CN202731779U - Single-step threaded drill collar - Google Patents
Single-step threaded drill collar Download PDFInfo
- Publication number
- CN202731779U CN202731779U CN 201220278430 CN201220278430U CN202731779U CN 202731779 U CN202731779 U CN 202731779U CN 201220278430 CN201220278430 CN 201220278430 CN 201220278430 U CN201220278430 U CN 201220278430U CN 202731779 U CN202731779 U CN 202731779U
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- CN
- China
- Prior art keywords
- drill collar
- threaded connector
- screw thread
- root
- cylinder
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The utility model discloses a single-step threaded drill collar which is applied to the technical field of oilfield drilling. One end of the drill collar is provided with an external threaded connector, and the other end of the drill collar is provided with an internal threaded connector; the single-step threaded drill collar is characterized in that the cylindrical surface of a cylindrical shape is arranged at the root of the external threaded connector, and a circular step is arranged between the cylindrical surface of the cylindrical shape and an external thread; the end part of the internal threaded connector is provided with a cylindrical hole, and the diameter of the cylindrical hole on the end part of the internal threaded connector is the same with that of the cylindrical surface of the cylindrical shape at the root of the external threaded connector; the circular step is arranged between the cylindrical hole on the end part of the internal threaded connector and an internal thread; and the length of the cylindrical surface of the cylindrical shape at the root of the external threaded connector is the same with that of the cylindrical hole on the end part of the internal threaded connector. The single-step threaded drill collar has the effects that compared with an ordinary drill collar thread, the torsional strength and the bending strength of the bigger end of the external thread are enhanced, the concentrated stress of the bigger end of the external thread is reduced, the external thread of the drill collar can be effectively prevented from being broken, the structure is simple, and the processing is easy.
Description
Technical field
The utility model relates to oil drilling down-hole equipment technical field, and particularly a kind of drill collar is a kind of separate unit rank screw thread drill collars.
Background technology
The drill collar weak part that oil drilling is used is positioned at the screw thread place, many years ago, mentions the 〞 at distance drill collar threads sealing surface 19.05mm(3/4 in the design of drill in API 7G) to locate be maximum one of the place that concentrates of screw thread stress.Along with the inside and outside footpath of drill collar and the size of screw thread, this cross section also changes occuring.According to the field statistics analysis, drill collar external screw thread fracture location mostly is positioned near the large end.Especially, for the larger drill collar of specification, its bending strength ratio surpasses equilibrium valve 2.5:1, and namely the external screw thread anti-bending strength is weaker than internal thread.Take external diameter 203.2mm drill collar as example, the large end maximum stress of its external screw thread of primary Calculation approximately is five times of internal thread Root Stress, so the external screw thread strength deficiency is the main cause that causes its destruction.
The utility model content
The purpose of this utility model is: a kind of separate unit rank screw thread drill collar is provided, improves the large end bending resistance of external screw thread, torsional strength, the whole raising drill collar application life.Overcome the technical barrier of large drill collar external screw thread strength deficiency.
The technical solution adopted in the utility model is: separate unit rank screw thread drill collar, at drill collar one end male connection is arranged, the other end at drill collar has female adapter, it is characterized in that: the root in male connection has the tubular face of cylinder, and the step of annular is arranged between the tubular face of cylinder and external screw thread; In the end of female adapter columniform hole is arranged, the diameter of the cylindrical hole of female adapter end is identical with the diameter on the tubular face of cylinder of male connection root; The step that annular is arranged between the cylindrical hole of female adapter end and internal thread; The tubular face of cylinder length of male connection root is identical with the length in the columniform hole of female adapter end.
The length on the described face of cylinder is 25.4mm; The width of the step of described annular is 10mm.
The beneficial effects of the utility model: the utility model separate unit rank screw thread drill collar, compare with common drill collar threads, strengthened antitorque, the flexural strength of the large end of external screw thread, having reduced the large end stress of external screw thread concentrates, can effectively prevent the fracture of drill collar external screw thread, and simple in structure, easily processing.
Description of drawings
Fig. 1 is the utility model separate unit rank screw thread drill collar structural profile schematic diagrames.
Among the figure, 1-male connection, 2-female adapter, the 3-face of cylinder, 4-step.
The specific embodiment
Embodiment 1: take a separate unit rank screw thread drill collar as example, be described in further detail.
Consult Fig. 1.The utility model separate unit rank screw thread drill collar has male connection 1 at drill collar one end, at the other end of drill collar female adapter 2 is arranged.Root in male connection 1 has a tubular face of cylinder 3, and the length on the face of cylinder 3 is 25.4mm.The step 4 that an annular is arranged between the tubular face of cylinder 3 and external screw thread is by step 4 transition.The width of the step 4 of annular is 10mm.In the end of female adapter 2 columniform hole is arranged, the diameter of the cylindrical hole of female adapter 2 ends is identical with the diameter on the tubular face of cylinder 3 of male connection 1 root; The step 4 that an annular is arranged between the cylindrical hole of female adapter 2 ends and internal thread.The tubular face of cylinder 3 length of male connection 1 root are identical with the length in the columniform hole of female adapter 2 ends.Described external screw thread and internal thread are taper pipe threads.
The processing method of separate unit rank screw thread drill collar.Be original thread length place processing primary sealing area and chamfering at the distance end face at first, then the turning face of cylinder 3 and separate unit rank 4, face of cylinder diameter exceeds former external screw thread outside diameter 10mm, and the face of cylinder 3 length are 25.4mm; Then begin the machining screw position, the large end of external screw thread (internal thread bore hole) diameter is than the little 4.23mm of original thread outside diameter, form of thread parameter constant.
Claims (2)
1. separate unit rank screw thread drill collar, at drill collar one end male connection (1) is arranged, the other end at drill collar has female adapter (2), it is characterized in that: the root in male connection (1) has the tubular face of cylinder (3), and the step (4) of annular is arranged between the tubular face of cylinder (3) and external screw thread; There is columniform hole end in female adapter (2), and the diameter of the cylindrical hole of female adapter (2) end is identical with the diameter on the tubular face of cylinder (3) of male connection (1) root; The step (4) that annular is arranged between the cylindrical hole of female adapter (2) end and internal thread; The tubular face of cylinder (3) length of male connection (1) root is identical with the length in the columniform hole of female adapter (2) end.
2. separate unit according to claim 1 rank screw thread drill collar, it is characterized in that: the length of the described face of cylinder (3) is 25.4mm; The width of the step of described annular (4) is 10mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220278430 CN202731779U (en) | 2012-06-13 | 2012-06-13 | Single-step threaded drill collar |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220278430 CN202731779U (en) | 2012-06-13 | 2012-06-13 | Single-step threaded drill collar |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202731779U true CN202731779U (en) | 2013-02-13 |
Family
ID=47657491
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220278430 Expired - Fee Related CN202731779U (en) | 2012-06-13 | 2012-06-13 | Single-step threaded drill collar |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202731779U (en) |
-
2012
- 2012-06-13 CN CN 201220278430 patent/CN202731779U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130213 Termination date: 20210613 |