Experimental device and method for heat conduction and heat transfer inside and outside shaft in deep geological energy drilling and production process

Abstract

The invention discloses a heat conduction and transfer experiment device and method inside and outside a shaft in the deep geological energy drilling and production process, and belongs to the technical field of deep geological energy drilling and production. An inner pipe is arranged in the simulation wellbore, and an annulus is formed between the inner pipe and the simulation wellbore; the upper end of the inner pipe is connected with the positive circulation injection branch pipe and the reverse circulation backflow branch pipe; the upper end of the annulus is connected with a reverse circulation injection branch pipe and a positive circulation reverse flow branch pipe; an injection control valve, an injection flowmeter, an injection temperature sensor and an injection pressure sensor are arranged on each of the positive circulation injection branch pipe and the reverse circulation injection branch pipe; each of the positive circulation reflux branch pipe and the reverse circulation reflux branch pipe is provided with a reflux control valve, a reflux pressure sensor and a reflux temperature sensor; and a shaft bottom annulus temperature tester is arranged at the tail end, far away from the wellhead, of the annulus. According to the invention, experimental data of temperature changes of fluid in the shaft and strata outside the shaft can be obtained, and data support is provided for optimizing a deep geological energy drilling and production technology.

Description

Technical Field

[0001] The invention belongs to the technical field of deep geological energy drilling and production, and in particular relates to an experimental device and method for heat conduction and heat transfer inside and outside a wellbore in a deep geological energy drilling and production process. Background Art

[0002] The deep layers of the earth are rich in geological energy such as oil, natural gas and geothermal energy. Advancing into the deep layers is of great significance for "holding a stable energy bowl for my country". However, as the depth of the deep layers continues to increase, the formation temperature gradually increases. The rising downhole temperature will lead to insufficient temperature resistance of drilling and production equipment, and the instability of fluid properties such as drilling fluid, which seriously restricts the progress of advancing to deeper layers. For example, high downhole temperature will cause conventional rubber screw drilling tools to be unusable and drilling fluid to deteriorate, limiting the drilling speed and restricting the drilling depth. In-depth revelation of the heat conduction and heat transfer characteristics inside and outside the wellbore during the deep geological energy drilling process is the key to optimizing downhole tools, optimizing the properties of drilling fluids, and realizing downhole temperature drop and thermal energy utilization. The changes in the temperature of the fluid in the wellbore and the formation outside the wellbore can reflect the heat conduction and heat transfer characteristics inside and outside the wellbore.

[0003] Experiments are the most critical technical means to reveal the changes in fluids inside the wellbore and temperature of the formations outside the wellbore during deep geological energy drilling and production. However, so far, no supporting experimental equipment and methods have been formed.

[0004] Therefore, there is an urgent need to develop an experimental device and method for heat conduction and heat transfer inside and outside the wellbore during the deep geological energy drilling and production process, which can obtain experimental data on the temperature changes of the fluid in the wellbore and the formation outside the wellbore for studying the heat conduction and heat transfer characteristics inside and outside the wellbore during the drilling and production process, and provide data support for optimizing deep geological energy drilling and production technology. Summary of the invention

[0005] The purpose of the present invention is to overcome the deficiencies of the above-mentioned prior art and to provide a heat conduction and heat transfer experimental device inside and outside the wellbore during the deep geological energy drilling process.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] The heat conduction and heat transfer experimental device for the deep geological energy drilling process includes a simulated wellbore, and the outside of the simulated wellbore is provided with a heating part for simulating the formation temperature;

[0008] An inner tube is arranged inside the simulated wellbore, an annulus is formed between the inner tube and the simulated wellbore, the top of the annulus is blocked, and the bottom of the annulus is connected to the inner tube;

[0009] The upper end of the inner tube is connected to the positive circulation injection branch pipe, and the upper end of the inner tube is connected to the reverse circulation reflux branch pipe;

[0010] The upper end of the annulus is connected to the reverse circulation injection branch pipe, and the upper end of the annulus is connected to the forward circulation reverse flow branch pipe;

[0011] The positive circulation injection branch pipe and the reverse circulation injection branch pipe are both connected to the output end of the injection pump, and the input end of the injection pump is connected to the injection liquid container; the positive circulation injection branch pipe and the reverse circulation injection branch pipe are both provided with an injection control valve, an injection flow meter, an injection temperature sensor, and an injection pressure sensor;

[0012] The positive circulation reflux branch pipe and the reverse circulation reflux branch pipe are both connected to a cooling pipeline in the cooling box, and the other end of the cooling pipeline is connected to the injection liquid container; the positive circulation reflux branch pipe and the reverse circulation reflux branch pipe are both provided with a reflux control valve, a reflux pressure sensor, and a reflux temperature sensor;

[0013] A bottom hole annulus temperature tester is arranged at the end of the annulus away from the wellhead.

[0014] Preferably, the heating part comprises a plurality of sections of electric heating wires arranged in sequence along the axial direction of the simulated wellbore, and the electric heating wires are wound around the outside of the simulated wellbore;

[0015] The electric heating wire is electrically connected to the heating power regulator;

[0016] A simulated formation temperature tester for detecting temperature is arranged on the simulated wellbore wall around which each electric heating wire is wound.

[0017] Preferably, the simulated wellbore includes a first well section extending in a vertical direction, a third well section extending in a horizontal direction, and a second well section connecting the first well section and the third well section.

[0018] The present invention also provides a method for conducting heat transfer inside and outside a wellbore during deep geological energy drilling and production.

[0019] The experimental method of heat conduction and heat transfer inside and outside the wellbore during deep geological energy drilling and production is implemented based on the experimental device of heat conduction and heat transfer inside and outside the wellbore during deep geological energy drilling and production, including positive circulation method, reverse circulation method, and gas-based energy production method;

[0020] In the positive circulation method, the working fluid is injected downward along the inner tube and discharged upward along the annulus;

[0021] In the reverse circulation method, the working fluid is injected downward along the annulus and discharged upward along the inner tube;

[0022] In the gas-based energy recovery method, the working fluid is injected downward along the inner tube in the form of liquid and output upward along the annulus in the form of gas.

[0023] Preferably, the positive cycle method comprises the following steps:

[0024] Step 11, filling the liquid injection container with the working fluid required for the positive cycle experiment;

[0025] Step 12, determining the injection flow rate value, the backflow pressure value and the preset heating temperature of each electric heating wire for the corresponding simulated wellbore section;

[0026] Step 13, turning on the heating power regulator, adjusting the output power of the heating power regulator to each electric heating wire, and monitoring the temperature change of each simulated formation temperature tester in real time; when the temperature value tested by each simulated formation temperature tester reaches the preset heating temperature of the corresponding simulated wellbore section, the output power of the heating power regulator to each electric heating wire remains unchanged;

[0027] Close the injection control valve on the reverse circulation injection branch and the backflow control valve on the reverse circulation backflow branch, adjust the opening of the backflow control valve on the positive circulation backflow branch and the injection control valve on the positive circulation injection branch, start the injection pump, make the data of the injection flow meter on the positive circulation injection branch reach the injection flow value, and the data of the backflow pressure sensor on the positive circulation backflow branch reach the backflow pressure value, the working fluid injected into the liquid container is injected downwardly through the positive circulation injection branch and the inner pipe, and then output upwardly from the end of the inner pipe through the annulus, and then return to the injection liquid container through the positive circulation backflow branch and the cooling pipeline, so as to realize the positive circulation of the working fluid;

[0028] In this process, the temperature changes of each simulated formation temperature tester are monitored in real time. When the temperature values ​​tested by each simulated formation temperature tester fluctuate within the corresponding error range and tend to be stable, the experimental debugging is completed;

[0029] After the experimental debugging is completed, the test data of the injection temperature sensor and injection pressure sensor on the positive circulation injection branch pipe, the reverse flow pressure sensor and reverse flow temperature sensor on the positive circulation reverse flow branch pipe, and each simulated formation temperature tester and the bottom hole annulus temperature tester 22 are recorded;

[0030] Step 14, changing the opening value of the backflow control valve on the forward circulation backflow branch pipe for multiple times to conduct an experiment on the influence of the backflow pressure on the heat conduction and heat transfer characteristics;

[0031] For each positive cycle reverse flow branch pipe, the opening value of the reverse flow control valve is:

[0032] When the temperature values ​​tested by each simulated formation temperature tester fluctuate within the corresponding error range and tend to be stable, record the test data of the injection temperature sensor and injection pressure sensor on the positive circulation injection branch pipe, the reverse flow pressure sensor and reverse flow temperature sensor on the positive circulation reverse flow branch pipe, and each simulated formation temperature tester and the bottom hole annulus temperature tester;

[0033] Step 15, perform the experimental debugging in step 13, then adjust the opening of the injection control valve on the positive circulation injection branch pipe for multiple times, obtain multiple test flow values ​​of the injection flow meter on the positive circulation injection branch pipe, and perform an experiment on the influence of the injection flow on the heat conduction and heat transfer characteristics;

[0034] For each positive circulation injection branch pipe, the test flow value of the injection flow meter is:

[0035] When the temperature values ​​tested by each simulated formation temperature tester fluctuate within the corresponding error range and tend to be stable, record the test data of the injection temperature sensor and injection pressure sensor on the positive circulation injection branch pipe, the reverse flow pressure sensor and reverse flow temperature sensor on the positive circulation reverse flow branch pipe, and each simulated formation temperature tester and the bottom hole annulus temperature tester;

[0036] Step 16, perform the experimental debugging in step 13, then adjust the output power of the heating power regulator to each electric heating line for multiple times, obtain multiple groups of simulated formation temperature values, and conduct an experiment on the influence of formation temperature on heat conduction and heat transfer characteristics;

[0037] For each group, adjust the output power of the heating power controller to each electric heating line:

[0038] When the temperature values ​​tested by each simulated formation temperature tester fluctuate within the corresponding error range and tend to be stable, record the test data of the injection temperature sensor, injection pressure sensor on the positive circulation injection branch, the backflow pressure sensor, backflow temperature sensor on the positive circulation backflow branch, each simulated formation temperature tester and the bottom hole annulus temperature tester.

[0039] Preferably, the reverse circulation method comprises the following steps:

[0040] Step 21, filling the liquid injection container with the working fluid required for the reverse circulation experiment;

[0041] Step 22, determining the injection flow rate value, the backflow pressure value and the preset heating temperature of each electric heating wire for the corresponding simulated wellbore section;

[0042] Step 23, turning on the heating power regulator, adjusting the output power of the heating power regulator to each electric heating wire, and monitoring the temperature change of each simulated formation temperature tester in real time; when the temperature value tested by each simulated formation temperature tester reaches the preset heating temperature of the corresponding simulated wellbore section, the output power of the heating power regulator to each electric heating wire remains unchanged;

[0043] Close the injection control valve on the positive circulation injection branch and the backflow control valve on the positive circulation backflow branch, adjust the opening of the backflow control valve on the reverse circulation backflow branch and the injection control valve on the reverse circulation injection branch, start the injection pump, make the data of the injection flow meter on the reverse circulation injection branch reach the injection flow value, and the data of the backflow pressure sensor on the reverse circulation backflow branch reach the backflow pressure value, the working fluid injected into the liquid container is injected downward through the reverse circulation injection branch and the annulus, and then output upward from the end of the annulus through the inner pipe, and then return to the injection liquid container through the reverse circulation backflow branch and the cooling pipeline, so as to realize the reverse circulation of the working fluid;

[0044] In this process, the temperature changes of each simulated formation temperature tester are monitored in real time. When the temperature values ​​tested by each simulated formation temperature tester fluctuate within the corresponding error range and tend to be stable, the experimental debugging is completed;

[0045] After the experimental debugging is completed, the test data of the injection temperature sensor, injection pressure sensor on the reverse circulation injection branch pipe, the reverse flow pressure sensor, reverse flow temperature sensor on the reverse circulation reverse flow branch pipe, and each simulated formation temperature tester and the bottom hole annulus temperature tester are recorded;

[0046] Step 24, changing the opening value of the reverse flow control valve on the reverse circulation reverse flow branch pipe for multiple times to conduct an experiment on the influence of the reverse flow pressure on the heat conduction and heat transfer characteristics;

[0047] For each reverse circulation reverse flow branch, the opening value of the reverse flow control valve is:

[0048] When the temperature values ​​tested by each simulated formation temperature tester fluctuate within the corresponding error range and tend to be stable, record the test data of the injection temperature sensor, injection pressure sensor on the reverse circulation injection branch pipe, the reverse flow pressure sensor, reverse flow temperature sensor on the reverse circulation reverse flow branch pipe, each simulated formation temperature tester and the bottom hole annulus temperature tester;

[0049] Step 25, performing the experimental debugging in step 23, and then adjusting the opening of the injection control valve on the reverse circulation injection branch pipe for multiple times, obtaining multiple test flow values ​​of the injection flow meter on the reverse circulation injection branch pipe, and performing an experiment on the effect of the injection flow on the heat conduction and heat transfer characteristics;

[0050] For each reverse circulation injection branch pipe, the test flow value of the injection flow meter is:

[0051] When the temperature values ​​tested by each simulated formation temperature tester fluctuate within the corresponding error range and tend to be stable, record the test data of the injection temperature sensor, injection pressure sensor on the reverse circulation injection branch pipe, the reverse flow pressure sensor, reverse flow temperature sensor on the reverse circulation reverse flow branch pipe, each simulated formation temperature tester and the bottom hole annulus temperature tester;

[0052] Step 26, perform the experimental debugging in step 23, then adjust the output power of the heating power regulator to each electric heating line for multiple times, obtain multiple groups of simulated formation temperature values, and conduct an experiment on the influence of formation temperature on heat conduction and heat transfer characteristics;

[0053] For each group, adjust the output power of the heating power controller to each electric heating line:

[0054] When the temperature values ​​tested by each simulated formation temperature tester fluctuate within the corresponding error range and tend to be stable, record the test data of the injection temperature sensor, injection pressure sensor on the reverse circulation injection branch, the reverse flow pressure sensor, reverse flow temperature sensor on the reverse circulation reverse flow branch, each simulated formation temperature tester and the bottom hole annulus temperature tester.

[0055] Preferably, a pressure generator is provided on the positive circulation reverse flow branch pipe.

[0056] Preferably, the third well section is a heat-conducting pipe, and a heat-insulating sleeve is coaxially sleeved on the outer wall of the first well section, the second well section and the inner pipe.

[0057] Preferably, an atomizing nozzle is provided at the end of the inner tube away from the wellhead;

[0058] The atomizing nozzle comprises a shell coaxially fixedly arranged at the end of the inner tube, and a nozzle is fixedly arranged at one end of the shell away from the inner tube;

[0059] A swirl mechanism is rotatably arranged in the shell, and the swirl mechanism includes a central axis, on which spirally wound swirl blades are arranged, and a bearing is arranged at one end of the central axis away from the nozzle, and the outer ring of the bearing is fixedly connected to the radial inner side of the support member, and the radial outer side of the support member is fixedly connected to the shell, and the support member is provided with a through hole for fluid to pass through.

[0060] Preferably, the gas-based energy recovery method comprises the following steps:

[0061] Step 31, filling the liquid injection container with the working fluid required for the gas-based energy extraction experiment;

[0062] Step 32, determining the injection flow rate value, the backflow pressure value and the preset heating temperature of each electric heating wire for the corresponding simulated wellbore section;

[0063] Step 33, turn on the heating power regulator, adjust the output power of the heating power regulator to each electric heating wire, and monitor the temperature change of each simulated formation temperature tester in real time; when the temperature value tested by each simulated formation temperature tester reaches the preset heating temperature of the corresponding simulated wellbore section, the output power of the heating power regulator to each electric heating wire remains unchanged;

[0064] Close the injection control valve on the reverse circulation injection branch and the backflow control valve on the reverse circulation backflow branch, adjust the opening of the backflow control valve on the positive circulation backflow branch and the injection control valve on the positive circulation injection branch, start the injection pump, make the data of the injection flow meter on the positive circulation injection branch reach the injection flow value, and the data of the backflow pressure sensor on the positive circulation backflow branch reach the backflow pressure value, the working fluid injected into the liquid container is injected downward through the positive circulation injection branch and the inner tube, and then atomized and sprayed out by the atomizing nozzle at the end of the inner tube, the atomized working fluid is vaporized in the annulus, output upward along the annulus in the form of gas, and then enters the pressure generator through the positive circulation backflow branch to generate electricity, realizing the conversion from thermal energy to mechanical energy and then to electrical energy, the gas after pressure release enters the cooling pipeline, cools down and becomes liquid, and flows back to the injection liquid container, realizing the working fluid circulation;

[0065] In this process, the temperature changes of each simulated formation temperature tester are monitored in real time. When the temperature values ​​tested by each simulated formation temperature tester fluctuate within the corresponding error range and tend to be stable, the experimental debugging is completed;

[0066] After the experimental debugging is completed, the test data of the injection temperature sensor, injection pressure sensor on the positive circulation injection branch, the reverse flow pressure sensor, reverse flow temperature sensor, pressure generator, various simulated formation temperature testers and bottom hole annulus temperature tester are recorded;

[0067] Step 34, changing the opening value of the backflow control valve on the forward circulation backflow branch pipe multiple times to conduct an experiment on the influence of the backflow pressure on the heat conduction and heat transfer characteristics;

[0068] For each positive cycle reverse flow branch pipe, the opening value of the reverse flow control valve is:

[0069] When the temperature values ​​tested by each simulated formation temperature tester fluctuate within the corresponding error range and tend to be stable, record the test data of the injection temperature sensor, injection pressure sensor on the positive circulation injection branch pipe, the reverse flow pressure sensor, reverse flow temperature sensor, pressure generator on the positive circulation reverse flow branch pipe, and each simulated formation temperature tester and the bottom hole annulus temperature tester;

[0070] Step 35, perform the experimental debugging in step 33, then adjust the opening of the injection control valve on the positive circulation injection branch pipe for multiple times, obtain multiple test flow values ​​of the injection flow meter on the positive circulation injection branch pipe, and perform an experiment on the influence of the injection flow on the heat conduction and heat transfer characteristics;

[0071] For each positive circulation injection branch pipe, the test flow value of the injection flow meter is:

[0072] When the temperature values ​​tested by each simulated formation temperature tester fluctuate within the corresponding error range and tend to be stable, record the test data of the injection temperature sensor, injection pressure sensor on the positive circulation injection branch pipe, the reverse flow pressure sensor, reverse flow temperature sensor, pressure generator on the positive circulation reverse flow branch pipe, and each simulated formation temperature tester and the bottom hole annulus temperature tester;

[0073] Step 36, perform the experimental debugging in step 33, then adjust the output power of the heating power regulator to each electric heating line for multiple times, obtain multiple groups of simulated formation temperature values, and conduct an experiment on the influence of formation temperature on heat conduction and heat transfer characteristics;

[0074] For each group, adjust the output power of the heating power controller to each electric heating line:

[0075] When the temperature values ​​tested by each simulated formation temperature tester fluctuate within the corresponding error range and tend to be stable, record the test data of the injection temperature sensor, injection pressure sensor on the positive circulation injection branch, the reverse flow pressure sensor, reverse flow temperature sensor, pressure generator on the positive circulation reverse flow branch, and each simulated formation temperature tester and the bottom hole annulus temperature tester.

[0076] The beneficial effects of the present invention are:

[0077] (1) In the heat conduction and heat transfer experimental device for the deep geological energy drilling and production process of the present invention, the injection temperature sensor, the backflow temperature sensor, and the bottom hole annulus temperature tester are set to realize the test of the temperature change before and after the heat transfer between the fluid in the wellbore and the simulated formation; the heating part in the present application includes a plurality of sections of electric heating wires arranged in sequence along the axial direction of the simulated wellbore, and the heating power regulator controls the heating power of each electric heating wire. By heating the simulated wellbore in sections, the simulation of the formation temperature is realized, and the simulated wellbore sections are each provided with a simulated formation temperature tester, which can monitor the temperature change of each section in real time, so as to obtain the temperature change of the simulated formation before and after the heat exchange with the fluid in the simulated wellbore through the experiment, that is, it is possible to obtain the experimental data of the temperature change of the fluid in the wellbore and the formation outside the wellbore for studying the heat conduction and heat transfer characteristics inside and outside the wellbore during the drilling and production process, thereby providing data support for optimizing the deep geological energy drilling and production technology.

[0078] (2) In the gas energy extraction method of the present invention, the working fluid is injected downward along the inner tube in liquid form and output upward along the annulus in gas form, driving the ground pressure generator to generate electricity, thereby realizing experimental simulation research on high-temperature formation thermal energy encountered during deep geological energy drilling. BRIEF DESCRIPTION OF THE DRAWINGS

[0079] The drawings in the specification, which constitute a part of the present application, are used to provide further understanding of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute improper limitations on the present application.

[0080] Figure 1 It is a structural schematic diagram of a heat conduction and heat transfer experimental device inside and outside a wellbore during deep geological energy drilling and production of the present invention;

[0081] Figure 2 It is a structural schematic diagram of the atomizing nozzle in the present invention;

[0082] Figure 3 It is a structural schematic diagram of the swirl mechanism in the present invention;

[0083] Figure 4 It is a schematic diagram of the matching of the support member and the bearing in the present invention;

[0084] in:

[0085] 1-simulated wellbore, 2-inner pipe, 3-annulus, 4-electric heating wire, 5-positive circulation injection branch, 6-reverse circulation backflow branch, 7-reverse circulation injection branch, 8-positive circulation backflow branch, 9-injection pump, 10-injection liquid container, 11-injection control valve, 12-cooling box, 13-cooling pipeline, 14-backflow control valve, 15-injection flowmeter, 16-injection temperature sensor, 17-backflow pressure sensor, 18-backflow temperature sensor, 19-injection pressure sensor, 20-heating power regulator, 21-simulated formation temperature tester, 22-bottom hole annulus temperature tester, 23-atomizing nozzle, 231-shell, 232-nozzle, 233-central shaft, 234-swirl blade, 235-bearing, 236-support, 237-through hole, 24-pressure generator. DETAILED DESCRIPTION

[0086] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0087] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0088] In the present invention, the directions or positional relationships indicated by terms such as "upper", "lower", "bottom", "top", etc. are based on the directions or positional relationships shown in the accompanying drawings. They are relational words determined only for the convenience of describing the structural relationships of the various parts or elements of the present invention. They do not specifically refer to any part or element in the present invention and cannot be understood as limitations on the present invention.

[0089] In the present invention, terms such as "connected" and "connection" should be understood in a broad sense, indicating that the connection can be fixed, integral or detachable; it can be directly connected or indirectly connected through an intermediate medium. Relevant scientific research or technical personnel in this field can determine the specific meaning of the above terms in the present invention according to specific circumstances, and they should not be understood as limiting the present invention.

[0090] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0091] Embodiment 1:

[0092] like Figure 1 As shown, the heat conduction and heat transfer experimental device inside and outside the wellbore during the deep geological energy drilling process includes a simulated wellbore 1, and the outside of the simulated wellbore 1 is provided with a heating part for simulating the formation temperature;

[0093] An inner tube 2 is provided inside the simulated wellbore 1, and an annulus 3 is formed between the inner tube 2 and the simulated wellbore 1. The top of the annulus 3 is blocked, and the bottom of the annulus 3 is connected to the inner tube 2.

[0094] The upper end of the inner tube 2 is connected to the positive circulation injection branch 5, and the upper end of the inner tube 2 is connected to the reverse circulation backflow branch 6;

[0095] The upper end of the annulus 3 is connected to the reverse circulation injection branch pipe 7, and the upper end of the annulus 3 is connected to the forward circulation reverse flow branch pipe 8;

[0096] The positive circulation injection branch pipe 5 and the reverse circulation injection branch pipe 7 are both connected to the output end of the injection pump 9, and the input end of the injection pump 9 is connected to the injection liquid container 10; the positive circulation injection branch pipe 5 and the reverse circulation injection branch pipe 7 are both provided with an injection control valve 11, an injection flow meter 15, an injection temperature sensor 16, and an injection pressure sensor 19;

[0097] The forward circulation backflow branch pipe 8 and the reverse circulation backflow branch pipe 6 are both connected to a cooling pipeline 13 located in a cooling box 12, and the other end of the cooling pipeline 13 is connected to an injection liquid container 10; the forward circulation backflow branch pipe 8 and the reverse circulation backflow branch pipe 6 are both provided with a backflow control valve 14, a backflow pressure sensor 17, and a backflow temperature sensor 18;

[0098] A bottom hole annulus temperature tester 22 is provided at the end of the annulus 3 away from the wellhead.

[0099] Preferably, the heating part comprises a plurality of electric heating wires 4 arranged in sequence along the axial direction of the simulated wellbore 1, and the electric heating wires 4 are wound around the outside of the simulated wellbore 1;

[0100] The electric heating wire 4 is electrically connected to the heating power regulator 20;

[0101] A simulated formation temperature tester 21 for detecting temperature is arranged on the wall of the simulated wellbore 1 around which each electric heating wire 4 is wound.

[0102] Preferably, the simulated wellbore 1 includes a first well section extending in a vertical direction, a third well section extending in a horizontal direction, and a second well section connecting the first well section and the third well section.

[0103] Embodiment 2:

[0104] The deep geological energy drilling and production process heat conduction and heat transfer experimental method is implemented based on the deep geological energy drilling and production process heat conduction and heat transfer experimental device in Example 1, including a positive circulation method, a reverse circulation method, and a gas-based energy production method;

[0105] In the positive circulation method, the working fluid is injected downward along the inner tube 2 and discharged upward along the annulus 3;

[0106] In the reverse circulation method, the working fluid is injected downward along the annulus 3 and discharged upward along the inner tube 2;

[0107] In the gas-based energy recovery method, the working fluid is injected downward along the inner tube 2 in the form of liquid and is output upward along the annulus 3 in the form of gas.

[0108] Embodiment 3:

[0109] Based on Example 2, the positive cycle method comprises the following steps:

[0110] Step 11, filling the liquid container 10 with the working fluid required for the positive cycle experiment, which may be water;

[0111] Step 12, determining the injection flow rate value, the backflow pressure value and the preset heating temperature of each electric heating wire 4 for the corresponding simulated wellbore section;

[0112] Step 13, turning on the heating power regulator 20, adjusting the output power of the heating power regulator 20 to each electric heating wire 4, and monitoring the temperature change of each simulated formation temperature tester 21 in real time; when the temperature value tested by each simulated formation temperature tester 21 remains within the preset heating temperature range of the corresponding simulated wellbore section, the output power of the heating power regulator 20 to each electric heating wire 4 remains unchanged;

[0113] Close the injection control valve 11 on the reverse circulation injection branch pipe 7 and the reverse flow control valve 14 on the reverse circulation reverse flow branch pipe 6, adjust the opening of the reverse flow control valve 14 on the positive circulation reverse flow branch pipe 8 and the injection control valve 11 on the positive circulation injection branch pipe 5, start the injection pump 9, make the data of the injection flow meter 15 on the positive circulation injection branch pipe 5 reach the injection flow value, and the data of the reverse flow pressure sensor 17 on the positive circulation reverse flow branch pipe 8 reach the reverse flow pressure value, and the working medium injected into the liquid container 10 is injected downwardly through the positive circulation injection branch pipe 5 and the inner pipe 2, and then output upwardly from the end of the inner pipe 2 through the annulus 3, and then return to the injection liquid container 10 through the positive circulation reverse flow branch pipe 8 and the cooling pipeline 13, so as to realize the positive circulation of the working medium;

[0114] In this process, the temperature changes of each simulated formation temperature tester 21 are monitored in real time. When the temperature values ​​tested by each simulated formation temperature tester 21 fluctuate within the corresponding error range and tend to be stable, the experimental debugging is completed;

[0115] After the experimental debugging is completed, the test data of the injection temperature sensor 16, the injection pressure sensor 19 on the positive circulation injection branch pipe 5, the reverse flow pressure sensor 17, the reverse flow temperature sensor 18 on the positive circulation reverse flow branch pipe 8, and each simulated formation temperature tester 21 and the bottom hole annulus temperature tester 22 are recorded;

[0116] Step 14, changing the opening value of the backflow control valve 14 on the forward circulation backflow branch 8 for multiple times to conduct an experiment on the effect of the backflow pressure on the heat conduction and heat transfer characteristics;

[0117] For each positive cycle reverse flow branch pipe 8, the opening value of the reverse flow control valve 14 is:

[0118] When the temperature values ​​tested by each simulated formation temperature tester 21 fluctuate within the corresponding error range to tend to be stable, record the test data of the injection temperature sensor 16, injection pressure sensor 19 on the positive circulation injection branch pipe 5, the reverse flow pressure sensor 17, reverse flow temperature sensor 18 on the positive circulation reverse flow branch pipe 8, each simulated formation temperature tester 21 and the bottom hole annulus temperature tester 22;

[0119] Step 15, perform the experimental debugging in step 13, then adjust the opening of the injection control valve 11 on the positive circulation injection branch pipe 5 for multiple times, obtain multiple test flow values ​​of the injection flow meter 15 on the positive circulation injection branch pipe 5, and perform an experiment on the influence of the injection flow on the heat conduction and heat transfer characteristics;

[0120] For each positive circulation injection branch pipe 5, the test flow value of the injection flow meter 15 is:

[0121] When the temperature values ​​tested by each simulated formation temperature tester 21 fluctuate within the corresponding error range to tend to be stable, record the test data of the injection temperature sensor 16, injection pressure sensor 19 on the positive circulation injection branch pipe 5, the reverse flow pressure sensor 17, reverse flow temperature sensor 18 on the positive circulation reverse flow branch pipe 8, each simulated formation temperature tester 21 and the bottom hole annulus temperature tester 22;

[0122] Step 16, perform the experimental debugging in step 13, then adjust the output power of the heating power regulator 20 to each electric heating line 4 for multiple times, obtain multiple groups of simulated formation temperature values, and conduct an experiment on the influence of formation temperature on heat conduction and heat transfer characteristics;

[0123] For each group, the output power of the heating power regulator 20 to each electric heating wire 4 is adjusted:

[0124] When the temperature values ​​tested by each simulated formation temperature tester 21 fluctuate within the corresponding error range and tend to be stable, record the test data of the injection temperature sensor 16, injection pressure sensor 19 on the positive circulation injection branch 5, the reverse flow pressure sensor 17, reverse flow temperature sensor 18 on the positive circulation reverse flow branch 8, and each simulated formation temperature tester 21 and the bottom hole annulus temperature tester 22.

[0125] Embodiment 4:

[0126] Based on Example 2, the reverse circulation method comprises the following steps:

[0127] Step 21, filling the liquid container 10 with the working fluid required for the reverse circulation experiment, which may be water;

[0128] Step 22, determining the injection flow rate value, the backflow pressure value and the preset heating temperature range of each electric heating wire 4 for the corresponding simulated wellbore section;

[0129] Step 23, turning on the heating power regulator 20, adjusting the output power of the heating power regulator 20 to each electric heating wire 4, and monitoring the temperature change of each simulated formation temperature tester 21 in real time; when the temperature value tested by each simulated formation temperature tester 21 reaches the preset heating temperature of the corresponding simulated wellbore section, the output power of the heating power regulator 20 to each electric heating wire 4 remains unchanged;

[0130] Close the injection control valve 11 on the positive circulation injection branch pipe 5 and the backflow control valve 14 on the positive circulation backflow branch pipe 8, adjust the opening of the backflow control valve 14 on the backflow branch pipe 6 and the injection control valve 11 on the backflow injection branch pipe 7, start the injection pump 9, make the data of the injection flow meter 15 on the backflow injection branch pipe 7 reach the injection flow value, and the data of the backflow pressure sensor 17 on the backflow branch pipe 6 reach the backflow pressure value, and the working medium injected into the liquid container 10 is injected downwardly through the backflow injection branch pipe 7 and the annulus 3, and then output upward from the end of the annulus 3 through the inner pipe 2, and then return to the injection liquid container 10 through the backflow branch pipe 6 and the cooling pipeline 13, so as to realize the reverse circulation of the working medium;

[0131] In this process, the temperature changes of each simulated formation temperature tester 21 are monitored in real time. When the temperature values ​​tested by each simulated formation temperature tester 21 fluctuate within the corresponding error range and tend to be stable, the experimental debugging is completed;

[0132] After the experimental debugging is completed, the test data of the injection temperature sensor 16, the injection pressure sensor 19 on the reverse circulation injection branch pipe 7, the reverse flow pressure sensor 17, the reverse flow temperature sensor 18 on the reverse circulation reverse flow branch pipe 6, and each simulated formation temperature tester 21 and the bottom hole annulus temperature tester 22 are recorded;

[0133] Step 24, changing the opening value of the reverse flow control valve 14 on the reverse circulation reverse flow branch pipe 6 for multiple times, and conducting an experiment on the influence of the reverse flow pressure on the heat conduction and heat transfer characteristics;

[0134] For each reverse circulation reverse flow branch pipe 6, the opening value of the reverse flow control valve 14 is:

[0135] When the temperature values ​​tested by each simulated formation temperature tester 21 fluctuate within the corresponding error range to tend to be stable, record the test data of the injection temperature sensor 16, the injection pressure sensor 19 on the reverse circulation injection branch pipe 7, the reverse flow pressure sensor 17, the reverse flow temperature sensor 18 on the reverse circulation reverse flow branch pipe 6, and each simulated formation temperature tester 21 and the bottom hole annulus temperature tester 22;

[0136] Step 25, perform the experimental debugging in step 23, then adjust the opening of the injection control valve 11 on the reverse circulation injection branch pipe 7 for multiple times, obtain multiple test flow values ​​of the injection flow meter 15 on the reverse circulation injection branch pipe 7, and perform an experiment on the influence of the injection flow on the heat conduction and heat transfer characteristics;

[0137] For each reverse circulation injection branch pipe 7, the test flow value of the injection flow meter 15 is:

[0138] When the temperature values ​​tested by each simulated formation temperature tester 21 fluctuate within the corresponding error range to tend to be stable, record the test data of the injection temperature sensor 16, the injection pressure sensor 19 on the reverse circulation injection branch pipe 7, the reverse flow pressure sensor 17, the reverse flow temperature sensor 18 on the reverse circulation reverse flow branch pipe 6, and each simulated formation temperature tester 21 and the bottom hole annulus temperature tester 22;

[0139] Step 26, perform the experimental debugging in step 23, then adjust the output power of the heating power regulator 20 to each electric heating line 4 for multiple times, obtain multiple groups of simulated formation temperature values, and conduct an experiment on the influence of formation temperature on heat conduction and heat transfer characteristics;

[0140] For each group, the output power of the heating power regulator 20 to each electric heating wire 4 is adjusted:

[0141] When the temperature values ​​tested by each simulated formation temperature tester 21 fluctuate within the corresponding error range and tend to be stable, record the test data of the injection temperature sensor 16, injection pressure sensor 19 on the reverse circulation injection branch 7, the reverse flow pressure sensor 17, reverse flow temperature sensor 18 on the reverse circulation reverse flow branch 6, and each simulated formation temperature tester 21 and the bottom hole annulus temperature tester 22.

[0142] Embodiment 5:

[0143] On the basis of Example 2, a pressure generator 24 is provided on the positive circulation reverse flow branch pipe 8 .

[0144] Preferably, the third well section is a heat conducting pipe, and a heat insulating sleeve is coaxially sleeved on the outer wall of the first well section, the second well section and the inner pipe 2. The electric heating wire 4 and the simulated formation temperature tester 21 are arranged on the corresponding heat insulating sleeves.

[0145] Preferably, an atomizing nozzle 23 is provided at the end of the inner tube 2 away from the wellhead.

[0146] Preferably, Figure 2-Figure 4 As shown, the atomizing nozzle 23 comprises a shell 231 coaxially fixedly arranged at the end of the inner tube, and a nozzle 232 is fixedly arranged at one end of the shell 231 away from the inner tube 2;

[0147] A swirl mechanism is rotatably arranged inside the shell 231, and the swirl mechanism includes a central shaft 233, on which spirally wound swirl blades 234 are arranged, and a bearing 235 is arranged at one end of the central shaft 233 away from the nozzle 232, and the outer ring of the bearing 235 is fixedly connected to the radial inner side of a support member 236, and the radial outer side of the support member 236 is fixedly connected to the shell 231, and the support member 236 is provided with a through hole 237 for fluid to pass through.

[0148] The fluid falling from the inner tube 2 drives the swirl mechanism to rotate at high speed under the action of gravitational potential energy and kinetic energy. Under the action of rotation, the liquid is atomized and sprayed out through the nozzle 232.

[0149] Preferably, the gas-based energy recovery method comprises the following steps:

[0150] Step 31, filling the liquid injection container 10 with the working fluid required for the gas-based energy extraction experiment, which may be an organic working fluid such as methanol, acetone, isohexane, pentane, etc.;

[0151] Step 32, determining the injection flow rate value, the backflow pressure value and the preset heating temperature range of each electric heating wire 4 for the corresponding simulated wellbore section;

[0152] Step 33, turn on the heating power regulator 20, adjust the output power of the heating power regulator 20 to each electric heating wire 4, and monitor the temperature change of each simulated formation temperature tester 21 in real time; when the temperature value tested by each simulated formation temperature tester 21 reaches the preset heating temperature of the corresponding simulated wellbore section, the output power of the heating power regulator 20 to each electric heating wire 4 remains unchanged;

[0153] Close the injection control valve 11 on the reverse circulation injection branch pipe 7 and the reverse flow control valve 14 on the reverse circulation reverse flow branch pipe 6, adjust the opening of the reverse flow control valve 14 on the positive circulation reverse flow branch pipe 8 and the injection control valve 11 on the positive circulation injection branch pipe 5, start the injection pump 9, make the data of the injection flow meter 15 on the positive circulation injection branch pipe 5 reach the injection flow value, and the data of the reverse flow pressure sensor 17 on the positive circulation reverse flow branch pipe 8 reach the reverse flow pressure value, the working medium injected into the liquid container 10 is injected downward through the positive circulation injection branch pipe 5 and the inner pipe 2, and then atomized and sprayed out by the atomizing nozzle 23 at the end of the inner pipe 2, the atomized working medium is vaporized in the annulus 3, output upward along the annulus 3 in the form of gas, and then enters the pressure generator 24 through the positive circulation reverse flow branch pipe 8 to generate electricity, realizing the conversion from thermal energy to mechanical energy and then to electrical energy, the gas after pressure release enters the cooling pipeline 13, cools down to become liquid, and flows back to the injection liquid container 10, realizing the working medium circulation;

[0154] In this process, the temperature changes of each simulated formation temperature tester 21 are monitored in real time. When the temperature values ​​tested by each simulated formation temperature tester 21 fluctuate within the corresponding error range and tend to be stable, the experimental debugging is completed;

[0155] After the experimental debugging is completed, the test data of the injection temperature sensor 16, the injection pressure sensor 19 on the positive circulation injection branch pipe 5, the reverse flow pressure sensor 17, the reverse flow temperature sensor 18, the pressure generator 24, and each simulated formation temperature tester 21 and the bottom hole annulus temperature tester 22 are recorded;

[0156] Step 34, changing the opening value of the backflow control valve 14 on the forward circulation backflow branch 8 for multiple times to conduct an experiment on the effect of the backflow pressure on the heat conduction and heat transfer characteristics;

[0157] For each positive cycle reverse flow branch pipe 8, the opening value of the reverse flow control valve 14 is:

[0158] When the temperature values ​​tested by each simulated formation temperature tester 21 fluctuate within the corresponding error range to tend to be stable, record the test data of the injection temperature sensor 16, injection pressure sensor 19 on the positive circulation injection branch pipe 5, the reverse flow pressure sensor 17, reverse flow temperature sensor 18, pressure generator 24 on the positive circulation reverse flow branch pipe 8, and each simulated formation temperature tester 21 and the bottom hole annulus temperature tester 22;

[0159] Step 35, perform the experimental debugging in step 33, then adjust the opening of the injection control valve 11 on the positive circulation injection branch pipe 5 for multiple times, obtain multiple test flow values ​​of the injection flow meter 15 on the positive circulation injection branch pipe 5, and perform an experiment on the influence of the injection flow on the heat conduction and heat transfer characteristics;

[0160] For each positive circulation injection branch pipe 5, the test flow value of the injection flow meter 15 is:

[0161] When the temperature values ​​tested by each simulated formation temperature tester 21 fluctuate within the corresponding error range to tend to be stable, record the test data of the injection temperature sensor 16, injection pressure sensor 19 on the positive circulation injection branch pipe 5, the reverse flow pressure sensor 17, reverse flow temperature sensor 18, pressure generator 24 on the positive circulation reverse flow branch pipe 8, and each simulated formation temperature tester 21 and the bottom hole annulus temperature tester 22;

[0162] Step 36, perform the experimental debugging in step 33, then adjust the output power of the heating power regulator 20 to each electric heating line 4 for multiple times, obtain multiple groups of simulated formation temperature values, and conduct an experiment on the influence of formation temperature on heat conduction and heat transfer characteristics;

[0163] For each group, the output power of the heating power regulator 20 to each electric heating wire 4 is adjusted:

[0164] When the temperature values ​​tested by each simulated formation temperature tester 21 fluctuate within the corresponding error range and tend to be stable, record the test data of the injection temperature sensor 16, injection pressure sensor 19 on the positive circulation injection branch 5, the reverse flow pressure sensor 17, reverse flow temperature sensor 18, pressure generator 24 on the positive circulation reverse flow branch 8, and each simulated formation temperature tester 21 and the bottom hole annulus temperature tester 22.

[0165] In the heat conduction and heat transfer experimental device for the deep geological energy drilling and production process of the present invention, the injection temperature sensor 16, the backflow temperature sensor 18, and the bottom hole annulus temperature tester 22 are set to realize the test of the temperature change before and after the heat transfer between the fluid in the wellbore and the simulated formation; in the present application, the heating part includes a plurality of sections of electric heating wires 4 arranged in sequence along the axial direction of the simulated wellbore 1, and the heating power regulator 20 controls the heating power of each electric heating wire 4. By heating the simulated wellbore 1 in sections, the simulation of the formation temperature is realized, and the simulated wellbore sections are each provided with a simulated formation temperature tester 21, which can monitor the temperature change of each section in real time, so as to obtain the temperature change of the simulated formation before and after the heat exchange with the fluid in the simulated wellbore 1 through the experiment, that is, the experimental data of the temperature change of the fluid in the wellbore and the formation outside the wellbore used to study the heat conduction and heat transfer characteristics inside and outside the wellbore during the drilling and production process can be obtained, so as to provide data support for optimizing the deep geological energy drilling and production technology.

[0166] Although the above describes the specific implementation mode of the present invention in conjunction with the accompanying drawings, it is not a limitation of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without creative work are still within the protection scope of the present invention.

Claims

1. Experimental device for heat conduction and heat transfer inside and outside the wellbore during deep geological energy drilling and production, characterized by: It includes a simulated wellbore, wherein the outside of the simulated wellbore is provided with a heating part for simulating the formation temperature; An inner tube is arranged inside the simulated wellbore, an annulus is formed between the inner tube and the simulated wellbore, the top of the annulus is blocked, and the bottom of the annulus is connected to the inner tube; The upper end of the inner tube is connected to the positive circulation injection branch pipe, and the upper end of the inner tube is connected to the reverse circulation reflux branch pipe; The upper end of the annulus is connected to the reverse circulation injection branch pipe, and the upper end of the annulus is connected to the forward circulation reverse flow branch pipe; The positive circulation injection branch pipe and the reverse circulation injection branch pipe are both connected to the output end of the injection pump, and the input end of the injection pump is connected to the injection liquid container; the positive circulation injection branch pipe and the reverse circulation injection branch pipe are both provided with an injection control valve, an injection flow meter, an injection temperature sensor, and an injection pressure sensor; The positive circulation reflux branch pipe and the reverse circulation reflux branch pipe are both connected to a cooling pipeline in the cooling box, and the other end of the cooling pipeline is connected to the injection liquid container; the positive circulation reflux branch pipe and the reverse circulation reflux branch pipe are both provided with a reflux control valve, a reflux pressure sensor, and a reflux temperature sensor; A bottom hole annulus temperature tester is arranged at the end of the annulus away from the wellhead.

2. The heat conduction and heat transfer experimental device for deep geological energy drilling and production as claimed in claim 1 is characterized in that: The heating part comprises a plurality of electric heating wires arranged in sequence along the axial direction of the simulated wellbore, and the electric heating wires are wound around the outside of the simulated wellbore; The electric heating wire is electrically connected to the heating power regulator; A simulated formation temperature tester for detecting temperature is arranged on the simulated wellbore wall around which each electric heating wire is wound.

3. The heat conduction and heat transfer experimental device for deep geological energy drilling and production as claimed in claim 2 is characterized in that: The simulated wellbore includes a first well section extending in a vertical direction, a third well section extending in a horizontal direction, and a second well section connecting the first well section and the third well section.

4. A heat conduction and heat transfer experimental method for deep geological energy drilling and production, which is implemented based on the heat conduction and heat transfer experimental device for deep geological energy drilling and production as claimed in claim 3, and is characterized in that: Including positive circulation method, reverse circulation method, and gas-based energy recovery method; In the positive circulation method, the working fluid is injected downward along the inner tube and discharged upward along the annulus; In the reverse circulation method, the working fluid is injected downward along the annulus and discharged upward along the inner tube; In the gas-based energy recovery method, the working fluid is injected downward along the inner tube in the form of liquid and output upward along the annulus in the form of gas.

5. The heat conduction and heat transfer experimental method inside and outside the wellbore during deep geological energy drilling and production as claimed in claim 4 is characterized in that: The positive cycle method comprises the following steps: Step 11, filling the liquid injection container with the working fluid required for the positive cycle experiment; Step 12, determining the injection flow rate value, the backflow pressure value and the preset heating temperature of each electric heating wire for the corresponding simulated wellbore section; Step 13, turning on the heating power regulator, adjusting the output power of the heating power regulator to each electric heating wire, and monitoring the temperature change of each simulated formation temperature tester in real time; when the temperature value tested by each simulated formation temperature tester reaches the preset heating temperature of the corresponding simulated wellbore section, the output power of the heating power regulator to each electric heating wire remains unchanged; Close the injection control valve on the reverse circulation injection branch and the backflow control valve on the reverse circulation backflow branch, adjust the opening of the backflow control valve on the positive circulation backflow branch and the injection control valve on the positive circulation injection branch, start the injection pump, make the data of the injection flow meter on the positive circulation injection branch reach the injection flow value, and the data of the backflow pressure sensor on the positive circulation backflow branch reach the backflow pressure value, the working fluid injected into the liquid container is injected downwardly through the positive circulation injection branch and the inner pipe, and then output upwardly from the end of the inner pipe through the annulus, and then return to the injection liquid container through the positive circulation backflow branch and the cooling pipeline, so as to realize the positive circulation of the working fluid; In this process, the temperature changes of each simulated formation temperature tester are monitored in real time. When the temperature values ​​tested by each simulated formation temperature tester fluctuate within the corresponding error range and tend to be stable, the experimental debugging is completed; After the experimental debugging is completed, the test data of the injection temperature sensor and injection pressure sensor on the positive circulation injection branch pipe, the reverse flow pressure sensor and reverse flow temperature sensor on the positive circulation reverse flow branch pipe, and each simulated formation temperature tester and the bottom hole annulus temperature tester 22 are recorded; Step 14, changing the opening value of the backflow control valve on the forward circulation backflow branch pipe multiple times to conduct an experiment on the influence of the backflow pressure on the heat conduction and heat transfer characteristics; For each positive cycle reverse flow branch, the opening value of the reverse flow control valve is: When the temperature values ​​tested by each simulated formation temperature tester fluctuate within the corresponding error range and tend to be stable, record the test data of the injection temperature sensor and injection pressure sensor on the positive circulation injection branch pipe, the reverse flow pressure sensor and reverse flow temperature sensor on the positive circulation reverse flow branch pipe, and each simulated formation temperature tester and the bottom hole annulus temperature tester; Step 15, perform the experimental debugging in step 13, then adjust the opening of the injection control valve on the positive circulation injection branch pipe for multiple times, obtain multiple test flow values ​​of the injection flow meter on the positive circulation injection branch pipe, and perform an experiment on the influence of the injection flow on the heat conduction and heat transfer characteristics; For each positive circulation injection branch pipe, the test flow value of the injection flow meter is: When the temperature values ​​tested by each simulated formation temperature tester fluctuate within the corresponding error range and tend to be stable, record the test data of the injection temperature sensor and injection pressure sensor on the positive circulation injection branch pipe, the reverse flow pressure sensor and reverse flow temperature sensor on the positive circulation reverse flow branch pipe, and each simulated formation temperature tester and the bottom hole annulus temperature tester; Step 16, perform the experimental debugging in step 13, then adjust the output power of the heating power regulator to each electric heating line for multiple times, obtain multiple groups of simulated formation temperature values, and conduct an experiment on the influence of formation temperature on heat conduction and heat transfer characteristics; For each group, adjust the output power of the heating power controller to each electric heating line: When the temperature values ​​tested by each simulated formation temperature tester fluctuate within the corresponding error range and tend to be stable, record the test data of the injection temperature sensor, injection pressure sensor on the positive circulation injection branch, the backflow pressure sensor, backflow temperature sensor on the positive circulation backflow branch, each simulated formation temperature tester and the bottom hole annulus temperature tester.

6. The heat conduction and heat transfer experimental method for deep geological energy drilling and production as claimed in claim 4 is characterized in that: The reverse circulation method comprises the following steps: Step 21, filling the liquid injection container with the working fluid required for the reverse circulation experiment; Step 22, determining the injection flow rate value, the backflow pressure value and the preset heating temperature of each electric heating wire for the corresponding simulated wellbore section; Step 23, turning on the heating power regulator, adjusting the output power of the heating power regulator to each electric heating wire, and monitoring the temperature change of each simulated formation temperature tester in real time; when the temperature value tested by each simulated formation temperature tester reaches the preset heating temperature of the corresponding simulated wellbore section, the output power of the heating power regulator to each electric heating wire remains unchanged; Close the injection control valve on the positive circulation injection branch and the backflow control valve on the positive circulation backflow branch, adjust the opening of the backflow control valve on the reverse circulation backflow branch and the injection control valve on the reverse circulation injection branch, start the injection pump, make the data of the injection flow meter on the reverse circulation injection branch reach the injection flow value, and the data of the backflow pressure sensor on the reverse circulation backflow branch reach the backflow pressure value, the working fluid injected into the liquid container is injected downward through the reverse circulation injection branch and the annulus, and then output upward from the end of the annulus through the inner pipe, and then return to the injection liquid container through the reverse circulation backflow branch and the cooling pipeline, so as to realize the reverse circulation of the working fluid; In this process, the temperature changes of each simulated formation temperature tester are monitored in real time. When the temperature values ​​tested by each simulated formation temperature tester fluctuate within the corresponding error range and tend to be stable, the experimental debugging is completed; After the experimental debugging is completed, the test data of the injection temperature sensor, injection pressure sensor on the reverse circulation injection branch pipe, the reverse flow pressure sensor, reverse flow temperature sensor on the reverse circulation reverse flow branch pipe, and each simulated formation temperature tester and the bottom hole annulus temperature tester are recorded; Step 24, changing the opening value of the reverse flow control valve on the reverse circulation reverse flow branch pipe for multiple times to conduct an experiment on the influence of the reverse flow pressure on the heat conduction and heat transfer characteristics; For each reverse circulation reverse flow branch, the opening value of the reverse flow control valve is: When the temperature values ​​tested by each simulated formation temperature tester fluctuate within the corresponding error range and tend to be stable, record the test data of the injection temperature sensor, injection pressure sensor on the reverse circulation injection branch pipe, the reverse flow pressure sensor, reverse flow temperature sensor on the reverse circulation reverse flow branch pipe, each simulated formation temperature tester and the bottom hole annulus temperature tester; Step 25, performing the experimental debugging in step 23, and then adjusting the opening of the injection control valve on the reverse circulation injection branch pipe for multiple times, obtaining multiple test flow values ​​of the injection flow meter on the reverse circulation injection branch pipe, and performing an experiment on the effect of the injection flow on the heat conduction and heat transfer characteristics; For each reverse circulation injection branch pipe, the test flow value of the injection flow meter is: When the temperature values ​​tested by each simulated formation temperature tester fluctuate within the corresponding error range and tend to be stable, record the test data of the injection temperature sensor, injection pressure sensor on the reverse circulation injection branch pipe, the reverse flow pressure sensor, reverse flow temperature sensor on the reverse circulation reverse flow branch pipe, each simulated formation temperature tester and the bottom hole annulus temperature tester; Step 26, perform the experimental debugging in step 23, then adjust the output power of the heating power regulator to each electric heating line for multiple times, obtain multiple groups of simulated formation temperature values, and conduct an experiment on the influence of formation temperature on heat conduction and heat transfer characteristics; For each group, adjust the output power of the heating power controller to each electric heating line: When the temperature values ​​tested by each simulated formation temperature tester fluctuate within the corresponding error range and tend to be stable, record the test data of the injection temperature sensor, injection pressure sensor on the reverse circulation injection branch, the reverse flow pressure sensor, reverse flow temperature sensor on the reverse circulation reverse flow branch, each simulated formation temperature tester and the bottom hole annulus temperature tester.

7. The heat conduction and heat transfer experimental method for deep geological energy drilling and production as claimed in claim 4 is characterized in that: The positive circulation reverse flow branch pipe is provided with a pressure generator.

8. The heat conduction and heat transfer experimental method for deep geological energy drilling and production as claimed in claim 7 is characterized in that: The third well section is a heat-conducting pipe, and a heat-insulating sleeve is coaxially sleeved on the outer wall of the first well section, the second well section and the inner pipe.

9. The heat conduction and heat transfer experimental method for deep geological energy drilling and production as claimed in claim 8, characterized in that: The end of the inner tube away from the wellhead is provided with an atomizing nozzle; The atomizing nozzle comprises a shell coaxially fixedly arranged at the end of the inner tube, and a nozzle is fixedly arranged at one end of the shell away from the inner tube; A swirl mechanism is rotatably arranged in the shell, and the swirl mechanism includes a central axis, on which spirally wound swirl blades are arranged, and a bearing is arranged at one end of the central axis away from the nozzle, and the outer ring of the bearing is fixedly connected to the radial inner side of the support member, and the radial outer side of the support member is fixedly connected to the shell, and the support member is provided with a through hole for fluid to pass through.

10. The heat conduction and heat transfer experimental method inside and outside the wellbore during deep geological energy drilling and production as claimed in claim 9, characterized in that: The method for recovering energy by gas comprises the following steps: Step 31, filling the liquid injection container with the working fluid required for the gas-based energy extraction experiment; Step 32, determining the injection flow rate value, the backflow pressure value and the preset heating temperature of each electric heating wire for the corresponding simulated wellbore section; Step 33, turn on the heating power regulator, adjust the output power of the heating power regulator to each electric heating wire, and monitor the temperature change of each simulated formation temperature tester in real time; when the temperature value tested by each simulated formation temperature tester reaches the preset heating temperature of the corresponding simulated wellbore section, the output power of the heating power regulator to each electric heating wire remains unchanged; Close the injection control valve on the reverse circulation injection branch and the backflow control valve on the reverse circulation backflow branch, adjust the opening of the backflow control valve on the positive circulation backflow branch and the injection control valve on the positive circulation injection branch, start the injection pump, make the data of the injection flow meter on the positive circulation injection branch reach the injection flow value, and the data of the backflow pressure sensor on the positive circulation backflow branch reach the backflow pressure value, the working fluid injected into the liquid container is injected downward through the positive circulation injection branch and the inner tube, and then atomized and sprayed out by the atomizing nozzle at the end of the inner tube, the atomized working fluid is vaporized in the annulus, output upward along the annulus in the form of gas, and then enters the pressure generator through the positive circulation backflow branch to generate electricity, realizing the conversion from thermal energy to mechanical energy and then to electrical energy, the gas after pressure release enters the cooling pipeline, cools down and becomes liquid, and flows back to the injection liquid container, realizing the working fluid circulation; In this process, the temperature changes of each simulated formation temperature tester are monitored in real time. When the temperature values ​​tested by each simulated formation temperature tester fluctuate within the corresponding error range and tend to be stable, the experimental debugging is completed; After the experimental debugging is completed, the test data of the injection temperature sensor, injection pressure sensor on the positive circulation injection branch, the reverse flow pressure sensor, reverse flow temperature sensor, pressure generator, various simulated formation temperature testers and bottom hole annulus temperature tester are recorded; Step 34, changing the opening value of the backflow control valve on the forward circulation backflow branch pipe multiple times to conduct an experiment on the influence of the backflow pressure on the heat conduction and heat transfer characteristics; For each positive cycle reverse flow branch, the opening value of the reverse flow control valve is: When the temperature values ​​tested by each simulated formation temperature tester fluctuate within the corresponding error range and tend to be stable, record the test data of the injection temperature sensor, injection pressure sensor on the positive circulation injection branch pipe, the reverse flow pressure sensor, reverse flow temperature sensor, pressure generator on the positive circulation reverse flow branch pipe, and each simulated formation temperature tester and the bottom hole annulus temperature tester; Step 35, perform the experimental debugging in step 33, then adjust the opening of the injection control valve on the positive circulation injection branch pipe for multiple times, obtain multiple test flow values ​​of the injection flow meter on the positive circulation injection branch pipe, and perform an experiment on the influence of the injection flow on the heat conduction and heat transfer characteristics; For each positive circulation injection branch pipe, the test flow value of the injection flow meter is: When the temperature values ​​tested by each simulated formation temperature tester fluctuate within the corresponding error range and tend to be stable, record the test data of the injection temperature sensor, injection pressure sensor on the positive circulation injection branch pipe, the reverse flow pressure sensor, reverse flow temperature sensor, pressure generator on the positive circulation reverse flow branch pipe, and each simulated formation temperature tester and the bottom hole annulus temperature tester; Step 36, perform the experimental debugging in step 33, then adjust the output power of the heating power regulator to each electric heating line for multiple times, obtain multiple groups of simulated formation temperature values, and conduct an experiment on the influence of formation temperature on heat conduction and heat transfer characteristics; For each group, adjust the output power of the heating power controller to each electric heating line: When the temperature values ​​tested by each simulated formation temperature tester fluctuate within the corresponding error range and tend to be stable, record the test data of the injection temperature sensor, injection pressure sensor on the positive circulation injection branch, the reverse flow pressure sensor, reverse flow temperature sensor, pressure generator on the positive circulation reverse flow branch, and each simulated formation temperature tester and the bottom hole annulus temperature tester.

Images