Reinforced anti-falling guide mechanism of horizontal drilling inclinometer

Abstract

The utility model discloses a reinforced horizontal borehole inclinometer anti-drop guide mechanism, which comprises a guide drill short section, a centralizer and a guide shoe, the centralizer is coaxially arranged in the guide drill short section, the guide shoe is coaxially connected to the front end of the centralizer, a guide key is arranged in the guide drill short section, and the guide shoe is coaxially connected to the front end of the centralizer. The guide key is connected with the guide shoe to limit circumferential rotation of the guide shoe; an axial positioning clamping rod is connected to the front end of the centralizer, a clamping mechanism is installed in the guiding drill bit short section and located in front of the guiding key, and the end of the axial positioning clamping rod and the clamping mechanism are detachably connected and axially fixed. The axial positioning clamping rod is arranged to be matched with the clamping mechanism, axial locking of the axial positioning clamping rod is achieved, the guide shoe is effectively prevented from slipping off from the guide key, the connection stability is guaranteed, meanwhile, under the action of the axial positioning clamping rod, the stability of the rear inclinometer can be improved, and it is guaranteed that the rear inclinometer is coaxial with a drill rod or a freezing pipe.

Description

Technical Field

[0001] This utility model relates to the field of horizontal drilling technology. Specifically, it is a reinforced anti-detachment guide mechanism for a horizontal drilling inclinometer. Background Technology

[0002] Currently, when drilling horizontal holes underground, the horizontal inclination and orientation instrument is usually used for drilling. This means that an inclination instrument is installed inside the guide drill bit and moves synchronously with it, so as to detect the drilling azimuth, dip angle and tool face angle in real time, ensuring that drilling is carried out along the designed path.

[0003] Conventional inclinometers typically connect to the guide key inside the guide drill bit via a guide shoe at its front end. During drilling, the guide drill bit rotates continuously, generating vibrations. Due to these vibrations and the inclinometer's own weight, the guide shoe can easily slip off the guide key, causing the tool face angle value to fail and resulting in orientation failure. Utility Model Content

[0004] Therefore, the technical problem to be solved by this utility model is to provide a reinforced horizontal borehole inclinometer anti-detachment guide mechanism that improves the axial connection strength between the inclinometer and the guide drill bit and ensures smooth orientation.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a reinforced horizontal borehole inclinometer anti-detachment guiding mechanism, comprising a guide drill bit section, a stabilizer, and a guide shoe. The stabilizer is coaxially disposed within the guide drill bit section, and the guide shoe is coaxially connected to the front end of the stabilizer. A guide key is disposed within the guide drill bit section, and the guide key is connected to the guide shoe to restrict the circumferential rotation of the guide shoe. An axial positioning rod is connected to the front end of the stabilizer, and a clamping mechanism is installed within the guide drill bit section in front of the guide key. The end of the axial positioning rod is detachably connected to the clamping mechanism to form an axial fixation. Axial fixation is achieved by connecting the axial positioning rod to the clamping mechanism, preventing the guide shoe from slipping off the guide key. The connection between the axial positioning rod and the clamping mechanism is located in front of the guide key. By using a longer axial positioning rod, the swing angle at the connection between the axial positioning rod and the clamping mechanism is reduced when the rear inclinometer wobbles radially, preventing the axial positioning rod from coming off the clamping mechanism. Furthermore, the stability of the rear inclinometer is improved under the action of leverage.

[0006] In the aforementioned reinforced horizontal borehole inclinometer anti-detachment guide mechanism, the axial positioning rod is coaxially mounted inside the guide shoe, with its front end extending from the front end of the guide shoe. The coaxial mounting of the axial positioning rod and the guide shoe ensures that vibrations at any angle transmitted to the connection point with the clamping mechanism are transmitted with relatively uniform amplitude, guaranteeing connection stability.

[0007] The aforementioned reinforced horizontal borehole inclinometer anti-detachment guiding mechanism includes three or more clamping mechanisms arranged circumferentially within the guide drill bit section. The front end of the axial positioning rod is positioned between these three clamping mechanisms and pressed against them. By setting three clamping mechanisms, the axial positioning rod is coaxially aligned with the guide drill bit section, reducing the impact of vibration on the axial positioning rod, significantly improving its stability, and enhancing its axial fixation effect. This also helps improve the coaxiality of the rear inclinometer.

[0008] The aforementioned reinforced horizontal borehole inclinometer anti-detachment guide mechanism has a connecting part at the front end of the axial positioning rod. The connecting part includes a stop ball and a first positioning platform. The stop ball is fixed on the front end of the axial positioning rod, and the first positioning platform is fixed on the axial positioning rod and located behind the stop ball. A groove is provided between the stop ball and the first positioning platform. The clamping mechanism is engaged in the groove.

[0009] The aforementioned reinforced horizontal borehole inclinometer anti-detachment guide mechanism includes a clamping mechanism comprising a fixed base, a spring, and a top block. The fixed base is fixed to the inner wall of the guide drill bit section. The top block is slidably fitted within the fixed base, with one end of the top block extending out of the fixed base. The spring is installed within the fixed base, with one end of the spring connected to the bottom wall of the fixed base and the other end of the spring pressing against the top block. Under the action of the spring, the top block is clamped into a slot.

[0010] In the aforementioned reinforced horizontal borehole inclinometer anti-detachment guide mechanism, the free end face of the top block is a concave arc surface that matches the outer circumferential surface of the slot. The concave arc surface of the free end of the top block can wrap around the outer circumferential surface of the slot, increasing the contact area and further improving the axial connection effect.

[0011] In the aforementioned reinforced horizontal borehole inclinometer anti-detachment guide mechanism, a second positioning platform is fixed on the axial positioning rod on the side of the first positioning platform opposite to the slot. The diameter of the second positioning platform is larger than that of the first positioning platform. The outer circumferential surface of the first positioning platform contacts the end of the fixed base, and the end face of the second positioning platform facing the first positioning platform is in contact with the side wall of the fixed base. The contact between the second positioning platform and the side wall of the fixed base forms a unidirectional rigid positioning, which can limit the axial displacement of the axial positioning rod.

[0012] The aforementioned reinforced horizontal borehole inclinometer anti-detachment guide mechanism has a guide head with a gradually decreasing diameter on the front end face of the axial positioning rod.

[0013] The aforementioned reinforced horizontal borehole inclinometer anti-detachment guide mechanism includes an upper seat and a lower seat. The upper seat is fixed to the guide drill bit section, and the lower seat is fixedly connected to the upper seat by bolts. A baffle is fixedly connected to the fixed end of the top block by screws. The edge of the baffle protrudes from the edge of the top block and slides against the inner wall of the lower seat. A spring supports the upper seat, and the other end of the spring presses against the baffle.

[0014] The aforementioned reinforced horizontal borehole inclinometer anti-detachment guide mechanism has an opening groove along its axial direction on the front end face of the guide shoe, into which the guide key is inserted; an inclined guide surface is provided on the front end face of the guide shoe, and the end of the guide surface is connected to the opening end of the opening groove.

[0015] The technical solution of this utility model has achieved the following beneficial technical effects:

[0016] By setting an axial positioning chuck in conjunction with a clamping mechanism, the axial positioning chuck is axially locked, effectively preventing the guide shoe from slipping off the guide key and ensuring the stability of the connection. At the same time, under the action of the axial positioning chuck, the stability of the rear inclinometer is improved, ensuring that it is coaxial with the drill pipe or freezing pipe. Attached Figure Description

[0017] Figure 1 A schematic diagram of the cross-sectional structure of this utility model along the axial direction of the guide drill bit section;

[0018] Figure 2 A three-dimensional structural diagram of the guide shoe of this utility model;

[0019] Figure 3 A three-dimensional structural diagram of the axial positioning rod of this utility model;

[0020] Figure 4 A cross-sectional view of the guide shoe installed inside the guide drill bit section of this utility model;

[0021] Figure 5 A cross-sectional schematic diagram of the clamping mechanism of this utility model;

[0022] Figure 6 A front view sectional view of the clamping mechanism of this utility model.

[0023] The reference numerals in the figure are as follows: 1-guide drill bit section; 2-duckfoot drill bit; 3-centralizer; 4-guide shoe; 5-opening slot; 6-axial positioning rod; 7-clamping mechanism; 71-upper seat; 72-lower seat; 73-spring; 74-top block; 75-baffle; 76-screw; 8-guide key; 9-guide ramp; 10-slot; 11-stop ball; 12-guide head; 13-first positioning platform; 14-second positioning platform. Detailed Implementation

[0024] This embodiment presents a reinforced horizontal borehole inclinometer anti-detachment guide mechanism, such as... Figure 1 As shown, the system includes a guide drill bit section 1, a stabilizer 3, and a guide shoe 4. The stabilizer 3 is coaxially mounted inside the guide drill bit section 1, and the guide shoe 4 is coaxially connected to the front end of the stabilizer 3. An axial positioning rod 6 is connected to the front end of the stabilizer 3. A clamping mechanism 7 is installed inside the guide drill bit section 1 in front of the guide key 8. The end of the axial positioning rod 6 is detachably connected to the clamping mechanism 7 to form an axial fixation. Figure 2 , Figure 4 As shown, a guide key 8 is provided inside the guide drill bit section 1. An opening groove 5 is formed along its axial direction on the front end face of the guide shoe 4. An inclined guide surface is formed on the front end face of the guide shoe 4, and the end of the guide surface connects with the opening end of the opening groove 5. The guide key 8 is guided into the opening groove 5 by the guide surface. The connection between the guide key 8 and the guide shoe 4 restricts the circumferential rotation of the guide shoe 4, ensuring the accuracy of the tool face angle. The specific structure of the stabilizer 3 is not shown in the figure. The stabilizer 3 is connected to the inclinometer. Under the action of the stabilizer 3, the inclinometer remains coaxial with the drill pipe or freezing pipe.

[0025] like Figure 1 As shown, specifically, the axial positioning rod 6 is coaxially arranged inside the guide shoe 4, and the front end of the axial positioning rod 6 extends from the front end of the guide shoe 4 to the front end of the guide drill bit section 1. The front end of the axial positioning rod 6 has a connecting part. Three or more clamping mechanisms 7 are arranged circumferentially inside the guide drill bit section 1. The connecting part of the front end of the axial positioning rod 6 extends into the three clamping mechanisms 7 and is pressed by the clamping mechanisms 7 to achieve axial locking and satisfy the coaxial setting.

[0026] like Figure 5-6 As shown, the clamping mechanism 7 includes a fixed seat consisting of an upper seat 71 and a lower seat 72, a spring 73, and a top block 74. The upper seat 71 and the lower seat 72 are fixedly connected by bolts. The fixed seat is fixed on the inner wall of the guide drill bit section 1. The lower seat 72 has an opening at one end facing the axis of the guide drill bit section 1. A baffle 75 is fixedly connected to the fixed end of the top block 74 by screws 76. The edge of the baffle 75 protrudes from the edge of the top block 74 and slides within the lower seat 72. The free end of the top block 74 extends out from the opening on the lower seat 72, and the end face of the free end of the top block 74 is a concave arc surface. The spring 73 is supported within the upper seat 71, and the other end of the spring 73 presses against the baffle 75. The spring 73 pushes the top block 74 to clamp the connecting part of the axial positioning rod 6.

[0027] like Figure 3As shown, the connecting part includes a stop ball 11 and a first positioning platform 13. The stop ball 11 is fixed on the front end of the axial positioning rod 6. A guide head 12 with a gradually decreasing diameter is provided on the front end face of the axial positioning rod 6. The first positioning platform 13 is fixed on the axial positioning rod 6 and located behind the stop ball 11. A groove 10 is provided between the stop ball 11 and the first positioning platform 13. The top block 74 is engaged in the groove 10, and the concave arc surface at the end of the top block 74 fits against the outer circumferential surface of the groove 10. Figure 1 , Figure 3 As shown, a second positioning platform 14 is fixed on the axial positioning rod 6 on the side of the first positioning platform 13 away from the slot 10. The diameter of the second positioning platform 14 is larger than the diameter of the first positioning platform 13. The outer circumferential surface of the first positioning platform 13 is in contact with the end of the fixed seat, and the end face of the second positioning platform 14 facing the first positioning platform 13 is in contact with the side wall of the fixed seat.

[0028] In specific operations, such as Figure 1 As shown, the axial positioning rod 6 is fixed to the guide shoe 4 with bolts, and the guide shoe 4 is fixed to the front end of the stabilizer 3. When the stabilizer 3, together with the inclinometer, is sent into the drill pipe and the guide drill bit section 1, the guide key 8 first contacts the guide surface under the action of the guide surface of the guide shoe 4. Since the guide key 8 is fixed, the guide shoe 4 rotates and moves forward under the action of the guide surface until the opening slot 5 is locked on the guide key 8, realizing circumferential fixation. The axial positioning rod 6 is simultaneously connected to the clamping mechanism 7. Specifically... The guide head 12 gradually opens the top blocks 74 of the three clamping mechanisms 7, and the spring 73 is compressed. As the axial positioning rod 6 moves forward, the outer spherical surface of the stop ball 11 continues to open the top blocks 74 until the top blocks 74 enter the slot 10. The two sides of the top blocks 74 are blocked by the stop ball 11 and the first positioning platform 13 respectively, realizing axial connection positioning. The second positioning platform 14 is attached to the side wall of the upper seat 71 to form rigid axial positioning, reducing the lateral force borne by the top blocks 74 and improving the vertical stability of the top blocks 74.

[0029] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of the claims of this patent application.

Claims

1. A reinforced anti-detachment guiding mechanism for a horizontal borehole inclinometer, comprising a guide drill bit section (1), a stabilizer (3), and a guide shoe (4), wherein the stabilizer (3) is coaxially disposed within the guide drill bit section (1), and the guide shoe (4) is coaxially connected to the front end of the stabilizer (3), characterized in that, The guide drill bit short section (1) is provided with a guide key (8) connected with the guide shoe (4) to limit the circumferential rotation of the guide shoe (4); the front end of the centralizer (3) is connected with an axial positioning clamping rod (6), and the guide drill bit short section (1) is provided with a clamping mechanism (7) in front of the guide key (8), and the end of the axial positioning clamping rod (6) is detachably connected with the clamping mechanism (7) and forms axial fixation.

2. A retention guide for a reinforced horizontal borehole inclinometer as defined in claim 1, wherein, The axial positioning clamping rod (6) is coaxially arranged in the guide shoe (4), and the front end of the axial positioning clamping rod (6) extends from the front end of the guide shoe (4).

3. The anti-unscrewing guide of a reinforced horizontal borehole inclinometer as claimed in claim 1, wherein, The guide drill bit short section (1) is provided with more than three clamping mechanisms (7) arranged in the circumferential direction, and the front end of the axial positioning clamping rod (6) is arranged between the three clamping mechanisms (7) and is pressed by the clamping mechanisms (7).

4. A retention guide for a reinforced horizontal borehole inclinometer according to any one of claims 1 to 3, wherein: The front end of the axial positioning clamping rod (6) has a connecting portion including a ball stop (11) and a first positioning table (13), the ball stop (11) is fixed on the front end of the axial positioning clamping rod (6), the first positioning table (13) is fixed on the axial positioning clamping rod (6) and located behind the ball stop (11), and a clamping groove (10) is formed between the ball stop (11) and the first positioning table (13); the clamping mechanism (7) is clamped in the clamping groove (10).

5. A retention guide for a reinforced horizontal borehole inclinometer as defined in claim 4, wherein, The clamping mechanism (7) includes a fixed seat, a spring (73) and a top block (74), the fixed seat is fixed on the inner wall of the guide drill bit short section (1), the top block (74) is slidingly fitted in the fixed seat and one end of the top block (74) penetrates through the fixed seat, the spring (73) is installed in the fixed seat, one end of the spring (73) is connected with the bottom wall of the fixed seat, and the other end of the spring (73) abuts against the top block (74), and the top block (74) is clamped in the clamping groove (10) under the action of the spring (73).

6. A hold down guide for a reinforced horizontal borehole inclinometer as defined in claim 5, wherein, The free end face of the top block (74) is an inner concave arc surface matched with the outer circumferential surface of the clamping groove (10).

7. A hold down guide for a reinforced horizontal borehole inclinometer as defined in claim 5, wherein, A second positioning table (14) is fixed on the side of the axial positioning clamping rod (6) away from the clamping groove (10), the diameter of the second positioning table (14) is greater than that of the first positioning table (13), the outer circumferential surface of the first positioning table (13) is in contact with the end of the fixed seat, and the end face of the second positioning table (14) towards the first positioning table (13) is in contact with the side wall surface of the fixed seat.

8. The anti-unscrewing guide of a reinforced horizontal borehole inclinometer according to claim 5, wherein, The front end face of the axial positioning clamping rod (6) is provided with a guide head (12) with gradually decreasing diameter.

9. The anti-unscrewing guide of a reinforced horizontal borehole inclinometer according to claim 5, wherein, The fixed seat comprises an upper seat (71) fixed on the pilot drill short section (1) and a lower seat (72) fixedly connected with the upper seat (71) through bolts, a fixed end of the top block (74) is fixedly connected with a baffle (75) through a screw (76), the edge of the baffle (75) protrudes the edge of the top block (74), the edge of the baffle (75) is in sliding fit with the inner wall of the lower seat (72), the spring (73) is supported in the upper seat (71), and the other end of the spring (73) is pressed against the baffle (75).

10. The anti-backout guiding mechanism for a reinforced horizontal borehole inclinometer as claimed in claim 1, wherein, An open slot (5) is formed on the front end face of the guide shoe (4) along the axial direction, and the guide key (8) is clamped into the open slot (5); an inclined guide surface is formed on the front end face of the guide shoe (4), and the end of the guide surface is connected with the opening end of the open slot (5).

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