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. It is to extend the central
upset of heavy weight drill pipe
and to cut spiral groove on
heavy weight drill pipe. 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
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