A deep hole field thermal response tester

Abstract

The present invention relates to the technical field of geothermal well thermal response testing equipment, and specifically discloses a deep hole field thermal response tester, including a thermal property testing device and a heat exchange device, the heat exchange device including a mounting seat, an inlet pipe, a return pipe, a communicating vessel, a reducer and a support pipe, the mounting seat is erected at the wellhead of the geothermal well, one end of the inlet pipe and the return pipe are sealed and placed in the geothermal well, the other ends of the inlet pipe and the return pipe extend out of the geothermal well and are connected to the thermal property testing device; a plurality of communicating vessels are arranged at intervals between the inlet pipe and the return pipe in the geothermal well, and the communicating vessels are respectively connected to the inlet pipe and the return pipe; adjacent communicating vessels are connected to each other by a support pipe, and the communicating vessel at the top is connected to the mounting seat by a support pipe; the problem that the buried heat exchanger tube used in traditional measurement is relatively fixed at the depth of the geothermal well, making it difficult to measure at different well depths, the collected data is single, and it is difficult to efficiently perform segmented testing on medium-deep or even ultra-deep geothermal wells is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of geothermal well thermal response testing equipment, in particular to a deep hole field thermal response tester. Background Art

[0002] The "Technical Specification for Geothermal Heat Pump System Engineering" (GB50366-2009) clearly stipulates that prior to designing a geothermal heat pump system, a geotechnical thermal response test should be conducted on the project site. This field thermal response test involves continuously heating (cooling) the geotechnical mass using an artificial cold (hot) source through a buried heat exchange system, while recording the temperature changes and circulation volume of the heat transfer medium to determine the thermal conductivity of the geotechnical mass. This field test determines the initial geotechnical temperature and relevant calculation parameters under stable heat flow and operating conditions. Professional analysis software is then used to calculate the effective thermal conductivity of the geotechnical mass within the buried heat exchanger's depth range, as well as the heat transfer capacity per meter of buried pipe. This provides a scientific, accurate, and reliable basis for the design of geotechnical underground heat exchange systems, thereby supporting the rational design of the entire system.

[0003] Geothermal wells can be divided into shallow geothermal wells, medium-deep geothermal wells and deep geothermal wells (ultra-deep geothermal wells) according to their depths. Due to the different soil properties of each layer of rock and soil, the thermal conductivity and specific heat capacity are also different. For engineering design, the most important concern is the comprehensive geothermal thermal conductivity within the depth range of the buried pipe heat exchanger. This parameter can better reflect the heat exchange capacity of the buried pipe heat exchange system. Generally, the deeper the geothermal well, the greater the heat. Geothermal wells not only pump in room temperature water to heat it through the geothermal well and pump out hot water for heating, but also pump in hot water to cool it through the low temperature section of the geothermal well and then pump out cold water for heat storage or production. Cold, and then in order to measure the low-temperature section at an appropriate depth, the buried heat exchanger tubes (usually U-shaped tubes or double U-shaped tubes) used in existing measurements are directly placed at the bottom of the well. The depth in the geothermal well is relatively fixed, and it is impossible to measure at different depths. Especially when testing medium-deep or even ultra-deep geothermal wells, to collect data at different depths, it is necessary to control the buried heat exchanger through suspension equipment to collect data at different depths. Due to the deep well, higher requirements are placed on the strength of the suspension equipment and the pipes used in the test. As a result, existing testing equipment is difficult to efficiently perform segmented testing on medium-deep or even ultra-deep geothermal wells. Summary of the Invention

[0004] The purpose of the present invention is to provide a deep hole field thermal response tester, which solves the problems that the buried heat exchanger tubes used in traditional measurements are relatively fixed in the depth of the geothermal well, making it difficult to measure at different well depths, and the collected data is single. Especially when measuring deep wells and ultra-deep wells, the structural strength requirements of the test device are high, and the existing test equipment is difficult to efficiently perform segmented testing on medium-depth and even ultra-deep geothermal wells.

[0005] The present invention is achieved through the following technical solutions: a deep hole field thermal response test instrument, comprising a thermal property testing device and a heat exchange device, wherein the heat exchange device comprises a mounting base, a water inlet pipe, a water return pipe, a communicating vessel, a reducer, and a support pipe; the mounting base is mounted at the wellhead of a geothermal well; one end of the water inlet pipe and the water return pipe are sealed and placed in the geothermal well; the other ends of the water inlet pipe and the water return pipe extend out of the geothermal well and are connected to the thermal property testing device;

[0006] A plurality of communicating vessels are provided at intervals in the portion of the water inlet pipe and the water return pipe located in the geothermal well, and the communicating vessels are respectively connected to the water inlet pipe and the water return pipe; adjacent communicating vessels are connected to each other via the support pipe, and the communicating vessel located at the top is connected to the mounting seat via the support pipe;

[0007] The communicating vessel comprises a housing, a valve body and a valve stem. The valve body is arranged in the housing. A water flow chamber and a valve chamber are provided in the valve body and are mutually intersecting and connected. The two ends of the water flow chamber are respectively connected to the water inlet pipe and the water return pipe. The valve stem is slidably arranged in the valve chamber. A valve hole is radially penetrated on the valve stem. The valve stem is controlled to move up and down in the valve chamber so as to connect the valve hole with the water flow chamber, thereby connecting the water inlet pipe and the water return pipe.

[0008] A drive tube is coaxially arranged in the support tube, and the drive tube at the top is transmission-connected to the output end of the reducer; the upper end of the valve stem extends into the drive tube at the top of the communicating vessel and is spline-connected thereto; an external threaded section is provided on the valve stem, and an internal threaded section is provided at the lower end of the valve cavity; the external threaded section is engaged with the internal threaded section, and the valve stem is driven to rotate by the drive tube at the top of the communicating vessel, thereby moving the valve stem downward as a whole; when the external threaded section is separated from the internal threaded section, the valve hole is located below the water flow cavity and the lower end of the valve stem is transmission-connected to the drive tube at the bottom of the communicating vessel.

[0009] Furthermore, the inner cavity of the driving tube between adjacent communicating vessels includes a sliding cavity and a first spline cavity distributed upper and lower, a first end face tooth is provided in the sliding cavity, and a second end face tooth is provided at the lower end of the valve stem. When the valve stem is rotated until the external thread section and the internal thread section are separated, the second end face tooth engages with the first end face tooth.

[0010] Furthermore, the water inlet pipe includes a plurality of first water pipes and a first connecting pipe, and the first connecting pipes are provided between adjacent first water pipes; the water return pipe includes a plurality of second water pipes and a second connecting pipe, and the second connecting pipes are provided between adjacent second water pipes;

[0011] The first connecting pipe and the second connecting pipe are symmetrically arranged on the left and right sides of the housing, and the first connecting pipe and the second connecting pipe are both slidably connected to the housing through a telescopic mechanism;

[0012] The telescopic mechanism includes a screw, a spiral sleeve and a sliding tube, a sliding cavity is coaxially opened in the screw, one end of the sliding cavity is communicated with the first connecting tube or the second connecting tube, two sliding tubes are connected to the two ends of the water flow cavity respectively, and one end of the sliding tube away from the valve body is slidably placed in the sliding cavity; the spiral sleeve is rotatably arranged on the housing, the screw passes through the spiral sleeve and is threadedly matched with the spiral sleeve, and the spiral sleeve is transmission-connected to the valve stem;

[0013] The telescopic mechanism also includes a guide seat and several guide rods. The guide seats are provided on the top and bottom of the shell, and several guide cavities are provided at intervals on the guide seat; several guide rods are provided on the first connecting tube, and one end of the guide rod slides out of the guide cavity; the guide rod is arranged parallel to the screw.

[0014] Furthermore, the portion of the spiral sleeve located inside the shell is sleeved with a driven bevel gear, and the portion of the valve stem located between the top of the valve body and the shell is slidingly sleeved with a driving bevel gear, the driving bevel gear is transmission-connected to the valve stem, and the driving bevel gear is meshed with the driven bevel gear.

[0015] Furthermore, the upper end of the valve stem is provided with a first external spline, the first external spline cooperates with the first spline cavity, the portion between the first external spline and the valve hole is provided with a second external spline, and the first external spline and the second external spline are spaced apart;

[0016] A second spline cavity is formed in the inner cavity of the active bevel gear, and the second external spline cooperates with the second spline cavity. When the valve stem rotates downward in the valve cavity until the valve hole is connected with the water flow cavity, the two screws move outward to the farthest end. At the same time, the second external spline is separated from the second spline cavity and is connected to the active bevel gear through a ratchet mechanism.

[0017] Furthermore, the ratchet mechanism includes a drive seat, a ratchet ring, and a plurality of pawls. The drive seat is slidably sleeved on the valve stem. A third spline cavity is provided in the inner cavity of the drive seat. When the valve stem continues to move downward to the lowermost end after the valve hole is connected with the water flow cavity, the second external spline always cooperates with the third spline cavity.

[0018] The ratchet ring is sleeved on the valve stem and is loosely fitted with the valve stem. The ratchet ring is coaxially fixedly connected to the active bevel gear. A plurality of ratchet teeth are provided in an annular array in the inner cavity of the ratchet ring. A plurality of pawls are provided in an annular array on the drive seat. The drive seat is coaxially placed in the ratchet ring and is loosely fitted with the ratchet ring. The pawl is hinged to the drive seat and meshes with the ratchet teeth via a torsion spring.

[0019] When the valve stem rotates in the reverse direction, the second external spline is in driving connection with the driving bevel gear.

[0020] Furthermore, a plurality of first cone spikes are provided on the ends of the first connecting tube and the second connecting tube that are away from each other.

[0021] Furthermore, the first connecting pipe and the second connecting pipe are respectively provided with a first auxiliary heat exchanger and a second auxiliary heat exchanger, and the first auxiliary heat exchanger and the second auxiliary heat exchanger have the same structure;

[0022] The first auxiliary heat exchanger includes an elastic metal plate, a support rod, a first pull rod and a second pull rod. The middle portion of the elastic metal plate is fixed to an end of the first connecting pipe away from the second connecting pipe. The support rods are vertically arranged on both the left and right ends of the elastic metal plate.

[0023] Two first pull rods are hinged on the support rod at intervals, and the end of the first pull rod away from the support rod is hinged to the shell or the guide seat; the two guide rods at both ends of the guide seat are both provided with extension rods inclined toward the outside of the shell, and the two ends of the second pull rod are respectively hinged to the extension rod and the first pull rod.

[0024] Furthermore, the first auxiliary heat exchanger further includes a clamping plate, the clamping plate is fixed to the first connecting pipe, the elastic metal plate is located between the clamping plate and the first connecting pipe; the first cone thorn is provided on the clamping plate;

[0025] A plurality of second cone spikes are arranged in an array on the plate surface of the elastic metal plate at a side away from the first connecting pipe.

[0026] Furthermore, the thermal property testing device includes a chassis, a data acquisition instrument, a circulating water pump, an electric heating water tank, a flow regulating valve, a flow sensor, a first temperature sensor and a second temperature sensor;

[0027] The circulating water pump and the electric heating water tank are both arranged in the chassis, the input end of the circulating water pump is connected to the electric heating water tank through a third water pipe, and the output end of the circulating water pump is connected to the water inlet pipe through a fourth water pipe;

[0028] The return water pipe is connected to the electric heating water tank through a fifth water pipe, and the fifth water pipe is provided with a first temperature sensor and a flow sensor;

[0029] The fourth water pipe is provided with a second temperature sensor and a flow regulating valve;

[0030] The first temperature sensor, the second temperature sensor and the flow sensor are all electrically connected to the data acquisition instrument.

[0031] The technical solution of the present invention has at least the following advantages and beneficial effects:

[0032] 1. Several communicating vessels are provided at intervals between the water inlet pipe and the return pipe in the geothermal well, and the communicating vessels are connected to the water inlet pipe and the return pipe respectively; adjacent communicating vessels are connected to each other through support pipes, and the communicating vessel at the top is connected to the mounting seat through the support pipe; the drive pipe is driven to rotate by the reducer, thereby driving the valve stem to rotate, and at the same time, the valve stem moves downward in the valve cavity through the engagement of the external thread section and the internal thread section, and then the valve stem as a whole rotates and moves downward. When the valve cavity rotates to be flush with the water flow cavity, the valve cavity is just coaxially connected to the water flow cavity, and the current depth can be tested. At the same time, the reducer needs to stop running to ensure that the valve cavity and the water flow cavity remain connected. After the current depth measurement is completed, the reducer continues to rotate, thereby causing the valve stem to continue Move downward until the valve cavity and the water flow cavity are misaligned, and at the same time the external thread section and the internal thread section are just separated. The inner cavity of the driving tube between adjacent communicating vessels includes a sliding cavity and a first spline cavity distributed up and down. The sliding cavity is provided with a first end face tooth, and the lower end of the valve stem is provided with a second end face tooth. When the valve stem rotates until the external thread section and the internal thread section are separated, the second end face tooth engages with the first end face tooth. At this time, the valve stem will not continue to move. The valve stem acts as an intermediate transmission member to drive the next driving tube to rotate, thereby realizing control of the valve body of the next communicating vessel. The control method is consistent with the control method of the first group of communicating vessels, and thus the on and off of several communicating vessels can be controlled in sequence from top to bottom, so that water circulates at different depths, and thus data at different depths of geothermal wells can be measured.

[0033] 2. As the spiral sleeve rotates, it drives the screw in linear motion, moving the first and second connecting pipes away from each other and into contact with the inner wall of the geothermal well. This facilitates contact between the first and second water pipes and the well wall, improving heat exchange efficiency. Simultaneously, each of the first and second connecting pipes is equipped with a plurality of first spikes at the end away from each other. When the first and second connecting pipes move away from each other, the first spikes on both pipes penetrate into the well wall, improving heat exchange efficiency while also securing them to the well wall and reducing the suspension pressure on the entire device.

[0034] 3. A second spline cavity is provided in the inner cavity of the active bevel gear, and the second external spline cooperates with the second spline cavity. When the valve stem rotates downward in the valve cavity until the valve hole and the water flow cavity are connected, the two screws move outward to the farthest end. At the same time, the second external spline separates from the second spline cavity and is connected to the active bevel gear through the ratchet mechanism. In specific implementation, in the initial state, the second external spline cooperates with the second spline cavity, and the valve stem is driven to rotate by the driving pipe, thereby driving the active bevel gear to rotate, thereby causing the first connecting pipe and the second connecting pipe to move outward synchronously until they move to the farthest end, at this time, they are closely abutted against the well wall, and the valve cavity and the water flow cavity are connected, the second external spline separates from the second spline cavity, and when the valve stem continues to move downward, it will not drive the active bevel gear to rotate. When the valve stem continues to move downward, the second external spline and the ratchet mechanism begin to cooperate, but will not drive the active bevel gear to rotate.

[0035] 4. After the communication vessels at all depths have been tested, if the entire heat exchanger needs to be removed, the reducer is reversed to drive all drive pipes and valve stems to rotate in the opposite direction. At this time, the valve stem drives the drive seat to rotate through the second external spline, and the drive seat drives the ratchet to rotate through the pawl, thereby driving the active bevel gear to reverse, and then the screw moves to one side of the shell, separating the first and second connecting pipes from the inner wall of the geothermal well, making it easier to remove the entire heat exchanger.

[0036] 5. As the first connecting pipe and the second connecting pipe move outward to the farthest end, the second pull rod in the first auxiliary heat exchanger and the second auxiliary heat exchanger pushes the first pull rod to flip outward as the extension rod and the guide rod move outward, thereby causing the two ends of the elastic metal plate to flip outward and abut against the well wall, which helps the first connecting pipe and the second connecting pipe to contact the well wall for heat exchange, and at the same time can assist in fixing the current communicating vessel to the well wall. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0038] Figure 1 A schematic structural diagram of a deep hole field thermal response tester provided by the present invention;

[0039] Figure 2 A schematic cross-sectional view of a communicating vessel in a deep hole field thermal response tester provided by the present invention;

[0040] Figure 3A schematic diagram of the top view of the connecting vessel in a deep hole field thermal response tester provided by the present invention;

[0041] Figure 4 This is a schematic diagram of the structure of the ratchet mechanism and the valve stem in the deep hole field thermal response tester provided by the present invention;

[0042] Icons: 1. Geothermal well, 2. Thermal property test device, 21. Chassis, 22. Data acquisition instrument, 23. Circulating water pump, 231. Third water pipe, 232. Fourth water pipe, 24. Electric heating water tank, 25. Flow regulating valve, 26. Flow sensor, 27. First temperature sensor, 28. Second temperature sensor, 29. Fifth water pipe, 3. Heat exchange device, 31. Mounting seat, 32. Water inlet pipe, 321. First water pipe, 322, first connecting pipe, 3221, first cone thorn, 33, return pipe, 331, second water pipe, 332, second connecting pipe, 34, communicating vessel, 341, shell, 342, valve body, 3421, water flow cavity, 3422, valve cavity, 3423, internal thread section, 343, valve stem, 3431, valve hole, 3432, external thread section, 3433, first external spline, 3434, second External spline, 344, second end face tooth, 35, reducer, 36, support tube, 37, drive tube, 371, sliding cavity, 372, first spline cavity, 373, first end face tooth, 38, telescopic mechanism, 381, screw, 382, ​​screw sleeve, 383, sliding tube, 384, guide seat, 3841, guide cavity, 385, guide rod, 386, driven bevel gear, 387, driving bevel gear, 3871, Second spline cavity, 388, ratchet mechanism, 3881, drive seat, 3882, ratchet ring, 3883, pawl, 3884, third spline cavity, 3885, ratchet, 39, first auxiliary heat exchanger, 391, elastic metal plate, 3911, second cone thorn, 392, support rod, 393, first pull rod, 394, second pull rod, 395, extension rod, 396, splint, 40, second auxiliary heat exchanger. DETAILED DESCRIPTION

[0043] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0044] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0045] Reference Figures 1 to 4 As shown, this embodiment provides a deep hole field thermal response test instrument, including a thermal property testing device 2 and a heat exchange device 3, the heat exchange device 3 includes a mounting base 31, an inlet pipe 32, a return pipe 33, a communication device 34, a reducer 35 and a support pipe 36, the mounting base 31 is erected at the wellhead of the geothermal well 1, one end of the inlet pipe 32 and the return pipe 33 are sealed and placed in the geothermal well 1, and the other end of the inlet pipe 32 and the return pipe 33 extends out of the geothermal well 1 and is connected to the thermal property testing device 2; a plurality of communication devices 34 are arranged at intervals between the inlet pipe 32 and the return pipe 33 located in the geothermal well 1, and the communication devices 34 are respectively connected to the inlet pipe 32 and the return pipe 33; adjacent communication devices 34 are connected to each other through support pipes 36, and the communicating vessel 34 at the top is connected to the mounting base 31 through the support pipe 36; then all communicating vessels 34, water inlet pipes 32 and return pipes 33 are suspended through a number of support pipes 36, so that the entire water inlet pipe 32 and return pipe 33 can penetrate into the bottom of the well and remain relatively fixed with the geothermal well 1. The spacing between adjacent communicating vessels 34 can be designed according to actual cost requirements and can be selected within 10 meters to 100 meters. Generally, the smaller the spacing, the more accurate the measured data. For shallow wells of about 100 meters, 10 meters can be selected, and for deep wells of about 2000 meters, 100 meters can be selected. The specific adjustment is based on actual needs.

[0046] More specifically, Figure 1 As shown, the thermal property testing device 2 includes a chassis 21, a data acquisition instrument 22, a circulating water pump 23, an electric heating water tank 24, a flow regulating valve 25, a flow sensor 26, a first temperature sensor 27 and a second temperature sensor 28; the circulating water pump 23 and the electric heating water tank 24 are both arranged in the chassis 21, and the input end of the circulating water pump 23 is connected to the electric heating water tank 24 through a third water pipe 231, and the output end of the circulating water pump 23 is connected to the water inlet pipe 32 through a fourth water pipe 232; the circulating water pump 23 draws water from the electric heating tank into the water inlet pipe 32, and then the water flows from a deep communicating vessel 34 to the return pipe 33, and then returns to the ground from the return pipe 33. The return pipe 33 is connected to the electric heating water tank 24 through the fifth water pipe 29, and then finally flows back to the electric heating water tank 24. Whether the electric heater in the electric heating water tank 24 heats the water source is selected according to different test steps.

[0047] like Figure 1As shown, the fifth water pipe 29 is equipped with a first temperature sensor 27 and a flow sensor 26; the fourth water pipe 232 is equipped with a second temperature sensor 28 and a flow control valve 25. The first temperature sensor 27, the second temperature sensor 28, and the flow sensor 26 are all electrically connected to the data acquisition device 22. Regarding the selection of the first temperature sensor 27 and the second temperature sensor 28, among commonly used temperature sensors, platinum resistance sensors offer the best linearity and stability. In this project's experiments, all temperature sensors used were Class A PT100 platinum resistance sensors, with a theoretical basic error of ±0.15°C.

[0048] At the same time, before and after the experiment, the first temperature sensor 27 and the second temperature sensor 28 are calibrated in the laboratory over the entire temperature range tested in the buried heat exchange device 3. After calibration, the temperature measurement error is controlled below ±0.1°C.

[0049] A high-precision turbine flowmeter was used to measure the circulating water. When the circulating water pump 23 was working stably, the flow sensor 26 used was calibrated using the volume method and compared with the data collected. The error of the flowmeter was less than 0.25% within the flow range of 0.9~2.0m' / h.

[0050] The second water pipe 331 and the fifth water pipe 29 from the thermal property testing device 2 to the buried thermal property testing device 2 are subjected to heat insulation treatment to reduce heat loss that may be caused by the support pipe 36.

[0051] Test steps: All test equipment and instruments are in place. Connect the thermal property test device 2 to the water inlet pipe 32 and return pipe 33 of the heat exchange device 3 using the second water pipe 331 and the fifth water pipe 29. Open one manifold 34 and conduct a reactive cycle for 2 hours. Observe that the inlet and outlet temperatures of the buried heat exchange medium are stable to obtain the initial average rock and soil temperature. Then, start the electric heating cycle and begin the "constant heat flow method" (constant heating power) test for 48 hours. Record the heating power, inlet and outlet water temperature, and flow rate data every 30 seconds. First, test with a heating capacity of 3.5 kW, then with a heating capacity of 7 kW. After completing the test at the same depth, close the manifold 34 at the current depth and open the manifold 34 at the next depth. Repeat the above steps until the data from the manifolds 34 at all depths are tested. Calculate the thermal property parameters. Alternatively, calculate the thermal property parameters of the geothermal well 1 between the two depths by taking the difference between the thermal property parameters measured at two depths.

[0052] More specifically, Figure 1 and Figure 2As shown, the communicating vessel 34 includes a shell body 341, a valve body 342 and a valve stem 343. The valve body 342 is arranged in the shell body 341. A water flow chamber 3421 and a valve chamber 3422 that cross and communicate with each other are provided in the valve body 342. The water flow chamber 3421 is arranged horizontally and the valve chamber 3422 is arranged vertically. The two form a cross-shaped cavity. The two ends of the water flow chamber 3421 are respectively connected to the water inlet pipe 32 and the return pipe 33. A valve stem 343 is slidingly arranged in the valve chamber 3422. A valve hole 3431 is radially penetrated on the valve stem 343. The valve stem 343 is controlled to move up and down in the valve chamber 3422 to connect the valve hole 3431 with the water flow chamber 3421, so that the water inlet pipe 32 and the return pipe 33 are connected. When the valve chamber 3422 is misaligned with the water flow chamber 3421, the water flow chamber 3421 is blocked by the valve stem 343, and water cannot flow through the water flow chamber 3421.

[0053] More specifically, Figure 1 and Figure 2As shown, a drive tube 37 is coaxially arranged in the support tube 36, and the drive tube 37 at the top is transmission-connected to the output end of the reducer 35; the upper end of the valve stem 343 extends into the drive tube 37 at the top of the communicating vessel 34 and is spline-connected thereto, and an external thread section 3432 is provided on the valve stem 343, and an internal thread section 3423 is provided at the lower end of the valve cavity 3422, and the external thread section 3432 is meshed with the internal thread section 3423, and the valve stem 343 is driven to rotate by the drive tube 37 at the top of the communicating vessel 34, thereby causing the valve stem 343 to move downward as a whole. When the external thread section 3432 is engaged with the internal thread section 3423, the valve stem 343 is driven to rotate by the drive tube 37 at the top of the communicating vessel 34, and the valve stem 343 is moved downward as a whole. After the segment 3423 is separated, the valve hole 3431 is located below the water flow chamber 3421 and the lower end of the valve stem 343 is transmission-connected to the drive tube 37 located at the bottom of the communicating vessel 34; and in the initial state, the valve chamber 3422 is located above the water flow chamber 3421, and the drive tube 37 is driven to rotate by the reducer 35, thereby driving the valve stem 343 to rotate. At the same time, the valve stem 343 moves downward in the valve chamber 3422 through the engagement of the external thread segment 3432 and the internal thread segment 3423, and the valve stem 343 as a whole rotates and moves downward. When the valve chamber 3422 rotates to the point where it is flush with the water flow chamber 3421, Normally, the valve cavity 3422 is coaxially connected to the water flow cavity 3421, so the current depth can be tested. At the same time, the reducer 35 needs to stop running to ensure that the valve cavity 3422 and the water flow cavity 3421 remain connected. After the current depth measurement is completed, the reducer 35 continues to rotate, thereby causing the valve stem 343 to continue to move downward until the valve cavity 3422 and the water flow cavity 3421 are misaligned. At the same time, the external thread section 3432 and the internal thread section 3423 are just separated. The inner cavity of the driving pipe 37 between the adjacent communicating vessels 34 includes a sliding cavity 371 and a first spline cavity 372 distributed up and down. A first end face tooth 373 is provided in the sliding cavity 371, and a second end face tooth 344 is provided at the lower end of the valve stem 343. When the valve stem 343 rotates until the external thread section 3432 is separated from the internal thread section 3423, the second end face tooth 344 engages with the first end face tooth 373. At this time, the valve stem 343 will not continue to move. The valve stem 343 acts as an intermediate transmission member to drive the next drive tube 37 to rotate, thereby controlling the valve body 342 of the next communicating vessel 34. The control method is consistent with the control method of the first group of communicating vessels 34, and the on and off of several communicating vessels 34 can be controlled in sequence from top to bottom.

[0054] like Figure 1 and Figure 2 As shown, the water inlet pipe 32 includes a plurality of first water pipes 321 and a first connecting pipe 322, and the first connecting pipe 322 is connected between adjacent first water pipes 321. The return water pipe 33 includes a plurality of second water pipes 331 and a second connecting pipe 332, and the second connecting pipe 332 is connected between adjacent second water pipes 331. The first water pipe 321 and the second water pipe 331 are usually made of PE pipes or alloy materials, while the first connecting pipe 322 and the second connecting pipe 332 are made of an alloy material that is lightweight, high in strength and has good thermal conductivity.

[0055] In specific implementation, the first connecting pipe 322 and the second connecting pipe 332 are symmetrically arranged on the left and right sides of the shell 341, and the first connecting pipe 322 and the second connecting pipe 332 are both slidably connected to the shell 341 through a telescopic mechanism 38; the telescopic mechanism 38 includes a screw 381, a spiral sleeve 382 and a sliding pipe 383, a sliding cavity 371 is coaxially opened in the screw 381, one end of the sliding cavity 371 is communicated with the first connecting pipe 322 or the second connecting pipe 332, and two ends of the water flow cavity 3421 are respectively connected to two sliding pipes 383, and the end of the sliding pipe 383 away from the valve body 342 is slidably placed in the sliding cavity 371, and a piston head or a plurality of rubber sealing rings are sleeved on the sliding pipe 383, and a mechanical seal can be used when necessary; the spiral sleeve 382 is rotatably arranged on the shell 341, the screw 381 passes through the spiral sleeve 382 and is threadedly matched with the spiral sleeve 382, ​​the spiral sleeve 382 can be separately provided with a motor for driving, or the spiral sleeve 382 can be transmission-connected to the valve stem 343.

[0056] like Figure 1-Figure 3 As shown, the telescopic mechanism 38 also includes a guide seat 384 and a plurality of guide rods 385. The top and bottom of the shell 341 are both provided with guide seats 384, and a plurality of guide cavities 3841 are spaced apart on the guide seat 384; a plurality of guide rods 385 are provided on the first connecting pipe 322, and one end of the guide rod 385 slides through the guide cavity 3841; the guide rod 385 is arranged parallel to the screw rod 381, and then the spiral sleeve 382 drives the screw rod 381 to move linearly during the rotation process, thereby making the first connecting pipe 322 and the second connecting pipe 332 move away from each other and abut against the inner wall of the geothermal well 1, which helps the first water pipe 321 and the second water pipe 331 to contact the well wall, thereby improving the heat exchange efficiency with the well wall. At the same time, the ends of the first connecting pipe 322 and the second connecting pipe 332 that are away from each other are each provided with a plurality of first cone spikes 3221. When the first connecting pipe 322 and the second connecting pipe 332 move away from each other, the first conical teeth carried by the two pipes penetrate into the well wall, which improves the heat exchange efficiency and helps to fix them to the well wall, thereby reducing the suspension pressure of the entire device.

[0057] More specifically, the portion of the spiral sleeve 382 located in the housing 341 is sleeved with a driven bevel gear 386, and the portion of the valve stem 343 located between the top of the valve body 342 and the housing 341 is slidingly sleeved with a driving bevel gear 387. The driving bevel gear 387 is transmission-connected to the valve stem 343, and the driving bevel gear 387 is meshed with the driven bevel gear 386, and then the two driven bevel gears 386 are synchronously driven to rotate through the driving bevel gear 387 to ensure the synchronous telescopic movement of the first connecting tube 322 and the second connecting tube 332.

[0058] When implementing it specifically, Figure 2As shown, a first external spline 3433 is provided at the upper end of the valve stem 343, the first external spline 3433 cooperates with the first spline cavity 372, a second external spline 3434 is provided at the part between the first external spline 3433 and the valve hole 3431, and the first external spline 3433 and the second external spline 3434 are spaced apart.

[0059] like Figure 2-Figure 4 As shown, the inner cavity of the active bevel gear 387 is provided with a second spline cavity 3871, and the second external spline 3434 cooperates with the second spline cavity 3871. When the valve stem 343 rotates downward in the valve cavity 3422 until the valve hole 3431 is connected to the water flow cavity 3421, the two screws 381 move outward to the farthest end. At the same time, the second external spline 3434 is separated from the second spline cavity 3871 and is connected to the active bevel gear 387 through the ratchet mechanism 388. In specific implementation, in the initial state, the second external spline 3434 cooperates with the second spline cavity 3871, and the valve stem 343 is When the driving tube 37 is driven to rotate, the active bevel gear 387 is driven to rotate, thereby causing the first connecting tube 322 and the second connecting tube 332 to move outward synchronously until they move to the farthest end, at which time they are in close contact with the well wall. At the same time, the valve cavity 3422 is connected to the water flow cavity 3421, and the second external spline 3434 is separated from the second spline cavity 3871. When the valve stem 343 continues to move downward, it will not drive the active bevel gear 387 to rotate. When the valve stem 343 continues to move downward, the second external spline 3434 begins to cooperate with the ratchet mechanism 388, but will not drive the active bevel gear 387 to rotate.

[0060] More specifically, Figure 2 and Figure 4 As shown, the ratchet mechanism 388 includes a drive seat 3881, a ratchet ring 3882 and a plurality of pawls 3883. The drive seat 3881 is slidably sleeved on the valve stem 343. The inner cavity of the drive seat 3881 is provided with a third spline cavity 3884. When the valve stem 343 continues to move downward to the lower end after the valve hole 3431 is connected with the water flow cavity 3421, the second external spline 3434 is always in cooperation with the third spline cavity 3884.

[0061] The ratchet ring 3882 is sleeved on the valve stem 343 and has a clearance fit with the valve stem 343. The ratchet ring 3882 is coaxially fixedly connected to the active bevel gear 387. A plurality of ratchet teeth 3885 are provided in an annular array in the inner cavity of the ratchet ring 3882. A plurality of pawls 3883 are provided in an annular array on the drive seat 3881. The drive seat 3881 is coaxially placed in the ratchet ring 3882 and has a clearance fit with the ratchet ring 3882. The pawl 3883 is hinged to the drive seat 3881, and the pawl 3883 is engaged with the ratchet teeth 3885 through a torsion spring. In specific implementation, only when the valve stem 343 rotates in the opposite direction, the second external spline 3434 is engaged with the ratchet gear 3885 through the ratchet mechanism 388. The active bevel gear 387 is connected in transmission, and after the test of the communicating vessels 34 at all depths is completed, when the entire heat exchange device 3 needs to be taken out, the reducer 35 is reversed, thereby driving all the driving pipes 37 and the valve stem 343 to rotate in the opposite direction. At this time, the valve stem 343 drives the driving seat 3881 to rotate through the second external spline 3434, and the driving seat 3881 drives the ratchet to rotate through the pawl 3883, thereby driving the active bevel gear 387 to reverse, and then the screw 381 moves to the side of the shell 341, so that the first connecting pipe 322 and the second connecting pipe 332 are separated from the inner wall of the geothermal well 1, so as to facilitate the subsequent removal of the entire heat exchange device 3.

[0062] More specifically, Figures 1-4 As shown, the first connecting pipe 322 and the second connecting pipe 332 are respectively provided with a first auxiliary heat exchanger 39 and a second auxiliary heat exchanger 40 , and the first auxiliary heat exchanger 39 and the second auxiliary heat exchanger 40 have the same structure.

[0063] The first auxiliary heat exchanger 39 includes an elastic metal plate 391, a support rod 392, a first pull rod 393 and a second pull rod 394. The middle part of the elastic metal plate 391 is fixed to the end of the first connecting tube 322 away from the second connecting tube 332, and support rods 392 are vertically arranged on both ends of the elastic metal plate 391; the elastic metal plate 391 has a certain elasticity and can bend appropriately and realize elastic deformation, and the support rods 392 can support the parts of the elastic metal plate 391 close to the two ends, so as to facilitate the driving of the elastic metal plate 391.

[0064] When implementing it specifically, Figure 3As shown, two first pull rods 393 are hinged on the support rod 392 at intervals, and the two first pull rods 393 are spaced apart from each other. Four first pull rods 393 are hinged on the two support rods 392 of the elastic metal plate 391 on the same side. The end of the first pull rod 393 away from the support rod 392 is hinged to the shell 341 or the guide seat 384; the two guide rods 385 at both ends of the guide seat 384 are both inclined to the outside of the shell 341. The two ends of the second pull rod 394 are hinged to the extension rod 395 and the first pull rod 393 respectively; then in the initial state, the first connecting tube 322 is in contact with the shell 341, and at this time, the four second pull rods 394 pull the first pull rods 393. A pull rod 393 rotates toward the center of the shell 341, and then the four first pull rods 393 make the two ends of the elastic metal plate 391 embrace the shell 341. As the first connecting pipe 322 and the second connecting pipe 332 move outward to the farthest end, the second pull rod 394 in the first auxiliary heat exchanger 39 and the second auxiliary heat exchanger 40 pushes the first pull rod 393 to flip outward as the extension rod 395 and the guide rod 385 move outward, thereby causing the two ends of the elastic metal plate 391 to flip outward and abut against the well wall, which helps the first connecting pipe 322 and the second connecting pipe 332 to contact the well wall for heat exchange, and at the same time can assist in fixing the current connecting vessel 34 to the well wall.

[0065] More specifically, Figure 1-Figure 3 As shown, the auxiliary heat exchanger further includes a clamping plate 396 , which is fixed to the first connecting pipe 322 , and the elastic metal plate 391 is located between the clamping plate 396 and the first connecting pipe 322 ; the first cone thorn 3221 is provided on the clamping plate 396 .

[0066] At the same time, a plurality of second cone thorns 3911 are arranged in an array on the plate surface of the elastic metal plate 391 away from the first connecting pipe 322. The second cone thorns 3911 have the same effect as the first cone thorns 3221, which is beneficial to heat conduction and assists the connection between the elastic metal plate 391 and the well wall.

[0067] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A deep hole field thermal response tester, characterized by: The invention comprises a thermal property testing device (2) and a heat exchange device (3), wherein the heat exchange device (3) comprises a mounting seat (31), a water inlet pipe (32), a water return pipe (33), a communicating vessel (34), a reducer (35) and a support pipe (36); the mounting seat (31) is mounted on the wellhead of a geothermal well (1); one end of the water inlet pipe (32) and the water return pipe (33) are sealed and placed in the geothermal well (1); the other ends of the water inlet pipe (32) and the water return pipe (33) extend out of the geothermal well (1) and are connected to the thermal property testing device (2); A plurality of communicating vessels (34) are provided at intervals in the portion where the water inlet pipe (32) and the water return pipe (33) are located in the geothermal well (1), and the communicating vessels (34) are respectively connected to the water inlet pipe (32) and the water return pipe (33); adjacent communicating vessels (34) are connected to each other via the support pipe (36), and the communicating vessel (34) located at the top is connected to the mounting seat (31) via the support pipe (36); The communicating vessel (34) comprises a housing (341), a valve body (342) and a valve stem (343); the valve body (342) is arranged in the housing (341); a water flow chamber (3421) and a valve chamber (3422) are arranged in the valve body (342), which intersect and communicate with each other; two ends of the water flow chamber (3421) are respectively communicated with the water inlet pipe (32) and the water return pipe (33); the valve stem (343) is slidably arranged in the valve chamber (3422); a valve hole (3431) is radially penetrated on the valve stem (343); the valve stem (343) is controlled to move up and down in the valve chamber (3422), thereby communicating the valve hole (3431) with the water flow chamber (3421), thereby communicating the water inlet pipe (32) and the water return pipe (33); A driving tube (37) is coaxially arranged in the support tube (36), and the driving tube (37) at the top is transmission-connected to the output end of the reducer (35); the upper end of the valve stem (343) extends into the driving tube (37) at the top of the communicating vessel (34) and is spline-connected thereto, and an external thread section (3432) is provided on the valve stem (343), and an internal thread section (3423) is provided at the lower end of the valve cavity (3422). The outer thread section (3432) is engaged with the inner thread section (3423), and the valve stem (343) is driven to rotate through the driving tube (37) at the top of the communicating vessel (34), thereby causing the valve stem (343) to move downward as a whole. When the outer thread section (3432) is separated from the inner thread section (3423), the valve hole (3431) is located below the water flow cavity (3421) and the lower end of the valve stem (343) is in transmission connection with the driving tube (37) located at the bottom of the communicating vessel (34).

2. A deep hole field thermal response tester according to claim 1, characterized in that: The inner cavity of the driving tube (37) between the adjacent communicating vessels (34) includes a sliding cavity (371) and a first spline cavity (372) distributed above and below, and a first end face tooth (373) is provided in the sliding cavity (371). The lower end of the valve stem (343) is provided with a second end face tooth (344). When the valve stem (343) rotates until the external thread section (3432) and the internal thread section (3423) are separated, the second end face tooth (344) engages with the first end face tooth (373).

3. A deep hole field thermal response tester according to claim 2, characterized in that: The water inlet pipe (32) includes a plurality of first water pipes (321) and a first connecting pipe (322), and the first connecting pipes (322) are provided between adjacent first water pipes (321). The water return pipe (33) includes a plurality of second water pipes (331) and a second connecting pipe (332), and the second connecting pipes (332) are provided between adjacent second water pipes (331). The first connecting tube (322) and the second connecting tube (332) are symmetrically arranged on the left and right sides of the shell (341), and the first connecting tube (322) and the second connecting tube (332) are both slidably connected to the shell (341) via a telescopic mechanism (38); The telescopic mechanism (38) includes a screw (381), a screw sleeve (382) and a slide tube (383); a slide cavity (371) is coaxially provided in the screw (381); one end of the slide cavity (371) is communicated with the first connecting tube (322) or the second connecting tube (332); two ends of the water flow cavity (3421) are respectively connected to two slide tubes (383); one end of the slide tube (383) away from the valve body (342) is slidably placed in the slide cavity (371); the screw sleeve (382) is rotatably arranged on the housing (341); the screw (381) passes through the screw sleeve (382) and is threadedly engaged with the screw sleeve (382); the screw sleeve (382) is transmission-connected to the valve stem (343); The telescopic mechanism (38) further comprises a guide seat (384) and a plurality of guide rods (385). The guide seats (384) are provided at the top and bottom of the housing (341), and a plurality of guide cavities (3841) are provided at intervals on the guide seat (384); a plurality of guide rods (385) are provided on the first connecting tube (322), and one end of the guide rod (385) slides through the guide cavity (3841); the guide rod (385) is provided in parallel with the screw rod (381).

4. A deep hole field thermal response tester according to claim 3, characterized in that: The portion of the spiral sleeve (382) located in the housing (341) is sleeved with a driven bevel gear (386), and the portion of the valve stem (343) located between the top of the valve body (342) and the housing (341) is slidably sleeved with a driving bevel gear (387). The driving bevel gear (387) is transmission-connected to the valve stem (343), and the driving bevel gear (387) is meshed with the driven bevel gear (386).

5. A deep hole field thermal response tester according to claim 4, characterized in that: The upper end of the valve stem (343) is provided with a first external spline (3433), the first external spline (3433) cooperates with the first spline cavity (372), a second external spline (3434) is provided between the first external spline (3433) and the valve hole (3431), and the first external spline (3433) and the second external spline (3434) are spaced apart. The inner cavity of the active bevel gear (387) is provided with a second spline cavity (3871), and the second external spline (3434) cooperates with the second spline cavity (3871). When the valve stem (343) rotates downward in the valve cavity (3422) until the valve hole (3431) is connected to the water flow cavity (3421), the two screw rods (381) move outward to the farthest end. At the same time, the second external spline (3434) is separated from the second spline cavity (3871) and is connected to the active bevel gear (387) through the ratchet mechanism (388).

6. A deep hole field thermal response tester according to claim 5, characterized in that: The ratchet mechanism (388) includes a drive seat (3881), a ratchet ring (3882) and a plurality of ratchet pawls (3883); the drive seat (3881) is slidably sleeved on the valve stem (343); a third spline cavity (3884) is provided in the inner cavity of the drive seat (3881); and when the valve stem (343) continues to move downward to the lowermost end after the valve hole (3431) is connected with the water flow cavity (3421), the second external spline (3434) always cooperates with the third spline cavity (3884); The ratchet ring (3882) is sleeved on the valve stem (343) and is loosely fitted with the valve stem (343). The ratchet ring (3882) is coaxially fixedly connected to the active bevel gear (387). A plurality of ratchet teeth (3885) are provided in an annular array in the inner cavity of the ratchet ring (3882). A plurality of ratchet pawls (3883) are provided in an annular array on the drive seat (3881). The drive seat (3881) is coaxially placed in the ratchet ring (3882) and is loosely fitted with the ratchet ring (3882). The ratchet pawls (3883) are hinged to the drive seat (3881). The ratchet pawls (3883) are meshed with the ratchet teeth (3885) via a torsion spring. When the valve stem (343) rotates in the reverse direction, the second external spline (3434) is in transmission connection with the driving bevel gear (387).

7. A deep hole field thermal response tester according to claim 6, characterized in that: A plurality of first cone spikes (3221) are provided on the ends of the first connecting tube (322) and the second connecting tube (332) that are away from each other.

8. A deep hole field thermal response tester according to claim 7, characterized in that: A first auxiliary heat exchanger (39) and a second auxiliary heat exchanger (40) are respectively provided on the first connecting pipe (322) and the second connecting pipe (332), and the first auxiliary heat exchanger (39) and the second auxiliary heat exchanger (40) have the same structure; The first auxiliary heat exchanger (39) includes an elastic metal plate (391), a support rod (392), a first pull rod (393) and a second pull rod (394); the middle portion of the elastic metal plate (391) is fixed to an end of the first connecting tube (322) away from the second connecting tube (332); and the support rods (392) are vertically arranged on both left and right ends of the elastic metal plate (391); Two first pull rods (393) are hinged at intervals on the support rod (392), and one end of the first pull rod (393) away from the support rod (392) is hinged to the shell (341) or the guide seat (384); the two guide rods (385) at both ends of the guide seat (384) are both provided with extension rods (395) inclined toward the outside of the shell (341), and the two ends of the second pull rod (394) are hinged to the extension rod (395) and the first pull rod (393) respectively.

9. A deep hole field thermal response tester according to claim 8, characterized in that: The first auxiliary heat exchanger (39) further includes a clamping plate (396), the clamping plate (396) being fixed to the first connecting pipe (322), the elastic metal plate (391) being located between the clamping plate (396) and the first connecting pipe (322); the first cone thorn (3221) being provided on the clamping plate (396); A plurality of second cone spikes (3911) are arranged in an array on the plate surface of the elastic metal plate (391) on a side away from the first connecting tube (322).

10. A deep hole field thermal response tester according to claim 9, characterized in that: The thermal property testing device (2) comprises a chassis (21), a data acquisition instrument (22), a circulating water pump (23), an electric heating water tank (24), a flow regulating valve (25), a flow sensor (26), a first temperature sensor (27), and a second temperature sensor (28); The circulating water pump (23) and the electric heating water tank (24) are both arranged in the chassis (21); the input end of the circulating water pump (23) is connected to the electric heating water tank (24) through a third water pipe (231); and the output end of the circulating water pump (23) is connected to the water inlet pipe (32) through a fourth water pipe (232); The return water pipe (33) is connected to the electric heating water tank (24) through a fifth water pipe (29), and the fifth water pipe (29) is provided with a first temperature sensor (27) and a flow sensor (26); The fourth water pipe (232) is provided with a second temperature sensor (28) and a flow regulating valve (25); The first temperature sensor (27), the second temperature sensor (28), and the flow sensor (26) are all electrically connected to the data acquisition device (22).

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