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

Child Classifications

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• E21B 43/003 CPC only CPC only
• E21B 43/006 CPC only CPC only
• E21B 43/01 specially adapted for obtaining from underwater installations +2 CPC IPC+CPC Available in IPC and CPC
• E21B 43/02 Subsoil filtering +1 CPC IPC+CPC Available in IPC and CPC
• E21B 43/11 Perforators; Permeators IPC+CPC Available in IPC and CPC
• E21B 43/12 Methods or apparatus for controlling the flow of the obtained fluid to or in wells (E21B43/25 takes precedence; valve arrangements E21B34/00) +1 CPC IPC+CPC Available in IPC and CPC
• E21B 43/14 Obtaining from a multiple-zone well IPC+CPC Available in IPC and CPC
• E21B 43/16 Enhanced recovery methods for obtaining hydrocarbons +3 CPC −1 IPC IPC+CPC Available in IPC and CPC
• E21B 43/25 Methods for stimulating production +1 CPC IPC+CPC Available in IPC and CPC
• E21B 43/28 Dissolving minerals other than hydrocarbons, e.g. by an alkaline or acid leaching agent (E21B43/241 takes precedence) +2 CPC IPC+CPC Available in IPC and CPC
• E21B 43/285 Melting minerals, e.g. sulfur (E21B43/24 takes precedence) since 1990 IPC+CPC Available in IPC and CPC
• E21B 43/29 Obtaining a slurry of minerals, e.g. by using nozzles since 1990 +1 CPC IPC+CPC Available in IPC and CPC
• E21B 43/295 Gasification of minerals, e.g. for producing mixtures of combustible gases (E21B43/243 takes precedence) since 1990 IPC+CPC Available in IPC and CPC
• E21B 43/30 Specific pattern of wells, e.g. optimising the spacing of wells since 1980 +1 CPC IPC+CPC Available in IPC and CPC
• E21B 43/32 Preventing gas- or water-coning phenomena, i.e. the formation of a conical column of gas or water around wells since 1980 IPC+CPC Available in IPC and CPC
• E21B 43/34 Arrangements for separating materials produced by the well since 1980 +1 CPC IPC+CPC Available in IPC and CPC