CN201778667U - Double-shouldered drill pipe with improved fatigue strength - Google Patents
Double-shouldered drill pipe with improved fatigue strength Download PDFInfo
- Publication number
- CN201778667U CN201778667U CN201020282535XU CN201020282535U CN201778667U CN 201778667 U CN201778667 U CN 201778667U CN 201020282535X U CN201020282535X U CN 201020282535XU CN 201020282535 U CN201020282535 U CN 201020282535U CN 201778667 U CN201778667 U CN 201778667U
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- drilling rod
- rod body
- fatigue strength
- bearing torque
- torque shoulder
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Abstract
The utility model relates to a double-shouldered drill pipe with improved fatigue strength, applied to the technical field of petroleum drilling. The double-shouldered drill pipe with improved fatigue strength mainly comprises a drilling rod body, an inner threading connector, and an outer threading connector, wherein the cylindrical drilling rod body is provided with a central hole, and two ends of the drilling rod body are respectively provided with the inner threading connector and the outer threading connector. The outer threading connector is provided with an annular main torque ledge which is located at the root part of outer threads and vertical to the central line of the drilling rod body; the inner threading connector is provided with an annular auxiliary torque ledge which is located at the root part of inner threads and vertical to the central line of the drilling rod body; and the distance from the main torque ledge to the end face of the outer threading connector is the same to that from the auxiliary torque ledge to the end face of the inner threading connector. The utility model has the advantage of ensuring the fatigue strength of the connectors to be higher than that of the connectors of the drilling rods of the same grades at the same time of guaranteeing sufficient torsional strength and obviously improving hydraulic performance.
Description
Technical field
The utility model relates to the petroleum drilling technology field, and particularly a kind of drilling well downhole tool is an a kind of pair of shoulder drilling rod.
Background technology
At present, in recent years, the oil gas drilling environment is harsh day by day, the oil gas well depth constantly increases, and deep-well, directional well, horizontal well are on the increase, because these well frictional resistances are huge, borehole size is limited, require drilling rod that enough torsional strengths are arranged, good hydraulic is arranged simultaneously, therefore the tool joint external diameter that need reduce, increase tool joint internal diameter.The API standard drilling rod that generally uses can't satisfy the demand of these wells at present, and this just needs the non-API standard drilling rod of exploitation.
The torsional strength of API standard tool joint is lower than body slightly, and the API standard tool joint is a kind of taper pipe thread joint with rotation shoulder, and after the internal and external threads joint screwed, the rotation shoulder closely contacted, and seals.If the moment of torsion that drilling rod bears is greater than the torsional strength of joint, just swelling or the elongation strain of male connection of female adapter taken place.Obviously will increase the torsional strength of tool joint, just must increase external diameter, reduce internal diameter, but the mobile of the frictional resistance of drill string, obstruction mud gone into the well, increased to excessive external diameter, too small internal diameter with influencing drilling rod.So the torsional strength of API standard tool joint generally is lower than drill pipe body and size is bigger.
The utility model content
The purpose of this utility model is: a kind of two shoulder drilling rods that improve fatigue strength are provided, guarantee enough torsional strengths, obviously improve hydraulic performance in, the fatigue resistance of joint is higher than drilling rod at the same level.
The technical solution adopted in the utility model is: the two shoulder drilling rods that improve fatigue strength, mainly form by drilling rod body, female adapter and male connection, cylinder bodily form drilling rod body has centre bore, at drilling rod body two ends female adapter and male connection are arranged respectively, it is characterized in that: annular main bearing torque shoulder is arranged in male connection, the position of main bearing torque shoulder is at externally threaded root, and main bearing torque shoulder plane is vertical with drilling rod body center line; The auxiliary bearing torque shoulder of annular is arranged in female adapter, and the position of auxiliary bearing torque shoulder is at the root of internal thread, and auxiliary bearing torque shoulder plane is vertical with drilling rod body center line; Main bearing torque shoulder equates with the distance of auxiliary bearing torque shoulder to the female adapter end face to the distance of male connection end face.
The helicitic texture of two shoulder drilling rods is identical with the API standard, so tool joint of the present invention can be exchanged with the API modular connection.The centre bore internal diameter is not more than the API standard tool joint internal diameter 20% of same grade of steel, same specification, same screw thread; The external diameter of female adapter and male connection is not less than the API standard tool joint external diameter 5% of same grade of steel, same specification, same screw thread.
Because two shoulder drilling rod Duo an auxiliary torque shoulder than the API modular connection, so keeping the joint torsional strength to equal or being slightly smaller than under the situation of drill pipe body, can increase the joint internal diameter, minimizing joint external diameter.Thereby reduced the drill string frictional resistance, increased the drill string hydraulic performance.But investigation is found, if excessively enlarge the joint internal diameter or excessively reduce the joint external diameter, will be caused the tool joint beginning of fatigue failure.Calculating shows expansion joint internal diameter or reduces the joint external diameter and will reduce the joint sectional area, increase joint stress, calculating show if internal diameter greater than same grade of steel, same specification, same screw thread API standard tool joint internal diameter 20%, or external diameter is less than same grade of steel, same specification, with thread forms API standard tool joint external diameter 4%, and concentrate may be greater than the excessive place of body thickening for the stress of female adapter or male connection so.So the internal diameter of two shoulder drilling rod can not unrestrictedly enlarge, external diameter can not unrestrictedly dwindle, must consider fatigue strength.
The beneficial effects of the utility model: the utility model improves two shoulder drilling rods of fatigue strength, at the enough torsional strengths of assurance, obviously improve hydraulic performance in, the fatigue resistance of joint is higher than drilling rod at the same level.
Description of drawings
Fig. 1 is two shoulder two ends of drill joint connecting structure generalized sections that the utility model improves fatigue strength.
Among the figure, 1. female adapter, 2. main torque shoulder, 3. auxiliary torque shoulder, 4. male connection, 5. screw thread.
The specific embodiment
Embodiment 1: with a specification is 139mm, and grade of steel is that two shoulder drilling rods of the raising fatigue strength of S135 are example, and the utility model is described in further detail.
Consult Fig. 1.The utility model improves two shoulder drilling rods of fatigue strength, mainly is made up of drilling rod body, female adapter 1 and male connection 4, and cylinder bodily form drilling rod body has centre bore, at drilling rod body two ends female adapter 1 and male connection 4 is arranged respectively.The external diameter of female adapter 1 and male connection 4 is 181mm, and internal diameter is 89mm, and screw thread 5 adopts API5 1/2 " FH.Annular main bearing torque shoulder 2 is arranged in male connection 4, and the position of main bearing torque shoulder 2 is at externally threaded root, and main bearing torque shoulder 2 planes are vertical with drilling rod body center line; The auxiliary bearing torque shoulder 3 of annular is arranged in female adapter 1, and the position of auxiliary bearing torque shoulder 3 is at the root of internal thread, and auxiliary bearing torque shoulder 3 planes are vertical with drilling rod body center line; Main bearing torque shoulder 2 equates with the distance of auxiliary bearing torque shoulder 3 to female adapter 1 end face to the distance of male connection 4 end faces.
Embodiment 2: with embodiment 1 difference be: the specification that improves two shoulder drilling rods of fatigue strength is 127mm, grade of steel is the two shoulder drilling rods of the high-fatigue strength of S135, the external diameter of female adapter 1 and male connection 4 is 165mm, and internal diameter is 83mm, and joint screw thread adopts API NC50.
Claims (1)
1. two shoulder drilling rods that improve fatigue strength, mainly form by drilling rod body, female adapter (1) and male connection (4), cylinder bodily form drilling rod body has centre bore, female adapter (1) and male connection (4) are arranged respectively at drilling rod body two ends, it is characterized in that: annular main bearing torque shoulder (2) is arranged in male connection (4), the position of main bearing torque shoulder (2) is at externally threaded root, and main bearing torque shoulder (2) plane is vertical with drilling rod body center line; The auxiliary bearing torque shoulder (3) of annular is arranged in female adapter (1), and the position of auxiliary bearing torque shoulder (3) is at the root of internal thread, and auxiliary bearing torque shoulder (3) plane is vertical with drilling rod body center line; Main bearing torque shoulder (2) equates with the distance of auxiliary bearing torque shoulder (3) to female adapter (1) end face to the distance of male connection (4) end face.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020282535XU CN201778667U (en) | 2010-08-05 | 2010-08-05 | Double-shouldered drill pipe with improved fatigue strength |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020282535XU CN201778667U (en) | 2010-08-05 | 2010-08-05 | Double-shouldered drill pipe with improved fatigue strength |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201778667U true CN201778667U (en) | 2011-03-30 |
Family
ID=43791880
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201020282535XU Expired - Lifetime CN201778667U (en) | 2010-08-05 | 2010-08-05 | Double-shouldered drill pipe with improved fatigue strength |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201778667U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105909185A (en) * | 2016-06-27 | 2016-08-31 | 无锡双马钻探工具有限公司 | Thread structure of drilling rod |
| CN105952390A (en) * | 2016-06-27 | 2016-09-21 | 无锡双马钻探工具有限公司 | Large-torque drill stem thread structure |
| CN112756905A (en) * | 2021-01-14 | 2021-05-07 | 山东威玛装备科技股份有限公司 | Numerical control repairing method for double-shoulder threads of drilling tool |
-
2010
- 2010-08-05 CN CN201020282535XU patent/CN201778667U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105909185A (en) * | 2016-06-27 | 2016-08-31 | 无锡双马钻探工具有限公司 | Thread structure of drilling rod |
| CN105952390A (en) * | 2016-06-27 | 2016-09-21 | 无锡双马钻探工具有限公司 | Large-torque drill stem thread structure |
| CN112756905A (en) * | 2021-01-14 | 2021-05-07 | 山东威玛装备科技股份有限公司 | Numerical control repairing method for double-shoulder threads of drilling tool |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110330 |
|
| CX01 | Expiry of patent term |