A physical simulation device and method for inter-well gas channeling and sealing channeling

Abstract

The invention discloses a physical simulation device and method for inter-well gas channeling and plugging, comprising a gas reservoir kettle, a production and injection system and an information collection system. The gas reservoir kettle simulates formation conditions inside, and an injection well, a production well and a monitoring well connected to the bottom of the formation are arranged above the gas reservoir kettle; the production and injection system and the information collection system are connected to the gas reservoir kettle, the production and injection system is used for injecting formation fluid and producing formation fluid, the information collection system comprises a gas monitor, a computer and an information collector, and can give pressure feedback to well-to-well interference under different degrees of connectivity; the used fluid and plugging agent contain tracers, and the tracer tracker can display the migration of the tracer, thereby identifying the gas channeling channel and displaying the migration trajectory of the plugging agent, which is of great significance to the buried gas in the gas reservoir.

Description

Technical Field

[0001] The invention belongs to the technical field of injection-production enhanced oil recovery, and in particular relates to a physical simulation device and method for inter-well gas channeling and sealing. Background Art

[0002] Well interference refers to the phenomenon that if there are multiple wells producing at the same time in the same oil layer, if the working system of one of the wells changes, the bottom hole pressure and production of the surrounding wells will change. In the process of oil and gas field development and exploitation, in order to improve the recovery rate, carbon dioxide injection, steam injection, nitrogen injection and other methods are often used. Well interference and well channeling caused by injected gas and produced gas are difficult to avoid. Therefore, evaluating well interference and channeling effects is an important measure for gas storage technology, and it is also an important means to increase the gas storage speed, improve the gas storage rate and development benefits.

[0003] Chinese patent CN101673482A discloses a method and device for simulating pressure interference between multiple well production wells, which can simulate and demonstrate the pressure interference phenomenon between multiple well production wells in real formations and verify the principle of pressure superposition. Its technical scheme is: first open the gas storage tank, adjust the air pressure regulating valve, and provide overburden pressure for the simulated formation; check the simulated formation shell to make it airtight; then turn on the water pump to pump water from the water storage tank to the constant pressure water tank, and when the water level reaches the overflow height, turn on the water supply switch to supply water to the simulated formation until the water level of the pressure measuring tube reaches the constant pressure head height, then turn on the water discharge switch of the planned production well, record the pressure drop of each pressure measuring tube, then turn off the water discharge switch of this well, and turn on another one; this method can repeatedly simulate the production pressure interference phenomenon in the multi-well production process, but does not establish a model of the oil and gas reservoir, and the test results are single and vary greatly from the actual working conditions.

[0004] Therefore, how to provide a physical simulation device and simulation method for inter-well gas crosstalk and crosstalk sealing that can effectively evaluate inter-well interference and crosstalk sealing effects is an urgent problem that technicians in this field need to solve. Summary of the invention

[0005] In view of this, the present invention provides a physical simulation device and method for inter-well gas channeling and sealing, the simulation results are slightly different from the actual working conditions, and the effects are intuitively displayed.

[0006] In order to achieve the above object, the present invention adopts the following technical solution: a physical simulation device for gas cross-flow and sealing between wells, comprising:

[0007] A gas reservoir kettle, wherein different simulated sealed formations are arranged inside the gas reservoir kettle, a plurality of formation outlets are arranged on the outer wall of the gas reservoir kettle corresponding to different simulated sealed formations, and a high-pressure gas inlet is arranged on the side wall of the gas reservoir kettle;

[0008] A high-pressure fluid booster pump, which is connected to the high-pressure gas inlet and pumps the high-pressure fluid into the simulated sealing formation;

[0009] A fluid reservoir, wherein the fluid reservoir is connected to a plurality of formation outlets respectively and records the gas volume of each formation outlet;

[0010] A production and injection system, the production and injection system comprising a gas injection tank, a sealing agent storage tank, an injection well, a production well and a pressure pump, the injection well and the production well are located in a simulated sealing formation, the injection well and the production well form a loop through a pipeline, and the gas injection tank, the sealing agent storage tank and the pressure pump are all connected to the loop;

[0011] The information collection system includes a monitoring well, a computer and a tracer tracker. The monitoring well is provided with a gas monitor for monitoring different simulated sealed formation gases. The tracer tracker is arranged inside the gas reservoir kettle. The tracer tracker collects the position information of the plugging agent and the tracer in the gas and obtains the migration map of the tracer through the computer. The computer is connected to the gas monitor by electrical signals.

[0012] The beneficial effects of the present invention are: through the coordination of the gas reservoir kettle body with the production and injection system and the information acquisition system, various well-to-well interference and plugging situations can be simulated, the functional effects are diverse, the simulated storage formation is close to the actual situation, and the well-to-well interference and plugging under high-pressure environment can be simulated; the tracer can identify the gas channel, and the tracer tracker can accurately display the migration of gas and plugging agent, and the effect is intuitive. According to the simulation results, corresponding measures can be taken to improve the gas storage speed, gas storage rate and development benefits.

[0013] Preferably, the gas reservoir kettle body includes a gas reservoir box, an upper flange, a lower flange and a heater, the top and bottom of the gas reservoir box are open, the upper flange and the lower flange are respectively sealed and connected to the top opening and the bottom opening of the gas reservoir box, the simulated sealed formation is located in the gas reservoir box, the formation outlet and the high-pressure gas inlet are respectively opened on the side wall of the gas reservoir box, and the upper flange is provided with a plurality of threaded holes connecting to injection wells, production wells and monitoring wells.

[0014] Preferably, the simulated sealing formation includes an overlying formation, a first formation, a second formation, a third formation, a fourth formation and a lower formation arranged in sequence from top to bottom, and the simulated sealing formation is manufactured using 3D printing technology. The high-pressure gas inlet is opened at the top of the first formation, and a plurality of different formation outlets respectively correspond to the first formation, the second formation, the third formation and the fourth formation to receive fluids from different formations; the plurality of different formation outlets are respectively connected to the fluid reservoir through a plurality of pipelines, and the plurality of pipelines are provided with one-way valves and flow meters.

[0015] Preferably, the injection well includes a first injection well and a second injection well, the production well includes a first production well and a second production well, the monitoring well includes a first monitoring well and a second monitoring well, and the tops 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 all provided with external threads matching the threaded holes;

[0016] The outer 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 formations (a first formation, a second formation, a third formation and a fourth formation); a first valve is provided on the well wall corresponding to the first perforation, a second valve is provided on the well wall corresponding to the second perforation, and a third valve is provided on the well wall corresponding to the third perforation; the outer wall of the second injection well is provided with a fourth perforation, a fifth perforation and a sixth perforation; the fourth perforation, the fifth perforation and the sixth perforation correspond to different formations, a fourth valve is provided on the well wall corresponding to the fourth perforation, a fifth valve is provided on the well wall corresponding to the fifth perforation, and a sixth valve is provided on the well wall corresponding to the sixth perforation.

[0017] Preferably, the tops of the first production well and the second production well are provided with discharge outlets for fluid outflow; the outer wall of the first production well is provided with a first production outlet, a second production outlet and a third production outlet; the first production outlet, the second production outlet and the third production outlet correspond to different formations, and a seventh valve is provided on the well wall corresponding to the first production outlet; an eighth valve is provided on the well wall corresponding to the second production outlet, and a ninth valve is provided on the well wall corresponding to the third production outlet; the outer wall of the second production well is provided with a fifth production outlet, a sixth production outlet and a seventh production outlet; the fifth production outlet, the sixth production outlet and the seventh production outlet respectively correspond to different formations, and a tenth valve is provided on the well wall corresponding to the fifth production outlet; an eleventh valve is provided on the well wall corresponding to the sixth production outlet, and a twelfth valve is provided on the well wall corresponding to the seventh production outlet.

[0018] Preferably, the first monitoring well is located in the overlying stratum, and a cement sealing plate for preventing fluid from passing through is provided inside the first monitoring well; a first monitoring port is provided on the side wall of the first monitoring well and below the cement sealing plate, and a first gas monitor is provided on the inner wall of the first monitoring well and close to the first monitoring port; the bottom end of the second monitoring well extends to the fourth stratum, and a second monitoring port, a third monitoring port, a fourth monitoring port and a fifth monitoring port are provided 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 provided on the inner wall of the second monitoring well corresponding to different monitoring ports; the second gas monitor is located in the first stratum, the third gas monitor is located in the second stratum, the fourth gas monitor is located in the third stratum, and the fifth gas monitor is located in the fourth stratum; the wellbore section between the second gas monitor, the third gas monitor, the fourth gas monitor and the fifth gas monitor is sealed with a cement sealing plate, and a sealing plate for preventing fluid from passing through is provided inside the second monitoring well and above the second gas monitor.

[0019] Preferably, the loop is connected with a control valve, a flow meter and a one-way valve, the loop is connected with a stirring pump, the gas injection tank and the sealing agent storage tank are respectively connected to the loop through branches, and the branch line is connected with a control valve.

[0020] The present invention also discloses a method for simulating gas cross-flow between wells and sealing the cross-flow, which comprises the following steps:

[0021] Step 1: Assembly and connection of simulation device: First, make different simulated sealing formations, assemble the gas reservoir kettle, connect the gas reservoir kettle, high-pressure fluid booster pump, fluid reservoir, production and injection system, and information acquisition system to form a simulation device, and then simulate different interference conditions in the multi-well production process;

[0022] Step 2: Simulate gas channeling during multi-well production. After stabilizing the loop pressure between the injection well and the production well, record the reading of the gas monitor. Change the valve status of the injection well and the production well at different depths to simulate the well interference process under different connectivity levels. Determine whether the gas monitor reading changes. Evaluate the gas channeling results of different injection and production methods based on the data changes.

[0023] Step 3: Simulate gas channeling under high temperature and high pressure during multi-well production. After the loop pressure between the injection well and the production well is stabilized, record the reading of the gas monitor. Turn on the high-pressure fluid booster pump to allow high-pressure gas to enter the gas reservoir kettle. Record the reading of the monitoring well to determine whether the reading has changed. Based on the data changes, determine whether weak formations between the separated formations have been broken, thereby evaluating the occurrence of inter-well gas channeling caused by the influx of high-pressure fluid after drilling into the high-pressure formation:

[0024] Step 4: Conduct simulation of plugging gas channeling after gas channeling occurs in the formation during multi-well production. According to Step 2, after gas channeling occurs, record the gas content Q in the fluid reservoir that enters different formations. Close the passage relationship between the fluid reservoir and different formations. Add plugging agent to the plugging agent reservoir, open the valve of the plugging agent reservoir, record the time t when each reading stabilizes, record the readings of the gas monitor and flowmeter, preset the preset gas volume Qb flowing into the fluid reservoir from different formations, then open the passage relationship between the fluid reservoir and different formations, record the actual gas volume Qa that enters the fluid reservoir from different formations, calculate the difference per unit time between the actual gas volume Qa and the gas content Q, |Qa - Q| / t, denoted as Wa, and calculate the difference per unit time between the preset gas volume Qb and the gas content Q, |Qb - Q| / t, denoted as Wb: If Wa < Wb, it indicates that the plugging effect of the plugging agent between the corresponding formations is good;

[0025] Step 5: The migration map of the tracer in the plugging agent can be obtained from the position of the tracer shown by the tracer tracker received by the information acquisition system, so as to better judge the plugging effect of the plugging agent.

[0026] Preferably, in Step 1, the simulated sealed formation is fabricated by 3D printing technology:

[0027] Step a: Detect the actual formation reservoir position through ultrasonic waves, determine the position and depth of different rock layers in the formation according to the particle size, and determine its distribution; obtain the position information of different rock layers in the formation through wireless data and conduct 3D modeling, and import the modeling subunit information into the laser positioning system and the spraying and printing system respectively;

[0028] Step b: According to the information of the modeling subunit, perform three-dimensional scaling on the formation and coarsen the modeling subunit by using the volume averaging method;

[0029] Step c: Split the 3D modeling model and export it to the laser positioning system;

[0030] Step d: The sandblasting system and mud spraying system in the spraying and printing system automatically control the sandblasting volume and mud spraying volume according to the size of the modeling subunit;

[0031] Step e: Conduct printing to finally fabricate and form.

[0032] Preferably, the simulation of gas channeling during multi-well production includes the following steps;

[0033] Step S1: opening the control valve, the one-way valve, the second valve, the third valve, the fourth valve, the fifth valve and the sixth valve on the pipeline between the gas injection tank and the injection well, so that the gas injection tank and the injection well are connected; the gas flows out of the gas injection tank, a part 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 the gas enters the second injection well, and enters different formations through the fourth perforation, the fifth perforation and the sixth perforation on the second injection well; continuing for 3 minutes;

[0034] Step S2: Open the control valve and the one-way valve on the production well loop; the gas will flow out of the gas reservoir kettle through the first production well and the second production well, and flow into the stirring pump along the pipeline; after being stirred by the stirring pump, the gas will enter the pressure pump through the stirring pump; the pressure pump pressurizes the gas and pumps it out, merges with the gas flowing out of the gas injection tank along the pipeline, and flows through the first injection well and the second injection well again along the pipeline into the gas reservoir kettle; stabilize the pressure until the reading of the flow meter remains unchanged, and continue for 2 minutes, record its reading as a, the reading of the second flow meter as b, and the reading of the third flow meter as c;

[0035] Step S3: The reading of the first gas monitor is recorded as A, the reading of the second gas monitor is recorded as B, the reading of the third gas monitor is C, the reading of the fourth gas monitor is D, and the reading of the fifth gas monitor is E;

[0036] Step S4: by changing the opening and closing states of valves at different depths on the first injection well, the second injection well, the first production well, and the second production well, the well interference process between wells under different degrees of connectivity is simulated;

[0037] Step S5: Record the indication of the first gas monitor as A1, record the indication of the second gas monitor as B1, record the indication of the third gas monitor as C1, record the indication of the fourth gas monitor as D1, and record the indication of the fifth gas monitor as E1; record the indication of the flow meter as a1, the indication of the second flow meter as b1, and the indication of the third flow meter as c1;

[0038] Step S6: Determine whether the indications of the first gas monitor, the second gas monitor, the third gas monitor, and the fourth gas monitor have changed, and evaluate the gas cross-talk results of different injection and production methods based on the data changes.

[0039] Preferably, the simulation of gas channeling under high temperature and high pressure during multi-well production includes the following steps:

[0040] Step s1: Open the control valve, the one-way valve, the second valve, the third valve, the fourth valve, the fifth valve, the sixth valve and the heater on the pipeline between the gas injection tank and the injection well, so that the gas injection tank and the injection well are connected; the gas flows out of the gas injection tank, and a part 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 the gas enters the second injection well, and enters different formations through the fourth perforation, the fifth perforation and the sixth perforation on the second injection well; continue for 3 minutes;

[0041] Step s2: open the control valve and the one-way valve on the production well loop; the gas will flow out of the gas reservoir kettle through the first production well and the second production well, and flow into the stirring pump along the pipeline; after being stirred by the stirring pump, the gas will enter the pressure pump through the stirring pump; the pressure pump pressurizes the gas and pumps it out, merges with the gas flowing out of the gas injection tank along the pipeline, and flows through the first injection well and the second injection well again along the pipeline into the gas reservoir kettle; stabilize the pressure until the flow meter reading remains unchanged, and continue for 2 minutes, record its reading as a, the reading of the second flow meter as b, and the reading of the third flow meter as c;

[0042] Step s3: The reading of the first gas monitor is recorded as A, the reading of the second gas monitor is recorded as B, the reading of the third gas monitor is C, the reading of the fourth gas monitor is D, and the reading of the fifth gas monitor is E;

[0043] Step s4: Open the control valve and the one-way valve on the high-pressure fluid booster pump and the supporting pipeline; the high-pressure fluid booster pump drives the high-pressure gas along the pipeline through the high-pressure gas inlet into the gas reservoir kettle;

[0044] Step s5: record the indication of the first gas monitor as A1, record the indication of the second gas monitor as B1, record the indication of the third gas monitor as C1, record the indication of the fourth gas monitor as D1, and record the indication of the fifth gas monitor as E1; record the indication of the flow meter as a1, the indication of the second flow meter as b1, and the indication of the third flow meter as c1;

[0045] Step s6: Determine whether the indications of the first gas monitor, the second gas monitor, the third gas monitor, and the fourth gas monitor have changed. Based on the data changes, determine whether weak formations between separated formations have been broken, thereby evaluating the occurrence of inter-well gas crossover caused by the influx of high-pressure fluid after drilling into the high-pressure formation.

[0046] Preferably, the sealing simulation after gas channeling occurs in the formation during the multi-well production process includes the following steps:

[0047] Step a1: after gas channeling occurs, the one-way valves between the fluid reservoir and the first, second, third and fourth formations are opened, and the gas content flowing into the fluid reservoir from the first formation is recorded as Q1, the gas content flowing into the fluid reservoir from the second formation is recorded as Q2, the gas content flowing into the fluid reservoir from the third formation is recorded as Q3, and the gas content flowing into the fluid reservoir from the fourth formation is recorded as Q4 in 3 minutes;

[0048] Step a2: closing the fluid reservoir and the one-way valves between the fluid reservoir and the first formation, the second formation, the third formation, and the fourth formation;

[0049] Step a3: adding sealing agent to the sealing agent storage tank, and opening the valve of the sealing agent storage tank;

[0050] Step a4: record the time for each indication to stabilize as t, and stabilize for 2 minutes; record the indication of the first gas monitor as A2, record the indication of the second gas monitor as B2, the indication of the third gas monitor as C1, the indication of the fourth gas monitor as D1, and the indication of the fifth gas monitor as E1; record the indication of the flow meter as a1, the indication of the second flow meter as b1, and the indication of the third flow meter as c1; set the preset gas volume flowing into the fluid reservoir from the first formation to Qb1; the preset gas volume flowing into the fluid reservoir from the second formation to Qb2, the preset gas volume flowing into the fluid reservoir from the third formation to Qb3, and the preset gas volume flowing into the fluid reservoir from the first formation to Qb4;

[0051] Step a5: opening the one-way valves between the first formation, the second formation, the third formation, the fourth formation and the fluid reservoir;

[0052] Step a6: record the gas content of the first formation flowing into the fluid reservoir within 3 minutes as Qa1, the gas content of the second formation flowing into the fluid reservoir as Qa2, the gas content of the third formation flowing into the fluid reservoir as Qa3, and the gas content of the fourth formation flowing into the fluid reservoir as Qa4;

[0053] Step a7: Calculate the size of |Qa1-Q1| / t and record it as Wa1; calculate the size of |Qa2-Q2| / t and record it as Wa2; calculate the size of |Qa3-Q3| / t and record it as Wa3; calculate the size of |Qa4-Q4| / t and record it as Wa4; calculate the size of |Qb1-Q1| / t and record it as Wb1; calculate the size of |Qb2-Q2| / t and record it as Wb2; calculate the size of |Qb3-Q3| / t and record it as Wb3; calculate the size of |Qb4-Q4| / t and record it as Wb4;

[0054] Step a8: Compare the magnitudes of Wa1 and Wb1, Wa2 and Wb2, Wa3 and Wb3, and Wa4 and Wb4; if Wa1 < Wb1, it indicates that the plugging agent has a good plugging effect between the first formation and the second formation, otherwise it indicates a poor effect. Similarly, the comparison results of Wa2 and Wb2, Wa3 and Wb3, and Wa4 and Wb4 can be explained.

[0055] The beneficial effects of the present invention are as follows: By using 3D printing technology to fabricate a simulated oil and gas reservoir model, the gas reservoir can be made closer to the actual operating conditions of a real gas reservoir, making the experimental results closer to the true values. Simulations and evaluations can be made for different inter-well interferences and channeling sealing, and the test results are true and accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] Figure 1 It is a schematic diagram of a physical simulation device for inter-well gas channeling and channeling sealing according to the present invention;

[0057] Figure 2 It is a cross-sectional view of a gas reservoir kettle body provided by an embodiment of the present invention;

[0058] Figure 3 It is a cross-sectional view of a first injection well and a second injection well provided by an embodiment of the present invention;

[0059] Figure 4 It is a cross-sectional view of a first production well and a second production well provided by an embodiment of the present invention;

[0060] Figure 5 It is a cross-sectional view of a first monitoring well and a second monitoring well provided by an embodiment of the present invention;

[0061] Figure 6 It is a cross-sectional view of the distribution positions of tracer trackers provided by an embodiment of the present invention.

[0062] 1-boosting pump; 2-flow meter; 3-stirring pump; 4-high-pressure fluid booster pump; 5-gas injection tank; 6-sealing agent storage tank; 7-gas reservoir kettle; 8-computer; 9-second production well; 10-first injection well; 11-first monitoring well; 12-second injection well; 13-second monitoring well; 14-second control valve; 15-third control valve; 16-sixth control valve; 17-fourth control valve; 18-first production well; 19-first single one-way valve; 20-third one-way valve; 21-high-pressure fluid control valve; 23-fluid reservoir; 24-high-pressure fluid one-way valve; 25-first control valve; 26-valve of sealing agent reservoir; 27-second flowmeter; 28-third flowmeter; 29-first formation one-way valve; 30-second formation one-way valve; 31-third formation one-way valve; 32-fourth formation one-way valve; 33-tracer tracker; A01-first perforation; A02-first valve; A03-second perforation; A04-second valve; A05-third perforation; A06-third valve; B01-fourth perforation; B02-fourth valve; B03-fifth perforation; B04-fifth valve; B05-sixth perforation; B06-sixth valve; C01-first production port; C02-seventh valve; C03 second production port; C04-eighth valve; C05-third production port; C06-ninth valve; D01-fifth production port; D02-tenth valve; D03 sixth production port; D04-eleventh valve; D05-seventh production port; D06-twelfth valve; E01-first gas monitor; E02-second monitoring port; F01-second monitoring port; F02-second gas monitor; F03-third monitoring port; F04-third gas monitor; F05-fourth monitoring port; F07-fifth gas monitor; F06 fifth monitoring port. DETAILED DESCRIPTION

[0063] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0064] See the attached Figures 1 to 6 , conveyed to those skilled in the art according to the embodiments of the present invention.

[0065] like Figure 1-2 As shown, the simulation device for evaluating inter-well gas channeling and sealing provided by the present invention comprises a depleted gas reservoir simulation system, an injection system and an information acquisition system;

[0066] Reference Figure 2As shown, the gas reservoir kettle body 7 includes a gas reservoir box 117, an upper flange 101, a lower flange 110, simulated sealed formations (overlying formation 103, first formation 104, second formation 105, third formation 106, fourth formation 107 and lower formation 111), an upper flange sealing gasket 108, a lower flange sealing 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 box 117 is connected to the upper flange 101 by bolts and sealed by the upper flange sealing gasket 108, and the lower end of the gas reservoir box 117 is connected to the lower flange 110 by bolts and sealed by the lower flange sealing gasket 109; the high-pressure gas inlet 116 Located at the side end of the gas reservoir box 117, high-pressure fluid enters the simulated sealed formation 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 box 117, and the gas of different formations (the first formation, the second formation, the third formation, and the fourth formation) in the gas reservoir box 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 gas volume 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 sealed formation is placed in the gas reservoir kettle 7;

[0067] Reference Figure 1 As shown, the production and injection system includes a gas injection tank 5, a sealing agent storage 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 pressure pump 1, a flow meter 2 and a fluid reservoir 23;

[0068] The information collection system includes a first monitoring well 11, a second monitoring well 13, a computer 8, an information collector, and a tracer tracking device 33;

[0069] The simulated storage strata are made using 3D printing technology, and different materials are used to print each stratum area according to the actual stratum conditions;

[0070] The inner surface of the gas reservoir kettle is evenly distributed with tracer trackers 33, which can track the position of the tracer in the plugging agent and present the plugging status of the plugging agent through a computer;

[0071] The first injection well 10, the second injection well 12, the first production well 18, the second production well 9, the first monitoring well 11 and the second monitoring well 13 are provided with external thread sections at their upper ends, which can cooperate with the internal thread sections provided on the upper flange 101;

[0072] The ends of the first injection well 10 and the second injection well 12 are provided with inlets for connecting fluid equipment; 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 provided on the well wall corresponding to the first perforation A01, a second valve A04 is provided on the well wall corresponding to the second perforation A03, and a third valve A06 is provided 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 provided on the well wall corresponding to the fourth perforation B01, a fifth valve B04 is provided on the well wall corresponding to the fifth perforation B03, and a sixth valve B06 is provided on the well wall corresponding to the sixth perforation B05;

[0073] The first production well 18 and the second production well 9 are provided with outlets for fluid to flow out at the ends; the first production well 18 is provided with a first production outlet C01, a second production outlet C03 and a third production outlet C05 on the side wall; a seventh valve C02 is provided on the well wall corresponding to the first production outlet C01; an eighth valve C04 is provided on the well wall corresponding to the second production outlet C03, and a ninth valve C06 is provided on the well wall corresponding to the third production outlet C05; a fifth production outlet D01, a sixth production outlet D03 and a seventh production outlet D05 are provided on the side end of the second production well 9; a tenth valve D02 is provided on the well wall corresponding to the fifth production outlet D01; an eleventh valve D04 is provided on the well wall corresponding to the sixth production outlet D03, and a twelfth valve D06 is provided on the well wall corresponding to the seventh production outlet D05;

[0074] The middle parts of the first monitoring well 11 and the second monitoring well 13 are sealed with cement, and fluid cannot enter the first monitoring well 11 and the second monitoring well 13; the first monitoring well 11 is located at the depth of the overlying formation 103, and the side end of the first monitoring well 11 is provided with a first gas monitor E01, and the first gas monitor E01 is located at the lower end of the sealing; the second monitoring well 13 is located at the depth of the fourth formation 107, and the side wall of the second monitoring well 13 is provided with a second gas monitor F02, a third gas monitor F04 and a fourth gas monitor F06; 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; the wellbore section between the second gas monitor F02, the third gas monitor F04, the fourth gas monitor F06 and the fifth monitoring F07 is sealed with a cement ring, and fluid cannot pass through;

[0075] The preparation of simulated storage formation mainly includes the following steps:

[0076] Step 1: Use ultrasonic waves to detect the actual reservoir position, determine the position and depth of different rock layers in the formation according to the particle size, and determine their distribution status; obtain the position information of different rock layers in the formation through wireless data and perform 3D modeling, and import the modeling sub-unit information into the laser positioning system and spray printing system respectively;

[0077] Step 2: According to the information of the modeling subunit, the stratum is scaled in three dimensions, and the modeling subunit is coarsened using the volume averaging method;

[0078] Step 3: Segment the 3D model and export it to the laser positioning system;

[0079] Step 4: The sandblasting system and mudblasting system in the spray printing system automatically control the sandblasting amount and mudblasting amount according to the size of the modeling subunit;

[0080] Step 5: Print;

[0081] The simulation of gas channeling includes the following steps:

[0082] Step 1: Open 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. The gas flows out of the gas injection tank 5, passes through the first control valve 25 and the first check valve 19 along the pipeline (conduit), and 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; last for 3 minutes;

[0083] Step 2: Open the second one-way valve 28, the third one-way valve 20, the fourth control valve 17 and the sixth control valve 16; the gas will flow out of the gas reservoir kettle 7 through the first production well 18 and the second production well 9, and flow into the stirring pump 3 through the second one-way valve 28 along the conduit; after being stirred by the stirring pump 3, the gas will enter the pressure pump 1 through the stirring pump 3; the pressure pump 1 pressurizes the gas and pumps it out, and after flowing through the third one-way valve 20 along the conduit, it 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 conduit again to enter the gas reservoir kettle 7; stabilize the pressure until the reading of the flow meter 2 remains unchanged, and continue for 2 minutes, and record its reading as a; record the reading of the second flow meter 27 as b; record the reading of the third flow meter 28 as c;

[0084] Step 3: The reading of the first gas monitor E01 is recorded as A, the reading of the second gas monitor F02 is recorded as B, the reading of the third gas monitor F04 is C, the reading of the fourth gas monitor F06 is D, and the reading of the fifth gas monitor F07 is E;

[0085] Step 4: By changing the opening and closing states of valves at different depths on the first injection well 10, the second injection well 12, the first production well 18, and the second production well 9, the well interference process under different connectivity levels is simulated;

[0086] Step 5: Record the indication of the first gas monitor E01 as A1, record the indication of the second gas monitor F02 as B1, record the indication of the third gas monitor F04 as C1, record the indication of the fourth gas monitor F06 as D1, and record the indication of the fifth gas monitor F07 as E1; record the indication of the flow meter 2 as a1, the indication of the second flow meter 31 as b1, and the indication of the third flow meter 32 as c1;

[0087] Step 6: Determine whether the indications of the first gas monitor E01, the second gas monitor F02, the third gas monitor F04, and the fourth gas monitor F06 have changed, and evaluate the gas channeling results of different injection and production methods according to the data changes;

[0088] For gas channeling simulation under high temperature and high pressure, the following steps are included:

[0089] Step 1: Open 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. The gas flows out of the gas injection tank 5, passes through the first control valve 25 and the first check valve 19 along the conduit, and 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; last for 3 minutes;

[0090] Step 2: Open the second one-way valve 28, the third one-way valve 20, the fourth control valve 17 and the sixth control valve 16; the gas will flow out of the gas reservoir kettle 7 through the first production well 18 and the second production well 9, and flow into the stirring pump 3 through the second one-way valve 28 along the conduit; after being stirred by the stirring pump 3, the gas will enter the pressure pump 1 through the stirring pump 3; the pressure pump 1 pressurizes the gas and pumps it out, and after flowing through the third one-way valve 20 along the conduit, it 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 conduit again to enter the gas reservoir kettle 7; stabilize the pressure until the reading of the flow meter 2 remains unchanged, and continue for 2 minutes, and record its reading as a; record the reading of the second flow meter 27 as b; record the reading of the third flow meter 28 as c;

[0091] Step 3: The reading of the first gas monitor E01 is recorded as A, the reading of the second gas monitor F02 is recorded as B, the reading of the third gas monitor F04 is C, the reading of the fourth gas monitor F06 is D, and the reading of the fifth gas monitor F07 is E;

[0092] Step 4: Open the high-pressure fluid control valve 21, the high-pressure fluid check valve 24 and the high-pressure fluid booster pump 4; the high-pressure fluid booster pump 4 drives the high-pressure gas along the conduit through the high-pressure fluid control valve 21, the high-pressure fluid check valve 24 and the high-pressure gas inlet 116 into the gas reservoir kettle 7;

[0093] Step 5: Record the indication of the first gas monitor E01 as A1, record the indication of the second gas monitor F02 as B1, record the indication of the third gas monitor F04 as C1, record the indication of the fourth gas monitor F06 as D1, and record the indication of the fifth gas monitor F07 as E1; record the indication of the flow meter 2 as a1, the indication of the second flow meter 27 as b1, and the indication of the third flow meter 28 as c1;

[0094] Step 6: Determine whether the indications of the first gas monitor E01, the second gas monitor F02, the third gas monitor F04, and the fourth gas monitor F06 have changed, and determine whether weak formations have been broken between the separated formations based on the data changes, so as to evaluate the occurrence of gas crossover between wells caused by the influx of high-pressure fluid after drilling into the high-pressure formation;

[0095] The sealing simulation after gas channeling occurs in the formation includes the following steps:

[0096] Step 1: After gas channeling occurs, open 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; record the gas content flowing into the fluid reservoir 23 through the first formation check valve 29 within 3 minutes as Q1, the gas content flowing into the fluid reservoir 23 through the second formation check valve 30 as Q2, the gas content flowing into the fluid reservoir 23 through the third formation check valve 31 as Q3, and the gas content flowing into the fluid reservoir 23 through the fourth formation check valve 32 as Q4;

[0097] Step 2: Close 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;

[0098] Step 3: Add sealing agent to the sealing agent storage tank 6, and open the sealing agent storage tank valve 26;

[0099] Step 4: record the time for each indication to stabilize as t, and stabilize for 2 minutes; record the indication of the first gas monitor E01 as A2, record the indication of the second gas monitor F02 as B2, the indication of the third gas monitor F04 as C1, the indication of the fourth gas monitor F06 as D1, and the indication of the fifth gas monitor F07 as E1; record the indication of the flow meter 2 as a1, the indication of the second flow meter 27 as b1, and the indication of the third flow meter 28 as c1; set the preset gas volume flowing into the fluid reservoir from the first formation to Qb1; the preset gas volume flowing into the fluid reservoir from the second formation to Qb2, the preset gas volume flowing into the fluid reservoir from the third formation to Qb3, and the preset gas volume flowing into the fluid reservoir from the first formation to Qb4;

[0100] Step 4: Open 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;

[0101] Step 5: Record the gas content flowing into the fluid reservoir 23 through the first formation check valve 29 within 3 minutes as Qa1, the gas content flowing into the fluid reservoir 23 through the second formation check valve 30 as Qa2, the gas content flowing into the fluid reservoir 23 through the third formation check valve 31 as Qa3, and the gas content flowing into the fluid reservoir 23 through the fourth formation check valve 32 as Qa4;

[0102] Step 6: Calculate the magnitude of |Qa1 - Q1| / t and record it as Wa1; calculate the magnitude of |Qa2 - Q2| / t and record it as Wa2; calculate the magnitude of |Qa3 - Q3| / t and record it as Wa3; calculate the magnitude of |Qa4 - Q4| / t and record it as Wa4; calculate the magnitude of |Qb1 - Q1| / t and record it as Wb1; calculate the magnitude of |Qb2 - Q2| / t and record it as Wb2; calculate the magnitude of |Qb3 - Q3| / t and record it as Wb3; calculate the magnitude of |Qb4 - Q4| / t and record it as Wb4;

[0103] Step 7: Compare the magnitudes of Wa1 and Wb1, Wa2 and Wb2, Wa3 and Wb3, Wa4 and Wb4. If Wa1 < Wb1, it indicates that the plugging effect of the plugging agent between the first formation and the second formation is good; otherwise, it indicates that the effect is not good. Similarly, the comparison results of Wa2 and Wb2, Wa3 and Wb3, and Wa4 and Wb4 can be explained.

[0104] Step 8: According to the position of the tracer in the plugging agent shown by the tracer tracker 33 received by the information acquisition system 15, a migration map of the tracer can be obtained, so as to better judge the plugging effect of the plugging agent.

[0105] In the present invention, the injection-production system is used to inject formation fluids and produce formation fluids. The information acquisition system includes a gas monitor, a computer, and an information collector, which can make a pressure feedback on the well interference under different connectivity degrees; the fluids and plugging agents used contain tracers, and the tracer tracker can display the migration of the tracers, so as to identify the gas channeling path, display the migration trajectory of the plugging agent, which is of great significance for the gas storage in the gas reservoir.

[0106] For the devices and usage methods disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple. For related parts, reference can be made to the description in the method part.

[0107] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A physical simulation device for inter-well gas channeling and sealing. It is characterized in that include: A gas reservoir kettle, wherein different simulated sealed formations are arranged inside the gas reservoir kettle, a plurality of formation outlets are arranged on the outer wall of the gas reservoir kettle corresponding to different simulated sealed formations, and a high-pressure gas inlet is arranged on the side wall of the gas reservoir kettle; A high-pressure fluid booster pump, which is connected to the high-pressure gas inlet and pumps the high-pressure fluid into the simulated sealing formation; A fluid reservoir, wherein the fluid reservoir is connected to a plurality of formation outlets respectively and records the gas volume of each formation outlet; A production and injection system, the production and injection system comprising a gas injection tank, a sealing agent storage tank, an injection well, a production well and a pressure pump, the injection well and the production well are located in a simulated sealing formation, the injection well and the production well form a loop through a pipeline, and the gas injection tank, the sealing agent storage tank and the pressure pump are all connected to the loop; An information collection system, the information collection system comprising a monitoring well, a computer and a tracer tracker, the monitoring well is provided with a gas monitor for monitoring different simulated sealed formation gases, the tracer tracker is arranged inside the gas reservoir kettle, the tracer tracker collects the position information of the plugging agent and the tracer in the gas and obtains the migration map of the tracer through the computer, and the computer is connected to the gas monitor by electrical signals; The gas reservoir kettle body comprises a gas reservoir box, an upper flange, a lower flange and a heater, the top and bottom of the gas reservoir box are open, the upper flange and the lower flange are respectively sealed and connected to the top opening and the bottom opening of the gas reservoir box, the simulated sealed formation is located in the gas reservoir box, the formation outlet and the high-pressure gas inlet are respectively opened on the side wall of the gas reservoir box, and the upper flange is provided with a plurality of threaded holes connected to injection wells, production wells and monitoring wells; the simulated sealed formation comprises an overlying formation, a first formation, a second formation, a third formation, a fourth formation and a lower formation arranged in sequence from top to bottom, the simulated sealed formation is manufactured by using 3D printing technology, the high-pressure gas inlet is correspondingly opened at the top of the first formation, and a plurality of different formation outlets respectively correspond to the first formation, the second formation, the third formation and the fourth formation to receive fluids from different formations; The injection well includes a first injection well and a second injection well, the production well includes a first production well and a second production well, and the monitoring well includes a first monitoring well and a second monitoring well. The tops 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 all provided with external threads matching the threaded holes; The outer 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 formations; The tops of the first production well and the second production well are provided with outlets for fluid to flow out; the outer wall of the first production well is provided with a first production outlet, a second production outlet and a third production outlet; the first production outlet, the second production outlet and the third production outlet correspond to different formations.

2. A physical simulation device for inter-well gas cross-flow and sealing according to claim 1, It is characterized in that Multiple different formation outlets are connected to the fluid reservoir through multiple pipelines, and each pipeline is provided with a one-way valve and a flow meter for recording the amount of fluid flowing out of different formations.

3. A physical simulation device for inter-well gas cross-flow and sealing according to claim 2, It is characterized in that A first valve is provided on the well wall corresponding to the first perforation, a second valve is provided on the well wall corresponding to the second perforation, and a third valve is provided on the well wall corresponding to the third perforation; a fourth perforation, a fifth perforation and a sixth perforation are provided on the outer wall of the second injection well; the fourth perforation, the fifth perforation and the sixth perforation correspond to different formations, a fourth valve is provided on the well wall corresponding to the fourth perforation, a fifth valve is provided on the well wall corresponding to the fifth perforation, and a sixth valve is provided on the well wall corresponding to the sixth perforation.

4. A physical simulation device for inter-well gas cross-flow and sealing according to claim 3, It is characterized in that A seventh valve is provided on the well wall corresponding to the first production outlet; an eighth valve is provided on the well wall corresponding to the second production outlet, and a ninth valve is provided on the well wall corresponding to the third production outlet; a fifth production outlet, a sixth production outlet and a seventh production outlet are provided on the outer wall of the second production well; the fifth production outlet, the sixth production outlet and the seventh production outlet correspond to different formations respectively, and a tenth valve is provided on the well wall corresponding to the fifth production outlet; an eleventh valve is provided on the well wall corresponding to the sixth production outlet, and a twelfth valve is provided on the well wall corresponding to the seventh production outlet.

5. A physical simulation device for inter-well gas cross-flow and sealing according to claim 4, It is characterized in that The first monitoring well is located in the overlying stratum, and a cement sealing plate for preventing fluid from passing through is provided inside the first monitoring well; a first monitoring port is provided on the side wall of the first monitoring well and below the cement sealing plate, and a first gas monitor is provided on the inner wall of the first monitoring well and near the first monitoring port; the bottom end of the second monitoring well extends to the fourth stratum, and a second monitoring port, a third monitoring port, a fourth monitoring port and a fifth monitoring port are provided 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 provided on the inner wall of the second monitoring well corresponding to different monitoring ports; the second gas monitor is located in the first stratum, the third gas monitor is located in the second stratum, the fourth gas monitor is located in the third stratum, and the fifth gas monitor is located in the fourth stratum; the wellbore section between the second gas monitor, the third gas monitor, the fourth gas monitor and the fifth gas monitor is sealed with a cement sealing plate, and a sealing plate for preventing fluid from passing through is provided inside the second monitoring well and above the second gas monitor.

6. A physical simulation device for inter-well gas cross-flow and sealing according to claim 5, It is characterized in that The loop is connected with a control valve, a flow meter and a one-way valve, the loop is connected with a stirring pump, the gas injection tank and the sealing agent storage tank are respectively connected with the loop through branch lines, and the branch lines are connected with a control valve.

7. A method for simulating gas cross-contamination and sealing between wells using the simulation device according to claim 6, It is characterized in that The following steps are involved: Step 1: Assembly and connection of the simulation device: First, fabricate different simulated sealed formations, assemble the gas reservoir kettle body, establish the connection relationship among the gas reservoir kettle body, high-pressure fluid pressurizing pump, fluid reservoir, injection-production system, and information acquisition system to form the simulation device, and then simulate different interference situations during the multi-well production process; Step 2: Simulation of gas channeling during the multi-well production process. After stabilizing the pressure in the loop between the injection well and the production well, record the readings of the gas monitor. Change the valve states at different depths of the injection well and the production well to simulate the inter-well interference process under different connection degrees, and judge whether the readings of the gas monitor change: According to the data changes, evaluate the gas channeling results of different injection-production methods; Step 3: Simulation of gas channeling under high temperature and high pressure during the multi-well production process. After stabilizing the pressure in the loop between the injection well and the production well, record the readings of the gas monitor. Open the high-pressure fluid pressurizing pump to allow high-pressure gas to enter the gas reservoir kettle body, record the readings of the monitoring well, and judge whether the readings change. According to the data changes, judge whether there is a phenomenon of weak formation rupture between the separated formations, so as to evaluate the occurrence of inter-well gas channeling caused by the influx of high-pressure fluid after drilling into the high-pressure formation: Step 4: Simulation of plugging gas channeling after gas channeling occurs in the formation during the multi-well production process. According to Step 2, after gas channeling occurs, record the gas content Q in the fluid reservoir entering different formations. Close the passage relationship between the fluid reservoir and different formations, add plugging agent to the plugging agent reservoir tank, open the valve of the plugging agent reservoir tank, record the time t when each reading stabilizes, record the readings of the gas monitor and the flowmeter, preset the preset gas volume Qb flowing into the fluid reservoir from different formations, then open the passage relationship between the fluid reservoir and different formations, record the actual gas volume Qa entering the fluid reservoir from different formations, and calculate the difference per unit time between the actual gas volume Qa and the gas content Q, |Qa - Q| / t, denoted as Wa. Calculate the difference per unit time between the preset gas volume Qb and the gas content Q, |Qb - Q| / t, denoted as Wb: If Wa < Wb, it indicates that the plugging effect of the plugging agent between the corresponding formations is good; Step 5: The migration map of the tracer in the plugging agent can be obtained from the position of the tracer shown by the tracer tracker received by the information acquisition system, so as to better judge the plugging effect of the plugging agent.

8. A method for simulating inter-well gas channeling and plugging gas channeling according to claim 7, characterized in that, the simulation of gas channeling during the multi-well production process specifically includes the following steps; Step S1: Open the control valve, check valve, second valve, third valve, fourth valve, fifth valve, and sixth valve on the pipeline between the gas injection tank and the injection well to make the gas injection tank communicate with the injection well; gas flows out of the gas injection tank, and along the pipeline, part of the gas enters the first injection well and enters different formations through the first perforation, second perforation, and third perforation on the first injection well; part of the gas enters the second injection well and enters different formations through the fourth perforation, fifth perforation, and sixth perforation on the second injection well; last for 3 min; Step S2: Open the control valve and the one-way valve on the production well loop; the gas will flow out of the gas reservoir kettle through the first production well and the second production well, and flow into the stirring pump along the pipeline; after being stirred by the stirring pump, the gas will enter the pressure pump through the stirring pump; the pressure pump pressurizes the gas and pumps it out, merges with the gas flowing out of the gas injection tank along the pipeline, and flows through the first injection well and the second injection well again along the pipeline into the gas reservoir kettle; stabilize the pressure until the reading of the flow meter remains unchanged, and continue for 2 minutes, record its reading as a, the reading of the second flow meter as b, and the reading of the third flow meter as c; Step S3: The reading of the first gas monitor is recorded as A, the reading of the second gas monitor is recorded as B, the reading of the third gas monitor is C, the reading of the fourth gas monitor is D, and the reading of the fifth gas monitor is E; Step S4: by changing the opening and closing states of valves at different depths on the first injection well, the second injection well, the first production well, and the second production well, the well interference process between wells under different degrees of connectivity is simulated; Step S5: Record the indication of the first gas monitor as A1, record the indication of the second gas monitor as B1, record the indication of the third gas monitor as C1, record the indication of the fourth gas monitor as D1, and record the indication of the fifth gas monitor as E1; record the indication of the flow meter as a1, the indication of the second flow meter as b1, and the indication of the third flow meter as c1; Step S6: Determine whether the indications of the first gas monitor, the second gas monitor, the third gas monitor, and the fourth gas monitor have changed, and evaluate the gas cross-talk results of different injection and production methods based on the data changes.

9. A method for simulating gas cross-flow and sealing between wells according to claim 7, It is characterized in that The simulation of gas channeling under high temperature and high pressure during multi-well production includes the following steps: Step s1: Open the control valve, the one-way valve, the second valve, the third valve, the fourth valve, the fifth valve, the sixth valve and the heater on the pipeline between the gas injection tank and the injection well, so that the gas injection tank and the injection well are connected; the gas flows out of the gas injection tank, and a part 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 the gas enters the second injection well, and enters different formations through the fourth perforation, the fifth perforation and the sixth perforation on the second injection well; continue for 3 minutes; Step s2: open the control valve and the one-way valve on the production well loop; the gas will flow out of the gas reservoir kettle through the first production well and the second production well, and flow into the stirring pump along the pipeline; after being stirred by the stirring pump, the gas will enter the pressure pump through the stirring pump; the pressure pump pressurizes the gas and pumps it out, merges with the gas flowing out of the gas injection tank along the pipeline, and flows through the first injection well and the second injection well again along the pipeline into the gas reservoir kettle; stabilize the pressure until the reading of the flow meter remains unchanged, and continue for 2 minutes, record its reading as a, the reading of the second flow meter as b, and the reading of the third flow meter as c; Step s3: The reading of the first gas monitor is recorded as A, the reading of the second gas monitor is recorded as B, the reading of the third gas monitor is C, the reading of the fourth gas monitor is D, and the reading of the fifth gas monitor is E; Step s4: Open the control valve and the one-way valve on the high-pressure fluid booster pump and the supporting pipeline; the high-pressure fluid booster pump drives the high-pressure gas along the pipeline through the high-pressure gas inlet into the gas reservoir kettle; Step s5: record the indication of the first gas monitor as A1, record the indication of the second gas monitor as B1, record the indication of the third gas monitor as C1, record the indication of the fourth gas monitor as D1, and record the indication of the fifth gas monitor as E1; record the indication of the flow meter as a1, the indication of the second flow meter as b1, and the indication of the third flow meter as c1; Step s6: Determine whether the indications of the first gas monitor, the second gas monitor, the third gas monitor, and the fourth gas monitor have changed. Based on the data changes, determine whether weak formations between separated formations have been broken, thereby evaluating the occurrence of inter-well gas crossover caused by the influx of high-pressure fluid after drilling into the high-pressure formation.

10. A method for simulating gas cross-flow and sealing between wells according to claim 7, It is characterized in that The simulation of sealing gas channeling after gas channeling occurs in the formation during multi-well production includes the following steps: Step a1: after gas channeling occurs, the one-way valves between the fluid reservoir and the first, second, third and fourth formations are opened, and the gas content flowing into the fluid reservoir from the first formation is recorded as Q1, the gas content flowing into the fluid reservoir from the second formation is recorded as Q2, the gas content flowing into the fluid reservoir from the third formation is recorded as Q3, and the gas content flowing into the fluid reservoir from the fourth formation is recorded as Q4 in 3 minutes; Step a2: closing the fluid reservoir and the one-way valves between the fluid reservoir and the first formation, the second formation, the third formation, and the fourth formation; Step a3: adding sealing agent to the sealing agent storage tank, and opening the valve of the sealing agent storage tank; Step a4: record the time for each indication to stabilize as t, and stabilize for 2 minutes; record the indication of the first gas monitor as A2, record the indication of the second gas monitor as B2, the indication of the third gas monitor as C1, the indication of the fourth gas monitor as D1, and the indication of the fifth gas monitor as E1; record the indication of the flow meter as a1, the indication of the second flow meter as b1, and the indication of the third flow meter as c1; set the preset gas volume flowing into the fluid reservoir from the first formation to Qb1; the preset gas volume flowing into the fluid reservoir from the second formation to Qb2, the preset gas volume flowing into the fluid reservoir from the third formation to Qb3, and the preset gas volume flowing into the fluid reservoir from the first formation to Qb4; Step a5: opening the one-way valves between the first formation, the second formation, the third formation, the fourth formation and the fluid reservoir; Step a6: record the gas content of the first formation flowing into the fluid reservoir within 3 minutes as Qa1, the gas content of the second formation flowing into the fluid reservoir as Qa2, the gas content of the third formation flowing into the fluid reservoir as Qa3, and the gas content of the fourth formation flowing into the fluid reservoir as Qa4; Step a7: Calculate the magnitude of |Qa1 - Q1| / t and record it as Wa1; calculate the magnitude of |Qa2 - Q2| / t and record it as Wa2; calculate the magnitude of |Qa3 - Q3| / t and record it as Wa3; calculate the magnitude of |Qa4 - Q4| / t and record it as Wa4; calculate the magnitude of |Qb1 - Q1| / t and record it as Wb1; calculate the magnitude of |Qb2 - Q2| / t and record it as Wb2; calculate the magnitude of |Qb3 - Q3| / t and record it as Wb3; calculate the magnitude of |Qb4 - Q4| / t and record it as Wb4; Step a8: Compare the magnitudes of Wa1 and Wb1, Wa2 and Wb2, Wa3 and Wb3, Wa4 and Wb4; if Wa1 < Wb1, it indicates that the plugging agent has a good plugging effect between the first formation and the second formation, otherwise it indicates a poor effect. Similarly, the comparison results of Wa2 and Wb2, Wa3 and Wb3, and Wa4 and Wb4 can be explained.

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