A performance detection device for temperature-resistant high-thermal-conductivity well cement for geothermal wells

Abstract

This utility model discloses a testing device for the performance of high-temperature resistant and high-thermal-conductivity cementing materials for geothermal wells. It includes a support frame, a housing mounted on the support frame, a partition inside the housing, an inner cylinder above the partition, and an outer cylinder coaxially mounted outside the inner cylinder. A first annular through hole is provided on the partition between the outer and inner cylinders. A second annular through hole, vertically connected to the first annular through hole, is provided on the top plate of the housing. An annular lifting plate is located below the partition, and a support plate is located at the bottom of the annular lifting plate. A first hydraulic cylinder is located at the bottom of the housing, with its telescopic end penetrating the bottom plate and fixedly connected to the support plate. A second hydraulic cylinder is mounted on the support, with a connecting pipe at its telescopic end, and a rebound hammer is mounted on the connecting pipe. This utility model can rapidly test the high-temperature resistant and high-thermal-conductivity efficiency of cementing materials and the molding strength of cementing materials at different temperature layers in geothermal wells, achieving high testing efficiency.

Description

Technical Field

[0001] This utility model relates to the field of performance testing technology for high-temperature resistant and high-thermal-conductivity cementing cement for geothermal wells, and in particular to a device for testing the performance of high-temperature resistant and high-thermal-conductivity cementing cement for geothermal wells. Background Technology

[0002] Geothermal wells refer to methods and devices for generating electricity from geothermal energy or hot spring water with a temperature greater than 30℃ at a depth of about 3500 meters. Geothermal energy is classified into three categories: high-temperature, medium-temperature, and low-temperature. High-temperature geothermal energy exists in the form of steam at temperatures above 150℃; medium-temperature geothermal energy exists in the form of a mixture of water and steam at temperatures between 90℃ and 150℃; and low-temperature geothermal energy exists in the form of warm water, warm-hot water, or hot water at temperatures above 25℃ and below 90℃. On March 12, 2010, a geothermal well was successfully drilled in Fengheying Village, Daxing District, Beijing. Measurements showed a temperature of 103℃, breaking the record for the highest geothermal water temperature in Beijing and becoming the first medium-temperature geothermal well in the city. Geothermal wells are an important tool for the development and utilization of geothermal resources. Cementing, as a key step in the well formation process, refers to the process of injecting cementing material between the buried pipe and the borehole wall of the geothermal well. The cementing material plays a role in heat exchange between the geothermal well heat exchanger and the rock and soil, and at the same time, it can prevent the aquifer from being contaminated by the geothermal well.

[0003] Currently, there is limited attention paid to performance testing technology for high-temperature resistant and high-thermal-conductivity cementing materials used in geothermal wells. This leads to difficulties in determining the high-temperature resistant and high-thermal-conductivity efficiency of cementing materials at different temperature layers in geothermal wells, as well as the molding strength of the cementing material. Consequently, cementing performance testing is challenging and inefficient. Therefore, a performance testing device for high-temperature resistant and high-thermal-conductivity cementing materials used in geothermal wells is needed to evaluate their performance. Utility Model Content

[0004] This invention provides a device for testing the performance of high-temperature resistant and high-thermal-conductivity cementing for geothermal wells, which solves the problems of high difficulty and low efficiency in testing the performance of traditional high-temperature resistant and high-thermal-conductivity cementing for geothermal wells.

[0005] This utility model provides a testing device for the performance of high-temperature resistant and high-thermal-conductivity cementing for geothermal wells, including a support frame, a box body mounted on the support frame, a partition plate mounted inside the box body, an inner cylinder body mounted on the partition plate, an outer cylinder body coaxially mounted outside the inner cylinder body, a first annular through hole mounted on the partition plate between the outer cylinder body and the inner cylinder body, a second annular through hole vertically connected to the first annular through hole mounted on the top plate of the box body, an annular lifting plate mounted below the partition plate, a support plate fixedly connected to the bottom of the annular lifting plate, and a first hydraulic cylinder mounted at the bottom of the box body, the telescopic end of the first hydraulic cylinder penetrating the bottom plate of the box body and fixedly connected to the support plate.

[0006] Furthermore, a heater fixedly connected to the partition is installed inside the inner cylinder, and temperature sensors are installed on both the inner wall of the inner cylinder and the outer wall of the outer cylinder.

[0007] Furthermore, a support base is provided on the top of the box body, a second hydraulic cylinder is provided on the support base, a connecting pipe is provided on the telescopic end of the second hydraulic cylinder, and a rebound spring is provided on the connecting pipe.

[0008] Furthermore, an inspection port is provided on the side wall of the enclosure, and an inspection door is provided on the inspection port.

[0009] Furthermore, a plurality of limiting seats are arranged in a circumferential array around the second annular through hole and are fixedly connected to the top plate of the box.

[0010] Furthermore, each of the limiting seats includes a third hydraulic cylinder, a fixed seat, and a limiting block. The fixed seat is fixedly connected to the top plate of the housing. The fixed seat is provided with a third hydraulic cylinder and a guide hole. The telescopic end of the third hydraulic cylinder passes through the guide hole and connects to the limiting block. The front end face of the limiting block is set as an arc-shaped groove.

[0011] As can be seen from the above technical solutions, this utility model provides a device for testing the performance of high-temperature resistant and high-thermal-conductivity cementing for geothermal wells.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] 1. By transferring heat from a high-temperature liquid to a low-temperature liquid through different test blocks, and by detecting the heating time of the low-temperature liquid, the heat conduction rate of different cement test blocks can be obtained. The test results provide a reference for the construction of high-temperature resistant and high-thermal-conductivity cementing cement for geothermal wells. By rationally configuring the amount of cement, cement waste will not occur, and the utilization rate of cement will be improved.

[0014] 2. The support plate is driven by the first hydraulic cylinder to raise the annular lifting plate to a higher position, which can raise the cement test block formed in the first annular cavity to the top of the box. The rebound hammer is driven by the second hydraulic cylinder to facilitate the strength test of the cement test block. The cement test block is easy to disassemble and assemble during the test, the test range is large, and the test results are highly accurate. Attached Figure Description

[0015] To more clearly illustrate the technical solution of this utility model, the drawings used in the implementation examples will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0016] Figure 1This is a schematic diagram of the overall structure of a high-temperature resistant and high-thermal-conductivity cementing performance testing device for geothermal wells proposed in this utility model.

[0017] Figure 2 This is a top view schematic diagram of the overall structure of a high-temperature resistant and high-thermal-conductivity cementing performance testing device for geothermal wells proposed in this utility model;

[0018] Figure 3 This is a cross-sectional view of the overall structure of a high-temperature resistant and high-thermal-conductivity cementing performance testing device for geothermal wells proposed in this utility model.

[0019] Figure 4 This is a three-dimensional structural diagram of the limiting seat for a geothermal well high-temperature resistant and thermally conductive cementing performance testing device proposed in this utility model.

[0020] In the picture:

[0021] 1-Staff;

[0022] 2-Box body; 20-Inspection door; 21-Baffle; 22-First annular through hole; 23-Second annular through hole; 24-Heater; 25-Temperature sensor; 26-Support base; 27-Second hydraulic cylinder; 28-Connecting pipe; 29-Rebound spring;

[0023] 3-Inner cylinder;

[0024] 4-Outer cylinder;

[0025] 5- Circular lifting plate;

[0026] 6-Support plate;

[0027] 7-First hydraulic cylinder;

[0028] 8-Limit seat; 81-Second hydraulic cylinder; 82-Fixed seat; 83-Limit block; 831-Arc-shaped groove. Detailed Implementation

[0029] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0030] Example 1:

[0031] See Figure 1-4A device for testing the performance of high-temperature resistant and thermally conductive cementing cement for geothermal wells includes a support 1, which is a three-dimensional steel frame. A rectangular, fully enclosed box 2 is mounted on the support 1. A horizontal partition 21 is installed inside the box 2, and the partition 21 is welded and fixed to the inner wall of the box 2 on all four sides. A vertical inner cylinder 3 is installed in the middle of the upper part of the partition 21. The lower end of the inner cylinder 3 is sealed and fixed to the surface of the partition 21, and the upper end of the inner cylinder 3 is sealed and fixed to the top plate of the box 2. An outer cylinder 4 is coaxially sleeved on the outside of the inner cylinder 3, forming a first ring between the inner cylinder 3 and the outer cylinder 4. The outer cylinder 4 and the box body 2 form a closed second annular cavity. The first annular cavity is used to form an annular cement experimental block, and the second annular cavity is used to store low-temperature liquid. The inner cylinder 3 is used to store high-temperature liquid. The top of the box body 2 is provided with a liquid inlet communicating with the inner cylinder 3. The lower end of the outer cylinder 4 is sealed and fixed to the surface of the partition plate 21, and the upper end of the outer cylinder 4 is sealed and fixed to the top plate of the box body 2. The partition plate 21 between the outer cylinder 4 and the inner cylinder 3 is provided with a first annular through hole 22, which connects the first annular cavity to the partition plate 21. The space below plate 21 is open. A second annular through hole 23 is provided on the top plate of box 2, which is vertically connected to the first annular through hole 22 and the first annular cavity. An annular lifting plate 5 is provided below the partition plate 21. A support plate 6 is fixedly connected to the bottom of the annular lifting plate 5. A first hydraulic cylinder 7 is provided at the bottom of box 2. The telescopic end of the first hydraulic cylinder 7 passes through the bottom plate of box 2 and is fixedly connected to the support plate 6. The support plate 6 is driven by the first hydraulic cylinder 7 to raise the annular lifting plate 5, so that the cement test block formed in the first annular cavity can be raised to the top of box 2 for strength testing. At the same time, the cement test block can be removed from the first annular cavity for testing other cement samples. By filling the inner cylinder 3 with high-temperature liquid, the heat of the high-temperature liquid is transferred to the low-temperature liquid through different test blocks. By detecting the heating time of the low-temperature liquid, the heat conduction speed of different cement test blocks to be tested can be obtained. The test results provide a reference for the construction of high-temperature resistant and high-thermal-conductivity cementing cement for geothermal wells. By reasonably configuring the amount of cement, cement waste will not occur, and the utilization rate of cement will be improved.

[0032] In this embodiment, see Figure 3 A heater 24 is fixedly connected to the partition plate 21 inside the inner cylinder 3. Temperature sensors 25 are installed on the inner wall of the inner cylinder 3 and the outer wall of the outer cylinder 4. The temperature sensors 25 are used to detect the temperature of the liquid inside the inner cylinder 3 and the temperature of the liquid in the second annular cavity formed between the outer cylinder 4 and the box 2.

[0033] In this embodiment, see Figure 1 , 2A support base 26 is fixedly installed on the top of the box body 2. A second hydraulic cylinder 27 is fixedly installed on the support base 26. A connecting pipe 28 is fixedly installed on the telescopic end of the second hydraulic cylinder 27. The connecting pipe 28 is sleeved on the outer wall of the rebound hammer 29 and fixed. The second hydraulic cylinder 27 drives the detection end of the rebound hammer 29 on the connecting pipe 28 to vertically touch the side wall of the cement block for strength testing. After the test is completed, the operator records the measurement value in time and marks it on the surface of the cement block.

[0034] In this embodiment, see Figure 3 An inspection port is provided on the side wall of the enclosure 2, and an inspection door 20 is provided on the inspection port. By opening the inspection door 20, it is convenient to replace and repair the parts inside the enclosure 2.

[0035] In this embodiment, see Figure 2 , 4 Three limiting seats 8 are arranged in a circular array around the second annular through hole 23 and are fixedly connected to the top plate of the box body 2. The three limiting seats 8 facilitate the clamping and fixing of the cement test block. Each limiting seat 8 includes a third hydraulic cylinder 81, a fixed seat 82, and a limiting block 83. The fixed seat 82 is fixedly connected to the top plate of the box body 2. The third hydraulic cylinder 81 is provided on the fixed seat 82. The fixed seat 82 is provided with a guide hole. The telescopic end of the third hydraulic cylinder 81 passes through the guide hole and connects to the limiting block 83. The front end face of the limiting block 83 is set as an arc-shaped groove 831. The arc-shaped groove 831 facilitates the increase of the contact area between the limiting block 83 and the cylindrical surface of the cement test block, thereby improving the stability of the clamping and fixing of the cement test block.

[0036] In this embodiment, the first hydraulic cylinder 7, heater 24, temperature sensor 25, second hydraulic cylinder 27, rebound spring 29, and third hydraulic cylinder 81 are all commercially available products. They are electrically connected to the controller on the housing 2 via cables. The controller's display can show the real-time temperature of each temperature sensor 25. The start and stop can be controlled sequentially by pressing the buttons on the controller panel. Alternatively, a PLC control system can be used for programmed control.

[0037] As can be seen from the above technical solution, in use, firstly, the annular lifting plate 5 on the support plate 6 is driven upward by the first hydraulic cylinder 7 to enter the second annular through hole 23, so that the bottom of the first annular cavity is sealed. Then, anti-sticking oil is applied to the outer wall of the inner cylinder 3, the inner wall of the outer cylinder 4, and the upper end face of the annular lifting plate 5. Then, the prepared cement slurry is poured into the first annular cavity. The cement in the first annular cavity is spread evenly and compacted by a scraper, or the poured cement test block is placed into the first annular cavity for testing. Then, a high-temperature liquid (which can be pure water or heat transfer oil) is poured into the inner cylinder 3. The temperature of the high-temperature liquid is T0, and it is heated by the heater 24 to maintain a constant temperature. Then, a low-temperature liquid is poured into the second annular cavity. The temperature of the low-temperature liquid is T1. The temperature change value of the low-temperature liquid at each time point is recorded. A time-temperature change curve is plotted to determine the thermal conductivity of cement block one. Then, the annular lifting plate 5 on the support plate 6 is driven by the first hydraulic cylinder 7 to continue moving upward into the first annular cavity, raising cement block one to be flush with the upper surface of the box 2. Then, the controller controls the three limiting seats 8 to clamp and fix the side walls of cement block one from three directions. Then, the controller controls the second hydraulic cylinder 27 to drive the detection end of the rebound hammer 29 to touch the side wall of cement block one, and performs a rebound force test on the side wall of cement block one to detect the molding strength of cement block one. During the test, the controller can control the limiting seats 8 to release cement block one. Then, the operator can rotate cement block one to test the side walls of cement block one in other directions. After the test is completed, cement block one is removed. The above steps can be repeated to test the performance of other cement blocks.

[0038] Other embodiments of the present invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. The present invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope of the invention is indicated by the claims.

[0039] It should be understood that this utility model is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model.

Claims

1. A device for testing the performance of high-temperature resistant and high-thermal-conductivity cementing for geothermal wells, characterized in that: The system includes a support (1), a box (2) on the support (1), a partition (21) inside the box (2), an inner cylinder (3) on the partition (21), an outer cylinder (4) coaxially outside the inner cylinder (3), a first annular through hole (22) on the partition (21) between the outer cylinder (4) and the inner cylinder (3), a second annular through hole (23) vertically connected to the first annular through hole (22) on the top plate of the box (2), an annular lifting plate (5) below the partition (21), a support plate (6) fixedly connected to the bottom of the annular lifting plate (5), a first hydraulic cylinder (7) at the bottom of the box (2), and the telescopic end of the first hydraulic cylinder (7) passing through the bottom plate of the box (2) and fixedly connected to the support plate (6).

2. The performance detection device for temperature-resistant and high-thermal-conductivity well cement for geothermal wells according to claim 1, characterized in that, A heater (24) is fixedly connected to the partition (21) inside the inner cylinder (3), and temperature sensors (25) are provided on the inner wall of the inner cylinder (3) and the outer wall of the outer cylinder (4).

3. The device for testing the performance of high-temperature resistant and high-thermal-conductivity cementing for geothermal wells according to claim 1, characterized in that, The top of the box (2) is provided with a support base (26), and a second hydraulic cylinder (27) is provided on the support base (26). A connecting pipe (28) is provided at the telescopic end of the second hydraulic cylinder (27), and a rebound device (29) is provided on the connecting pipe (28).

4. The device for testing the performance of high-temperature resistant and high-thermal-conductivity cementing cement for geothermal wells according to claim 3, characterized in that, An inspection port is provided on the side wall of the box (2), and an inspection door (20) is provided on the inspection port.

5. The device for testing the performance of high-temperature resistant and high-thermal-conductivity cementing for geothermal wells according to claim 1, characterized in that, The second annular through hole (23) is surrounded by a plurality of limiting seats (8) that are fixedly connected to the top plate of the box (2).

6. The device for testing the performance of high-temperature resistant and high-thermal-conductivity cementing cement for geothermal wells according to claim 5, characterized in that, Each of the limiting seats (8) includes a third hydraulic cylinder (81), a fixed seat (82), and a limiting block (83). The fixed seat (82) is fixedly connected to the top plate of the housing (2). The fixed seat (82) is provided with a third hydraulic cylinder (81) and a guide hole. The telescopic end of the third hydraulic cylinder (81) passes through the guide hole and is connected to the limiting block (83). The front end face of the limiting block (83) is set as an arc-shaped groove (831).

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