(0)E21B:5/6:
IPC6
SECTION E - FIXED CONSTRUCTIONS
EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS,...
E21B
6/7
<<   >>   E21B034/00 - E21B044/00  

34
/ 00 Valve arrangements for boreholes or wells (in drilling fluid circulation systems E 21 B 21/10; blow-out preventers E 21 B 33/06; oil flow regulating apparatus E 21 B 43/12; valves in general F 16 K) [3]

34
/ 02 • in well heads [3]  

34
/ 04 • • in underwater well heads [3]  

34
/ 06 • in wells [3]  

34
/ 08 • • responsive to flow or pressure of the fluid obtained (E 21 B 34/10 takes precedence) [3]  

34
/ 10 • • operated by control fluid supplied from above ground (above ground control means E 21 B 34/16) [3]  

34
/ 12 • • operated by movement of casings or tubings [3]  

34
/ 14 • • operated by movement of tools, e.g. sleeve valves operated by pistons or wire line tools [3]  

34
/ 16 • Above-ground control means therefor [3]  
 

 35
/ 00 Methods or apparatus for preventing or extinguishing fires (cutting or deforming pipes to control fluid flow E 21 B 29/08; controlling flow of fluid to or in wells E 21 B 43/12; fire fighting in general A 62 C, A 62 D)
 

 36
/ 00 Heating, cooling, or insulating arrangements for boreholes or wells, e.g. for use in permafrost zones (drilling by use of heat E 21 B 7/14; secondary recovery methods using heat E 21 B 43/24) [3]

36
/ 02 • using burners [3]  

36
/ 04 • using electrical heaters [3]  
 

 37
/ 00 Methods or apparatus for cleaning boreholes or wells ( E 21 B 21/00 takes precedence; cleaning pipes in general B 08 B 9/02)

37
/ 02 • Scrapers specially adapted therefor  

37
/ 04 • • operated by fluid pressure, e.g. free-piston scrapers (operating other tools by fluid pressure E 21 B 23/08) [3]  

37
/ 06 • using chemical means for preventing or limiting the deposition of paraffins or like substances [3]  

37
/ 08 • cleaning in situ of down-hole filters, screens, or gravel packs (E 21 B 37/06 takes precedence) [3]  

37
/ 10 • Well swabs [3]  
 

 40
/ 00 Tubing catchers, automatically arresting the fall of oil-well tubing
 

 41
/ 00 Equipment or details not covered by groups E 21 B 15/00 to E 21 B 40/00

41
/ 02 • in situ inhibition of corrosion in boreholes or wells (dump bailers E 21 B 27/02; inhibiting corrosion in general C 23 F) [3,6]  

41
/ 04 • Manipulators for underwater operations, e.g. temporarily connected to well heads (manipulators in general B 25 J ) [3]  

41
/ 06 • Work chambers for underwater operations, e.g. temporarily connected to well heads (in general B 63 C 11/00) [3]  

Obtaining fluids from wells [3]
 

 43
/ 00 Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells (applicable only to water E 03 B; obtaining oil-bearing deposits or soluble or meltable materials by mining techniques E 21 C 41/00; pumps F 04)

43
/ 01 • specially adapted for obtaining from underwater installations (underwater well heads E 21 B 33/035)  

43
/ 013 • • Connecting a production flow line to an underwater well head [3]  

43
/ 017 • • Production satellite stations, i.e. underwater installations comprising a plurality of satellite well heads connected to a central station (underwater separating arrangements E 21 B 43/36) [3]  

43
/ 02 • Subsoil filtering (E 21 B 43/11 takes precedence)  

43
/ 04 • • Gravelling of wells  

43
/ 08 • • Screens or liners  

43
/ 10 • • Setting of casings, screens or liners in wells (driving or forcing casings into boreholes, simultaneously drilling and casing boreholes E 21 B 7/20; setting of tools, packers or the like E 21 B 23/00; suspending casings in well heads E 21 B 33/04)  

43
/ 11 • Perforators; Permeators  

43
/ 112 • • Perforators with extendable perforating members, e.g. actuated by fluid means  

43
/ 114 • • Perforators using direct fluid action, e.g. abrasive jets  

43
/ 116 • • Gun or shaped-charge perforators  

43
/ 117 • • • Shaped-charge perforators (E 21 B 43/118 takes precedence)  

43
/ 118 • • • characterised by lowering in vertical position and subsequent tilting to operating position  

43
/ 1185 • • • Ignition systems [3]  

43
/ 119 • • Details, e.g. for locating perforating place or direction  

43
/ 12 • Methods or apparatus for controlling the flow of the obtained fluid to or in wells (E 21 B 43/25 takes precedence; valve arrangements E 21 B 34/00)  

43
/ 14 • Obtaining from a multiple-zone well  

43
/ 16 • Enhanced recovery methods for obtaining hydrocarbons (fracturing E 21 B 43/26; obtaining slurry E 21 B 43/29; reclamation of contaminated soil in situ B 09 C)  

43
/ 17 • • Interconnecting two or more wells by fracturing or otherwise attacking the formation (E 21 B 43/247 takes precedence) [3]  

43
/ 18 • • Repressuring or vacuum methods  

43
/ 20 • • Displacing by water  

43
/ 22 • • Use of chemicals or bacterial activity (E 21 B 43/27 takes precedence; chemical features in extracting oils from oil sands or shales C 10 G)  

43
/ 24 • • using heat, e.g. steam injection (heating, cooling or insulating wells E 21 B 36/00)  

43
/ 241 • • • combined with solution mining of non-hydrocarbon minerals, e.g. solvent pyrolysis of oil shale [5]  

43
/ 243 • • • Combustion in situ [3]  

43
/ 247 • • • • in association with fracturing processes [3]  

43
/ 248 • • • • • using explosives [5]  

43
/ 25 • Methods for stimulating production (dump bailers E 21 B 27/02; vibration generating arrangements E 21 B 28/00 )  

43
/ 26 • • by forming crevices or fractures  

43
/ 263 • • • using explosives [3]  

43
/ 267 • • • reinforcing fractures by propping [3]  

43
/ 27 • • • by use of eroding chemicals, e.g. acids  

43
/ 28 • Dissolving minerals other than hydrocarbons, e.g. by an alkaline or acid leaching agent (E 21 B 43/241 takes precedence) [5]  

43
/ 285 • Melting minerals, e.g. sulfur (E 21 B 43/24 takes precedence; heating, cooling or insulating arrangements for wells E 21 B 36/00) [5]  

43
/ 29 • Obtaining a slurry of minerals, e.g. by using nozzles [5]  

43
/ 295 • Gasification of minerals, e.g. for producing mixtures of combustible gases (E 21 B 43/243 takes precedence) [5]  

43
/ 30 • Specific pattern of wells, e.g. optimizing the spacing of wells (production satellite stations E 21 B 43/017) [3]  

43
/ 32 • Preventing gas- or water-coning phenomena, i.e. the formation of a conical column of gas or water around wells [3]  

43
/ 34 • Arrangements for separating materials produced by the well (separating apparatus per se, see the relevant subclasses) [3]  

43
/ 36 • • Underwater separating arrangements (E 21 B 43/38 takes precedence) [3]  

43
/ 38 • • in the well [3]  

43
/ 40 • • Separation associated with re-injection of separated materials [3]  

Automatic control; Surveying or testing [3]
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