DIFF Subgroup
E21B 34/06 in wells
Introduced: January 1980
Full Title
Valve arrangements for boreholes or wells > in wells
Of 6 combined children, 4 exist in both systems.
2 codes are CPC-only extensions.
1 shared codes have differing titles between IPC and CPC.
IPC defines codes here since 1980.
Child Classifications
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- E21B 34/08 responsive to flow or pressure of the fluid obtained (E21B34/10 takes precedence) since 1980 +1 CPC IPC+CPC Available in IPC and CPC
- E21B 34/10 operated by control fluid supplied from outside the borehole since 1980 +4 CPC IPC+CPC Available in IPC and CPC
- E21B 34/12 operated by movement of casings or tubings since 1980 +1 CPC IPC+CPC Available in IPC and CPC
- E21B 34/14 operated by movement of tools, e.g. sleeve valves operated by pistons or wire line tools since 1980 +1 CPC IPC+CPC Available in IPC and CPC