CN114839130A - Method for establishing high-temperature high-pressure large-scale section model bound water experimental conditions - Google Patents
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- 239000008398 formation water Substances 0.000 claims abstract description 49
- 229920006395 saturated elastomer Polymers 0.000 claims abstract description 35
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- 239000011435 rock Substances 0.000 claims description 48
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- 238000009827 uniform distribution Methods 0.000 abstract description 3
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- 238000011161 development Methods 0.000 description 2
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- 239000004215 Carbon black (E152) Substances 0.000 description 1
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Abstract
The invention discloses a method for establishing water-binding experimental conditions of a high-temperature high-pressure large-scale section model, which comprises the following steps: (1) manufacturing a high-temperature high-pressure large-scale section model, and pre-burying a plurality of sections of sieve tube pipelines at the periphery and the central area of the model; (2) vacuumizing the model, and vacuumizing the model to a negative pressure state through a vacuum pump; (3) the model saturates the formation water, the model is placed in a kettle body filled with the formation water through a lifting mechanism, and the formation water is fully and uniformly saturated by the model in a pressurization saturation mode; (4) and (3) establishing bound water by using the model, injecting crude oil (or gas) from the top by using a lifting mechanism to drive formation water in the model by considering the gravity differentiation of oil (gas) and water, and realizing uniform distribution of the saturation of the bound water in each area in the model. The method has strong operability, greatly improves the experimental efficiency, saves the time for building the model with the bound water, ensures the uniform distribution of the bound water in the model, and lays a foundation for the subsequent displacement experiment of the model.
Description
Technical Field
The invention relates to a method for establishing a water binding experimental condition of a high-temperature high-pressure large-scale profile model, belonging to the field of petroleum and natural gas exploration and development.
Background
The high-temperature high-pressure large-scale profile model is an important experimental device for carrying out indoor high-temperature high-pressure displacement experiments, and researchers usually simulate high-temperature high-pressure strata by using the high-temperature high-pressure large-scale profile model to research the development rule of oil and gas reservoirs.
At present, the method for establishing bound water by the standard plunger core is mainly divided into two methods. One method is to vacuumize a standard plunger core by using a vacuum pump and then enable the standard plunger core to perform self-absorption of saturated formation water, such as a core bound water saturation method related in a dense rock saturation device and method (CN108152105B, 2020-04-14, Wangbu peak). The other method is that after the standard plunger core is vacuumized, quantitative formation water is injected according to the saturation degree and the saturated water volume of the restriction water of the standard plunger core, such as the core restriction water saturation method related in a determination and establishment method (CN102608011B, 2013-10-09, Dujianfen) of the core of a fracture-pore (hole) type reservoir, the amount of the injected formation water is determined according to the pore volume and the restriction water volume of the core, the temperature of a holder system is heated to 120 ℃ through negative pressure, so that the water is changed into water vapor to be uniformly distributed, and finally, crude oil or gas is injected for displacement, so that the core restriction water is determined and established. However, because the two methods for saturated bound water are mainly directed at the standard plunger core, and both methods only inject formation water from the inlet end of the core holder and then inject crude oil or gas for displacement, but because the size of the high-temperature high-pressure large-scale profile model is large, if the two methods are used for establishing bound water in the high-temperature high-pressure large-scale profile model, the injected crude oil or gas is difficult to uniformly displace each area of the rock plate, partial areas of the rock plate are difficult to be swept, so that the volume of the bound water at the injection end of the high-temperature high-pressure large-scale profile model is far lower than that of the bound water at the outlet end, and finally, the oil and gas saturation of the high-temperature high-pressure large-scale profile model is uneven and insufficient (as shown in fig. 4), and the pore volume and the bound water volume of the high-temperature high-pressure large-scale profile model are difficult to be accurately measured, the two methods for establishing bound water in the high-temperature high-pressure large-scale profile model are not suitable for being used in the high-temperature high-pressure large-scale profile model Bound water was established. Therefore, aiming at the problems of uneven saturation bound water, insufficient saturation bound water and the like of the high-temperature high-pressure large-scale section model, the establishment method for determining the new high-temperature high-pressure large-scale section model bound water experimental conditions is necessary.
Disclosure of Invention
The invention mainly aims at the problems that the conventional experimental method for establishing bound water by using the current standard plunger core is not suitable for establishing the experimental conditions of bound water of a high-temperature high-pressure large-scale section model and the like, and provides a novel method suitable for establishing the experimental conditions of bound water of the high-temperature high-pressure large-scale section model.
In order to achieve the above technical objects, the present invention provides the following technical solutions.
A method for establishing the experimental conditions of the high-temperature high-pressure large-scale section model bound water sequentially comprises the following steps:
(1) manufacturing a high-temperature high-pressure large-scale section model:
the high-temperature high-pressure large-scale section model is composed of a rectangular flat plate with the size of 30cm (height) multiplied by 100cm (length) multiplied by 1cm (thickness) and a groove attached inside, the groove part is used for filling quartz sand to manufacture a rock plate, and the porosity phi of the rock plate is obtained through a hole penetration test after the rock plate is manufactured 0 Permeability K 0 The value is used as the permeability parameter phi of the bedrock 0 ，K 0 And calculating to obtain the pore volume V of the rock plate P ＝30×100×1×φ 0 (ii) a A plurality of screen pipe lines (as shown in figure 2) are preset and buried in the groove of the high-temperature high-pressure large-scale section model, and the screen pipe lines 38, 39, 40, 41 and 42 are respectively positioned at five positions of the upper edge part, the lower edge part, the left edge part, the right edge part and the middle part of the high-temperature high-pressure large-scale section model, are respectively connected to 5 injection ends 43, 44, 45, 46 and 47 of the high-temperature high-pressure large-scale section model, and are used for saturating formation water and establishing bound water; meanwhile, a fluid injection interface and a fluid extraction interface are arranged outside the high-temperature high-pressure large-scale section model, a fluid physical property test point is arranged inside the high-temperature high-pressure large-scale section model,fluid physical property test probes are distributed at the test points; the injection end of the high-temperature high-pressure large-scale section model is connected with a formation water sample intermediate container, a nitrogen intermediate container and a high-pressure displacement pump; the extraction end of the high-temperature high-pressure large-scale section model is connected with a vacuum pump, a vacuum meter, a back pressure valve, a glass measuring cylinder, a nitrogen intermediate container and a high-pressure displacement pump; the high-temperature high-pressure large-scale profile model is connected with a data acquisition system and a pressure sensor; meanwhile, the high-temperature high-pressure large-scale section model can rotate at any angle of 360 degrees through the lifting mechanism.
(2) Carrying out vacuum-pumping treatment on the high-temperature high-pressure large-scale section model:
connecting all devices according to an experimental flow, and vacuumizing the rock plate from the high-temperature high-pressure large-scale profile model extraction end by using a vacuum pump; the whole process of vacuumizing lasts for 8 hours, and vacuumizing is stopped until the vacuum degree of the rock plate reaches below negative pressure, so that the whole rock plate is in a vacuum state, and all valves are closed.
(3) Saturated formation water of the high-temperature high-pressure large-scale section model:
firstly, a rock plate 53 is placed in a kettle body device 51 (the kettle body device is shown in figure 3) through a lifting mechanism, and a high-pressure displacement pump 48, a valve 49, a formation water intermediate container 50 and a precision pressure gauge 52 are connected to the exterior of the kettle body device; then, the formation water in the formation water intermediate container 50 is injected into the kettle body 51 through the high-pressure displacement pump 48, and after the injection is continued for a period of time, the injection is stopped until the pressure value displayed by the precision pressure gauge 52 is 10 MPa; pressurizing saturated formation water by using a high-temperature high-pressure large-scale section model under the condition of keeping the pressure of a kettle body constant at 10MPa, wherein the duration time of the whole process of pressurizing the saturated formation water is 10 hours; after 10 hours, ending the stratum water saturation process, collecting the water saturation of each position in the rock plate in real time through the data acquisition system 37, and judging whether the stratum water at each position of the rock plate is uniformly and fully saturated or not, if so, ending the whole saturated stratum water process, otherwise, repeating the steps again until the stratum water is uniformly saturated and fully saturated; at this point, the saturated formation water of the high-temperature high-pressure large-scale section model is finished, and the total water injected into the high-temperature high-pressure large-scale section model is recordedQuantity V wi 。
(4) Building bound water by using a high-temperature high-pressure large-scale section model:
after the stratum water saturation of the high-temperature high-pressure large-scale section model is finished, vertically placing the high-temperature high-pressure large-scale section model through a lifting mechanism; the pressure of the back pressure valve 35 is set to 15MPa through the high-pressure displacement pump 2 and the nitrogen intermediate container 30; opening an injection end interface valve connected with a first sieve pipe pipeline positioned at the top of the rock plate, injecting nitrogen in a nitrogen intermediate container 29 into a high-temperature high-pressure large-scale section model through a high-pressure displacement pump 1, starting to inject nitrogen into the rock plate from top to bottom to displace formation water under the condition of considering the gravity differentiation of oil (gas) and water until the water outlet of the extraction end is stopped, closing the injection end interface valve, and recording to obtain the first displacement water volume V 1 (ii) a Then, the high-temperature high-pressure large-scale section model is rotated by 90 degrees clockwise through the lifting mechanism, an injection port interface valve of a second screen pipe pipeline connection positioned at the top of the rock plate at the moment is opened, nitrogen is injected into the rock plate from top to bottom to displace formation water until the extraction end stops water outlet, the injection port interface valve is closed, and the second water outlet volume V is recorded 2 (ii) a Respectively rotating the high-temperature high-pressure large-scale section model clockwise by 180 degrees and 270 degrees according to the step of establishing bound water to establish bound water conditions, and recording to obtain the third and fourth expelled water volumes V 3 、V 4 (ii) a After the bound water is built through the four side screen pipe lines, nitrogen is injected through the middle screen pipe line to displace formation water from the middle of the rock plate according to the steps, and the fifth displacement volume V is recorded 5 (ii) a The whole process of building the bound water is carried out in five steps; after the five steps of establishing the bound water are finished, the data acquisition system 37 is used for collecting the saturation of the bound water at each position in the rock plate in real time, whether the bound water at each position of the rock plate is saturated uniformly and sufficiently is checked, if yes, the whole process of establishing the bound water is finished, if not, the five steps are repeated again until the bound water is saturated uniformly and sufficiently (the result is shown in figure 5), and finally, the total water yield V is recorded w Thereby obtaining a high-temperature high-pressure rulerActual irreducible water saturation S of degree profile model wi ＝(V wi -V w )/V p 。
Compared with the existing method for establishing the water binding experiment condition of the high-temperature high-pressure large-scale section model, the method has the following advantages that:
(1) the method has simple operation process, greatly improves the experiment efficiency and saves the experiment time.
(2) The invention is characterized in that a plurality of screen pipe lines are pre-buried in the periphery and the central area of the model, and formation water and displacement bound water are sequentially saturated from different directions of the high-temperature high-pressure large-scale section model respectively, so that formation water can reach each area of a rock plate, the full saturation and uniform distribution degree of the formation water in the rock plate is ensured, and the uniform and full saturation of the bound water of the rock plate is finally ensured.
Drawings
FIG. 1 is a schematic structural diagram of a high-temperature high-pressure large-scale section model.
In the figure: 1. 2-high pressure displacement pump; 3. 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28-valves; 29. 30-nitrogen intermediate vessel; 31-formation water intermediate container; 32-high temperature high pressure large scale section model; 33-vacuum gauge; 34-a vacuum pump; 35-a back pressure valve; 36-glass measuring cylinder; 37-data acquisition system.
FIG. 2 is a diagram of the internal pipeline distribution of the high-temperature high-pressure large-scale section model.
In the figure: 38. 39, 40, 41, 42-screen lines; 43. 44, 45, 46, 47-injection end interface.
FIG. 3 is a schematic view of the kettle structure.
In the figure: 48-high pressure displacement pump; 49-a valve; 50-formation water intermediate container; 51-kettle body; 52-precision pressure gauge; 53-rock plate.
FIG. 4 is a graph of oil and gas saturation distribution of a high temperature, high pressure, large scale profile model using a conventional standard plunger core to establish irreducible water.
FIG. 5 is a graph of oil and gas saturation distribution of a high temperature, high pressure, large scale profile model using the method of establishing irreducible water provided by this patent.
In the figure: the black areas represent the hydrocarbon saturation distribution.
Detailed Description
The foregoing and other objects, features, and advantages of the invention will be apparent from the following more particular description of the invention, as illustrated in the accompanying drawings.
As shown in FIG. 1, the invention provides a new method for establishing high-temperature high-pressure large-scale section model bound water experiment conditions, wherein an experiment device for realizing the method mainly comprises experiment instruments such as high-pressure displacement pumps 1 and 2, valves 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, nitrogen intermediate containers 29 and 30, a formation water intermediate container 31, a high-temperature high-pressure large-scale section model 32, a vacuum meter 33, a vacuum pump 34, a back pressure valve 35, a glass measuring cylinder 36, a data acquisition system 37 and the like.
A method for establishing a water-binding condition of a high-temperature and high-pressure profile model sequentially comprises the following steps:
(1) manufacturing a high-temperature high-pressure large-scale section model:
the high-temperature high-pressure large-scale section model 32 is composed of a rectangular flat plate with the size of 30cm (height) multiplied by 100cm (length) multiplied by 1cm (thickness) and a groove attached inside, the groove part is used for filling quartz sand to manufacture a rock plate, and the porosity phi of the rock plate is obtained through a hole penetration test after the rock plate is manufactured 0 Permeability K 0 The value is used as the permeability parameter phi of the bedrock 0 ，K 0 And calculating to obtain the pore volume V of the rock plate P ＝30×100×1×φ 0 (ii) a (ii) a Several sections of screen pipelines 38, 39, 40, 41 and 42 (shown in fig. 2) are preset and buried in the grooves of the high-temperature high-pressure large-scale section model, are respectively positioned at the upper part, the lower part, the left part, the right part and the middle part of the section model, and are respectively connected to 5 injection ends 43, 44, 45, 46 and 47 of the section model, and 5 injection ends 43, 44, 45, 46 and 47 of the section modelThe ends are respectively connected with valves 9, 10, 11, 12 and 13 for the saturated formation water and the bound water of the profile model; meanwhile, a fluid injection interface and a fluid extraction interface are arranged outside the high-temperature and high-pressure profile model 32, fluid physical property test points are arranged inside the high-temperature and high-pressure profile model, and fluid physical property test probes are distributed on the test points; the injection end of the high-temperature high-pressure large-scale section model 32 is connected with the formation water intermediate container 31, the nitrogen intermediate container 29 and the high-pressure displacement pump 1; the production end of the section model is connected with a vacuum pump 34, a vacuum meter 33, a back pressure valve 35, a glass measuring cylinder 36, a nitrogen intermediate container 30 and a high-pressure displacement pump 2; the high-temperature high-pressure large-scale section model 32 is connected with a data acquisition system 37; meanwhile, the high-temperature high-pressure large-scale section model can rotate at any angle of 360 degrees through the lifting mechanism.
(2) Carrying out vacuum-pumping treatment on the high-temperature high-pressure large-scale section model:
after all the laboratory instruments are connected, the valves 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24 are opened under the condition that all the valves are ensured to be closed, and the rock plates are extracted from the section model 32 through a vacuum pump 34 to be subjected to vacuum treatment; the whole process of vacuumizing lasts for 8 hours, the vacuumizing is stopped until the vacuum meter 33 shows that the vacuum degree reaches-0.08 MPa or below, all valves and the power supply of the vacuum pump are closed, and the vacuumizing process is finished.
(3) Saturated formation water of the high-temperature high-pressure large-scale section model:
firstly, a rock plate 53 is placed in a kettle body device 51 (the kettle body device is shown in figure 3) through a lifting mechanism, and a high-pressure displacement pump 48, a valve 49, a formation water intermediate container 50 and a precision pressure gauge 52 are connected to the exterior of the kettle body device; then opening a valve 49, injecting the formation water in a formation water intermediate container 50 into a kettle body 51 through a high-pressure displacement pump 48, continuously injecting for a period of time, closing the valve 49 until the pressure value displayed by a precision pressure gauge 52 is 10MPa, and stopping injecting; pressurizing saturated formation water by using a high-temperature high-pressure large-scale section model under the condition of keeping the pressure of the kettle body constant at 10MPa, wherein the duration time of the whole process of pressurizing the saturated formation water is 10 hours; after 10 hours, the formation water pressurization saturation process of the high-temperature high-pressure large-scale section model is finished, and the data acquisition system 37 is used for acquiring the water pressure saturation processCollecting the water saturation of each position in the rock plate in real time, and observing whether the stratum water of each position of the rock plate is uniformly and sufficiently saturated or not, if so, ending the whole saturated stratum water process, and if not, repeating the steps again until the stratum water is uniformly saturated and sufficiently saturated; at this point, pressurizing saturated formation water by the high-temperature high-pressure large-scale section model is completed, and the total water volume V injected into the high-temperature high-pressure large-scale section model is recorded wi 。
(4) Building bound water by using a high-temperature high-pressure large-scale section model:
before the high-temperature high-pressure large-scale section model establishes bound water, the section model is vertically placed through a lifting mechanism; the pressure of the back pressure valve 35 is set to 15MPa through the high-pressure displacement pump 2 and the nitrogen intermediate container 30; the screen pipe 38 in the rock plate (the screen pipe in the rock plate is distributed as shown in fig. 2) is located at the top of the profile model 32, the valves 3, 4, 5, 6, 7, 9, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 25, 26, 27 and 28 are opened, the nitrogen in the nitrogen intermediate container 29 is injected into the high-temperature high-pressure large-scale profile model through the high-pressure displacement pump 1, the nitrogen is injected into the rock plate from top to bottom under the condition of considering the gravity separation effect of oil (gas) water until the water outlet end stops discharging, the valve 9 is closed, and the first displacement volume V is recorded 1 Finishing the first step of building bound water; then, the high-temperature high-pressure large-scale section model is rotated by 90 degrees clockwise through the lifting mechanism, the sieve tube pipeline 39 in the rock plate is positioned at the top of the section model 32, the valve 10 is opened, the nitrogen in the nitrogen intermediate container 29 is injected into the high-temperature high-pressure large-scale section model from top to bottom through the high-pressure displacement pump 1 until the outlet end stops discharging water, the valve 10 is closed, and the secondary displacement water volume V is recorded 2 Finishing the second step of establishing bound water; then, the high-temperature high-pressure large-scale section model is rotated by 180 degrees clockwise through the lifting mechanism, the screen pipe line 41 in the rock plate is positioned at the top of the section model 32 at the moment, the valve 12 is opened, the nitrogen in the nitrogen intermediate container 29 is injected into the high-temperature high-pressure large-scale section model from top to bottom through the high-pressure displacement pump 1 until the outlet end stops discharging water, the valve 12 is closed, and the record is recordedObtaining the third driven water volume V 3 The third step of building bound water is finished; then, the high-temperature high-pressure large-scale section model is rotated by 270 degrees clockwise through the lifting mechanism, the sieve tube pipeline 42 in the rock plate is positioned at the top of the section model 32 at the moment, the valve 13 is opened, the nitrogen in the nitrogen intermediate container 29 is injected into the high-temperature high-pressure large-scale section model from top to bottom through the high-pressure displacement pump 1 until the outlet end stops discharging water, the valve 13 is closed, and the fourth displacement volume V is recorded 4 The fourth step of building bound water is finished; finally, opening the valve 11, starting to inject the nitrogen in the nitrogen intermediate container 29 into the high-temperature high-pressure large-scale section model from the middle part through the high-temperature high-pressure displacement pump 1 until the outlet end stops discharging water, closing the valve 11, and recording to obtain the fifth displacement volume V 5 Finishing the fifth step of building bound water; after the five steps of establishing the bound water by the high-temperature high-pressure large-scale section model are completed, all valves are closed, a data acquisition system 37 connected with the high-temperature high-pressure large-scale section model collects the bound water saturation at the corresponding position of the rock plate measured by the fluid physical property test point in real time, the data acquisition system is observed to see whether the bound water saturation at each position of the rock plate is uniform or not and whether the bound water saturation is sufficient or not, if the bound water in the rock plate is uniformly and sufficiently saturated through observation, the whole process of establishing the bound water by the high-temperature high-pressure large-scale section model is ended, if the bound water in each position of the rock plate is not uniformly and sufficiently saturated through observation, the four steps of establishing the bound water are repeated until the bound water at each position of the rock plate is uniformly and sufficiently saturated, all valves are closed, and the process of establishing the bound water by the whole high-temperature high-pressure large-scale section model is ended, and finally recording to obtain the total water yield V w (ii) a At this moment, the establishment of the bound water experimental conditions of the high-temperature high-pressure large-scale section model is completed, and the actual bound water saturation S of the high-temperature high-pressure large-scale section model is finally obtained wi ＝(V wi -V w )/V p 。
The following description is further detailed with reference to a set of specific examples:
a block with the volume of 3000c is manufactured according to the sand filling formula of the high-temperature high-pressure large-scale section modelm 3 The permeability of the flat sand-packed model is 54mD and the porosity is 24% through the pore permeation test, and the pore volume V of the flat sand-packed model is obtained through calculation p Is 720cm 3 The specific parameters are shown in table 1. After the model is vacuumized, pressurizing saturated formation water for the flat sand-packed model in a manner of pressurizing the saturated formation water, and recording to obtain the total volume V of the saturated formation water wi 1085ml, which is about 1.5 times the pore volume of the flat sand pack mold; after the saturated formation water passes through the formation water in the nitrogen displacement flat sand filling model, the volume V of the formation water which is displaced for five times is recorded 1 、V 2 、V 3 、V 4 、V 5 543ml, 216ml, 68ml, 36ml and 13ml respectively, so as to drive out the total volume V of formation water w ＝V 1 +V 2 +V 3 +V 4 +V 5 876 ml; finally, calculating to obtain the saturation S of the irreducible water of the high-temperature high-pressure large-scale section model wi ＝(V wi -V w )/V p ＝(1085-876)/720≈29％。
TABLE 1 Flat Sand-pack model experiment specific parameters
Claims (5)
1. A method for establishing the experimental conditions of the high-temperature high-pressure large-scale section model bound water sequentially comprises the following steps:
(1) making a high-temperature high-pressure large-scale section model, and obtaining the porosity phi of the rock plate through a pore permeation test 0 Permeability K 0 The value is used as the permeability parameter phi of the bedrock 0 、K 0 And calculating to obtain the pore volume V of the rock plate P ＝30×100×1×φ 0 ；
(2) Vacuumizing the high-temperature high-pressure large-scale section model, vacuumizing the model to a negative pressure state by a vacuum pump, keeping the vacuum state constant, and then closing all valves;
(3) carrying out formation water pressurization saturation on the high-temperature high-pressure large-scale section model, and judging whether the rock core formation water is uniformly and fully saturated or not through a data acquisition system;
(4) and (3) building bound water for the high-temperature high-pressure large-scale section model, calculating the saturation degree of the core bound water through a data acquisition system, and judging whether the bound water is uniformly and fully saturated.
2. The method for establishing the water binding experimental condition of the high-temperature high-pressure large-scale section model according to claim 1, wherein in the step (1), the manufactured high-temperature high-pressure large-scale section model is externally provided with a fluid injection interface and a fluid extraction interface, is connected with a data acquisition system and a pressure sensor, is internally provided with fluid physical property test points, the test points are distributed with fluid physical property test probes, and can rotate at any angle of 360 degrees through a lifting mechanism.
3. The method for establishing the water-binding experimental condition of the high-temperature high-pressure large-scale section model according to claim 1, wherein in the step (2), the whole vacuumizing process lasts for more than 8 hours, so that the model is ensured to be completely in a vacuum state.
4. The method for establishing the water-binding experimental condition of the high-temperature high-pressure large-scale profile model according to claim 1, wherein in the step (3), the rock plate is placed in the kettle body device through the lifting mechanism, the formation water is injected into the kettle body through the high-pressure displacement pump, and after the injection is continued for a period of time, the injection is stopped until the pressure value displayed by the pressure gauge is 10 MPa; and pressurizing the saturated formation water by using the high-temperature high-pressure large-scale section model under the condition of keeping the pressure of the kettle body constant at 10MPa, wherein the process duration of the whole pressurized saturated formation water is 10 hours.
5. The method for establishing the water-binding experimental conditions of the high-temperature high-pressure large-scale section model as claimed in claim 1, wherein in the step (4), the model is rotated by 360 degrees through the lifting mechanism, and nitrogen is injected into the high-temperature high-pressure large-scale model from different anglesThe degree profile model starts to inject nitrogen into the rock plate from top to bottom to displace formation water under the condition of considering the gravity differentiation of oil (gas) and water until the water outlet of the extraction end is stopped, and finally records to obtain the total water outlet volume V w So as to obtain the actual saturation S of the irreducible water of the high-temperature high-pressure large-scale section model wi ＝(V wi -V w )/V p 。
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