Special features related to earth drilling for obtaining oil, gas or water

Child Classifications

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• E21B 2200/01 Sealings characterised by their shape
• E21B 2200/02 Down-hole chokes or valves for variably regulating fluid flow
• E21B 2200/03 Valves operated by gear mechanisms, e.g. rack and pinion mechanisms
• E21B 2200/04 Ball valves
• E21B 2200/05 Flapper valves
• E21B 2200/06 Sleeve valves
• E21B 2200/08 Down-hole devices using materials which decompose under well-bore conditions
• E21B 2200/09 Detecting, eliminating, preventing liquid slugs in production pipes
• E21B 2200/20 Computer models or simulations, e.g. for reservoirs under production, drill bits
• E21B 2200/22 Fuzzy logic, artificial intelligence, neural networks or the like