CN203230349U

CN203230349U - Drilling tool thread structure for increasing area of thread bearing surface

Info

Publication number: CN203230349U
Application number: CN 201320100284
Authority: CN
Inventors: 胡芳婷
Original assignee: China Petroleum and Natural Gas Co Ltd
Current assignee: China Petroleum and Natural Gas Co Ltd
Priority date: 2013-03-06
Filing date: 2013-03-06
Publication date: 2013-10-09
Anticipated expiration: 2023-03-06

Abstract

The utility model relates to a drilling tool thread structure for increasing the area of a thread bearing surface and belongs to the technical field of petroleum and natural gas drilling tools. An internal thread joint is meshed with an external thread joint, an included angle between the thread bearing surface and a conical surface is 55 degrees, and the fillet radiuses of the thread bearing surface and a thread crest are 0.381mm. Compared with the prior art, the drilling tool thread structure has the advantages that the drilling tool thread structure is simple and easy to process; the area of the thread bearing surface is increased by 5.42% in comparison with an original thread; stress of the root of the thread is effectively reduced, and service life of the drilling tool thread is prolonged.

Description

A kind of drilling tool helicitic texture that increases screw thread bearing surface area

Technical field

The utility model relates to a kind of drilling tool helicitic texture that increases screw thread bearing surface area, belongs to oil, natural gas drill and petroleum extraction tools technical field.

Background technology

At present, the drilling tool nipple button-type that uses in the oil gas field generally is the API NC style connection thread, and through the field failure statistics, most of drilling tool in the fracture of screw thread position is positioned at the bottom of thread.Analyze as calculated, the active force of screw thread bearing surface is decomposed into lateral stress and axial stress, most of crackles prolong the axial direction expansion under metallographic microscope, and therefore reducing screw thread bearing surface axial stress is to reduce screw thread to rupture, prolong the drilling tool principal element in application life.

Summary of the invention

In order to overcome the deficiencies in the prior art, the utility model provides a kind of drilling tool helicitic texture that increases screw thread bearing surface area, reduce the angle of screw thread bearing surface and the conical surface, increase screw thread bearing surface area, reduce the screw thread axial stress and a kind of drilling tool screw thread that increases screw thread bearing surface area is provided.

Technical scheme of the present invention is: a kind of drilling tool helicitic texture that increases screw thread bearing surface area comprises female adapter, male connection; Female adapter and male connection engagement; Screw thread bearing surface and conical surface angle are 55 degree, and the chamfering radius of screw thread bearing surface and crest is 0.381mm.

Compared with prior art, the utility model has the advantages that:

Simple in structure, be easy to processing;

With the original thread contrast, increased screw thread bearing surface area 5.42%;

Effectively reduce thread root stress, prolong drilling tool screw thread application life.

Description of drawings

When considered in conjunction with the accompanying drawings, by the reference following detailed, can more completely understand the utility model better and learn wherein many attendant advantages easily, but accompanying drawing described herein is used to provide further understanding of the present utility model, constitute a part of the present utility model, illustrative examples of the present utility model and explanation thereof are used for explaining the utility model, do not constitute improper restriction of the present utility model, as figure wherein:

Fig. 1 is structural representation of the present utility model.

Fig. 2 is A of the present utility model portion structure enlarged diagram.

Below in conjunction with drawings and Examples the utility model is further specified.

The specific embodiment

Obviously, the many modifications and variations done based on aim of the present utility model of those skilled in the art belong to protection domain of the present utility model.

Embodiment 1: as shown in Figure 1 and Figure 2, a kind of drilling tool helicitic texture that increases screw thread bearing surface area comprises female adapter 1, male connection 2.On original screw thread processing basis, change the lathe tool angle, be 55 degree with screw thread bearing surface 3 and the conical surface 4 angle machining, screw thread bearing surface 3 still is 0.381mm with the chamfering radius of crest, other parameter constants of screw thread spigot surface 5 and screw thread.

Dotted portion is the original thread tooth form among the figure.

Embodiment 2: as shown in Figure 1 and Figure 2, a kind of drilling tool helicitic texture that increases screw thread bearing surface area comprises female adapter 1, male connection 2; Female adapter 1 and male connection 2 engagements; Screw thread bearing surface 3 is 55 degree with the conical surface 4 angles, and screw thread bearing surface 3 is 0.381mm with the chamfering radius of crest.

The connecting portion tapering of female adapter 1, male connection 2 is the original thread tapering, and screw thread bearing surface 3 is reduced to 55 degree with the conical surface 4 angles by original 60 degree, and causing the form of thread angle to increase is 65 degree, other parameter constants of screw thread spigot surface 5 and screw thread.

As mentioned above, embodiment of the present utility model is explained, but as long as not breaking away from inventive point of the present utility model and effect in fact can have a lot of distortion, this will be readily apparent to persons skilled in the art.Therefore, such variation also all is included within the protection domain of the present utility model.

Claims

1. a drilling tool helicitic texture that increases screw thread bearing surface area is characterized in that comprising female adapter, male connection; Female adapter and male connection engagement; Screw thread bearing surface and conical surface angle are 55 degree, and the chamfering radius of screw thread bearing surface and crest is 0.381mm.