A temperature measuring drill rod for underground coal mine based on temperature measuring optical fiber and its use method

Abstract

The present invention discloses a temperature measuring drill rod for coal mines based on temperature measuring optical fiber and a method for using the same. The drill rod comprises an internally penetrated drill rod; the end of the first end of the drill rod is open; a detachable sealing part for blocking the opening is provided at the opening of the second end of the drill rod; a guide hole for accommodating the temperature measuring optical fiber to freely pass through is provided on the side wall or sealing part of the second end; the free end of the temperature measuring optical fiber deep into the drill rod is detachably connected to a push block smaller than the inner diameter of the drill rod; the effective cross-sectional area of ​​the push block accounts for 80% to 95% of the cross-sectional area of ​​the inner diameter of the drill rod; a high-pressure fluid inlet pressurization port is provided on the side wall or sealing part of the second end, and the pressurization port is communicated with an external fluid pressure source. The present invention uses a drill rod with a special structure, in combination with an optical fiber temperature detector and a temperature measuring optical fiber, to determine the location of the high-temperature coal seam by actually detecting the peak position of the temperature in the borehole, and can also drill holes at the same time, thus realizing multiple uses of one drill rod.

Description

Technical Field

[0001] The invention relates to the field of temperature measurement of coal seams in mines, and in particular to an underground temperature measurement drill rod in coal mines based on a temperature measurement optical fiber and a use method thereof. Background Art

[0002] In coal mine fire area monitoring, determination of coal spontaneous combustion range, early prevention, forecasting and other related projects, the collection of internal information of the fire area is the most critical technology. At present, the borehole temperature information of the fire area has a high guiding significance for the precise positioning of the local high-temperature fire source.

[0003] The commonly used borehole temperature measurement devices are mainly composed of thermal resistor / thermocouple temperature measurement probes, data transmission wires and display instruments. The wires for optical fiber temperature measurement are mainly armored wires and non-armored wires; but each wire will have different problems in actual use.

[0004] When using armored wires, the hardness of the armored wires can be used to directly transport the temperature probe into the borehole. The transport depth needs to be calculated manually. Although the armored wires can be directly transported into the borehole, the hard armored wires are not easy to carry, so most of the time they are only suitable for short-distance temperature measurement. Although non-armored wires are easy to carry, when measuring temperature, it is necessary to use tape to tie the sensitive temperature probe and the signal line to the hard transport wire, deliver the temperature probe into the borehole, and calculate the depth based on the number of tape wrapping points on the wire. This process is complicated, and as the wire goes deeper, it is easier to bend, and the bent wire will also affect the actual depth of the detection. Therefore, in actual operation, both methods have different advantages and disadvantages. Summary of the invention

[0005] In order to solve the two current wire problems, the present invention provides a temperature measuring drill rod for underground coal mines based on temperature measuring optical fiber and a method for using the same.

[0006] In order to achieve the above object, the present invention adopts the following technical solution:

[0007] A temperature measuring drill rod for underground coal mines based on temperature measuring optical fiber, comprising an internally penetrated drill rod;

[0008] The end of the first end of the drill rod is open; the opening of the second end of the drill rod is provided with a detachable sealing part for blocking the opening;

[0009] A guide hole for accommodating the temperature measuring optical fiber to freely pass through is provided on the side wall or the sealing part of the second end; the free end of the temperature measuring optical fiber penetrating into the drill rod is detachably connected to a push block whose size is smaller than the inner diameter of the drill rod; the effective cross-sectional area of ​​the push block accounts for 80% to 95% of the cross-sectional area of ​​the inner diameter of the drill rod;

[0010] A pressurizing port for high-pressure fluid to enter is provided on the second end side wall or the sealing portion, and the pressurizing port is communicated with an external fluid pressure source.

[0011] Furthermore, the pressurizing port is arranged on the side wall of the second end, and a pressurizing pipe connected to a fluid pressure source is extended and fixed to the pressurizing port.

[0012] Furthermore, the sealing portion is a detachable end cover, and the guide hole is arranged on the end cover.

[0013] Furthermore, the guide hole is arranged on the side wall of the second end.

[0014] Preferably, the fluid includes: gas or liquid. More preferably, the liquid is: water.

[0015] In one implementation mode of the present invention, the opening of the first end is detachably connected to a drill bit with a cooling hole, and the cooling hole is communicated with a hollow cavity in the drill rod.

[0016] Furthermore, the inner diameter of the drill rod is circular; and the push block is a cylindrical or spherical structure.

[0017] A method for using a temperature measuring drill rod in a coal mine based on a temperature measuring optical fiber according to the present invention comprises the following steps:

[0018] a1) Extend the first end of the drill rod into the drilled hole.

[0019] a2) Pass the temperature measuring optical fiber that is not connected to the push block through the guide hole, and then connect the push block to the free end of the temperature measuring optical fiber.

[0020] a3) Push the push block into the drill pipe, and then seal the open end of the second end with the sealing part.

[0021] a4) Use external high-pressure fluid to pour in from the pressurization port, and let the push block drive the temperature measuring optical fiber to move towards the first end.

[0022] a5) After the movement stops, start the temperature measuring device connected to the temperature measuring optical fiber, measure the temperature distribution along the entire drill pipe through the temperature measuring optical fiber and determine the temperature peak.

[0023] Another method of using a temperature measuring drill rod for underground coal mines based on a temperature measuring optical fiber after adding a drill bit is provided, characterized in that it comprises the following steps:

[0024] b1), the second end including the pressurizing port and the sealing part is disassembled, and the drill bit of the first end is driven by the drilling equipment to drill a hole in the coal seam until it stops at the target depth.

[0025] b2) Cancel the mechanical connection between the drill rod and the drilling equipment.

[0026] b3), connecting the second end including the pressurization port and the sealing portion to the exposed free end of the drill pipe in step b1).

[0027] b4) Pass the temperature measuring optical fiber that is not connected to the push block through the guide hole, and then connect the push block to the free end of the temperature measuring optical fiber.

[0028] b5) Push the push block into the drill pipe and seal the open end of the second end with the sealing part.

[0029] b6) Use external high-pressure fluid to pour in from the pressurization port, and let the push block drive the temperature measuring optical fiber to move towards the first end.

[0030] b7) Use external high-pressure fluid to be injected from the pressurized port, and the impact push block drives the temperature measuring optical fiber to move toward the first end.

[0031] b8) After the movement stops, the temperature measuring device connected to the temperature measuring optical fiber is started to measure the temperature distribution along the entire section of the drill pipe (1) through the temperature measuring optical fiber (2) and determine the temperature peak value.

[0032] Compared with the prior art, the present invention has the following beneficial effects: the present invention uses a drill rod with a special structure, in combination with an optical fiber thermometer and a temperature measuring optical fiber, to determine the location of the high-temperature coal seam by actually detecting the peak position of the temperature in the borehole; at the same time, due to the special structure of the drill rod and related structures, not only can the hole be drilled but also the accurate position can be determined, thus realizing multiple uses of one drill rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 The present invention is a schematic structural diagram of a temperature measuring drill rod in an underground coal mine based on a temperature measuring optical fiber.

[0034] In the figure, 1 is a drill rod, 11 is a first end, 12 is a second end, 2 is a temperature measuring optical fiber, 21 is a push block, 3 is a sealing part, 31 is a guide hole, 4 is a pressurizing port, 41 is a pressurizing tube, 5 is a drill bit, and 51 is a cooling hole. DETAILED DESCRIPTION

[0035] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] like Figure 1 As shown, a temperature measuring drill rod for underground coal mine based on temperature measuring optical fiber comprises a drill rod 1 which is internally penetrated; the end of the first end 11 of the drill rod 1 is open; a removable sealing part 3 for blocking the opening is provided at the opening of the second end 12 of the drill rod 1, wherein the sealing part 3 is a removable end cap or other sealing structure, more specifically, a sealing cap connected by threads or clamps. A guide hole 31 for accommodating the temperature measuring optical fiber 2 to pass freely is provided on the side wall of the second end 12 or the sealing part 3, and the specific installation position of the guide hole 31 can be set on the side wall of the second end 12, or can also be set on the sealing part 3, as shown in FIG. Figure 1As shown in , the sealing portion 3 is a detachable end cover, and the guide hole 31 is provided on the end cover.

[0037] The free end of the temperature measuring optical fiber 2 inserted into the drill rod 1 is detachably connected to a push block 21 whose size is smaller than the inner diameter of the drill rod 1; wherein the effective cross-sectional area of ​​the push block 21 accounts for 80% to 95% of the inner diameter cross-sectional area of ​​the drill rod 1; a push block 21 with too small effective cross-sectional area is difficult to pull the movement of the temperature measuring optical fiber 2; and a push block 21 with a larger effective cross-sectional area is not conducive to sliding in the drill rod 1. Figure 1 As shown, the inner diameter of the drill rod 1 is circular; and the push block 21 is a cylindrical or spherical structure.

[0038] A pressurizing port 4 for high-pressure fluid to enter is provided on the side wall of the second end 12 or the sealing portion 3, and the pressurizing port 4 is communicated with an external fluid pressure source. The fluid used for driving can be gas or liquid, and specifically, the liquid can be water. The pressurizing port 4 can also be provided on the side wall of the second end 12, and a pressurizing pipe 41 connected to the fluid pressure source is extended and fixed to the pressurizing port 4. The pressurizing pipe 41 communicates with an external fluid pressure source.

[0039] The method of using the device can be carried out according to the following steps:

[0040] a1), extending the first end 11 of the drill rod 1 into the drilled hole.

[0041] a2), pass the temperature measuring optical fiber 2 which is not connected to the push block 21 through the guide hole 31, and then connect the push block 21 to the free end of the temperature measuring optical fiber 2. As described above, the installation position of the guide hole 31 can be on the side wall of the second end 12, or can be set on the sealing part 3. Before fixing the push block 21 to the temperature measuring optical fiber 2, it needs to pass through the guide hole 31 first.

[0042] a3), push the push block 21 into the drill rod 1, and then use the sealing part 3 to seal the open part of the second end 12.

[0043] a4) Use external high-pressure fluid to be poured in from the pressurization port 4, so that the push block 21 drives the temperature measuring optical fiber 2 to move toward the first end 11. The high-pressure fluid pushes the push block 21 to move directly to the open part of the first end 11. Using high-pressure fluid instead of the manual wire pushing method can make the movement of the temperature measuring optical fiber 2 more stable and not easy to bend.

[0044] a5) After the movement stops, the temperature measuring device connected to the temperature measuring optical fiber 2 is started to measure the temperature distribution along the entire section of the drill pipe 1 through the temperature measuring optical fiber (2) and determine the temperature peak value.

[0045] In the present invention, after the temperature measuring optical fiber 2 reaches the pre-position, the temperature in the coal seam will enter the interior of the drill rod 1 in the form of thermal radiation, and then affect the temperature measuring optical fiber 2. In the present invention, although the hollowness in the drill rod 1 allows the heat to diffuse faster. However, since the heat source of the coal seam is continuous, and the highest temperature in the drill rod 1 will not exceed the highest temperature of the coal seam, the temperature measuring device connected by the temperature measuring optical fiber 2 and the temperature measuring optical fiber 2 can still detect the temperature distribution in a certain area in the drill rod 1, determine the position of the highest temperature relative to the surrounding low temperature, and judge the position of the coal seam with high temperature and flammable points relative to the drill rod 1.

[0046] When measuring temperature using this method, it is necessary to drill holes in advance before actual testing. Another embodiment can be used:

[0047] Another embodiment: The opening of the first end 11 is detachably connected to a drill bit 5 with a cooling hole 51, and the cooling hole 51 is connected to the hollow cavity in the drill rod 1. The cooling hole 51 can not only be used for cooling during drilling, but also can be used for high-pressure fluid to push the push block 21 to move. The specific method of use includes the following steps:

[0048] b1), the second end 12 including the pressurizing port 4 and the sealing part 3 is disassembled, and the drill bit 5 of the first end 11 is driven by a drilling device to drill a hole in the coal seam until it stops at a target depth.

[0049] b2) Cancel the mechanical connection between the drill rod 1 and the drilling equipment.

[0050] b3), connect the second end 12 including the pressurizing port 4 and the sealing part 3 to the free end of the drill pipe 1 exposed in step b1. Through the above three steps, a borehole is drilled in the coal seam using the drill bit 5, and the drill pipe 1 then becomes a movement channel for the temperature measuring optical fiber 2.

[0051] b4), passing the temperature measuring optical fiber 2 which is not connected to the push block 21 through the guide hole 31, and then connecting the push block 21 to the free end of the temperature measuring optical fiber 2.

[0052] b5), push the push block 21 into the drill rod 1, and seal the open portion of the second end 12 with the sealing portion 3.

[0053] b6) Use external high-pressure fluid to be injected from the pressurizing port 4, so that the push block 21 drives the temperature measuring optical fiber 2 to move toward the first end 11.

[0054] b7) Use external high-pressure fluid to be poured in from the pressurizing port 4 to impact the push block 21 and drive the temperature measuring optical fiber 2 to move toward the first end 11.

[0055] b8) After the movement stops, the temperature measuring device connected to the temperature measuring optical fiber 2 is started, and the temperature distribution along the entire section of the drill pipe 1 is measured through the temperature measuring optical fiber 2 to determine the temperature peak value.

[0056] In summary, in another embodiment, due to the addition of the drill bit 5, the drill rod 1 can directly become the movement channel of the push block 21; thereby eliminating the tedious process of pulling out and then putting back the drill rod 1 without the drill bit 5.

Claims

1. A temperature measuring drill rod for underground coal mines based on temperature measuring optical fiber, characterized in that: It comprises a drill rod (1) which penetrates the inside; The end of the first end (11) of the drill rod (1) is open; the open end of the second end (12) of the drill rod (1) is provided with a detachable sealing portion (3) for blocking the open end, the sealing portion (3) is a detachable end cover, and the guide hole (31) is provided on the end cover; A guide hole (31) for accommodating the temperature measuring optical fiber (2) to freely pass through is provided on the side wall of the second end (12) or the sealing portion (3); the free end of the temperature measuring optical fiber (2) that penetrates into the drill rod (1) is detachably connected to a push block (21) whose size is smaller than the inner diameter of the drill rod (1); the effective cross-sectional area of ​​the push block (21) accounts for 80% to 95% of the cross-sectional area of ​​the inner diameter of the drill rod (1); a pressurizing port (4) is provided on the side wall of the second end (12), and a pressurizing pipe (41) connected to a fluid pressure source is extended and fixed to the pressurizing port (4); A pressurizing port (4) for high-pressure fluid to enter is provided on the side wall or the sealing portion (3) of the second end (12), and the pressurizing port (4) is connected to an external fluid pressure source; The opening of the first end (11) is detachably connected to a drill bit (5) having a cooling hole (51), and the cooling hole (51) is in communication with a hollow cavity in the drill rod (1); The inner diameter of the drill rod (1) is circular, and the push block (21) is a cylindrical or spherical structure; The use of the temperature measuring drill rod in coal mines based on the temperature measuring optical fiber is as follows: b1), disassembling the second end (12) including the pressurizing port (4) and the sealing portion (3), and driving the drill bit (5) of the first end (11) to drill a hole in the coal seam by means of a drilling device until the hole stops at a target depth; b2) cancelling the mechanical connection between the drill rod (1) and the drilling equipment; b3), connecting the second end (12) including the pressurizing port (4) and the sealing portion (3) to the exposed free end of the drill pipe (1) in step b1); b4), passing the temperature measuring optical fiber (2) not connected to the push block (21) through the guide hole (31), and then connecting the push block (21) to the free end of the temperature measuring optical fiber (2); b5), pushing the push block (21) into the drill rod (1), and then sealing the open portion of the second end (12) with the sealing portion (3); b6) injecting external high-pressure fluid from the pressure port (4) so ​​that the push block (21) drives the temperature measuring optical fiber (2) to move toward the first end (11); b7), injecting external high-pressure fluid from the pressure port (4) to impact the push block (21) and drive the temperature measuring optical fiber (2) to move toward the first end (11); b8) After the movement stops, the temperature measuring device connected to the temperature measuring optical fiber (2) is started, and the temperature distribution along the entire section of the drill pipe (1) is measured through the temperature measuring optical fiber (2) to determine the temperature peak value.

2. The temperature measuring drill rod for underground coal mine based on temperature measuring optical fiber according to claim 1, characterized in that: The guide hole (31) is arranged on the side wall of the second end (12).

3. The temperature measuring drill rod for underground coal mine based on temperature measuring optical fiber according to claim 1, characterized in that: The fluid includes: gas or liquid.

4. The temperature measuring drill rod for underground coal mine based on temperature measuring optical fiber according to claim 3, characterized in that: The liquid is: water.

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