CN116398116A - Inter-well gas channeling and channeling blocking physical simulation device and simulation method - Google Patents

Abstract

The invention discloses an interwell gas channeling and channeling blocking physical simulation device and a simulation method, comprising a gas reservoir kettle body, a production and injection system and an information acquisition system, wherein the inside of the gas reservoir kettle body simulates stratum conditions, and an injection well, a production well and a monitoring well which are communicated with the bottom of a stratum are arranged above the gas reservoir kettle body; the gas reservoir kettle body is connected with the gas injection system and the information acquisition system, the gas injection system is used for injecting formation fluid and extracting formation fluid, and the information acquisition system comprises a gas monitor, a computer and an information collector and can perform pressure feedback on inter-well interference under different communication degrees; the used fluid and the plugging agent contain the tracer, and the tracer tracker can display the migration condition of the tracer, so that the gas channeling channel is identified, the migration track of the plugging agent is displayed, and the method has important significance for gas reservoir buried gas.

Description

Inter-well gas channeling and channeling blocking physical simulation device and simulation method

Technical Field

The invention belongs to the technical field of injection and production enhancement and particularly relates to an interwell gas channeling and channeling blocking physical simulation device and a simulation method.

Background

The phenomenon of inter-well interference refers to: in the same oil layer, if a plurality of wells are produced simultaneously, the working system of one well is changed, and the bottom hole pressure and the yield of surrounding wells are changed. In the development and exploitation process of oil and gas fields, in order to improve the recovery ratio, modes of carbon dioxide injection, steam injection, nitrogen injection and the like are often adopted. Inter-well interference and well channeling caused by injected gas and produced gas are difficult to avoid. Therefore, the evaluation of the interference and the channeling sealing effect between wells is an important measure for the gas storage technology, and is an important measure for improving the gas storage speed, the gas storage rate and the development benefit.

Chinese patent CN101673482a discloses a method and apparatus for simulating pressure disturbance between multiple wells in a production process, which can simulate and demonstrate the pressure disturbance phenomenon between multiple wells in a production process of a real stratum, and verify the pressure superposition principle. The technical proposal is as follows: firstly, opening the air storage tank, and adjusting the air pressure regulating valve to provide overburden pressure for the simulated stratum; checking the simulated stratum shell to seal the simulated stratum shell from air leakage; then the water pump is started to pump water from the water storage tank to the constant-pressure water tank, when the water level reaches the overflow height, the water supply switch is started to supply water to the simulated stratum until the water level of the pressure measuring pipes reaches the constant-pressure water head height, then the water discharging switch to be produced is started, the pressure drop of each pressure measuring pipe is recorded, then the water discharging switch of the well is closed, and the other water discharging switch is opened; the method can repeatedly simulate the production pressure interference phenomenon in the production process of multiple wells, but does not build a model of the oil and gas reservoir, and the test result has singleness and larger in-and-out with actual working conditions.

Therefore, how to provide an inter-well gas channeling and channeling blocking physical simulation device and a simulation method thereof for effectively evaluating inter-well interference and channeling blocking effects is a problem that needs to be solved by those skilled in the art.

Disclosure of Invention

In view of the above, the invention provides a physical simulation device and a simulation method for gas channeling and sealing channeling among wells, which have small simulation results and actual working conditions, and visual display of effects.

In order to achieve the above purpose, the invention adopts the following technical scheme: an interwell gas channeling and channeling-sealing physical simulation device, comprising:

the gas storage kettle comprises a gas storage kettle body, wherein different simulated storage stratum are arranged in the gas storage kettle body, a plurality of stratum outlets are arranged on the outer side wall of the gas storage kettle body corresponding to the different simulated storage stratum, and a high-pressure gas inlet is arranged on the side wall of the gas storage kettle body;

the high-pressure fluid pressurizing pump is connected with the high-pressure gas inlet and pumps high-pressure fluid into the simulated sequestration stratum;

a fluid reservoir connected to the plurality of formation outlets, respectively, and recording a gas volume of each formation outlet;

the system comprises a gas injection tank, a channeling agent sealing reservoir tank, an injection well, a production well and a booster pump, wherein the injection well and the production well are positioned in a simulated sealing stratum, the injection well and the production well form a loop through pipelines, and the gas injection tank, the channeling agent sealing reservoir tank and the booster pump are connected to the loop;

The information acquisition system comprises a monitoring well, a computer and a tracer tracker, wherein gas monitors for monitoring different simulated sealed stratum gases are arranged on the monitoring well, the tracer tracker is arranged in a gas reservoir kettle body, the tracer tracker acquires position information of the plugging agent and the tracer in the gas and obtains a migration chart of the tracer through the computer, and the computer is connected with the gas monitor through electric signals.

The beneficial effects of the invention are as follows: through the cooperation of the gas reservoir kettle body, the production and injection system and the information acquisition system, various interference and channeling blocking conditions among different wells can be simulated, the functional effects are various, the simulated blocking stratum is close to the actual condition, and the interference and blocking among wells in a high-pressure environment can be simulated; the tracer can identify the gas channeling channel, and the tracer tracker can accurately display the migration condition of the gas and the plugging agent, so that the effect is visual. Corresponding measures can be made by matching with the simulation result to improve the gas sealing speed, the gas burying rate and the development benefit.

Preferably, the gas reservoir kettle body comprises a gas reservoir tank, an upper flange, a lower flange and a warmer, wherein the top and the bottom of the gas reservoir tank are open, the upper flange and the lower flange are respectively and hermetically connected to the top opening and the bottom opening of the gas reservoir tank, the simulated sealing stratum is positioned in the gas reservoir tank, the stratum outlet and the high-pressure gas inlet are respectively formed in the side wall of the gas reservoir tank, and a plurality of threaded holes for connecting an injection well, a production well and a monitoring well are formed in the upper flange.

Preferably, the simulated stratum comprises an overlying stratum, a first stratum, a second stratum, a third stratum, a fourth stratum and a lower stratum which are sequentially arranged from top to bottom, the simulated stratum is manufactured and molded by using a 3D printing technology, the high-pressure gas inlet is correspondingly formed at the top of the first stratum, and a plurality of different stratum outlets are respectively corresponding to the first stratum, the second stratum, the third stratum and the fourth stratum one by one to receive fluids of different strata; the stratum outlets are respectively connected with the fluid reservoir through pipelines, and the pipelines are provided with one-way valves and flow meters.

Preferably, the injection well comprises a first injection well and a second injection well, the production well comprises a first production well and a second production well, the monitoring well comprises a first monitoring well and a second monitoring well, and the top ends of the first injection well, the second injection well, the first production well, the second production well, the first monitoring well and the second monitoring well are respectively provided with external threads matched with threaded holes;

the outer side wall of the first injection well is provided with a first perforation, a second perforation and a third perforation, and the first perforation, the second perforation and the third perforation correspond to different stratum (a first stratum, a second stratum, a third stratum and a fourth stratum); a first valve is arranged on the well wall corresponding to the first perforation, a second valve is arranged on the well wall corresponding to the second perforation, and a third valve is arranged on the well wall corresponding to the third perforation; a fourth perforation, a fifth perforation and a sixth perforation are arranged on the outer side wall of the second injection well; and the fourth perforation, the fifth perforation and the sixth perforation correspond to different stratum, a fourth valve is arranged on the well wall corresponding to the fourth perforation, a fifth valve is arranged on the well wall corresponding to the fifth perforation, and a sixth valve is arranged on the well wall corresponding to the sixth perforation.

Preferably, the top ends of the first extraction well and the second extraction well are provided with discharge ports for fluid to flow out; the outer side wall of the first extraction well is provided with a first extraction outlet, a second extraction outlet and a third extraction outlet; the first extraction port, the second extraction port and the third extraction port correspond to different stratum, and a seventh valve is arranged on a well wall corresponding to the first extraction port; an eighth valve is arranged on the well wall corresponding to the second extraction port, and a ninth valve is arranged on the well wall corresponding to the third extraction port; a fifth extraction outlet, a sixth extraction outlet and a seventh extraction outlet are formed in the outer side wall of the second extraction well; the fifth extraction port, the sixth extraction port and the seventh extraction port respectively correspond to different stratum, and a tenth valve is arranged on a well wall corresponding to the fifth extraction port; an eleventh valve is arranged on the well wall corresponding to the sixth extraction port, and a twelfth valve is arranged on the well wall corresponding to the seventh extraction port.

Preferably, the first monitoring well is located in an overburden stratum, and a cement plugging plate for preventing fluid from passing is arranged in the first monitoring well; a first monitoring port is formed in the side wall of the first monitoring well and below the cement plugging plate, and a first gas monitor is arranged on the inner side wall of the first monitoring well and close to the first monitoring port; the bottom end of the second monitoring well extends to a fourth stratum, a second monitoring port, a third monitoring port, a fourth monitoring port and a fifth monitoring port are arranged on the side wall of the second monitoring well corresponding to different strata, and a second gas monitor, a third gas monitor and a fourth gas monitor are arranged on the side wall of the second monitoring well corresponding to different monitoring ports; the second gas monitor is positioned in the first stratum, the third gas monitor is positioned in the second stratum, the fourth gas monitor is positioned in the third stratum, and the fifth gas monitor is positioned in the fourth stratum; the wellbore section among the second gas monitor, the third gas monitor, the fourth gas monitor and the fifth gas monitor is sealed by a cement plugging plate, and a plugging plate for preventing fluid from passing is arranged inside the second monitoring well and above the second gas monitor.

Preferably, the loop is connected with a control valve, a flowmeter and a one-way valve, the loop is connected with a stirring pump, the gas injection tank and the channeling agent sealing storage tank are respectively connected with the loop through branch lines, and the branch lines are connected with the control valve.

The invention also discloses a method for simulating the gas channeling and the sealing channeling among wells, which comprises the following steps:

step one: assembling and connecting the simulation device: firstly, different simulated sealing stratum are manufactured, a gas reservoir kettle body is assembled, a connection relation is established among the gas reservoir kettle body, a high-pressure fluid booster pump, a fluid reservoir, a mining and injecting system and an information acquisition system to form a simulation device, and then simulation of different interference conditions in the multi-well production process is carried out;

step two: to the simulation that gas flees in the production process of multiwell, record the registration of gas monitor after the return circuit steady voltage between injection well, the production well, change the valve state of injection well, the different degree of depth of production well, simulate the interwell interference process under the different degrees of intercommunication, judge whether the registration changes takes place for gas monitor: according to the data change, evaluating the gas channeling results of different injection and production modes;

step three: the method comprises the steps of simulating gas channeling at high temperature and high pressure in a multi-well production process, recording readings of a gas monitor after circuit pressure stabilization between an injection well and a production well, opening a high-pressure fluid pressurizing pump to enable high-pressure gas to enter a gas reservoir kettle body, recording readings of a monitoring well, judging whether the readings change, judging whether weak stratum fracture occurs between separate strata according to the data change, and further evaluating the occurrence of gas channeling between wells caused by the fact that high-pressure fluid is gathered after drilling into the high-pressure stratum:

Step four: after gas channeling of the stratum in the production process of multiple wells is simulated, according to the second step, the gas content Q of different stratum entering the fluid reservoir is recorded, the channel relation between the fluid reservoir and the different stratum is closed, channeling blocking agent is added into a channeling blocking agent reservoir tank, a channeling blocking agent reservoir tank valve is opened, the time that all the readings tend to be stable is recorded as t, the readings of a gas monitor and a flowmeter are recorded, the preset gas quantity Qb of different stratum flowing into the fluid reservoir is preset, then the channel relation between the fluid reservoir and the different stratum is opened, the real gas quantity Qa of the different stratum entering the fluid reservoir is recorded, the difference value |Qa-Q|/t of the real gas quantity Qa and the gas content Q unit time is calculated as Wa, and the difference value |Qb-Q|/t of the preset gas quantity Qb and the gas content Q unit time is calculated as Wb: if Wa < Wb, the blocking effect of the blocking agent between the corresponding stratum is good;

step five: the position of the tracer in the plugging agent displayed by the tracer tracker received by the information acquisition system can obtain a migration chart of the tracer, so that the plugging effect of the plugging agent can be better judged.

Preferably, in the first step, the simulated sequestration stratum is formed by using a 3D printing technology:

Step a: detecting the actual stratum reservoir position through ultrasonic waves, judging the positions and depths of different strata in the stratum according to the particle size, and determining the distribution condition of the different strata; acquiring position information of different rock strata in the stratum through wireless data, performing 3D modeling, and respectively guiding modeling subunit information into a laser positioning system and a spraying printing system;

step b: according to the information of the modeling subunit, carrying out three-dimensional scaling on the stratum, and coarsening the modeling subunit by adopting a volume average method;

step c: dividing and exporting the 3D modeling model to a laser positioning system;

step d: the sand blasting system and the mud spraying system in the spray printing system automatically control the sand blasting amount and the mud spraying amount according to the size of the modeling subunit;

step e: printing and finally manufacturing and forming.

Preferably, the simulation of gas channeling in a multi-well production process comprises the following steps;

step S1: opening a control valve, a one-way valve, a second valve, a third valve, a fourth valve, a fifth valve and a sixth valve on a pipeline between the gas injection tank and the injection well so that the gas injection tank is communicated with the injection well; gas flows out of the gas injection tank, a portion of the gas enters the first injection well along the pipeline, and enters different formations through the first perforation, the second perforation and the third perforation on the first injection well; a part of gas enters the second injection well and enters different stratum through a fourth perforation, a fifth perforation and a sixth perforation on the second injection well; lasting for 3min;

Step S2: a control valve and a one-way valve on a production well loop are driven; the gas flows out of the gas reservoir kettle body through the first extraction well and the second extraction well and flows into the stirring pump along the pipeline; after stirring by the stirring pump, the gas enters the pressurizing pump by the stirring pump; pressurizing the gas by the pressurizing pump, pumping the gas out, converging the gas flowing out of the gas injection tank along the pipeline, and flowing through the first injection well and the second injection well again along the pipeline to enter the gas reservoir kettle body; stabilizing the pressure until the indication of the flowmeter is kept unchanged and lasting for 2min, recording the indication as a, the indication as b of the second flowmeter and the indication as c of the third flowmeter;

step S3: the method comprises the steps of recording the number of the first gas monitor as A, the number of the second gas monitor as B, the number of the third gas monitor as C, the number of the fourth gas monitor as D and the number of the fifth gas monitor as E;

step S4: simulating inter-well interference processes under different communication degrees by changing the opening and closing states of valves with different depths on a first injection well, a second injection well, a first extraction well and a second extraction well;

step S5: recording the indication number of the first gas monitor as A1, recording the indication number of the second gas monitor as B1, the indication number of the third gas monitor as C1, the indication number of the fourth gas monitor as D1 and the indication number of the fifth gas monitor as E1; recording the indication of the flowmeter as a1, the indication of the second flowmeter as b1 and the indication of the third flowmeter as c1;

Step S6: and judging whether the readings of the first gas monitor, the second gas monitor, the third gas monitor and the fourth gas monitor change, and evaluating the gas channeling results of different injection and production modes according to the data change.

Preferably, the simulation of gas channeling at high temperature and high pressure in a multi-well production process comprises the following steps:

step s1: opening a control valve, a one-way valve, a second valve, a third valve, a fourth valve, a fifth valve, a sixth valve and a heater on a pipeline between the gas injection tank and the injection well so that the gas injection tank is communicated with the injection well; gas flows out of the gas injection tank, a portion of the gas enters the first injection well along the pipeline, and enters different formations through the first perforation, the second perforation and the third perforation on the first injection well; a part of gas enters the second injection well and enters different stratum through a fourth perforation, a fifth perforation and a sixth perforation on the second injection well; lasting for 3min;

step s2: a control valve and a one-way valve on a production well loop are driven; the gas flows out of the gas reservoir kettle body through the first extraction well and the second extraction well and flows into the stirring pump along the pipeline; after stirring by the stirring pump, the gas enters the pressurizing pump by the stirring pump; pressurizing the gas by the pressurizing pump, pumping the gas out, converging the gas flowing out of the gas injection tank along the pipeline, and flowing through the first injection well and the second injection well again along the pipeline to enter the gas reservoir kettle body; stabilizing the pressure until the indication of the flowmeter is kept unchanged and lasting for 2min, recording the indication as a, the indication as b of the second flowmeter and the indication as c of the third flowmeter;

Step s3: the method comprises the steps of recording the number of the first gas monitor as A, the number of the second gas monitor as B, the number of the third gas monitor as C, the number of the fourth gas monitor as D and the number of the fifth gas monitor as E;

step s4: opening a control valve and a one-way valve on a high-pressure fluid pressurizing pump and a casing matching line; the high-pressure fluid pressurizing pump enables high-pressure gas to enter the gas reservoir kettle body through the high-pressure gas inlet along the pipeline;

step s5: recording the indication number of the first gas monitor as A1, recording the indication number of the second gas monitor as B1, the indication number of the third gas monitor as C1, the indication number of the fourth gas monitor as D1 and the indication number of the fifth gas monitor as E1; recording the indication of the flowmeter as a1, the indication of the second flowmeter as b1 and the indication of the third flowmeter as c1;

step s6: and judging whether the readings of the first gas monitor, the second gas monitor, the third gas monitor and the fourth gas monitor are changed, and judging whether the weak stratum between the isolated strata is broken or not according to the data change, thereby evaluating the occurrence of the cross well gas channeling caused by the confluence of high-pressure fluid after drilling into the high-pressure stratum.

Preferably, the plugging simulation after the formation gas channeling occurs in the multi-well production process comprises the following steps:

step a1: after gas channeling occurs, opening the fluid reservoir and the check valves among the fluid reservoir, the first stratum, the second stratum, the third stratum and the fourth stratum, and recording that the gas content of the first stratum flowing into the fluid reservoir is Q1, the gas content of the second stratum flowing into the fluid reservoir is Q2, the gas content of the third stratum flowing into the fluid reservoir is Q3, and the gas content of the fourth stratum flowing into the fluid reservoir is Q4 in 3 min;

step a2: closing the fluid reservoir and the one-way valve between the fluid reservoir and the first, second, third, and fourth formations;

step a3: adding a channeling sealing agent into the channeling sealing agent storage tank, and opening a valve of the channeling sealing agent storage tank;

step a4: recording the time for stabilizing each indication as t and stabilizing for 2min; recording the indication number of the first gas monitor as A2, recording the indication number of the second gas monitor as B2, the indication number of the third gas monitor as C1, the indication number of the fourth gas monitor as D1 and the indication number of the fifth gas monitor as E1; recording the indication of the flowmeter as a1, the indication of the second flowmeter as b1 and the indication of the third flowmeter as c1; setting a preset amount of gas flowing into the fluid reservoir from the first formation to Qb1; the second formation flowing into the fluid reservoir has a preset gas quantity Qb2, the third formation flowing into the fluid reservoir has a preset gas quantity Qb3, and the first formation flowing into the fluid reservoir has a preset gas quantity Qb4;

Step a5: opening one-way valves between the first, second, third, and fourth formations and the fluid reservoir;

step a6: recording the gas content of the first stratum inflow fluid reservoir as Qa1, the gas content of the second stratum inflow fluid reservoir as Qa2, the gas content of the third stratum inflow fluid reservoir as Qa3 and the gas content of the fourth stratum inflow fluid reservoir as Qa4 in 3 min;

step a7: calculating the magnitude of |Qa1-Q1|/t, and recording as Wa1; calculating the magnitude of |Qa2-Q2|/t, and recording as Wa2; calculating the magnitude of |Qa3-Q3|/t; recorded as Wa3; calculating the magnitude of |Qa4-Q4|/t, and recording as Wa4; calculating the magnitude of |Qb1-Q1|/t, and recording as Wb1; calculating the magnitude of |Qb2-Q2|/t, and recording the magnitude as Wb2; calculating the magnitude of |Qb3-Q3|/t; record as Wb3; calculating the magnitude of |Qb4-Q4|/t, and recording as Wb4;

step a8: comparing the sizes of Wa1 and Wb1, wa2 and Wb2, wa3 and Wb3, wa4 and Wb4; if Wa1< Wb1 indicates that the plugging effect of the plugging agent between the first and second formations is good, and vice versa, the comparison of Wa2 with Wb2, wa3 with Wb3, and Wa4 with Wb4 may be similarly indicated.

The beneficial effects of the invention are as follows: the 3D printing technology is utilized to manufacture the simulated oil and gas reservoir model, so that the gas reservoir is more similar to the working condition of a real gas reservoir, the experimental result is more similar to a real value, simulation and evaluation can be made aiming at different inter-well interference and channeling sealing, and the test result is real and accurate.

Drawings

FIG. 1 is a schematic diagram of an interwell gas channeling and channeling-sealing physical simulation device according to the present invention;

FIG. 2 is a cross-sectional view of a gas reservoir tank provided by an embodiment of the present invention;

FIG. 3 is a cross-sectional view of a first injection well and a second injection well according to an embodiment of the present invention;

FIG. 4 is a cross-sectional view of a first production well and a second production well provided by an embodiment of the present invention;

FIG. 5 is a cross-sectional view of a first monitoring well and a second monitoring well according to an embodiment of the present invention;

fig. 6 is a cross-sectional view of a tracer tracker distribution location according to an embodiment of the invention.

1-a booster pump; 2-a flow meter; 3-a stirring pump; 4-a high-pressure fluid pressurizing pump; 5-gas injection tank; 6-a channeling agent seal reservoir; 7-a gas reservoir kettle body; 8-a computer; 9-a second production well; 10-a first injection well; 11-a first monitoring well; 12-a second injection well; 13-a second monitoring well; 14-a second control valve; 15-a third control valve; 16-a sixth control valve; 17-fourth control valve; 18-a first production well; 19-a first one-way valve; 20-a third one-way valve; 21-a high pressure fluid control valve; 23-a fluid reservoir; 24-high pressure fluid check valve; 25-a first control valve; 26-sealing the blowby agent reservoir valve; 27-a second flowmeter; 28-a third flowmeter; 29-a first formation check valve; 30-a second formation check valve; 31-a third formation check valve; 32-fourth formation check valve; 33-tracer tracker; a01-first perforation; a02-a first valve; a03-second perforating; a04-a second valve; a05-third perforation; a06-a third valve; b01-four perforations B01; b02-fourth valve; b03-fifth perforating; b04-fifth valve; b05-sixth perforations; b06-sixth valves; c01-a first extraction port; c02-seventh valve; a second outlet of C03; c04-eighth valve; c05-a third extraction port; c06-ninth valves; d01-a fifth extraction port; d02-tenth valve; d03 sixth outlet; d04-eleventh valve; d05-seventh extraction port; d06-twelfth valve; e01-a first gas monitor; e02-a second monitoring port; f01—a second monitoring port; f02-a second gas monitor; f03-a third monitoring port; f04-a third gas monitor; f05—a fourth monitoring port; f07-a fifth gas monitor; f06 fifth monitoring port.

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.

Referring to fig. 1 to 6 of the drawings, the present invention according to the embodiment of the present invention will be apparent to those skilled in the art.

1-2, the simulation device for evaluating the gas channeling and the sealing channeling between wells provided by the invention comprises an exhausted gas reservoir simulation system, an injection system and an information acquisition system;

referring to fig. 2, the tank 7 includes a tank 117, an upper flange 101, a lower flange 110, a simulated sequestration formation (overburden 103, first formation 104, second formation 105, third formation 106, fourth formation 107, and lower formation 111), an upper flange seal gasket 108, a lower flange seal gasket 109, a high pressure gas inlet 116, a first formation outlet 115, a second formation outlet 114, a third formation outlet 113, a fourth formation outlet 112, and a heater 102; the upper end of the gas reservoir tank 117 is connected with the upper flange 101 through bolts and sealed through an upper flange sealing gasket 108, and the lower end of the gas reservoir tank 117 is connected with the lower flange 110 through bolts and sealed through a lower flange sealing gasket 109; the high-pressure gas inlet 116 is positioned at the side end of the gas reservoir 117, and high-pressure fluid enters the simulated sequestration stratum through the high-pressure gas inlet 116; the first formation outlet 115, the second formation outlet 114, the third formation outlet 113, and the fourth formation outlet 112 are located at the side end of the gas reservoir tank 117, and the gas of different formations (first formation, second formation, third formation, and fourth formation) in the gas reservoir tank 117 enters the fluid reservoir 23 through the first formation outlet 115, the second formation outlet 114, the third formation outlet 113, and the fourth formation outlet 112; the fluid reservoir 23 can record the volumes of gas from the first formation outlet 115, the second formation outlet 114, the third formation outlet 113, and the fourth formation outlet 112, respectively; the simulated sealing stratum is placed in the gas reservoir kettle body 7;

Referring to fig. 1, the production and injection system includes a gas injection tank 5, a channeling agent reservoir tank 6, a first injection well 10, a second injection well 12, a first production well 18, a second production well 9, a stirring pump 3, a pressurizing pump 1, a flow meter 2, and a fluid reservoir 23;

the information acquisition system comprises a first monitoring well 11, a second monitoring well 13, a computer 8, an information collector and a tracer tracker 33;

the simulated sealing stratum is manufactured by using a 3D printing technology, and each stratum area is printed by adopting different materials according to the actual stratum reality;

the tracer trackers 33 are uniformly distributed on the inner surface of the gas reservoir kettle body, so that the positions of the tracer in the plugging agent can be tracked, and the plugging condition of the plugging agent is presented through a computer;

the upper ends of the first injection well 10, the second injection well 12, the first extraction well 18, the second extraction well 9, the first monitoring well 11 and the second monitoring well 13 are provided with external thread segments which can be matched with the internal thread segments arranged on the upper flange 101;

the ends of the first injection well 10 and the second injection well 12 are provided with inlet openings for connection of fluid devices; the side wall of the first injection well 10 is provided with a first perforation A01, a second perforation A03 and a third perforation A05; a first valve A02 is arranged on the well wall corresponding to the first perforation A01, a second valve A04 is arranged on the well wall corresponding to the second perforation A03, and a third valve A06 is arranged on the well wall corresponding to the third perforation A05; the side end of the second injection well 12 is provided with a fourth perforation B01, a fifth perforation B03 and a sixth perforation B05; a fourth valve B02 is arranged on the well wall corresponding to the fourth perforation B01, a fifth valve B04 is arranged on the well wall corresponding to the fifth perforation B03, and a sixth valve B06 is arranged on the well wall corresponding to the sixth perforation B05;

The ends of the first extraction well 18 and the second extraction well 9 are provided with discharge ports for fluid to flow out; the side wall of the first extraction well 18 is provided with a first extraction outlet C01, a second extraction outlet C03 and a third extraction outlet C05; a seventh valve C02 is arranged on the well wall corresponding to the first extraction port C01; an eighth valve C04 is arranged on the well wall corresponding to the second extraction port C03, and a ninth valve C06 is arranged on the well wall corresponding to the third extraction port C05; the side end of the second extraction well 9 is provided with a fifth extraction port D01, a sixth extraction port D03 and a seventh extraction port D05; a tenth valve D02 is arranged on the well wall corresponding to the fifth extraction port D01; an eleventh valve D04 is arranged on the well wall corresponding to the sixth extraction port D03, and a twelfth valve D06 is arranged on the well wall corresponding to the seventh extraction port D05;

the middle parts of the first monitoring well 11 and the second monitoring well 13 are plugged by cement, and fluid cannot enter the first monitoring well 11 and the second monitoring well 13; the depth of the first monitoring well 11 is positioned on the overburden layer 103, a first gas monitor E01 is arranged at the side end of the first monitoring well 11, and the first gas monitor E01 is positioned at the lower end of the plugging position; the depth of the second monitoring well 13 is in the fourth stratum 107, and a second gas monitor F02, a third gas monitor F04 and a fourth gas monitor F06 are arranged on the side wall of the second monitoring well 13; the second gas monitor F02 is located at the first formation 104, the second gas monitor F02 is located at the second formation 105, the fourth gas monitor F06 is located at the third formation 106, and the fifth gas monitor F07 is located at the fourth formation 107; plugging a cement sheath in a shaft section among the second gas monitor F02, the third gas monitor F04, the fourth gas monitor F06 and the fifth monitoring F07, wherein fluid cannot pass through the cement sheath;

The preparation of the simulated sealing stratum mainly comprises the following steps:

step 1: detecting the actual stratum reservoir position through ultrasonic waves, judging the positions and depths of different strata in the stratum according to the particle size, and determining the distribution condition of the different strata; acquiring position information of different rock strata in the stratum through wireless data, performing 3D modeling, and respectively guiding modeling subunit information into a laser positioning system and a spraying printing system;

step 2: according to the information of the modeling subunit, carrying out three-dimensional scaling on the stratum, and coarsening the modeling subunit by adopting a volume average method;

step 3: dividing and exporting the 3D modeling model to a laser positioning system;

step 4: the sand blasting system and the mud spraying system in the spray printing system automatically control the sand blasting amount and the mud spraying amount according to the size of the modeling subunit;

step 5: printing;

the simulation of the gas channeling comprises the following steps:

step 1: the first control valve 25, the second control valve 14, the third control valve 15, the first check valve 19, the first valve a02, the second valve a04, the third valve a06, the fourth valve B02, the fifth valve B04, and the sixth valve B06 are opened. After flowing out of the gas injection tank 5 and passing through the first check valve 19 of the first control valve 25 along the pipeline (conduit), a part of the gas enters the first injection well 10 through the second control valve 14 and enters different formations through the first perforation a01, the second perforation a03 and the third perforation a05 on the first injection well 10; a part of the gas enters the second injection well 12 through the third control valve 15 and enters different formations through the fourth perforation B01, the fifth perforation B03 and the sixth perforation B05 on the second injection well 12; lasting for 3min;

Step 2: opening the second check valve 28, the third check valve 20, the fourth control valve 17 and the sixth control valve 16; the gas flows out of the gas reservoir kettle body 7 through the first extraction well 18 and the second extraction well 9, flows into the stirring pump 3 along the conduit through the second one-way valve 28; after stirring by the stirring pump 3, the gas will enter the pressurizing pump 1 by the stirring pump 3; the pressurizing pump 1 pressurizes the gas and pumps the gas out, the gas flows through the third one-way valve 20 along the guide pipe, then merges with the gas flowing out of the gas injection tank 5, and flows through the first one-way valve 19, the first injection well 10 and the second injection well 12 along the guide pipe again to enter the gas reservoir kettle 7; stabilizing the pressure until the reading of the flowmeter 2 is kept unchanged and lasting for 2min, and recording the reading as a; recording the indication of the second flowmeter 27 as b; the indication of the third flowmeter 28 is recorded as c;

step 3: the number of the first gas monitor E01 is marked as A, the number of the second gas monitor F02 is marked as B, the number of the third gas monitor F04 is marked as C, the number of the fourth gas monitor F06 is marked as D, and the number of the fifth gas monitor F07 is marked as E;

step 4: simulating inter-well interference processes under different communication degrees by changing the opening and closing states of valves with different depths on the first injection well 10, the second injection well 12, the first production well 18 and the second production well 9;

Step 5: recording the indication number of the first gas monitor E01 as A1, recording the indication number of the second gas monitor F02 as B1, the indication number of the third gas monitor F04 as C1, the indication number of the fourth gas monitor F06 as D1 and the indication number of the fifth gas monitor F07 as E1; recording the indication of the flowmeter 2 as a1, the indication of the second flowmeter 31 as b1, and the indication of the third flowmeter 32 as c1;

step 6: judging whether the readings of the first gas monitor E01, the second gas monitor F02, the third gas monitor F04 and the fourth gas monitor F06 change or not, and evaluating the gas channeling results of different injection and production modes according to the data change;

for the gas channeling simulation at high temperature and high pressure, the method comprises the following steps:

step 1: the first control valve 25, the second control valve 14, the third control valve 15, the first check valve 19, the first valve a02, the second valve a04, the third valve a06, the fourth valve B02, the fifth valve B04, the sixth valve B06, and the heater 102 are opened. After flowing out of the gas injection tank 5 and passing through the first control valve 25 and the first check valve 19 along the conduit, a part of the gas enters the first injection well 10 through the second control valve 14 and enters different formations through the first perforation a01, the second perforation a03 and the third perforation a05 on the first injection well 10; a part of the gas enters the second injection well 12 through the third control valve 15 and enters different formations through the fourth perforation B01, the fifth perforation B03 and the sixth perforation B05 on the second injection well 12; lasting for 3min;

Step 2: opening the second check valve 28, the third check valve 20, the fourth control valve 17 and the sixth control valve 16; the gas flows out of the gas reservoir kettle body 7 through the first extraction well 18 and the second extraction well 9, flows into the stirring pump 3 along the conduit through the second one-way valve 28; after stirring by the stirring pump 3, the gas will enter the pressurizing pump 1 by the stirring pump 3; the pressurizing pump 1 pressurizes the gas and pumps the gas out, the gas flows through the third one-way valve 20 along the guide pipe, then merges with the gas flowing out of the gas injection tank 5, and flows through the first one-way valve 19, the first injection well 10 and the second injection well 12 along the guide pipe again to enter the gas reservoir kettle 7; stabilizing the pressure until the reading of the flowmeter 2 is kept unchanged and lasting for 2min, and recording the reading as a; recording the indication of the second flowmeter 27 as b; the indication of the third flowmeter 28 is recorded as c;

step 3: the number of the first gas monitor E01 is marked as A, the number of the second gas monitor F02 is marked as B, the number of the third gas monitor F04 is marked as C, the number of the fourth gas monitor F06 is marked as D, and the number of the fifth gas monitor F07 is marked as E;

step 4: opening the high-pressure fluid control valve 21, the high-pressure fluid check valve 24, and the high-pressure fluid pressurizing pump 4; the high-pressure fluid pressurizing pump 4 enables high-pressure gas to enter the gas reservoir kettle body 7 along the guide pipe through the high-pressure fluid control valve 21, the high-pressure fluid one-way valve 24 and the high-pressure gas inlet 116;

Step 5, recording the indication number of the first gas monitor E01 as A1, recording the indication number of the second gas monitor F02 as B1, the indication number of the third gas monitor F04 as C1, the indication number of the fourth gas monitor F06 as D1 and the indication number of the fifth gas monitor F07 as E1; recording the indication of the flowmeter 2 as a1, the indication of the second flowmeter 27 as b1, and the indication of the third flowmeter 28 as c1;

step 6: judging whether the readings of the first gas monitor E01, the second gas monitor F02, the third gas monitor F04 and the fourth gas monitor F06 change, and judging whether weak stratum fracture occurs between the stratums according to the data change, thereby evaluating the occurrence of well gas channeling caused by the confluence of high-pressure fluid after drilling into the high-pressure stratum;

the plugging simulation after the formation gas channeling occurs comprises the following steps:

step 1: after the occurrence of the gas channeling, the first formation check valve 29, the second formation check valve 30, the third formation check valve 31, and the fourth formation check valve 32 are opened; the gas content flowing into the fluid reservoir 23 through the first formation check valve 29 in 3 minutes was Q1, the gas content flowing into the fluid reservoir 23 through the second formation check valve 30 was Q2, the gas content flowing into the fluid reservoir 23 through the third formation check valve 31 was Q3, and the gas content flowing into the fluid reservoir 23 through the fourth formation check valve 32 was Q4;

Step 2: closing the first formation check valve 29, the second formation check valve 30, the third formation check valve 31, the fourth formation check valve 32, and the first control valve 25;

step 3: adding a channeling blocking agent into the channeling blocking agent reservoir tank 6, and opening the channeling blocking agent reservoir tank valve 26;

step 4: recording the time for stabilizing each display number as t and stabilizing for 2min; recording the indication number of the first gas monitor E01 as A2, recording the indication number of the second gas monitor F02 as B2, the indication number of the third gas monitor F04 as C1, the indication number of the fourth gas monitor F06 as D1 and the indication number of the fifth gas monitor F07 as E1; recording the indication of the flowmeter 2 as a1, the indication of the second flowmeter 27 as b1, and the indication of the third flowmeter 28 as c1; setting a preset amount of gas flowing into the fluid reservoir from the first formation to Qb1; the second formation flowing into the fluid reservoir has a preset gas quantity Qb2, the third formation flowing into the fluid reservoir has a preset gas quantity Qb3, and the first formation flowing into the fluid reservoir has a preset gas quantity Qb4;

step 4: opening the first formation check valve 29, the second formation check valve 30, the third formation check valve 31, and the fourth formation check valve 32;

step 5: recording the gas content Qa1 flowing into the fluid reservoir 23 through the first formation check valve 29, the gas content Qa2 flowing into the fluid reservoir 23 through the second formation check valve 30, the gas content Qa3 flowing into the fluid reservoir 23 through the third formation check valve 31, and the gas content Qa4 flowing into the fluid reservoir 23 through the fourth formation check valve 32 in 3 min;

Step 6: calculating the magnitude of |Qa1-Q1|/t, and recording as Wa1; calculating the magnitude of |Qa2-Q2|/t, and recording as Wa2; calculating the magnitude of |Qa3-Q3|/t; recorded as Wa3; calculating the magnitude of |Qa4-Q4|/t, and recording as Wa4; calculating the magnitude of |Qb1-Q1|/t, and recording as Wb1; calculating the magnitude of |Qb2-Q2|/t, and recording the magnitude as Wb2; calculating the magnitude of |Qb3-Q3|/t; record as Wb3; calculating the magnitude of |Qb4-Q4|/t, and recording as Wb4;

step 7: the sizes of Wa1 and Wb1, wa2 and Wb2, wa3 and Wb3, wa4 and Wb4 were compared. If Wa1< Wb1 indicates that the plugging effect of the plugging agent between the first and second formations is good, and vice versa, the comparison of Wa2 with Wb2, wa3 with Wb3, and Wa4 with Wb4 may be similarly indicated.

Step 8: the migration map of the tracer can be obtained according to the position of the tracer in the plugging agent, which is displayed by the tracer tracker 33 and received by the information acquisition system 15, so that the plugging effect of the plugging agent can be better judged.

The system is used for injecting formation fluid and extracting formation fluid, and the information acquisition system comprises a gas monitor, a computer and an information collector, and can perform pressure feedback on inter-well interference under different communication degrees; the used fluid and the plugging agent contain the tracer, and the tracer tracker can display the migration condition of the tracer, so that the gas channeling channel is identified, the migration track of the plugging agent is displayed, and the method has important significance for gas reservoir buried gas.

For the device and the use method disclosed in the embodiments, since the device and the use method correspond to the method disclosed in the embodiments, the description is relatively simple, and the relevant places 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. An interwell gas channeling and channeling blocking physical simulation device, comprising:

the gas storage kettle comprises a gas storage kettle body, wherein different simulated storage stratum are arranged in the gas storage kettle body, a plurality of stratum outlets are arranged on the outer side wall of the gas storage kettle body corresponding to the different simulated storage stratum, and a high-pressure gas inlet is arranged on the side wall of the gas storage kettle body;

the high-pressure fluid pressurizing pump is connected with the high-pressure gas inlet and pumps high-pressure fluid into the simulated sequestration stratum;

A fluid reservoir connected to the plurality of formation outlets, respectively, and recording a gas volume of each formation outlet;

the system comprises a gas injection tank, a channeling agent sealing reservoir tank, an injection well, a production well and a booster pump, wherein the injection well and the production well are positioned in a simulated sealing stratum, the injection well and the production well form a loop through pipelines, and the gas injection tank, the channeling agent sealing reservoir tank and the booster pump are connected to the loop;

the information acquisition system comprises a monitoring well, a computer and a tracer tracker, wherein gas monitors for monitoring different simulated sealed stratum gases are arranged on the monitoring well, the tracer tracker is arranged in a gas reservoir kettle body, the tracer tracker acquires position information of the plugging agent and the tracer in the gas and obtains a migration chart of the tracer through the computer, and the computer is connected with the gas monitor through electric signals.

2. The physical simulation device for gas channeling and blocking channeling among wells, as set forth in claim 1, wherein the gas reservoir tank body comprises a gas reservoir tank, an upper flange, a lower flange and a warmer, the top and bottom of the gas reservoir tank are opened, the upper flange and the lower flange are respectively and hermetically connected at the top opening and the bottom opening of the gas reservoir tank, the simulated blocking stratum is positioned in the gas reservoir tank, the stratum outlet and the high-pressure gas inlet are respectively opened on the side wall of the gas reservoir tank, and the upper flange is opened with a plurality of threaded holes for connecting an injection well, a production well and a monitoring well; the simulated stratum comprises an overlying stratum, a first stratum, a second stratum, a third stratum, a fourth stratum and a lower stratum which are sequentially arranged from top to bottom, the simulated stratum is manufactured and molded by using a 3D printing technology, the high-pressure gas inlet is correspondingly formed in the top of the first stratum, and a plurality of different stratum outlets are respectively corresponding to the first stratum, the second stratum, the third stratum and the fourth stratum one by one to receive fluids of different strata; the plurality of different stratum outlets are respectively connected with the fluid reservoir through a plurality of pipelines, and the pipelines are respectively provided with one-way valves and flowmeters for recording the fluid amounts of different stratum.

3. The physical simulation device for gas channeling and sealing channeling between wells according to claim 2, wherein the injection wells comprise a first injection well and a second injection well, the production well comprises a first production well and a second production well, the monitoring well comprises a first monitoring well and a second monitoring well, and the top ends of the first injection well, the second injection well, the first production well, the second production well, the first monitoring well and the second monitoring well are respectively provided with external threads matched with threaded holes;

the outer side wall of the first injection well is provided with a first perforation, a second perforation and a third perforation, and the first perforation, the second perforation and the third perforation correspond to different stratum; a first valve is arranged on the well wall corresponding to the first perforation, a second valve is arranged on the well wall corresponding to the second perforation, and a third valve is arranged on the well wall corresponding to the third perforation; a fourth perforation, a fifth perforation and a sixth perforation are arranged on the outer side wall of the second injection well; and the fourth perforation, the fifth perforation and the sixth perforation correspond to different stratum, a fourth valve is arranged on the well wall corresponding to the fourth perforation, a fifth valve is arranged on the well wall corresponding to the fifth perforation, and a sixth valve is arranged on the well wall corresponding to the sixth perforation.

4. The physical simulation device for gas channeling and blocking channeling among wells according to claim 3, wherein the top ends of the first extraction well and the second extraction well are provided with a discharge port for fluid to flow out; the outer side wall of the first extraction well is provided with a first extraction outlet, a second extraction outlet and a third extraction outlet; the first extraction port, the second extraction port and the third extraction port correspond to different stratum, and a seventh valve is arranged on a well wall corresponding to the first extraction port; an eighth valve is arranged on the well wall corresponding to the second extraction port, and a ninth valve is arranged on the well wall corresponding to the third extraction port; a fifth extraction outlet, a sixth extraction outlet and a seventh extraction outlet are formed in the outer side wall of the second extraction well; the fifth extraction port, the sixth extraction port and the seventh extraction port respectively correspond to different stratum, and a tenth valve is arranged on a well wall corresponding to the fifth extraction port; an eleventh valve is arranged on the well wall corresponding to the sixth extraction port, and a twelfth valve is arranged on the well wall corresponding to the seventh extraction port.

5. The physical simulation device for gas channeling and sealing channeling between wells according to claim 4, wherein the first monitoring well is located in an overburden layer, and a cement plugging plate for preventing the passage of fluid is arranged inside the first monitoring well; a first monitoring port is formed in the side wall of the first monitoring well and below the cement plugging plate, and a first gas monitor is arranged on the inner side wall of the first monitoring well and close to the first monitoring port; the bottom end of the second monitoring well extends to a fourth stratum, a second monitoring port, a third monitoring port, a fourth monitoring port and a fifth monitoring port are arranged on the side wall of the second monitoring well corresponding to different strata, and a second gas monitor, a third gas monitor and a fourth gas monitor are arranged on the side wall of the second monitoring well corresponding to different monitoring ports; the second gas monitor is positioned in the first stratum, the third gas monitor is positioned in the second stratum, the fourth gas monitor is positioned in the third stratum, and the fifth gas monitor is positioned in the fourth stratum; the wellbore section among the second gas monitor, the third gas monitor, the fourth gas monitor and the fifth gas monitor is sealed by a cement plugging plate, and a plugging plate for preventing fluid from passing is arranged inside the second monitoring well and above the second gas monitor.

6. The physical simulation device for gas channeling and channeling sealing of wells according to claim 5, wherein a control valve, a flowmeter and a one-way valve are connected to the loop, a stirring pump is connected to the loop, the gas injection tank and the channeling sealing agent reservoir tank are connected to the loop through branch lines, and the control valve is connected to the branch lines.

7. An interwell gas channeling and seal channeling simulation method using the simulation device according to claim 6, characterized by comprising the steps of:

step one: assembling and connecting the simulation device: firstly, different simulated sealing stratum are manufactured, a gas reservoir kettle body is assembled, a connection relation is established among the gas reservoir kettle body, a high-pressure fluid pressurizing pump, a fluid reservoir, a mining and injecting system and an information acquisition system to form a simulation device, and then simulation of different interference conditions in the multi-well production process is carried out;

step two: to the simulation that gas flees in the production process of multiwell, record the registration of gas monitor after the return circuit steady voltage between injection well, the production well, change the valve state of injection well, the different degree of depth of production well, simulate the interwell interference process under the different degrees of intercommunication, judge whether the registration changes takes place for gas monitor: according to the data change, evaluating the gas channeling results of different injection and production modes;

Step three: the method comprises the steps of simulating gas channeling at high temperature and high pressure in a multi-well production process, recording readings of a gas monitor after circuit pressure stabilization between an injection well and a production well, opening a high-pressure fluid pressurizing pump to enable high-pressure gas to enter a gas reservoir kettle body, recording readings of a monitoring well, judging whether the readings change, judging whether weak stratum fracture occurs between separate strata according to the data change, and further evaluating the occurrence of gas channeling between wells caused by the fact that high-pressure fluid is gathered after drilling into the high-pressure stratum:

step four: after gas channeling of the stratum in the production process of multiple wells is simulated, according to the second step, the gas content Q of different stratum entering the fluid reservoir is recorded, the channel relation between the fluid reservoir and the different stratum is closed, channeling blocking agent is added into a channeling blocking agent reservoir tank, a channeling blocking agent reservoir tank valve is opened, the time that all the readings tend to be stable is recorded as t, the readings of a gas monitor and a flowmeter are recorded, the preset gas quantity Qb of different stratum flowing into the fluid reservoir is preset, then the channel relation between the fluid reservoir and the different stratum is opened, the real gas quantity Qa of the different stratum entering the fluid reservoir is recorded, the difference value |Qa-Q|/t of the real gas quantity Qa and the gas content Q unit time is calculated as Wa, and the difference value |Qb-Q|/t of the preset gas quantity Qb and the gas content Q unit time is calculated as Wb: if Wa < Wb, the blocking effect of the blocking agent between the corresponding stratum is good;

Step five: the position of the tracer in the plugging agent displayed by the tracer tracker received by the information acquisition system can obtain a migration chart of the tracer, so that the plugging effect of the plugging agent can be better judged.

8. The method for simulating gas channeling and sealing channeling in wells according to claim 7, wherein the simulation of gas channeling in the production process of multiple wells comprises the steps of;

step S1: opening a control valve, a one-way valve, a second valve, a third valve, a fourth valve, a fifth valve and a sixth valve on a pipeline between the gas injection tank and the injection well so that the gas injection tank is communicated with the injection well; gas flows out of the gas injection tank, a portion of the gas enters the first injection well along the pipeline, and enters different formations through the first perforation, the second perforation and the third perforation on the first injection well; a part of gas enters the second injection well and enters different stratum through a fourth perforation, a fifth perforation and a sixth perforation on the second injection well; lasting for 3min;

step S2: a control valve and a one-way valve on a production well loop are driven; the gas flows out of the gas reservoir kettle body through the first extraction well and the second extraction well and flows into the stirring pump along the pipeline; after stirring by the stirring pump, the gas enters the pressurizing pump by the stirring pump; pressurizing the gas by the pressurizing pump, pumping the gas out, converging the gas flowing out of the gas injection tank along the pipeline, and flowing through the first injection well and the second injection well again along the pipeline to enter the gas reservoir kettle body; stabilizing the pressure until the indication of the flowmeter is kept unchanged and lasting for 2min, recording the indication as a, the indication as b of the second flowmeter and the indication as c of the third flowmeter;

Step S3: the method comprises the steps of recording the number of the first gas monitor as A, the number of the second gas monitor as B, the number of the third gas monitor as C, the number of the fourth gas monitor as D and the number of the fifth gas monitor as E;

step S4: simulating inter-well interference processes under different communication degrees by changing the opening and closing states of valves with different depths on a first injection well, a second injection well, a first extraction well and a second extraction well;

step S5: recording the indication number of the first gas monitor as A1, recording the indication number of the second gas monitor as B1, the indication number of the third gas monitor as C1, the indication number of the fourth gas monitor as D1 and the indication number of the fifth gas monitor as E1; recording the indication of the flowmeter as a1, the indication of the second flowmeter as b1 and the indication of the third flowmeter as c1;

step S6: and judging whether the readings of the first gas monitor, the second gas monitor, the third gas monitor and the fourth gas monitor change, and evaluating the gas channeling results of different injection and production modes according to the data change.

9. The method for simulating cross-well gas channeling and sealing channeling of claim 7, wherein the simulation of gas channeling at high temperature and high pressure during the production process of multiple wells comprises the steps of:

Step s1: opening a control valve, a one-way valve, a second valve, a third valve, a fourth valve, a fifth valve, a sixth valve and a heater on a pipeline between the gas injection tank and the injection well so that the gas injection tank is communicated with the injection well; gas flows out of the gas injection tank, a portion of the gas enters the first injection well along the pipeline, and enters different formations through the first perforation, the second perforation and the third perforation on the first injection well; a part of gas enters the second injection well and enters different stratum through a fourth perforation, a fifth perforation and a sixth perforation on the second injection well; lasting for 3min;

step s2: a control valve and a one-way valve on a production well loop are driven; the gas flows out of the gas reservoir kettle body through the first extraction well and the second extraction well and flows into the stirring pump along the pipeline; after stirring by the stirring pump, the gas enters the pressurizing pump by the stirring pump; pressurizing the gas by the pressurizing pump, pumping the gas out, converging the gas flowing out of the gas injection tank along the pipeline, and flowing through the first injection well and the second injection well again along the pipeline to enter the gas reservoir kettle body; stabilizing the pressure until the indication of the flowmeter is kept unchanged and lasting for 2min, recording the indication as a, the indication as b of the second flowmeter and the indication as c of the third flowmeter;

Step s3: the method comprises the steps of recording the number of the first gas monitor as A, the number of the second gas monitor as B, the number of the third gas monitor as C, the number of the fourth gas monitor as D and the number of the fifth gas monitor as E;

step s4: opening a control valve and a one-way valve on a high-pressure fluid pressurizing pump and a casing matching line; the high-pressure fluid pressurizing pump enables high-pressure gas to enter the gas reservoir kettle body through the high-pressure gas inlet along the pipeline;

step s5: recording the indication number of the first gas monitor as A1, recording the indication number of the second gas monitor as B1, the indication number of the third gas monitor as C1, the indication number of the fourth gas monitor as D1 and the indication number of the fifth gas monitor as E1; recording the indication of the flowmeter as a1, the indication of the second flowmeter as b1 and the indication of the third flowmeter as c1;

step s6: and judging whether the readings of the first gas monitor, the second gas monitor, the third gas monitor and the fourth gas monitor are changed, and judging whether the weak stratum between the isolated strata is broken or not according to the data change, thereby evaluating the occurrence of the cross well gas channeling caused by the confluence of high-pressure fluid after drilling into the high-pressure stratum.

10. The method for simulating cross-well gas channeling and sealing channeling of claim 7, wherein the method for simulating sealing channeling after formation gas channeling in the production process of multiple wells comprises the following steps:

step a1: after gas channeling occurs, opening the fluid reservoir and the check valves among the fluid reservoir, the first stratum, the second stratum, the third stratum and the fourth stratum, and recording that the gas content of the first stratum flowing into the fluid reservoir is Q1, the gas content of the second stratum flowing into the fluid reservoir is Q2, the gas content of the third stratum flowing into the fluid reservoir is Q3, and the gas content of the fourth stratum flowing into the fluid reservoir is Q4 in 3 min;

step a2: closing the fluid reservoir and the one-way valve between the fluid reservoir and the first, second, third, and fourth formations;

step a3: adding a channeling sealing agent into the channeling sealing agent storage tank, and opening a valve of the channeling sealing agent storage tank;

step a4: recording the time for stabilizing each indication as t and stabilizing for 2min; recording the indication number of the first gas monitor as A2, recording the indication number of the second gas monitor as B2, the indication number of the third gas monitor as C1, the indication number of the fourth gas monitor as D1 and the indication number of the fifth gas monitor as E1; recording the indication of the flowmeter as a1, the indication of the second flowmeter as b1 and the indication of the third flowmeter as c1; setting a preset amount of gas flowing into the fluid reservoir from the first formation to Qb1; the second formation flowing into the fluid reservoir has a preset gas quantity Qb2, the third formation flowing into the fluid reservoir has a preset gas quantity Qb3, and the first formation flowing into the fluid reservoir has a preset gas quantity Qb4;

Step a5: opening one-way valves between the first, second, third, and fourth formations and the fluid reservoir;

step a6: recording the gas content of the first stratum inflow fluid reservoir as Qa1, the gas content of the second stratum inflow fluid reservoir as Qa2, the gas content of the third stratum inflow fluid reservoir as Qa3 and the gas content of the fourth stratum inflow fluid reservoir as Qa4 in 3 min;

step a7: calculating the magnitude of |Qa1-Q1|/t, and recording as Wa1; calculating the magnitude of |Qa2-Q2|/t, and recording as Wa2; calculating the magnitude of |Qa3-Q3|/t; recorded as Wa3; calculating the magnitude of |Qa4-Q4|/t, and recording as Wa4; calculating the magnitude of |Qb1-Q1|/t, and recording as Wb1; calculating the magnitude of |Qb2-Q2|/t, and recording the magnitude as Wb2; calculating the magnitude of |Qb3-Q3|/t; record as Wb3; calculating the magnitude of |Qb4-Q4|/t, and recording as Wb4;

step a8: comparing the sizes of Wa1 and Wb1, wa2 and Wb2, wa3 and Wb3, wa4 and Wb4; if Wa1< Wb1 indicates that the plugging effect of the plugging agent between the first and second formations is good, and vice versa, the comparison of Wa2 with Wb2, wa3 with Wb3, and Wa4 with Wb4 may be similarly indicated.

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