Heterogeneous gas reservoir water invasion channel reservoir type judgment method

Abstract

The invention belongs to the field of oil and gas field development, and particularly relates to a heterogeneous gas reservoir water invasion channel reservoir type judgment method. According to the core water invasion saturation SN of each reservoir section of the gas reservoir section, the reservoir type of the water invasion channel is judged and obtained; wherein N belongs to (1, 2,..., n), and n represents the number of reservoir sections. According to the method, the reservoir type of the gas reservoir water invasion channel can be judged through the water invasion saturation, the method has the advantage of being high in judgment precision, and an effective basis is provided for water prevention and control.

Description

Technical Field

[0001] The invention belongs to the field of oil and gas field development, and in particular relates to a method for determining the reservoir type of a water invasion channel in a heterogeneous gas reservoir. Background Art

[0002] About 50% of the developed gas reservoirs in my country have active edge water and bottom water. In the middle and late stages of gas reservoir development, the pressure of the gas reservoir drops, causing water to enter the gas wells along different channels, resulting in serious water production in the gas wells, a significant drop in gas well productivity, and most of the gas reservoir reserves cannot be effectively used.

[0003] In order to increase gas well production, it is very necessary to waterproof and control water in gas reservoirs. To achieve waterproof and control water, the first step is to determine the source of water intrusion and the reservoir type of the main water intrusion channel.

[0004] However, there are many different types of reservoirs in heterogeneous gas reservoirs. The existing judgment methods for judging the main water invasion channel reservoir types in heterogeneous gas reservoirs have poor accuracy, resulting in poor waterproofing and water control effects. Therefore, it is necessary to provide a method for judging the water invasion channel reservoir type in heterogeneous gas reservoirs.

[0005] In view of this, the present invention is proposed. Summary of the invention

[0006] In order to solve the technical problems in the prior art, the present invention provides a method for judging the reservoir type of water invasion channel in a heterogeneous gas reservoir. The method of the present invention can realize the judgment of the reservoir type of water invasion channel in a gas reservoir by monitoring the change of water invasion saturation through nuclear magnetic resonance T2 spectrum, and has the advantage of high judgment accuracy, providing an effective basis for water prevention and control.

[0007] The present invention includes the following technical solutions:

[0008] The present invention provides a method for determining the reservoir type of a water invasion channel in a heterogeneous gas reservoir, according to the core water invasion saturation S of each reservoir section of the gas reservoir. N Determine the reservoir type of water invasion channel;

[0009] Where: N∈(1,2,...,n), n represents the number of reservoir segments.

[0010] Furthermore, according to the core water invasion saturation S of each reservoir section in the gas reservoir section N The water invasion channel reservoir type can be determined by judging the core type.

[0011] Further, the following steps are included:

[0012] Obtain cores from various reservoir sections of the gas reservoir;

[0013] Obtaining the NMR T2 spectrum of the core without water Obtaining the NMR T2 spectrum when the core is fully saturated

[0014] A water invasion simulation experiment was conducted on a core with the same water saturation as that of each reservoir segment. After the experiment, the nuclear magnetic resonance T2 spectrum of the core was obtained.

[0015] By NMR T2 spectroscopy NMR T2 spectroscopy and NMR T2 spectroscopy Get water saturation S N ;

[0016] in: represents the NMR T2 spectrum T of the nth reservoir A ; represents the NMR T2 spectrum T of the nth reservoir B ; represents the NMR T2 spectrum T of the nth reservoir C .

[0017] Further, the following steps are included:

[0018] S100: obtaining cores of each reservoir section of the gas reservoir;

[0019] S200: Deoil, desalt and dry the core to obtain the nuclear magnetic resonance T2 spectrum of the dried core without water

[0020] S300: vacuuming and pressurizing the core dried in step S200 to saturate it with simulated formation water to obtain a nuclear magnetic resonance T2 spectrum when the core is fully saturated

[0021] S400: centrifugally remove water from the fully saturated core in step S300 to obtain a core having a water saturation equal to that of its reservoir section, and conduct a water invasion simulation experiment on the core to obtain a nuclear magnetic resonance T2 spectrum of the core after water invasion

[0022] S500: by NMR T2 spectroscopy NMR T2 spectroscopy and NMR T2 spectroscopy Get water saturation S N .

[0023] Furthermore, the water saturation

[0024]

[0025] Where: t NAQ ∈(t NA1 ,t NA2 ,...,t NAq ), t NAq Represents NMR T2 spectrum The ordinate of the qth point on the t NBQ ∈(t NB1 ,t NB2 ,...,t NBq ), t NBq Represents NMR T2 spectrum The ordinate of the qth point on the t NCQ ∈(t NC1 ,t NC2 ,...,t NCq ), t NCq Represents NMR T2 spectrum The ordinate of the qth point on the graph.

[0026] Furthermore, the experimental device used in the water invasion simulation experiment includes a constant temperature box and an experimental mechanism, wherein the experimental mechanism is arranged in the constant temperature box, and the experimental mechanism includes a first intermediate container, a second intermediate container, a first booster pump, a second booster pump, a third booster pump, a plurality of core holders, a plurality of back pressure valves, a first six-way valve, and a second six-way valve;

[0027] The first booster pump is connected to the first intermediate container and the second intermediate container respectively through the first six-way valve, the first intermediate container and the second intermediate container are connected to the plurality of core holders through the second six-way valve, and each core holder is connected to a back pressure valve respectively;

[0028] The second booster pumps are respectively connected to a plurality of core holders;

[0029] The third boost pump is connected to a plurality of back-pressure valves respectively.

[0030] Furthermore, the first intermediate container is filled with nitrogen, and the second intermediate container is filled with formation water. The water invasion simulation experiment is performed by the experimental device, including the following steps:

[0031] Place a core into a core holder;

[0032] Open the thermostat;

[0033] Turn on the third booster pump to keep the multiple back-pressure valves closed;

[0034] Turn on the second booster pump to apply confining pressure to the multiple core holders;

[0035] Controlling the first six-way valve to connect the first booster pump with the first intermediate container and the second intermediate container;

[0036] Controlling the second six-way valve to connect the first intermediate container to the plurality of core holders, while disconnecting the second intermediate container from the core holders;

[0037] Turn on the first booster pump to pressurize the intermediate container and the core holder;

[0038] Controlling the first six-way valve so that the first booster pump is disconnected from the first intermediate container and the second intermediate container;

[0039] Controlling the second six-way valve to disconnect the first intermediate container from the plurality of core holders, and to connect the second intermediate container to the core holders;

[0040] The third booster pump is controlled to open multiple back pressure valves and the outlet end of the core holder to conduct a simulation experiment of the gas well production process.

[0041] Furthermore, during the experiment, the following data were collected: Core holder outlet pressure Water output at core outlet and core water discharge time

[0042] in:

[0043] Furthermore, a switch valve is provided between the second booster pump and the core clamp.

[0044] Furthermore, a switch valve is provided between the third boosting pump and the back-pressure valve.

[0045] Furthermore, the core is of plunger type.

[0046] Furthermore, the core length is greater than or equal to 8 cm, and the diameter is greater than or equal to 2.5 cm.

[0047] By adopting the above technical solution, the present invention has the following advantages:

[0048] 1. The method of the present invention can realize the judgment of the type of water invasion channel of gas reservoirs by monitoring the change of water invasion saturation through nuclear magnetic resonance T2 spectrum, and uses nuclear magnetic resonance T2 spectrum to monitor the microscopic characteristics of core, which has the advantage of high judgment accuracy and provides an effective basis for water prevention and control.

[0049] 2. The pressure at the inlet of the core holder is collected during the experiment of the present invention. Core holder outlet pressure Water output at core outlet and core water discharge time It can be used together with water invasion saturation to comprehensively judge the main water invasion channel type with higher judgment accuracy.

[0050] 3. The present invention uses cores from different reservoirs in parallel to simulate different types of water invasion channels, and establishes temperature, pressure and water saturation conditions consistent with formation conditions, thereby solving the problems of inconsistency between experimental conditions and formation conditions and large differences between water invasion channel models and actual reservoirs in the current process of judging the reservoir type of water invasion channels in heterogeneous gas reservoirs.

[0051] 4. The present invention fully establishes the formation seepage conditions. Through the monitoring of the nuclear magnetic resonance T2 spectrum of the core, the change law of the fluid in the core can be obtained to realize the characterization of the fluid change law during water invasion, clarify the change law of the fluid in the microscopic pore throat during water invasion, and make the judgment of the reservoir type of water invasion channel in heterogeneous gas reservoirs more accurate, providing a basis for water prevention and control of heterogeneous gas reservoirs.

[0052] 5. The method of the present invention also has certain reference significance for judging the reservoir type of water invasion channels in carbonate gas reservoirs with developed fractures and caves. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0054] Figure 1 This is a flow chart of a method for determining the reservoir type of a water invasion channel in a heterogeneous gas reservoir according to an embodiment of the present invention;

[0055] Figure 2 It is a schematic diagram of the structure of the experiment in the embodiment of the present invention;

[0056] Figure 3 This is the nuclear magnetic resonance T2 spectrum of the core of the first reservoir in the embodiment of the present invention. NMR T2 spectroscopy and NMR T2 spectroscopy Comparison Figure 1 ;

[0057] Figure 4 This is the nuclear magnetic resonance T2 spectrum of the core of the second reservoir in the embodiment of the present invention. NMR T2 spectroscopy and NMR T2 spectroscopy Comparison Figure 2 ;

[0058] Figure 5This is the nuclear magnetic resonance T2 spectrum of the core of the third reservoir in the embodiment of the present invention. NMR T2 spectroscopy and NMR T2 spectroscopy Comparison Figure 3 ;

[0059] In the accompanying drawings: 10-constant temperature box, 21-first intermediate container, 22-second intermediate container, 23-first booster pump, 24-second booster pump, 25-third booster pump, 26-core clamp, 27-back pressure valve, 28-first six-way valve, 29-second six-way valve, 30-switch valve. DETAILED DESCRIPTION

[0060] The following description provides many different embodiments or examples for implementing different features of the present invention. The components and arrangements described in the following specific examples are only used to simplify the present invention and are only used as examples, not to limit the present invention.

[0061] In the description of the present invention, it should be understood that the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means multiple or more, unless otherwise clearly and specifically defined.

[0062] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of multiple components or the interaction relationship between multiple components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0063] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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] Example 1

[0065] This embodiment provides a method for determining the reservoir type of a water invasion channel in a heterogeneous gas reservoir, based on the core water invasion saturation S of each reservoir segment in the gas reservoir segment.N Determine the reservoir type of water invasion channel;

[0066] Where: N∈(1,2,...,n), n represents the number of reservoir segments.

[0067] Furthermore, according to the core water invasion saturation S of each reservoir section in the gas reservoir section N The water invasion channel reservoir type can be determined by judging the core type.

[0068] Furthermore, if Figure 1 As shown, the following steps are included:

[0069] Obtain cores from each reservoir section of the gas reservoir; preferably, the cores are plunger-shaped, with a plunger core length of greater than or equal to 8 cm and a diameter of greater than or equal to 2.5 cm; it should be noted that the size of the cores taken from each reservoir is preferably kept consistent to improve the accuracy of the experimental results;

[0070] Obtaining the NMR T2 spectrum of the core without water Obtaining the NMR T2 spectrum when the core is fully saturated Obtaining the NMR T2 spectrum without water During the process, the core needs to be centrifuged to completely remove the water in the core;

[0071] It should be noted that in order to eliminate the influence of oil and salt in the core on the results of the obtained nuclear magnetic resonance T2 spectrum, after obtaining the cores of each reservoir section of the gas reservoir, the cores were first treated to remove oil and salt;

[0072] A water invasion simulation experiment was conducted on a core with the same water saturation as that of each reservoir segment. After the experiment, the nuclear magnetic resonance T2 spectrum of the core was obtained.

[0073] By NMR T2 spectroscopy NMR T2 spectroscopy and NMR T2 spectroscopy Get water saturation S N .

[0074] Through water intrusion saturation S N When judging the type of water invasion channel reservoir, the nuclear magnetic resonance T2 spectrum is used NMR T2 spectroscopy and NMR T2 spectroscopy It can be used to determine the type of core in each reservoir section, and then the water invasion saturation S N The largest core is the main water invasion channel, and then combined with the type of core, the type of water invasion channel reservoir is obtained.

[0075] It should be noted that the above NMR T2 spectrum NMR T2 spectroscopy and NMR T2 spectroscopy The present invention does not limit the order of obtaining.

[0076] Preferably, the method comprises the following steps:

[0077] S100: Obtain the core of each reservoir section of the gas reservoir.

[0078] S200: Deoil, desalt and dry the core to obtain the nuclear magnetic resonance T2 spectrum of the dried core without water

[0079] S300: vacuuming and pressurizing the core dried in step S200 to saturate it with simulated formation water to obtain a nuclear magnetic resonance T2 spectrum when the core is fully saturated

[0080] S400: centrifugally remove water from the fully saturated core in step S300 to obtain a core having a water saturation equal to that of its reservoir section (i.e., the reservoir section where the core is located), and conduct a water invasion simulation experiment on the core to obtain a nuclear magnetic resonance T2 spectrum of the core after water invasion During the centrifugal operation, multiple cores are placed in the centrifuge together for centrifugation. In order to avoid excessive dehydration of the cores, the centrifugal force is slowly increased. Since the water saturation of each reservoir segment is not necessarily the same, during the centrifugal process, the cores of the reservoir with a large water saturation reach the standard first and are taken out of the centrifuge. The other cores that have not reached the water saturation equal to that of each reservoir segment continue to be centrifuged until the water saturation of all cores is equal to that of each reservoir segment, and the centrifugal operation is completed.

[0081] The centrifugal force increases in sequence of 0.5MPa, 1.0MPa, 1.5MPa, 2.0MPa, 2.5MPa, 3.0MPa, ...

[0082] S500: by NMR T2 spectroscopy NMR T2 spectroscopy and NMR T2 spectroscopy Get water saturation S N .

[0083] By nuclear magnetic resonance T2 spectroscopy NMR T2 spectroscopy and NMR T2 spectroscopy Limiting the order of obtaining has the advantages of convenient operation and simplified steps.

[0084] Furthermore, the water saturation

[0085]

[0086] Where: t NAQ ∈(t NA1 ,t NA2 ,...,t NAq ), t NAq Represents NMR T2 spectrum The ordinate of the qth point on the t NBQ ∈(t NB1 ,t NB2 ,...,t NBq ), t NBq Represents NMR T2 spectrum The ordinate of the qth point on the t NCQ ∈(t NC1 ,t NC2 ,...,t NCq ), t NCq Represents NMR T2 spectrum The ordinate of the qth point on the graph.

[0087] Furthermore, if Figure 2 As shown, the experimental device used in the water invasion simulation experiment includes a thermostatic box 10 and an experimental mechanism, the experimental mechanism is arranged in the thermostatic box 10, and the experimental mechanism includes a first intermediate container 21, a second intermediate container 22, a first booster pump, a second booster pump 24, a third booster pump 25, a plurality of core clamps 26, a plurality of back pressure valves 27, a first six-way valve 28 and a second six-way valve 29;

[0088] The first booster pump is connected to the first intermediate container 21 and the second intermediate container 22 through the first six-way valve 28, the first intermediate container 21 and the second intermediate container 22 are connected to the plurality of core holders 26 through the second six-way valve 29, and each core holder 26 is connected to a back pressure valve 27;

[0089] The second booster pump 24 is connected to a plurality of core holders 26 respectively;

[0090] The third boost pump 25 is connected to a plurality of back-pressure valves 27 respectively.

[0091] Furthermore, the first intermediate container 21 is filled with nitrogen, and the second intermediate container 22 is filled with formation water. The water invasion simulation experiment performed by the experimental device includes the following steps:

[0092] placing a core into a core holder 26;

[0093] Open the thermostat 10; establish formation temperature conditions;

[0094] Turn on the third booster pump 25 to keep the multiple back-pressure valves 27 closed;

[0095] Turn on the second booster pump 24 to apply confining pressure to the core holders 26 to establish the overburden pressure of the formation;

[0096] Control the first six-way valve 28 to connect the first booster pump with the first intermediate container 21 and the second intermediate container 22 to establish the original formation pressure;

[0097] Controlling the second six-way valve 29 to connect the first intermediate container 21 to the plurality of core holders 26, while disconnecting the second intermediate container 22 from the core holders 26;

[0098] Turn on the first booster pump 23 to pressurize the intermediate container and the core holder 26;

[0099] Controlling the first six-way valve 28 so that the first booster pump 23 is disconnected from the first intermediate container 21 and the second intermediate container 22;

[0100] Controlling the second six-way valve 29 to disconnect the first intermediate container 21 from the plurality of core holders 26 and to connect the second intermediate container 22 to the core holder 26;

[0101] The third booster pump 25 is controlled to open the multiple back pressure valves 27 and the outlet end of the core holder 26 to conduct a simulation experiment of the gas well production process.

[0102] Furthermore, during the experiment with the experimental device, the following data were collected: Core holder 26 outlet pressure Water output at core outlet and core water discharge time

[0103] in:

[0104] Furthermore, if Figure 2 As shown, a switch valve 30 is provided between the second booster pump 24 and the core clamp 26, and a switch valve 30 is provided between the third booster pump 25 and the back pressure valve 27; the setting of the switch valve 30 makes the control safer.

[0105] Example 2

[0106] The method described in Example 1 was used to determine the reservoir type of the water invasion channel of the Xu 2nd gas reservoir in a gas field. The gas reservoir section had three reservoir cores. The core ends were flattened to keep the lengths and diameters of all the plunger cores basically the same. The three plunger cores were 11.5 cm long and 2.5 cm in diameter.

[0107] The NMR T2 spectra of the three plunger cores were obtained respectively. NMR T2 spectroscopy and NMR T2 spectroscopy like Figure 3-Figure 5 As shown, where: Figure 3 This is the NMR T2 spectrum of the first core. NMR T2 spectroscopy and NMR T2 spectroscopy Comparison chart of

[0108] Figure 4 This is the NMR T2 spectrum of the second core. NMR T2 spectroscopy and NMR T2 spectroscopy Comparison chart of Figure 5 This is the NMR T2 spectrum of the third core. NMR T2 spectroscopy and NMR T2 spectroscopy Comparison chart. Figure 3 The calculated water invasion saturation S1 of the first core is 75.5%. At the same time, according to the figure, it is judged that the first core is a fracture-pore type; according to Figure 4 The calculated water invasion saturation S2 of the second core is 40.72%. At the same time, according to the figure, it is judged that the second core is fracture type; Figure 5 The calculated water invasion saturation S3 of the third core is 64.25%. At the same time, according to the figure, the third core is judged to be a void type; therefore, the water invasion channel reservoir type of the second section of the gas reservoir in this gas field is the first reservoir, which is a fracture-pore type.

[0109] Of course, the inlet pressure of the core holder 26 can also be obtained during the experiment. Core holder 26 outlet pressure Water output at core outlet and core water discharge time In the case of multiple reservoirs with equal water saturation, the pressure at the inlet of the core holder 26 can be used to Core holder 26 outlet pressure Water output at core outlet and core water discharge time The determination of the reservoir type of the water invasion channel increases the scope of application of the method of the present invention. Specifically, the pressure at the inlet of the core holder 26 and the core holder 26 outlet pressure Used to calculate the flow pressure difference at both ends of the core. The smaller the pressure difference, the core with the main water invasion channel; the water output at the core outlet The larger core is the core of the main water invasion channel; the water outflow time of the core The smaller one is the core of the main water invasion channel.

[0110] It should be noted that the core type can also be determined by the core porosity and permeability.

[0111] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein; and these modifications or substitutions do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for determining the reservoir type of water invasion channel in a heterogeneous gas reservoir, characterized in that: According to the core water invasion saturation S of each reservoir section in the gas reservoir N Determine the reservoir type of water invasion channel; Where: N∈(1,2,...,n), n represents the number of reservoir segments.

2. The method for determining the reservoir type of water invasion channel in a heterogeneous gas reservoir according to claim 1, characterized in that: According to the core water invasion saturation S of each reservoir section in the gas reservoir N The water invasion channel reservoir type can be determined by judging the core type.

3. A method for determining the reservoir type of water invasion channel in a heterogeneous gas reservoir according to claim 1 or 2, characterized in that: The steps include: Obtain cores from various reservoir sections of the gas reservoir; Obtaining the NMR T2 spectrum of the core without water Obtaining the NMR T2 spectrum when the core is fully saturated A water invasion simulation experiment was conducted on a core with the same water saturation as that of each reservoir segment. After the experiment, the nuclear magnetic resonance T2 spectrum of the core was obtained. By NMR T2 spectroscopy NMR T2 spectroscopy and NMR T2 spectroscopy Get water saturation S N ; in: represents the NMR T2 spectrum T of the nth reservoir A ; represents the NMR T2 spectrum T of the nth reservoir B ; represents the NMR T2 spectrum T of the nth reservoir C .

4. A method for determining the reservoir type of water invasion channel in a heterogeneous gas reservoir according to claim 3, characterized in that: The steps include: S100: obtaining cores of each reservoir section of the gas reservoir; S200: Deoil, desalt and dry the core to obtain the nuclear magnetic resonance T2 spectrum of the dried core without water S300: vacuuming and pressurizing the core dried in step S200 to saturate it with simulated formation water to obtain a nuclear magnetic resonance T2 spectrum when the core is fully saturated S400: centrifugally remove water from the fully saturated core in step S300 to obtain a core having a water saturation equal to that of its reservoir section, and conduct a water invasion simulation experiment on the core to obtain a nuclear magnetic resonance T2 spectrum of the core after water invasion S500: by NMR T2 spectroscopy NMR T2 spectroscopy and NMR T2 spectroscopy Get water saturation S N .

5. A method for determining the reservoir type of water invasion channel in a heterogeneous gas reservoir according to claim 3 or 4, characterized in that: The water saturation Where: t NAQ ∈(t NA1 ,t NA2 ,...,t NAq ), t NAq Represents NMR T2 spectrum The ordinate of the qth point on the t NBQ ∈(t NB1 ,t NB2 ,...,t NBq ), t NBq Represents NMR T2 spectrum The ordinate of the qth point on the t NCQ ∈(t NC1 ,t NC2 ,...,t NCq ), t NCq Represents NMR T2 spectrum The ordinate of the qth point on the graph.

6. A method for determining the reservoir type of water invasion channel in a heterogeneous gas reservoir according to claim 3 or 4, characterized in that: The experimental device used in the water invasion simulation experiment includes a constant temperature box and an experimental mechanism, wherein the experimental mechanism is arranged in the constant temperature box, and the experimental mechanism includes a first intermediate container, a second intermediate container, a first booster pump, a second booster pump, a third booster pump, a plurality of core clamps, a plurality of back pressure valves, a first six-way valve, and a second six-way valve; The first booster pump is connected to the first intermediate container and the second intermediate container respectively through the first six-way valve, the first intermediate container and the second intermediate container are connected to the plurality of core holders through the second six-way valve, and each core holder is connected to a back pressure valve respectively; The second booster pumps are respectively connected to a plurality of core holders; The third boost pump is connected to a plurality of back-pressure valves respectively.

7. A method for determining the reservoir type of water invasion channel in a heterogeneous gas reservoir according to claim 6, characterized in that: The first intermediate container is filled with nitrogen, and the second intermediate container is filled with formation water. The water invasion simulation experiment is performed by the experimental device, including the following steps: Place a core into a core holder; Open the thermostat; Turn on the third booster pump to keep the multiple back-pressure valves closed; Turn on the second booster pump to apply confining pressure to the multiple core holders; Controlling the first six-way valve to connect the first booster pump with the first intermediate container and the second intermediate container; Controlling the second six-way valve to connect the first intermediate container to the plurality of core holders, while disconnecting the second intermediate container from the core holders; Turn on the first booster pump to pressurize the intermediate container and the core holder; Controlling the first six-way valve so that the first booster pump is disconnected from the first intermediate container and the second intermediate container; Controlling the second six-way valve to disconnect the first intermediate container from the plurality of core holders, and to connect the second intermediate container to the core holders; The third booster pump is controlled to open multiple back pressure valves and the outlet end of the core holder to conduct a simulation experiment of the gas well production process.

8. A method for determining the reservoir type of water invasion channel in a heterogeneous gas reservoir according to claim 6 or 7, characterized in that: During the experiment with this experimental device, the following data were collected: the pressure at the inlet of the core holder Core holder outlet pressure Water output at core outlet and core water discharge time in:

9. A method for determining the reservoir type of water invasion channel in a heterogeneous gas reservoir according to claim 6, characterized in that: A switch valve is provided between the second booster pump and the core holder.

10. A method for determining reservoir type of water invasion channel in heterogeneous gas reservoir according to claim 6, characterized in that: A switch valve is provided between the third boost pump and the back-pressure valve.

11. A method for determining reservoir type of water invasion channel in heterogeneous gas reservoir according to claim 6, characterized in that: The core is of the plunger type.

12. A method for determining reservoir type of water invasion channel in heterogeneous gas reservoir according to claim 11, characterized in that: The core length is greater than or equal to 8 cm, and the diameter is greater than or equal to 2.5 cm.

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