A mud-pumping type in-hole testing device for engineering geological exploration of horizontal directional drilling

Abstract

The present invention discloses an in-hole testing device for engineering geological exploration of slurry pressure-fed horizontal directional drilling, comprising a drilling tool, which includes a double-wall drill pipe having an outer wall and an inner wall coaxial with and spaced from the outer wall; an overall mechanism of the testing device, located inside the inner cavity of the double-wall drill pipe, which includes a central rod and a testing device connected to the bottom end of the central rod through a bearing; a sealing and pressure-feeding mechanism, located between the inner wall of the double-wall drill pipe and the central rod; and an in-place reporting mechanism, located between the inner wall of the double-wall drill pipe and the central rod and adjacent to the sealing and pressure-feeding mechanism, which includes a suspension seat ring fixedly connected to the inner wall of the double-wall drill pipe and a valve plug connected to the suspension seat ring through a spring pin. The structure of the present invention is simple and the design is reasonable. It can complete in-hole testing without pulling out the drill in a horizontal directional exploration hole, and use the slurry pressure to push the whole device to the bottom of the hole for testing.

Description

Technical Field

[0001] The present invention relates to the technical field of engineering geological exploration equipment for horizontal directional drilling, and particularly relates to a downhole testing device for engineering geological exploration of horizontal directional drilling with mud pumping. Background Art

[0002] At present, with the development needs of engineering geological exploration of mountain tunnels in high-altitude areas, engineering geological exploration is not only limited to vertical holes, but has been extended to horizontal directional holes. The traditional downhole testing device for vertical holes cannot be directly applied to horizontal holes, and there are the following problems:

[0003] (1) Directly connecting the testing instrument to the front end of the drill pipe cannot ensure the safety of the instrument during the drilling and testing process.

[0004] (2) Generally, the horizontal borehole is long, and it takes a lot of time for the testing to trip in and out and for the testing instrument to thread through the drill pipe.

[0005] Therefore, it is necessary to provide a downhole testing device for engineering geological exploration of horizontal directional drilling with mud pumping to solve the problem that the traditional downhole testing device for vertical holes cannot be directly applied to horizontal holes. Summary of the Invention

[0006] Based on the deficiencies of the existing technology, the technical problem to be solved by the present invention is to provide a downhole testing device for engineering geological exploration of horizontal directional drilling with mud pumping, which has a simple structure and reasonable design, can complete downhole testing without pulling out the drill in the horizontal directional exploration hole, and uses the mud pressure to push the whole device to the bottom of the hole for testing.

[0007] To achieve the above object, the present invention adopts the following technical measures:

[0008] A mud pressure-feeding horizontal directional drilling engineering geological survey hole testing device, comprising a drilling tool, which comprises a double-walled drill rod, the double-walled drill rod having an outer wall and an inner wall coaxial with the outer wall and spaced apart; an overall testing device mechanism, located in the inner cavity of the double-walled drill rod, comprising a center rod, and a testing device connected to the bottom end of the center rod through a bearing; a sealing pressure-feeding mechanism, located between the inner wall of the double-walled drill rod and the center rod; an in-place alarm mechanism, located between the inner wall of the double-walled drill rod and the center rod and adjacent to the sealing pressure-feeding mechanism, comprising a suspension seat ring fixedly connected to the inner wall of the double-walled drill rod, and a suspension seat ring connected to the suspension seat ring through a spring pin. A valve plug connected to a seat ring; the double-wall drill pipe is provided with a first water inlet, a second water inlet and a third water inlet connecting its internal cavity with the gap between the inner wall and the outer wall, the first water inlet is located above the sealing pressure-feeding mechanism, and the second water inlet and the third water inlet are located above and below the valve plug respectively; the mud is pressed through the testing device to the testing position by applying pressure to the sealing pressure-feeding mechanism, the mud enters the gap between the inner wall and the outer wall of the double-wall drill pipe through the first water inlet, and then enters the top valve plug through the second water inlet, and then enters the gap of the double-wall drill pipe again through the third water inlet. During the whole process, the mud pressure first rises and then falls, and the test starts after the testing device is in place.

[0009] Preferably, the overall structure of the testing device further comprises a spearhead connected to the top end of the central rod, which is used to cooperate with a salvaging device to remove the entire testing device from the borehole after the test is completed.

[0010] Furthermore, the sealing and pressing mechanism includes two sealing clamps and a sealing gasket located therebetween, which is used to pressurize the test device by pumping mud; the sealing clamp located at the bottom abuts against the suspension seat ring.

[0011] Optionally, an integrated cable groove is provided inside the central rod for inserting integrated cables of the testing instrument; a sealing cap for waterproofing is provided at the upper end of the integrated cable groove.

[0012] Furthermore, the top of the double-wall drill pipe is threadedly connected to a single-wall drill pipe via a joint.

[0013] Optionally, a drill bit is connected to the bottom of the double-wall drill pipe, and a stabilizing ring is provided inside the double-wall drill pipe near the bottom thereof.

[0014] Furthermore, the lower part of the testing device is connected to a conical head for removing obstacles at the front end of the drill bit.

[0015] As described above, the in-hole testing device for engineering geological exploration of slurry-pressurized horizontal directional drilling according to the present invention has a simple structure. It can complete in-hole testing without pulling out the drill in the horizontal directional exploration hole. The whole device is pushed to the bottom of the hole by the slurry pressure for testing. After the testing is completed, the whole device can be taken out by using the fishing device in cooperation with the fishing spear head, which can well meet the relevant in-hole testing work of the horizontal directional exploration hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 FIG. is a schematic structural diagram of the in-hole testing device for engineering geological exploration of slurry-pressurized horizontal directional drilling according to a preferred embodiment of the present invention.

[0017] Wherein: 1 - single-wall drill pipe, 2 - fishing spear head, 3 - joint, 4 - double-wall drill pipe, 5 - integrated cable, 6 - sealing cap, 7 - first water port, 8 - sealing clamp plate, 9 - sealing gasket, 10 - suspension seat ring, 11 - integrated cable groove, 12 - spring pin, 13 - second water port, 14 - valve plug, 15 - third water port, 16 - center rod, 17 - centralizer, 18 - drill bit, 19 - bearing, 20 - testing device, 21 - tapered head. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] The following will refer to Figure 1 for a detailed description of the in-hole testing device for engineering geological exploration of slurry-pressurized horizontal directional drilling according to the present invention.

[0019] As Figure 1 shown, the in-hole testing device for engineering geological exploration of slurry-pressurized horizontal directional drilling provided by the present invention includes a drill string, a sealing and pressing mechanism, a reaching notification mechanism, and an overall testing device mechanism. Among them, the drill string includes a single-wall drill pipe 1, a double-wall drill pipe 4, a centralizer 17, and a drill bit 18. The drill bit 18 is connected to the bottom of the double-wall drill pipe 4. The centralizer 17 is located inside the double-wall drill pipe 4 and near its bottom. The single-wall drill pipe 1 and the double-wall drill pipe 4 are threadedly connected through a joint 3. The single-wall drill pipe 1 is a conventional drill pipe for horizontal directional drilling rigs.

[0020] The sealing and pressing mechanism includes two sealing clamp plates 8 and a sealing gasket 9 located between them, and is used to pump slurry through the drill pipe to press the testing device 20.

[0021] The reaching notification mechanism of the present invention includes a suspension seat ring 10, a first water port 7, a second water port 13, a third water port 15, a valve plug 14, and a spring pin 12 for stretching and adjusting the up and down movement of the valve plug 14. The reaching notification mechanism realizes that when the device reaches the bottom of the borehole, it judges that the device has reached the bottom by the change of slurry pressure, so as to realize the reaching notification of the device. The valve plug 14 is connected to the spring pin 12. The slurry flushes the valve plug 14 to realize the up and down movement of the valve plug 14, changing the water path and causing the change of slurry pressure.

[0022] The overall mechanism of the test device of the present invention includes a spearhead 2, a comprehensive cable 5, a sealing cap 6, a comprehensive cable groove 11, a central rod 16, a bearing 19, a test device 20, and a tapered head 21. The lower part of the test device 20 is connected to the above-mentioned tapered head 21, which is used to remove the obstacles in front of the drill bit 18 at the front end of the hole. The upper end of the central rod 16 of the overall mechanism of the test device is provided with the above-mentioned spearhead 2, which is used to cooperate with the fishing device to take out the whole test device from the drill hole after the test. The inside of the central rod 16 is provided with a comprehensive cable groove 11 for threading the comprehensive cable 5 of the test instrument. In addition, a sealing cap 6 is provided at the upper end of the comprehensive cable groove 11 for waterproofing. The lower part of the central rod 16 of the overall mechanism of the test device is connected to the test device 20 through a bearing 19, so that the test device 20 is not affected by factors such as the rotation of the drill pipe.

[0023] Next, with reference to Figure 1 and in combination with the above structural description, the working process of the in-hole test device for mud-pumping horizontal directional drilling engineering geological exploration of the present invention will be briefly described:

[0024] a. Connect the whole device to the drill pipe of the horizontal directional drilling rig, turn on the mud pump to pump mud into the drill pipe, and use the mud pressure to press the whole device into the bottom of the drill hole. When the whole device reaches the bottom of the drill hole, the mud enters the gap between the double-wall drill pipes 4 through the first water port 7, and then enters the drill tool top valve plug 14 through the second water port 13, and then enters the gap between the double-wall drill pipes 4 again through the third water port 15. The in-place reporting mechanism comes into play. During the whole process, the mud pressure first rises and then falls. After the device is in place, the test starts;

[0025] b. After the test is completed, use the fishing device to cooperate with the spearhead 2 to take out the whole device;

[0026] c. When the test needs to be carried out again, install the whole device into the drill pipe, and repeat steps a and b until the test is completed.

[0027] The above is only the specific implementation manner in the present invention, but the protection scope of the present invention is not limited thereto. Any transformation or replacement that can be understood by those familiar with the technology within the technical scope disclosed by the present invention should be covered within the scope of the present invention.

Claims

1. A mud pressure-feed horizontal directional drilling engineering geological survey hole testing device, It is characterized in that include: A drilling tool, comprising a double-wall drill pipe having an outer wall and an inner wall coaxial with the outer wall and spaced apart from the outer wall; The overall structure of the testing device is located in the inner cavity of the double-wall drill pipe, and includes a center rod and a testing device connected to the bottom end of the center rod through a bearing; A sealed pressure-feeding mechanism, located between the inner wall of the double-wall drill pipe and the center rod; An in-place alarm mechanism is located between the inner wall of the double-wall drill pipe and the center rod and is disposed adjacent to the sealing pressure-feeding mechanism, and comprises a suspension seat ring fixedly connected to the inner wall of the double-wall drill pipe and a valve plug connected to the suspension seat ring via a spring pin; The double-wall drill pipe is provided with a first water inlet, a second water inlet and a third water inlet which are connected to the gap between the inner cavity and the inner wall and the outer wall. The first water inlet is located above the sealing pressure-feeding mechanism, and the second water inlet and the third water inlet are located above and below the valve plug, respectively. The mud is pressed and sent to the test device to the test position by applying pressure to the sealing pressure mechanism. The mud enters the gap between the inner wall and the outer wall of the double-wall drill pipe through the first water inlet, and then enters the top valve plug through the second water inlet, and then enters the gap of the double-wall drill pipe through the third water inlet again. During the whole process, the mud pressure first rises and then falls. The test starts after the test device is in place; The sealing and pressing mechanism comprises two sealing clamping plates and a sealing gasket located therebetween, and is used for pressing the test device by pumping mud; The sealing clamping plate located below abuts against the suspension seat ring; The overall structure of the testing device also includes a spearhead connected to the top of the central rod, which is used to cooperate with the salvaging device to remove the entire testing device from the borehole after the test is completed.

2. A mud pressure-feeding horizontal directional drilling engineering geological survey in-hole testing device according to claim 1, It is characterized in that An integrated cable groove is provided inside the central rod for inserting integrated cables of the testing instrument; a sealing cap for waterproofing is provided at the upper end of the integrated cable groove.

3. A mud pressure-feeding horizontal directional drilling engineering geological survey in-hole testing device according to claim 1, It is characterized in that The top of the double-wall drill pipe is threadedly connected with a single-wall drill pipe via a joint.

4. A mud pressure-feeding horizontal directional drilling engineering geological survey in-hole testing device according to claim 1, It is characterized in that A drill bit is connected to the bottom of the double-wall drill pipe, and a stabilizing ring is arranged inside the double-wall drill pipe near the bottom.

5. A mud pressure-feeding horizontal directional drilling engineering geological survey in-hole testing device according to claim 4, It is characterized in that The lower part of the testing device is connected to a conical head for removing obstacles at the front end of the drill bit.

Images