CN219733314U

CN219733314U - Drill rod

Info

Publication number: CN219733314U
Application number: CN202320834645.XU
Authority: CN
Inventors: 史姗; 栗宗明; 曹晨
Original assignee: Shaanxi Taihe Intelligent Drilling Co ltd
Current assignee: Shaanxi Taihe Intelligent Drilling Co ltd
Priority date: 2023-04-14
Filing date: 2023-04-14
Publication date: 2023-09-22
Anticipated expiration: 2033-04-14

Abstract

The utility model discloses a drill rod, which comprises a drill rod pipe body, an annular unloading groove, an inner step surface and an outer step surface; the drill pipe body is provided with a female connector and a male connector, the female connector is provided with internal threads, and the male connector is provided with external threads matched with the internal threads; the annular unloading groove is arranged on the male connector and is positioned at the tail part of the external thread; the inner step surface is arranged on the female connector and positioned at the tail end of the internal thread; the outer step surface is arranged on the male connector and positioned at the tail end of the external thread. According to the utility model, the unloading groove is processed on the tail screw tooth of the male joint, so that the stress concentration at the contact position of the first tooth is reduced, the torsional strength between teeth is improved, the torque can be simultaneously transmitted through the matching of the inner step surface and the outer step surface, the torsional strength of the drill rod is enhanced, the end faces of the two drill rods are simultaneously stressed, the stress at the two ends is more uniform, the strength of the connection of the drill rods is obviously improved, and the service life of the drill rod is further prolonged.

Description

Drill rod

Technical Field

The utility model relates to the technical field of drill pipes, in particular to a drill pipe.

Background

The drill rod is an important tool in geological exploration, coal seam water injection, grouting fire extinguishment, gas drainage and other engineering drilling, has very severe working conditions, and is subjected to interaction of various loads including bending, torsion, tension and compression and vibration in the drilling process. With the continuous development of drilling technology, drilling and production operations are developed towards more severe working conditions such as deeper, higher pressure, higher temperature and the like, so that higher requirements are put on the performance of the drill rod.

The common drill rod threaded connection part is easy to generate stress concentration, so that the drill rod is low in strength and easy to generate fatigue fracture. And the joint of the conventional drill rod is a common single shoulder, the shoulder is positioned at one end of the joint connecting thread, and after the joint is fastened, the torque is mainly borne by the shoulder surface, and the stress concentration is larger, so that the torque strength is weaker. Conventional drill pipes have thus failed to meet the now more demanding drilling environment.

Disclosure of Invention

The utility model aims to provide a drill rod, which solves the problems of low strength and weak torsional strength of the drill rod caused by easy stress concentration at the threaded connection part of the drill rod and larger stress concentration existing at a common single shoulder in the prior art.

The technical scheme of the utility model is as follows: a drill rod comprises a drill rod pipe body, an annular unloading groove, an inner step surface and an outer step surface; the drill pipe body is provided with a female connector and a male connector, the female connector is provided with internal threads, and the male connector is provided with external threads matched with the internal threads; the annular unloading groove is arranged on the male connector and is positioned at the tail part of the external thread; the inner step surface is arranged on the female connector and positioned at the tail end of the internal thread and is used for bearing with the end surface of the male connector axially; the outer step surface is arranged on the male connector and positioned at the tail end of the external thread and is used for bearing with the end surface of the female connector axially.

As a further improvement of the utility model, the middle part of the inner step surface is provided with an annular bulge, and the head end of the male connector, which is positioned on the external thread, is provided with a recess matched with the annular bulge.

As a further improvement of the utility model, the cross section of the annular bulge is circular, and the joint of the annular bulge and the inner step surface adopts arc transition

As a further development of the utility model, both the external thread and the internal thread are conical threads.

As a further improvement of the utility model, the thread removal height at the annular unloading groove is smaller than the distance from the thread top of the external thread to the thread pitch diameter.

As a further development of the utility model, the width of the annular relief groove is smaller than the pitch of the external thread.

As a further development of the utility model, the cross-sectional bottom of the annular relief groove is parallel to the root taper of the external thread.

As a further improvement of the utility model, the end face of the outer step surface is an inclined surface, an included angle formed between the inclined surface and the outer side wall of the male connector is an acute angle, and the end face of the female connector is parallel to the inclined surface.

Compared with the prior art, the utility model has the beneficial effects that:

1. according to the utility model, the unloading groove is processed on the tail screw tooth of the male joint, so that the stress concentration at the contact position of the first tooth is reduced, the torsional strength between teeth is improved, the torque can be simultaneously transmitted through the matching of the inner step surface and the outer step surface, the torsional strength of the drill rod is enhanced, the end faces of the two drill rods are simultaneously stressed, and the stress at the two ends is more uniform, so that the connecting strength of the drill rods is obviously improved, and the service life of the drill rods is further prolonged.

2. According to the utility model, the protruding structure is arranged at the contact position of the male thread and the female thread, so that the torsion strength of the step surface is improved, and meanwhile, the arc transition is adopted between the step contacts, so that the integral strength and the service life of the drill rod are greatly improved.

Drawings

FIG. 1 is a schematic view of a front cross-sectional structure of the present utility model;

FIG. 2 is an enlarged schematic view of a portion of the utility model at A in FIG. 1;

fig. 3 is an enlarged partial schematic view of the utility model at B in fig. 1.

Detailed Description

The following describes embodiments of the present utility model in detail with reference to fig. 1 to 3. In the description of the utility model, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate describing the utility model and simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the utility model.

The terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second" may include one or more such features, either explicitly or implicitly; in the description of the utility model, unless otherwise indicated, the meaning of "a plurality" is two or more.

Example 1

As shown in fig. 1 to 3, an embodiment of the present utility model provides a drill rod, including a drill rod body, an annular unloading groove 5, an inner step surface 2 and an outer step surface 6; the drill pipe body is provided with a female joint 1 and a male joint 7, the female joint 1 is provided with an internal thread 4-1, the male joint 7 is provided with an external thread 4-2 matched with the internal thread 4-1, and the female joint 1 and the male joint 7 are in threaded connection with the external thread 4-2 through the internal thread 4-1; the annular unloading groove 5 is arranged on the male connector 7 and is positioned at the tail part of the external thread 4-2; the inner step surface 2 is arranged on the female joint 1 and positioned at the tail end of the internal thread 4-1 and is used for bearing with the end surface of the male joint 7 in the axial direction; the outer step surface 6 is arranged on the male connector 7 and is positioned at the tail end of the external thread 4-2 and is used for bearing with the end surface of the female connector 1 axially.

In this embodiment, through the annular unloading groove 5 that sets up can effectually eliminate the tooth space stress concentration, reduce the stress concentration of first tooth contact department, improve the torsional strength between tooth space, can transmit the moment of torsion simultaneously through the interior step face 2 that sets up and outer step face 6, strengthen the torsional strength of drilling rod and make two drilling rod terminal surfaces atress simultaneously for both ends atress is more even, thereby makes drilling rod joint's intensity have showing to improve, and then has improved the life-span of drilling rod.

Example 2

In the embodiment, on the basis of the embodiment 1, an annular protrusion 3 is arranged in the middle of the inner step surface 2, and a concave matched with the annular protrusion 3 is arranged at the head end of the male connector 7 positioned on the external thread 4-2. The concentrated stress of the step surface can be effectively relieved through the annular bulge 3, and the torsional strength of the step surface is improved.

Example 3

In this embodiment, on the basis of embodiment 2, as shown in fig. 2, the cross section of the annular protrusion 3 is circular, and the connection with the inner step surface 2 adopts arc transition, and by the above arrangement, unnecessary stress concentration can be avoided.

Example 4

In this embodiment, since the sealing property of the screw connection is enhanced in the embodiment 2, both the female screw 4-1 and the male screw 4-2 are conical screws.

Example 5

In this embodiment, in order to ensure that the annular relief groove 5 still has a connecting function, the thread removal height at the annular relief groove 5 is smaller than the distance from the crest of the external thread 4-2 to the pitch diameter of the thread, based on embodiment 1.

Example 6

This embodiment is based on example 5, so that the width of the annular relief groove 5 is made smaller than the pitch of the external thread 4-2 in order to ensure a better removal of the interdental stress concentrations.

Example 7

In this embodiment, on the basis of embodiment 6, in order to ensure that the external thread 4-2 at the annular unloading groove 5 can be effectively connected with the internal thread 4-1 of the previous drill pipe box 1, the bottom of the cross section of the annular unloading groove 5 is parallel to the tooth root taper of the external thread 4-2.

Example 8

In this embodiment, in order to reduce stress, as shown in fig. 1, the end face of the outer step surface 6 is an inclined plane, and the included angle formed between the inclined plane and the outer side wall of the male connector 7 is an acute angle, and the end face of the female connector 1 is parallel to the inclined plane, so that compared with the arrangement that the end face of the outer step surface 6 is directly arranged vertically, the stress area is increased, and the stress is reduced.

In summary, the utility model makes the thread contact of the whole drill rod pipe body more uniform, greatly improves the first contact tooth and the step surface which are most likely to generate stress concentration, enhances the torsional strength of the drill rod, and prolongs the service life of the drill rod.

The foregoing disclosure is only illustrative of the preferred embodiments of the present utility model, but the embodiments of the present utility model are not limited thereto, and any variations within the scope of the present utility model will be apparent to those skilled in the art.

Claims

1. The utility model provides a drilling rod, includes the drilling rod body, is equipped with female joint (1) and public joint (7) on the drilling rod body, is equipped with internal thread (4-1) on female joint (1), be equipped with on public joint (7) with internal thread (4-1) assorted external screw thread (4-2), its characterized in that still includes:

the annular unloading groove (5) is arranged on the male connector (7) and is positioned at the tail part of the external thread (4-2);

the inner step surface (2) is arranged on the female joint (1) and positioned at the tail end of the internal thread (4-1) and is used for bearing with the end surface of the male joint (7) axially, an annular bulge (3) is arranged in the middle of the inner step surface (2), and a concave matched with the annular bulge (3) is arranged at the head end of the male joint (7) positioned at the external thread (4-2);

the outer step surface (6) is arranged on the male connector (7) and is positioned at the tail end of the external thread (4-2) and used for bearing with the end surface of the female connector (1) in the axial direction, the end surface of the outer step surface (6) is an inclined surface, an included angle formed between the inclined surface and the outer side wall of the male connector (7) is an acute angle, and the end surface of the female connector (1) is arranged in parallel with the inclined surface.

2. A drill rod according to claim 1, characterized in that the cross section of the annular protrusion (3) is circular and the connection with the inner step surface (2) is in the form of a circular arc transition.

3. A drill rod according to claim 1, characterized in that the internal thread (4-1) and the external thread (4-2) are conical threads.

4. A drill rod according to claim 1, characterized in that the thread removal height at the annular relief groove (5) is smaller than the distance from the thread top of the external thread (4-2) to the pitch diameter of the thread.

5. A drill rod according to claim 4, characterized in that the width of the annular relief groove (5) is smaller than the pitch of the external thread (4-2).

6. A drill rod according to claim 5, characterized in that the cross-sectional bottom of the annular relief groove (5) is parallel to the root taper of the external thread (4-2).