Spring type rock in-situ thermophysical property testing device for deep well

Abstract

The utility model relates to the technical field of deep well rock soil thermophysical property in-situ testing, in particular to a deep well spring type rock in-situ thermophysical property testing device which comprises a drill rod and a testing probe which are sequentially connected, and a testing assembly, a driving assembly and a data storage assembly are arranged in the testing probe; the system further comprises a control terminal and a winding device. The control terminal is connected with the data storage assembly. The winding device is connected with the driving assembly; the driving assembly comprises a connecting mechanism used for connecting the testing assembly and the winding device. When the testing device is used for testing, thermophysical parameters of rocks in different layers can be tested under the open hole well condition, risks caused in the rock core sampling process are avoided, and time and cost are saved; when in-situ testing is carried out, parameters such as pressure, temperature and humidity are the same as those in actual operation, influences of actual states of different depths are considered, the measured rock thermophysical parameters better conform to actual conditions, and the accuracy of measured data is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of in-situ testing of thermal properties of deep well rocks, in particular to a spring-type in-situ thermal property testing device for deep well rocks. Background Art

[0002] Geothermal resources are a kind of renewable clean energy with abundant reserves. The extraction and utilization of geothermal resources usually requires drilling geothermal wells. In order to know the actual heat exchange capacity of geothermal wells, it is necessary to measure the thermophysical parameters of underground rock formations. The current process of measuring rock thermophysical parameters generally involves first using drilling equipment with special sampling tubes to collect deep well rock samples, and then quickly sending them to professional laboratories for testing.

[0003] This measurement method has many defects: 1) In areas with complex rock in deep wells, it is difficult to obtain core samples, which increases the safety risk of drilling; 2) Core sampling requires the use of professional sampling drill bits to drill complete rock samples, which increases sampling costs and extends drilling time; 3) After the samples are obtained, they need to be sent to the laboratory for testing. Due to the difference between the sample measurement environment and the actual environment, there is a large error between the measurement results and the actual situation, which brings instability to the subsequent design of the geothermal system.

[0004] In summary, there is an urgent need for a testing device and a testing method that can realize in-situ testing of thermal physical parameters such as thermal conductivity and thermal diffusivity of rocks in different layers under open hole conditions, so as to solve many problems existing in the prior art. Utility Model Content

[0005] The utility model aims to provide a spring-type rock in-situ thermal property testing device suitable for deep wells to solve many problems existing in the prior art. The specific technical solution is as follows:

[0006] A spring-type rock in-situ thermal property testing device for deep wells, comprising a drill rod and a testing probe connected in sequence, wherein the drill rod and the testing probe are hollow structures and are connected to each other; a steel cone is connected to the bottom of the testing probe;

[0007] The test probe is provided with a test component, a drive component and a data storage component, and the test component is connected to the drive component and the data storage component respectively;

[0008] It also includes a control terminal and a hoisting device, wherein the control terminal is connected to the data storage component; the hoisting device is connected to the driving component;

[0009] The driving assembly comprises a connecting mechanism for connecting the testing assembly and the hoisting device.

[0010] Furthermore, the test assembly includes a protective cover and a test probe, the protective cover is arranged on the inner wall of the test probe, one end of the protective cover is provided with an opening, the test probe is slidably connected in the protective cover, and the detection surface of the test probe faces the opening end of the protective cover.

[0011] Furthermore, one end of the test probe away from the detection surface is connected to the protective cover via a spring; and pull rods are respectively provided on two opposite side surfaces of the test probe perpendicular to the detection surface.

[0012] Furthermore, the connecting mechanism includes a steel wire rope connected to the hoisting device, and the steel wire rope is connected to the first steel wire rope and the second steel wire rope via a first connecting member.

[0013] Furthermore, the test probe is provided with a notch for the test probe to pass through; the first wire rope is connected to a protective latch plate for covering the notch after passing around the first fixed pulley; the protective latch plate is slidably connected to the outside of the test probe to open and close the notch;

[0014] A camera device is arranged above the protective cover, and the camera device is connected to the control terminal signal.

[0015] Furthermore, the second steel wire rope is connected to the third steel wire rope and the fourth steel wire rope via the second connecting member, the third steel wire rope is connected to the pull rod 1 on one side of the test probe after passing around the second fixed pulley, and the fourth steel wire rope is connected to the pull rod 2 on the other side of the test probe after passing around the third fixed pulley.

[0016] Further, the data storage component includes a control circuit, a storage module and a communication module;

[0017] The detection surface of the test probe is provided with a heat insulating block, the heat insulating block is provided with a heating wire, the heating wire is connected to a control circuit, and the control circuit is connected to a power supply.

[0018] Furthermore, the surface of the heating wire is covered with an insulating protective film.

[0019] The application of the technical solution of the utility model has the following beneficial effects:

[0020] The utility model provides a spring-type in-situ thermal property testing device for rocks for deep wells, comprising a drill rod and a test probe connected in sequence, wherein the drill rod and the test probe are hollow structures and the drill rod and the test probe are connected; a steel cone is connected to the bottom of the test probe; a test assembly, a drive assembly and a data storage assembly are arranged in the test probe, and the test assembly is connected to the drive assembly and the data storage assembly respectively; a control terminal and a hoisting device are also included, wherein the control terminal is connected to the data storage assembly; the hoisting device is connected to the drive assembly; the drive assembly includes a connecting mechanism for connecting the test assembly and the hoisting device. The test device provided by the utility model can realize the testing of thermal property parameters of rocks in different layers under open hole conditions, eliminating the risks brought about in the process of core collection, while saving time and cost; and when conducting in-situ testing, the influence of actual conditions such as temperature and pressure at different depths is considered, so that the measured thermal property parameters of rocks are more in line with the actual situation, and the accuracy of the measurement data is improved.

[0021] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0023] Figure 1 It is a schematic diagram of the overall structure of the test device of the utility model;

[0024] Figure 2 It is a schematic diagram of the structure of the test component;

[0025] Figure 3 This is a schematic diagram of the connection between the second wire rope and the test probe;

[0026] Among them, 1. Drill rod, 2. Test probe, 2.1. Steel cone, 3. Test assembly, 3.1. Protective cover, 3.2. Test probe, 3.2.1. Detection surface, 3.3. Pull rod, 3.3.1. Pull rod 1, 3.3.2. Pull rod 2, 3.4. Spring, 3.5. Insulation block, 3.6. Heating wire, 3.7. Insulation protective film, 4. Drive assembly, 5. Data storage assembly, 5.1. Communication cable, 5. 2. Cable, 6. Connecting mechanism, 6.1. Steel wire rope, 6.1.1. First steel wire rope, 6.1.2. Second steel wire rope, 6.1.3. Third steel wire rope, 6.1.4. Fourth steel wire rope, 6.2. First connecting piece, 6.3. First fixed pulley, 6.4. Second connecting piece, 6.5. Second fixed pulley, 6.6. Third fixed pulley, 7. Protective latch plate, 8. Camera device, 9. Deep well wall. DETAILED DESCRIPTION

[0027] The embodiments of the present invention are described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered by the claims.

[0028] In the description of the present invention, it should be noted that the terms "top", "bottom", "left", "right", "vertical", "lateral", "inside", "outside", "front", "back", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0029] Example:

[0030] See also Figure 1 The present embodiment provides a spring-type rock in-situ thermal property testing device for deep wells, comprising a drill pipe 1 and a testing probe 2 connected in sequence, wherein the drill pipe 1 and the testing probe 2 are hollow structures and the drill pipe 1 and the testing probe 2 are connected; a steel cone 2.1 is connected to the bottom of the testing probe 2; when the steel cone 2.1 contacts the bottom surface of the deep well, it plays a protective and buffering role.

[0031] The test probe 2 is provided with a test component 3, a drive component 4 and a data storage component 5, and the test component 3 is connected to the drive component 4 and the data storage component 5 respectively;

[0032] It also includes a control terminal and a hoisting device, wherein the control terminal is connected to the data storage component 5; the hoisting device is connected to the drive component 4; the control terminal includes a control system, a computer PC or a mobile phone; and the hoisting device is a hoist.

[0033] The driving assembly 4 comprises a connecting mechanism 6 for connecting the testing assembly 3 and the hoisting device.

[0034] In this embodiment, participating Figure 1 and Figure 2 The test assembly 3 includes a protective cover 3.1 and a test probe 3.2. The protective cover 3.1 is arranged on the inner wall of the test probe 2. One end of the protective cover 3.1 is provided with an opening. The test probe 3.2 is slidably connected in the protective cover 3.1. The detection surface 3.2.1 of the test probe 3.2 faces the opening end of the protective cover 3.1.

[0035] In this embodiment, see Figure 2 and Figure 3 One end of the test probe 3.2 away from the detection surface 3.2.1 is connected to the protective cover 3.1 through a spring 3.4; pull rods 3.3 are respectively provided on two opposite sides of the test probe 3.2 perpendicular to the detection surface 3.2.1.

[0036] In this embodiment, see Figure 1 The connection mechanism 6 includes a steel wire rope 6.1 connected to the hoisting device, the steel wire rope 6.1 extends into the test probe 2 through the drill rod 1, and connects the first steel wire rope 6.1.1 and the second steel wire rope 6.1.2 through the first connecting member 6.2. In this embodiment, preferably, the first steel wire rope 6.1.1 and the second steel wire rope 6.1.2 are two parallel steel wire ropes formed by one steel wire rope through the first connecting member 6.2.

[0037] The test probe 2 is provided with a notch for the test probe 3.2 to pass through; the first wire rope 6.1.1 passes around the first fixed pulley 6.3 and is connected to a protective latch plate 7 for covering the notch; the protective latch plate 7 is slidably connected to the outside of the test probe 2 to open and close the notch;

[0038] A camera device 8 is provided above the protective cover 3.1. In the present embodiment, the camera device 8 is provided above the protective cover 3.1 on the inner side of the protective latch plate 7. When the protective latch plate 7 is not opened, the camera device 8 can be protected. When the protective latch plate 7 is fully opened, the camera device 8 is exposed. The camera device 8 is connected to the control terminal signal. The camera device 8 is used to observe the condition of the deep well wall 9 so as to select a relatively flat wall as a measuring point.

[0039] In this embodiment, the second steel wire rope 6.1.2 is connected to the third steel wire rope 6.1.3 and the fourth steel wire rope 6.1.4 via the second connecting member 6.4. Preferably, the third steel wire rope 6.1.3 and the fourth steel wire rope 6.1.4 are two parallel steel wire ropes formed by one steel wire rope via the second connecting member 6.4; the third steel wire rope 6.1.3 is connected to the pull rod 1 3.3.1 on one side of the test probe 3.2 after passing through the second fixed pulley 6.5, and the fourth steel wire rope 6.1.4 is connected to the pull rod 2 3.3.2 on the other side of the test probe 3.2 after passing through the third fixed pulley 6.6.

[0040] In this embodiment, the third steel wire rope 6.1.3 and the fourth steel wire rope 6.1.4 are arranged in parallel, and the pull rod 1 3.3.1 and the pull rod 2 3.3.2 are arranged in parallel on two opposite sides of the test probe 3.2. When the hoisting device pulls the steel wire rope, the third steel wire rope 6.1.3 and the fourth steel wire rope 6.1.4 simultaneously pull the pull rod 1 3.3.1 and the pull rod 2 3.3.2 to achieve the lateral movement of the test probe 3.2.

[0041] In this embodiment, the first fixed pulley 6.3, the second fixed pulley 6.5 and the third fixed pulley 6.6 are all arranged in the test probe 2, and their function is to change the direction of the wire rope; in this embodiment, there are two first fixed pulleys 6.3, and three second fixed pulleys 6.5 and three third fixed pulleys 6.6 are respectively arranged.

[0042] In this embodiment, the first connecting member 6.2 and the second connecting member 6.4 are a wire rope connection structure. In terms of the specific structure, the end of the main wire rope is bent back 180°, parallel to itself and fixed by a lock, and the end of the main wire rope forms a ring structure; the branch wire rope passes through the above-mentioned ring structure, wraps around 180°, and is fixed by a lock to form an interconnected structure.

[0043] In this embodiment, the data storage component 5 includes a control circuit, a storage module and a communication module;

[0044] A heat insulating block 3.5 is disposed on the detection surface 3.2.1 of the test probe 3.2, and a heating wire 3.6 is disposed on the heat insulating block 3.5. The heating wire 3.6 is connected to a control circuit, and the control circuit is connected to a power source.

[0045] Preferably, the insulation block 3.5 is made of tough insulation material, such as vulcanized rubber.

[0046] The heating wire 3.6 is preferably an Archimedean double-helix nickel wire, which can be used as a heating device and also as a resistance temperature sensor; the control terminal controls the power supply to heat the heating wire through the control circuit, and at the same time the storage module collects and stores the resistance change of the resistance temperature sensor, and transmits the collected data to the control terminal through the communication module, processes the collected data, such as eliminating abnormal data, supplementing missing data and data fitting, and outputs a temperature change curve.

[0047] Preferably, the surface of the heating wire 3.6 is covered with an insulating protective film 3.7, and the protective film 3.7 is made of an insulating rigid protective material with good thermal conductivity. The test probe 3.2 provided in this embodiment has a simple structure and is not easily damaged.

[0048] By using the testing device of the utility model, it is possible to test the thermophysical parameters of rocks in different layers under open hole conditions, eliminating the risks brought about by the core sampling process, while saving time and costs; and when conducting in-situ tests, the influence of actual conditions such as temperature and pressure at different depths is taken into account, so that the measured thermophysical parameters of rocks are more in line with the actual situation, thereby improving the accuracy of the measurement data.

[0049] In this embodiment, the test is performed using the test device described above, and the specific steps are as follows:

[0050] 1) The test probe is lowered to the target depth of the deep well by a cable. During the lowering process, the wire rope is in a relaxed state and the spring is in an undeformed state;

[0051] 2) Start the hoisting device and retract the wire rope, wherein the first wire rope drives the protective latch plate to move up, and the second wire rope drives the test probe to move. When the protective latch plate is fully opened, the notch and the camera device on the test probe are completely exposed;

[0052] 3) Start the camera device to take pictures of the inner wall of the deep well and select the measurement point;

[0053] 4) Continue to retract the wire rope, the second wire rope pulls the third and fourth wire ropes, driving the test probe to move out of the gap and close to the wall of the deep well. At this time, the spring is in a stretched state;

[0054] 5) The control terminal controls the power supply to heat the heating wire through the control circuit, and records the measurement data at the same time and stores it in the storage module; the stored measurement data is transmitted to the control terminal through the communication module, and the measurement data is processed, such as the elimination of abnormal data, the supplementation of missing data and data fitting, etc., to generate a temperature change curve; according to the measurement results, the transient thermal conductivity model of the semi-infinite object is used to calculate the thermal physical parameters of the rock, such as thermal conductivity, thermal diffusivity and temperature (the same measurement point is measured 3 times and the average value is taken to reduce the error of the temperature, pressure and water at the measurement point); wherein, the calculation method of the transient thermal conductivity model of the semi-infinite object is a prior art, which can be referred to:

[0055] 【1】Zhang Lixiong, Li Yanning, Nie Qianchao, et al. Design of thermal conductivity tester based on modified plane heat source method[J]. Sensors and Microsystems, 2012, 31(07): 84-87. DOI: 10.13873 / j.1000-97872012.07.037.

[0056] 【2】Zhu Yuxiang. Experimental study on improved transient plane heat source method[D]. Qingdao University of Technology, 2016.

[0057] 6) After the measurement is completed, the winch device loosens the wire rope, the first wire rope is gradually loosened, and the protective latch plate is gradually reset under the action of its own weight; at the same time, the second wire rope is loosened, so that the third and fourth wire ropes are gradually loosened, and the test probe is gradually reset under the action of the spring contraction.

[0058] The test steps provided in this embodiment are simple to operate. It is only necessary to place the test probe close to the wall of the deep wellbore to complete the rock thermal property test through the heating and temperature measurement process. It has a wide range of applications.

[0059] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A spring-type rock in-situ thermal property testing device for deep wells, characterized in that: It comprises a drill rod (1) and a test probe (2) connected in sequence, wherein the drill rod (1) and the test probe (2) are hollow structures and the drill rod (1) and the test probe (2) are connected; a steel cone (2.1) is connected to the bottom of the test probe (2); The test probe (2) is provided with a test component (3), a drive component (4) and a data storage component (5), and the test component (3) is connected to the drive component (4) and the data storage component (5) respectively; It also includes a control terminal and a hoisting device, wherein the control terminal is connected to the data storage component (5); and the hoisting device is connected to the driving component (4); The driving assembly (4) comprises a connecting mechanism (6) for connecting the testing assembly (3) and the hoisting device.

2. The spring-type in-situ thermal property testing device for deep wells according to claim 1 is characterized in that: The test assembly (3) comprises a protective cover (3.1) and a test probe (3.2); the protective cover (3.1) is arranged on the inner wall of the test probe (2); one end of the protective cover (3.1) is provided with an opening; the test probe (3.2) is slidably connected inside the protective cover (3.1); and the detection surface (3.2.1) of the test probe (3.2) faces the opening end of the protective cover (3.1).

3. The spring-type in-situ thermal property testing device for deep wells according to claim 2 is characterized in that: One end of the test probe (3.2) away from the detection surface (3.2.1) is connected to the protective cover (3.1) via a spring (3.4); and pull rods (3.3) are respectively provided on two opposite side surfaces of the test probe (3.2) perpendicular to the detection surface (3.2.1).

4. The spring-type in-situ thermal property testing device for deep wells according to claim 3 is characterized in that: The connection mechanism (6) comprises a steel wire rope (6.1) connected to the hoisting device, and the steel wire rope (6.1) is connected to a first steel wire rope (6.1.1) and a second steel wire rope (6.1.2) via a first connecting member (6.2).

5. The spring-type in-situ thermal property testing device for deep wells according to claim 4 is characterized in that: The test probe (2) is provided with a notch for the test probe (3.2) to pass through; the first steel wire rope (6.1.1) passes around the first fixed pulley (6.3) and is connected to a protective latch plate (7) for covering the notch; the protective latch plate (7) is slidably connected to the outside of the test probe (2) to open and close the notch; A camera device (8) is arranged above the protective cover (3.1), and the camera device (8) is connected to a control terminal signal.

6. The spring-type in-situ thermal property testing device for deep wells according to claim 5 is characterized in that: The second steel wire rope (6.1.2) is connected to the third steel wire rope (6.1.3) and the fourth steel wire rope (6.1.4) via the second connecting piece (6.4); the third steel wire rope (6.1.3) is connected to the pull rod 1 (3.3.1) on one side of the test probe (3.2) after passing around the second fixed pulley (6.5); the fourth steel wire rope (6.1.4) is connected to the pull rod 2 (3.3.2) on the other side of the test probe (3.2) after passing around the third fixed pulley (6.6).

7. The spring-type in-situ thermal property testing device for deep wells according to claim 6 is characterized in that: The data storage component (5) comprises a control circuit, a storage module and a communication module; The detection surface (3.2.1) of the test probe (3.2) is provided with a heat insulating block (3.5), the heat insulating block (3.5) is provided with a heating wire (3.6), the heating wire (3.6) is connected to a control circuit, and the control circuit is connected to a power supply.

8. The spring-type in-situ thermal property testing device for deep wells according to claim 7 is characterized in that: The surface of the heating wire (3.6) is covered with an insulating protective film (3.7).

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