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IPC Subgroup
E21B 43/11

Perforators; Permeators

Introduced: September 1968

Last revised: January 2006

Full Title

Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells > Perforators; Permeators

Classification Context

Section:
FIXED CONSTRUCTIONS
Class:
EARTH OR ROCK DRILLING; MINING
Subclass:
EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS

Related Keywords

perforators for obtaining oil, gas, or water from deep wellsPERMEATORS for obtaining oil, gas, or water from deep wells

4 direct subcodes

Child Classifications

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  • E21B 43/112 Perforators with extendable perforating members, e.g. actuated by fluid means
  • E21B 43/114 Perforators using direct fluid action, e.g. abrasive jets
  • E21B 43/119 Details, e.g. for locating perforating place or direction

Top Applicants

Top 10 applicants by patent filingsfor class E21, 2013–2023, worldwide · Source: EPO PATSTAT

  1. HALLIBURTON ENERGY SERVICES GROUP US 26,607
  2. PETROCHINA COMPANY 14,382
  3. SINOPEC (CHINA PETROCHEMICAL CORPORATION) 10,137
  4. CNPC (CHINA NATIONAL PETROLEUM CORPORATION) 6,517
  5. BAKER HUGHES US 6,269
  6. SCHLUMBERGER TECHNOLOGY US 5,929
  7. SAUDI ARABIAN OIL COMPANY SA 5,880
  8. SOUTHWEST PETROLEUM UNIVERSITY 4,477
  9. CHINA UNIVERSITY OF MINING AND TECHNOLOGY 4,357
  10. SCHLUMBERGER TECHNOLOGY NL 4,219