribution, and replacing a plurality of heterogeneous fine grid units in the original model by an equivalent mean coarse grid unit.
And designing a filling part of the karst cave system when the model is designed in a 3D printing mode, and screening the three-dimensional geological model of the oil reservoir when the model is not designed in the filling mode.
The similarity criteria were designed as: the design of the physical model satisfies geometric similarity, motion similarity and dynamic similarity.
The similarity criteria design further includes: and carrying out similarity design on the characteristic parameters of the three-dimensional geological model of the oil reservoir, wherein the fluid injection time and the fluid injection quantity in the experimental process are similar to those in the actual situation.
Geometrical similarities are designed similarly around karst cave.
Geometric similarity also comprises filling degree and coordination number which are used as three-dimensional geological feature parameters of the oil reservoir to carry out similar design.
The dynamic similarity is based on the Reynolds similarity criterion, and the model and experimental parameters are adjusted to enable the physical model to be close to the ratio of pressure to gravity as much as possible.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A carbon dioxide sequestration simulation system, comprising: the system comprises a depleted gas reservoir simulation system, an injection system and an information acquisition system;
wherein the depleted gas reservoir simulation system comprises: the device comprises a box body, a box cover, a simulated depleted gas reservoir, sealing equipment and heating equipment; the box cover is arranged above the box body; the sealing equipment is arranged in the box body and is fixed below the box cover; the heating equipment is arranged on the outer side wall of the box body; the depletion simulated gas reservoir is arranged in the box body;
the injection system includes: monitoring well, injection well, plugging well, booster pump, pressurizer and container tank; the monitoring well, the injection well and the plugging well are respectively arranged above the box cover and penetrate into the box body;
the plugging well, the booster pump, the pressurizer and the container tank are connected in sequence;
the information acquisition system includes: the system comprises an exhausted gas reservoir detector, a first detector, an information data receiver and a computer; the depleted gas reservoir detectors are provided with a plurality of gas reservoir detectors and are uniformly distributed on the inner surfaces of the box body and the box cover; the first detector is arranged outside one side of the plugging well, which is deep into the box body; and the first detector and the depleted gas reservoir detector are connected with the computer through the information data receiver.
2. The carbon dioxide sequestration simulation system according to claim 1, wherein the monitoring wells comprise a first monitoring well and a second monitoring well, the first and second monitoring wells being disposed above the cover, respectively; the pressurizer comprises a simulated crude oil pressurizer, a simulated formation water pressurizer, a carbon dioxide pressurizer, a first pressurizer, a second pressurizer and a third pressurizer; the container tank comprises a carbon dioxide container tank, a simulated crude oil container tank and a simulated formation water container tank; the carbon dioxide pressurizer, the first pressurizer and the carbon dioxide container tank are connected in sequence; the simulated formation water pressurizer, the second pressurizer and the simulated formation water container tank are connected in sequence; the simulated crude oil pressurizer, the third pressurizer and the simulated crude oil container tank are connected in sequence;
the carbon dioxide pressurizer, the simulated formation water pressurizer and the simulated crude oil pressurizer are all connected with the pressurizing pump.
3. The carbon dioxide sequestration simulation system according to claim 2, wherein the information acquisition system further comprises: a vacuum pump and reservoir chamber; the vacuum pump is singly connected with the injection well; the booster pump is connected with the injection well through the reservoir cavity.
4. The carbon dioxide sequestration simulation system according to claim 2, wherein the simulated depleted gas reservoir is peripherally provided with a plastic encapsulation gel; the simulated depleted gas reservoir comprises a soil layer, a cover layer, carbon dioxide, simulated formation water, simulated formation crude oil and bottom soil which are layered from top to bottom.
5. The carbon dioxide sequestration simulation system according to claim 2, wherein the first monitoring well monitoring depth is below the simulated formation water surface; the second monitoring well monitoring depth is located above the cover layer, and the bottom depth of the plugging well is located on the carbon dioxide layer.
6. A method for using the carbon dioxide sequestration simulation system, characterized by selecting the carbon dioxide sequestration simulation system according to any one of claims 3 to 5, comprising the following steps:
(1) Printing out the simulated depleted gas reservoir through 3D printing, sealing the simulated depleted gas reservoir by using plastic package gel, and opening at the inlet positions of the first monitoring well, the second monitoring well, the injection well and the plugging well;
(2) Placing the simulated depleted gas reservoir into a box body;
(3) The first monitoring well, the second monitoring well, the injection well and the plugging well are connected with the box cover through bolts, and the box cover is connected with the box body through bolts;
(4) Opening a vacuum pump, and pumping air in the simulated depleted gas reservoir until the pressure of the vacuum pump is maintained at a stable value and is stabilized for 3min;
(5) The components in the container tank are pressurized by a pressurizer and then sent to a pressurizing pump for further pressurization, then pumped into a reservoir cavity, and finally injected into a simulated depleted gas reservoir along a guide pipe through an injection well;
(6) Detecting data of the change of the carbon dioxide concentration along with time through a simulated depleted gas reservoir detector;
(7) Determining three-dimensional coordinates of a gas detector, a first monitoring well, a second monitoring well, an injection well and a plugging well;
(8) Recording the detected carbon dioxide concentration data, and then simulating the three-dimensional coordinates of the depleted gas reservoir detector to represent the size of the concentration data by the depth of the color to obtain a carbon dioxide concentration field diagram in the simulated depleted gas reservoir;
(9) And establishing three-dimensional carbon dioxide concentration field diagrams at different T moments, obtaining the corresponding relation between the time axis T and the different T moments, and observing the three-dimensional carbon dioxide concentration field diagrams at the different T moments by adjusting the time axis T.
7. The method of claim 6, wherein the 3D printing in step (1) comprises the steps of:
1) Quantitatively analyzing the three-dimensional structural characteristics of the oil reservoir;
2) Coarsening the three-dimensional geological model of the oil reservoir;
3) After coarsening, quantitatively analyzing karst cave, corrosion hole and crack of each layer of the model;
4) After the similarity criterion design and the karst cave equivalent size boundary line are determined, converting the karst cave system, the karst cave system and the fracture system into three-dimensional vector models, and obtaining the 3D printing digital model of the oil reservoir three-dimensional geological model through data correction.
8. The method of claim 7, wherein the three-dimensional structural features of the reservoir comprise: and (3) designing the size of an oil reservoir model, a model grid, the lithofacies areas of an oil reservoir cover layer, a soil layer and a bottom layer, and the permeability and the porosity distribution of each lithofacies.
9. The method of claim 7, wherein the roughening comprises: coarsening the model grid by adopting a volume average method according to the typical block karst cave distribution, and replacing a plurality of heterogeneous fine grid units in the original model by an equivalent mean coarse grid unit.
10. The method of claim 6, wherein step (5) comprises the steps of:
opening a simulated formation water container tank, enabling simulated formation water to enter a simulated formation water pressurizer through a second pressurizer, enabling the simulated formation water to enter a pressurizing pump along a guide pipe after being pressurized to the actual formation pressure, enabling the simulated formation water to be pumped into a reservoir cavity after being pressurized again by the pressurizing pump, and finally enabling the simulated formation water to be injected into a simulated depleted gas reservoir along the guide pipe through an injection well;
opening a simulated crude oil container tank, and enabling the simulated crude oil to enter the simulated crude oil pressurizer through a third pressurizer; the simulated crude oil pressurizer pressurizes the simulated stratum crude oil to the actual stratum pressure, the simulated stratum crude oil enters the pressurizing pump along the guide pipe, is pumped into the reservoir cavity after being pressurized again by the pressurizing pump, and finally is injected into the simulated depleted gas reservoir through the injection well along the guide pipe;
the carbon dioxide container tank is opened, carbon dioxide enters the simulated carbon dioxide pressurizer through the first pressurizer, the carbon dioxide pressurizer pressurizes the carbon dioxide to a specified pressure, the carbon dioxide enters the pressurizing pump along the guide pipe, the pressurizing pump pressurizes the carbon dioxide again and pumps the carbon dioxide into the reservoir cavity, and finally the carbon dioxide is injected into the simulated depleted gas reservoir through the injection well along the guide pipe.
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