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DIFF Subgroup
E21B 43/16

Enhanced recovery methods for obtaining hydrocarbons

Introduced: September 1968

Full Title

Full titles differ between systems:

IPC:

Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells > Enhanced recovery methods for obtaining hydrocarbons

CPC:

Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells (applicable only to water E03B) > Enhanced recovery methods for obtaining hydrocarbons

Of 8 combined children, 4 exist in both systems.

3 codes are CPC-only extensions, 1 exist only in IPC.

1 shared codes have differing titles between IPC and CPC.

Child Classifications

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  • E21B 43/162 CPC only CPC only
  • E21B 43/164 CPC only CPC only
  • E21B 43/17 Interconnecting two or more wells by fracturing or otherwise attacking the formation ( E21B43/247 take precedence) since 1980 IPC+CPC Available in IPC and CPC
  • E21B 43/18 Repressuring or vacuum methods IPC+CPC Available in IPC and CPC
  • E21B 43/20 Displacing by water IPC+CPC Available in IPC and CPC
  • E21B 43/22 Use of chemicals or bacterial activity IPC only IPC only

Top Applicants

Top Applicants (IPC)

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

Top Applicants (CPC)

Class E21,2013–2023, worldwide · Source: EPO PATSTAT

  1. HALLIBURTON ENERGY SERVICES GROUP US 27,652
  2. SAUDI ARABIAN OIL COMPANY SA 7,755
  3. PETROCHINA COMPANY 7,025
  4. BAKER HUGHES US 6,589
  5. SCHLUMBERGER TECHNOLOGY US 6,151
  6. SINOPEC (CHINA PETROCHEMICAL CORPORATION) 4,443
  7. SCHLUMBERGER TECHNOLOGY NL 4,255
  8. CNPC (CHINA NATIONAL PETROLEUM CORPORATION) 3,991
  9. SERVICES PETROLIERS SCHLUMBERGER FR 3,300
  10. SCHLUMBERGER CANADA CA 3,086