Тяжелый вес бурильной трубы

1. Heavy weight drill pipe, API Heavy weight drill pipeA. Integral Heavy Weight Drill PipeNote: 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 Note: 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.01 Design & working procedure Conform 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 roots04low alloy steel as material applied05 Integral forging, no welds06 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