Anti-falling device for reverse rotation of drill rod
By setting toothed grooves and locking components on the drill pipe, the problem of drill pipe uncoupling during reverse rotation is solved, and a fixed connection is achieved when the drill pipe rotates in the opposite direction, avoiding the phenomenon of stuck drill and improving the safety and efficiency of drilling operations.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HANDAN ZHONGXIN GEOTECHNICAL ENGINEERING CO LTD
- Filing Date
- 2025-04-16
- Publication Date
- 2026-05-08
AI Technical Summary
Drill pipes are prone to disengagement when rotating in reverse, leading to stuck drill pipes, economic losses, and safety risks. Existing technologies are insufficient to effectively prevent drill pipes from reversing and falling off.
A drill pipe reversal and anti-disengagement device was designed. By setting toothed grooves on the female drill pipe body and installing a locking assembly inside the male drill pipe body, including an integral rod, a spring, an inner retaining spring and a rotating rod, the spring force is used to lock the locking tongue in the toothed groove, so that the drill pipe can reverse in the same direction without disengaging. When disassembling, the rotating rod rotates 90° around the pin and is supported on the support platform to achieve disengagement.
This technology ensures that the drill pipe does not disengage when rotating in the opposite direction, avoiding stuck drill bits, improving the safety and efficiency of drilling operations, and reducing economic losses.
Smart Images
Figure CN224214128U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of mechanical and engineering technology, specifically, it relates to a drill pipe reversal and anti-fall-off device. Background Technology
[0002] Drill pipe, as a multifunctional industrial device, has a wide range of applications and is often used as an important tool in drilling operations in fields such as oil and gas drilling and geological exploration. Its performance is directly related to operational safety and efficiency, making it an indispensable piece of equipment in the petroleum, energy, and engineering sectors.
[0003] In actual drilling operations, stuck drill pipe frequently occurs due to geological factors, drilling fluid performance issues, and improper human operation. Stuck drill pipe is a common and serious problem in drilling. When dealing with stuck drill pipe, alternating forward and reverse rotation is often used to dislodge it. However, during reverse rotation, the drill string may come off the thread and fall out, causing huge economic losses, safety risks, and environmental hazards to drilling operations.
[0004] In view of this, this utility model is proposed. Utility Model Content
[0005] To solve the above-mentioned technical problems, the basic concept of the technical solution adopted by this utility model is as follows:
[0006] A drill pipe reversal and anti-detachment device includes a female threaded drill pipe body and a male threaded drill pipe body. The female threaded drill pipe body is provided with toothed grooves along the circumference of its cross-section. A female thread is provided at the end of the female threaded drill pipe body.
[0007] The male thread drill rod body is provided with a male thread at its end; a channel is provided inside the male thread drill rod body, and the locking assembly is placed inside the channel; a support platform is provided at the diameter change point of the drill rod body.
[0008] The locking assembly consists of an integral rod, a spring, inner retaining spring one, a hollow cylinder, inner retaining spring two, a pin, and a rotating rod. The spring, inner retaining spring one, hollow cylinder, and inner retaining spring two are sequentially fitted onto the small-diameter cylindrical rod; inner retaining spring one and inner retaining spring two should also be engaged in the slots of the channel.
[0009] The integrated rod consists of a square latch, a large-diameter cylindrical rod, and a small-diameter cylindrical rod. The end of the square latch is a sloping surface.
[0010] The hole is a square hole on the side close to the end face of the male threaded drill rod body to pass through the square locking tongue, and a circular hole away from the end face with the same diameter as the large-diameter cylindrical rod.
[0011] The circular channel is provided with an inner retaining spring slot 1 and an inner retaining spring slot 2.
[0012] Compared with the prior art, the present invention has the following advantages:
[0013] This utility model's drill rod reversal anti-disengagement device has the following features: When the male and female drill rods are connected by rotating in the forward direction, the locking tongue on the integrated rod passes through the channel and contacts the toothed groove on the main body of the female drill rod; during reverse rotation, the locking tongue locks into the toothed groove under spring pressure, ensuring that the male and female drill rods can rotate in the same direction without disengaging; when pulled away from the drill rod joint end face, the rotating rod is pulled out of the circular channel, rotates 90° around the pin shaft, and is supported on the support platform, the locking tongue disengages from the toothed groove, and the male and female drill rods can be disengaged by rotating in the opposite direction, thus achieving free conversion between disassembly and anti-disengagement.
[0014] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings. Attached Figure Description
[0015] In the attached diagram:
[0016] Figure 1 is a schematic diagram of the overall structure of this utility model;
[0017] Figure 2 is a schematic diagram of the AA cross-section of this utility model;
[0018] Figure 3 is a schematic cross-sectional view of the BB of this utility model;
[0019] Figure 4 is a schematic diagram of the CC cross section of this utility model;
[0020] Figure 5 is an enlarged view of 22 in Figure 1.
[0021] In the diagram: 1. Female thread drill rod body; 11. Female thread; 12. Toothed groove; 2. Male thread drill rod body; 21. Male thread; 22. Locking assembly; 221. Integrated rod; 2211. Square locking tongue; 2212. Large diameter cylindrical rod; 2213. Small diameter cylindrical rod; 222. Spring; 223. Inner retaining spring one; 224. Hollow cylinder; 225. Inner retaining spring two; 226. Pin; 227. Rotating rod; 24. Supporting platform; 25. Channel; 26. Square channel; 27. Circular channel; 28. Inner retaining spring one slot; 29. Inner retaining spring two slot. Detailed Implementation
[0022] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate this utility model. Example
[0023] Please refer to Figures 1-5. The figures illustrate a drill pipe reversal and anti-detachment device, which includes a female drill pipe body 1 with toothed grooves 12 around its cross-section and a female thread 11 at its end; a male drill pipe body 2 with a male thread 21 at its end; a support platform 24 at the drill pipe diameter change point; and a channel 25 inside the male drill pipe body 2.
[0024] Referring to Figure 1, the channel 25 has a square channel 26 near the end face of the male thread drill rod body 2 for passing through the square locking tongue 2211, and a circular channel 27 away from the end face with the same diameter as the large-diameter cylindrical rod 2212. It should be noted that the channel 25 is provided so that the locking assembly 22 can pass through it.
[0025] Referring to Figure 5, the locking assembly 22 is composed of an integral rod 221, a spring 222, an inner retaining spring 1 223, a hollow cylinder 224, an inner retaining spring 225, a pin 226, and a rotating rod 227.
[0026] Referring to Figure 5, the integrated rod 221 consists of a square locking tongue 2211, a large-diameter cylindrical rod 2212, and a small-diameter cylindrical rod 2213. It should be noted that the large-diameter cylindrical rod is provided to guide and limit the movement of the square locking tongue 2211.
[0027] When installing the locking assembly 22, first install the integrated rod 221 into the internal channel 25, and then sequentially insert the spring 222, inner retaining spring one 223, hollow cylinder 224, and inner retaining spring two 225 onto the small-diameter cylindrical rod 2213; inner retaining spring one 223 and inner retaining spring two 225 are respectively engaged in the inner retaining spring one slot 28 and inner retaining spring two slot 29. It should be noted here that the inner retaining spring one and inner retaining spring two are set up to fix the hollow cylinder 224 so that it does not move, and to provide recoil force for the spring 222.
[0028] During drilling operations, the female threaded drill pipe body 1 and the male threaded drill pipe body 2 are connected by a rotating upper thread through the female thread 11 and the male thread 21. The square locking tongue 2211 on the locking device 22 contacts the toothed groove 12 on the female threaded drill pipe body 1. Because the end face of the square locking tongue 2211 is inclined, it can rotate freely along the upper threading direction of the toothed groove 12 under the elastic force of the spring 222. It is worth noting that the rotating upper threading connection between the female thread 11 and the male thread 21 is existing technology, and its specific structure and working principle have been mastered by those skilled in the art, so it will not be described in detail here.
[0029] When the drill bit gets stuck, both the male drill rod body 2 and the female drill rod body 1 need to be rotated counterclockwise simultaneously. The square locking tongue 2211 will then lock into the toothed groove 12, providing a locking and fixing function. When it is necessary to release the locking and fixing function, the rotating rod 227 is pulled out of the circular channel 27, rotated 90° around the pin 226, and then supported on the support platform 24. The square locking tongue 2211 disengages from the toothed groove 12, and the male drill rod body 2 can be rotated counterclockwise to disengage from the female drill rod body 1, thus achieving free switching between disassembly and anti-disengagement.
[0030] Working principle: During drilling operations, the male thread drill rod body 2 rotates clockwise to connect with the female thread drill rod body 1 and drills downwards. The square locking tongue 2211 on the locking device 22 contacts the toothed groove 12 on the female thread drill rod body 1. Under the elastic force of the spring 222, the square locking tongue 2211 rotates freely clockwise along the toothed groove 12 with the male thread drill rod body 2. When encountering hard soil layers or sandy soil layers that are prone to collapse and jamming, and it is necessary to rotate counterclockwise to disengage, the square locking tongue 2211 is locked in the toothed groove 12, which plays a locking and fixing role. The male thread drill rod body 2 and the female thread drill rod body 1 can rotate counterclockwise in the same direction without disengaging. When disassembly is required, the operator pulls the rotating rod 227 out of the circular channel 27, rotates it 90° around the pin 226, and then supports it on the support platform 24. The square locking tongue 2211 and the toothed groove 12... To detach, rotate the male drill pipe body 2 counterclockwise to detach it from the female drill pipe body 1. Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A drill pipe reversal anti-fall device, characterized in that: include: The female thread drill rod body (1) has a toothed groove (12) around its end section and a female thread (11) at its end. The male thread drill rod body (2) has a male thread at its end. The male thread drill rod body (2) has a channel (25) inside for inserting a locking assembly (22) and a support platform (24) at the drill rod diameter change point.
2. The drill pipe reversal anti-fall device according to claim 1, characterized in that, The locking assembly (22) consists of an integral rod (221), a spring (222), an inner retaining spring one (223), a hollow cylinder (224), an inner retaining spring two (225), a pin (226), and a rotating rod (227).
3. The drill pipe reversal anti-fall-off device according to claim 2, characterized in that, The integrated rod (221) consists of a square latch (2211), a large-diameter cylindrical rod (2212), and a small-diameter cylindrical rod (2213).
4. The drill pipe reversal anti-fall-off device according to claim 3, characterized in that, The end of the square latch (2211) is a sloping surface.
5. The drill pipe reversal anti-fall device according to claim 1, characterized in that, The hole (25) is a square hole (26) close to the end face of the male thread drill rod body (2) for passing through the square locking tongue (2211), and a circular hole (27) with the same diameter as the large diameter cylindrical rod (2212) away from the end face.
6. The drill pipe reversal anti-fall-off device according to claim 5, characterized in that, The circular channel (27) is provided with an inner retaining spring slot 1 (28) and an inner retaining spring slot 2 (29).