API S135 /G105 Drill Pipe

Our company's drill pipes are in accordance with API 5D, API SPEC 7 Standards. The
material of drill pipe body are chosen by the 1&3 group of API 5D.(Group 1-Grade E75;
Group 3-Grade X95, G105, S135).
The choice of tool joints is according to the customers’requirements, and the tool joints
are up to API SPEC7 Standards.
First, uses the double ledge attachment drill rod the reason
The ordinary API male union because attaches the thread outer diameter limit, the API drill rod has pair of contradictory: Attaches anti turns the intensity and the male union flushing port size. The S135 high strength drill rod, the contradiction is in particular more prominent

attaches the flushing port size to increase, attaches antiturns the intensity to reduce, antiturns the strength ratio with the tube body to reduce; (2) attaches flushing port minification, attaches antiturns the intensity to increase, but the hydraulic horsepower loss increases.

How therefore both can increase the flushing port size, and can not reduce, even increases the attachment anti- to turn the intensity.

Bohai Sea can a gram company produce the double ledge attachment drill rod can solve this problem well: Both may increase the attachment flushing port size, reduces the hydraulic horsepower to lose, and can enhance the attachment anti- to turn the intensity, causes to attach anti- turns the intensity to be higher than the tube body antito turn the intensity...

Second, double ledge attachment drill rod principle:
Ordinary API attaches anti- turns the intensity by the outside ledge contacted area, the diameter and male union thread pitch diameter place thickness decided that, these attach the outer diameter and the male union flushing port size limit. The double ledge attachment has two ledges: Is outside the ledge, another is in the ledge. In the ledge plays to increases anti- turns the intensity the role, after causes the drilling rod coupling flushing port suitably to increase, but also can guarantee the attachment antito turn strongly is higher than the tube body anti- to turn the intensity.
Turns on lathe after the double ledge attachment gathers, outside the ledge goes against, in the ledge the very small gap outside, by guarantees the ledge to be able to play to the seal role, after the screw on achieved the certain torque in the ledge goes against, after achieved on the torque, in the ledge anti- turns the intensity to have an effect.

Third, double ledge attachment performance and merit:
The double ledge attachment performance attached list shows, the merit is the attachment flushing port may suitably increase, like the S135 drill rod male union flushing port size 2-3/4 "increases from the API request to 3-1/4", but attaches and the tube body anti- turns the strength ratio from 0.86 to increase to 1.00, achieved both has been able suitably to increase the flushing port size and to be able to enhance attaches anti- turns the intensity the goal, enhanced the drill rod whole anti- to turn the intensity, at the same time also could meet the well drilling need well. At the same time the double ledge attachment drill rod and the ordinary API drill rod may exchange.

Double ledge attachment drill rod use matters needing attention:.

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