CPC Main Group
E21B 19/00 Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
12 direct subcodes
Child Classifications
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- E21B 19/02 Rod or cable suspensions
- E21B 19/08 Apparatus for feeding the rods or cables (E21B19/22 takes precedence; automatic feed E21B44/02); Apparatus for increasing or decreasing the pressure on the drilling tool; Apparatus for counterbalancing the weight of the rods
- E21B 19/10 Slips; Spiders
- E21B 19/12 Rope clamps
- E21B 19/14 Racks, ramps, troughs or bins, for holding the lengths of rod singly or connected; Handling between storage place and borehole (E21B19/20, E21B19/22 take precedence)
- E21B 19/16 Connecting or disconnecting pipe couplings or joints (E21B19/20 takes precedence)
- E21B 19/18 Connecting or disconnecting drill bit and drilling pipe
- E21B 19/20 Combined feeding from rack and connecting, e.g. automatically
- E21B 19/22 Handling reeled pipe or rod units, e.g. flexible drilling pipes
- E21B 19/24 Guiding or centralising devices for drilling rods or pipes
Top Applicants
Top 10 applicants by patent filingsfor class E21, 2013–2023, worldwide · Source: EPO PATSTAT
- HALLIBURTON ENERGY SERVICES GROUP US 27,652
- SAUDI ARABIAN OIL COMPANY SA 7,755
- PETROCHINA COMPANY 7,025
- BAKER HUGHES US 6,589
- SCHLUMBERGER TECHNOLOGY US 6,151
- SINOPEC (CHINA PETROCHEMICAL CORPORATION) 4,443
- SCHLUMBERGER TECHNOLOGY NL 4,255
- CNPC (CHINA NATIONAL PETROLEUM CORPORATION) 3,991
- SERVICES PETROLIERS SCHLUMBERGER FR 3,300
- SCHLUMBERGER CANADA CA 3,086