GJ GJT Series Roller Cone Drilling Bits
GJ / GJT metal sealed bit with roller bearing
GJ/GJT series bit adopts metal seal with roller bearing, which can drill stably with middle to low WOB and middle to high RPM, it’s the ideal choice for higher part of well section.
The size range of GJ/GJT series bit is 12 1/4 – 17 1/2 inch and its IADC code is 114 -54
Main structure features:
· Sizes of bearing journal and rollers are made larger by arranging the rollers in recesses in cone body.
· All rubber compensator is used which can limit pressure differential and prevent drilling fluid from entering the lubrication system and this provides the bearing system with good assurance of lubrication.
· Shirttail and head OD are hardfaced for enhanced gage protection. Center nozzle is equipped for bits of larger sizes.
· A row of inserts is added between gage row and heel row to tnm borehole wall and protect cone shell to form the special GJT series bit.
Drilling Bits Type:
GJ115C、GJT115C、GJT125C、GJ135G、GJT415G、GJT435G、GJT445G GJT435G、GJ515G、GJ515G、GJT515GC、GJ535G、GJ535G
GJ115G、GJ115G、GJT115G、GJ135G、GJT135G、GJ415G、GJT415G、 GJ435G、GJT435G、GJT445G、GJ515G、GJT515G、GJT525G、GJ535G
