API Spec7-1 Standard
01 Design & working procedure Confirm to the requirment of API Spec
02 Non-API standard type of drill collars are also avalible as per client'request
03 Cold-rolled thread roots
04 Low alloy steel as material applied
05 Integral forging, no welds
06 Hard banding can be added as per client ’request
07 Option Integral heavy weight drill pipe with two central upsets and with spiral grooves are also available
A. Integral Heavy Weight Drill Pipe
The wall thickness of heavy weight drill pipe is between drill pipe and drill collar, its structure is similar with drill pipe. It is made from premium alloyed steel. Its both tool joints and middle upset are welded hardbands. Technical parameters meet with API Spec7-1 Standard.
B. Integral Spiral Heavy Weight Drill Pipe
Integral spiral heavy weight drill pipe is to extend the central upset of heavy weight drill pipe and to cut spiral groove on heavy weight drill pipe.
Integral Heavy Weight Drill Pipe
