IPC 6 English version E21B 31/00-E21B 49/10

E21B03100-E21B04910

SECTION E– FIXED CONSTRUCTIONS

E 21

EARTH DRILLING; MINING

E 21 B

EARTH DRILLING, e.g. DEEP DRILLING (mining, quarrying E 21 C; making shafts, driving galleries or tunnels E 21 D); OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS [5]

31/

Fishing for or freeing objects in boreholes or wells (provisions on well heads for introducing or removing objects E 21 B 33/068; locating or determining the position of objects in boreholes or wells E 21 B 47/09)

31/

Freeing by flushing [3]

31/

using magnetic means [3]

31/

using junk baskets or the like [3]

31/

107

using impact means for releasing stuck parts, e.g. jars (telescoping joints E 21 B 17/07) [3]

31/

113

hydraulically operated [3]

31/

Grappling tools, e.g. tongs or grabs

31/

with means deflecting the direction of the tool, e.g. by use of knuckle joints (apparatus for deflecting the boring E 21 B 7/08) [3]

31/

combined with cutting or destroying means (cutting or destroying means per se E 21 B 29/00) [3]

31/

gripping externally, e.g. overshot [3]

31/

gripping internally, e.g. fishing spears [3]

33/

Sealing or packing boreholes or wells

33/

Surface sealing or packing

33/

Well heads; Setting-up thereof (valve arrangements therefor E 21 B 34/02)

33/

035

specially adapted for underwater installations (E 21 B 33/043, E 21 B 33/064, E 21 B 33/076 take precedence) [3]

33/

037

Protective housings therefor [3]

33/

038

Connectors used on well heads, e.g. for connecting blow-out preventer and riser (connecting a production flow line to an underwater well head E 21 B 43/013) [3]

33/

Casing heads; Suspending casings or tubings in well heads (setting of casings in wells E 21 B 43/10)

33/

043

specially adapted for underwater well heads (E 21 B 33/047 takes precedence) [3]

33/

047

for plural tubing strings [3]

33/

Cementing-heads, e.g. having provision for introducing cementing plugs

33/

Blow-out preventers [3]

33/

064

specially adapted for underwater well heads (connectors therefor E 21 B 33/038) [3]

33/

068

having provision for introducing objects or fluids into, or removing objects from, wells (cementing-heads E 21 B 33/05) [3]

33/

072

for cable-operated tools (E 21 B 33/076 takes precedence) [3]

33/

076

specially adapted for underwater installations [3]

33/

Wipers; Oil savers

33/

in the borehole

33/

Packers; Plugs (used for cementing E 21 B 33/134, E 21 B 33/16)

33/

122

Multiple-string packers

33/

124

Units with longitudinally-spaced plugs for isolating the intermediate space

33/

126

with fluid-pressure-operated elastic cup or skirt (E 21 B 33/122, E 21 B 33/124 take precedence)

33/

127

with inflatable sleeve (E 21 B 33/122, E 21 B 33/124 take precedence)

33/

128

with a member expanded radially by axial pressure (E 21 B 33/122, E 21 B 33/124 take precedence)

33/

129

with mechanical slips for hooking into the casing (E 21 B 33/122, E 21 B 33/124 take precedence)

33/

1295

actuated by fluid pressure [6]

33/

Methods or devices for cementing, for plugging holes, crevices, or the like (dump bailers E 21 B 27/02; soil-conditioning or soil-stabilising materials C 09 K 17/00)

33/

132

(transferred to E 21 B 27/02)

33/

134

Bridging plugs

33/

136

Baskets, e.g. of umbrella type

33/

138

Plastering the borehole wall; Injecting into the formation

33/

for cementing casings into boreholes

33/

using plugs for isolating cement charge; Plugs therefor

34/

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/

in well heads [3]

34/

in underwater well heads [3]

34/

in wells [3]

34/

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

34/

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

34/

operated by movement of casings or tubings [3]

34/

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

34/

Above-ground control means therefor [3]

35/

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/

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/

using burners [3]

36/

using electrical heaters [3]

37/

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/

Scrapers specially adapted therefor

37/

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

37/

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

37/

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

37/

Well swabs [3]

40/

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

41/

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

41/

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/

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

41/

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/

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/

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/

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

43/

Gravelling of wells

43/

Screens or liners

43/

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/

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/

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/

Obtaining from a multiple-zone well

43/

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/

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

43/

Repressuring or vacuum methods

43/

Displacing by water

43/

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/

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/

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

43/

by forming crevices or fractures

43/

263

using explosives [3]

43/

267

reinforcing fractures by propping [3]

43/

by use of eroding chemicals, e.g. acids

43/

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/

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/

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

43/

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

43/

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

43/

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

43/

in the well [3]

43/

Separation associated with re-injection of separated materials [3]

Automatic control; Surveying or testing [3]

44/

Automatic control systems specially adapted for drilling operations, i.e. self-operating systems which function to carry out or modify a drilling operation without intervention of a human operator, e.g. computer-controlled drilling systems (for non-automatic drilling control, see the operation controlled; automatic feeding from rack and connecting of drilling pipes E 21 B 19/20; controlling pressure or flow of drilling fluid E 21 B 21/08; control systems in general G 05); Systems specially adapted for monitoring a plurality of drilling variables or conditions (means for transmitting measuring-signals from the well to the surface E 21 B 47/12) [3]

Surveying or testing

45/

Measuring the drilling time or rate of penetration

47/

Survey of boreholes or wells (monitoring pressure or flow of drilling fluid E 21 B 21/08; geophysical logging G 01 V)

47/

Devices for supporting measuring instruments on a drill pipe, rod or wireline (setting or locking tools in boreholes or wells E 21 B 23/00); Protecting measuring instruments in boreholes against heat, shock, pressure or the like [6]

47/

Determining slope or direction (clinometers or direction meters G 01 C)

47/

022

of the borehole

47/

024

of devices in the borehole (E 21 B 47/022 takes precedence)

47/

026

of penetrated ground layers (apparatus for obtaining oriented cores E 21 B 25/16; formation testing E 21 B 49/00)

47/

Measuring depth or liquid level (measuring liquid level in general G 01 F)

47/

Measuring temperature or pressure (measuring temperature in general G 01 K; measuring pressure in general G 01 L)

47/

Measuring diameter (measuring diameter in general G 01 B)

47/

Locating or determining the position of objects in boreholes or wells; Identifying the free or blocked portions of pipes (measuring depth E 21 B 47/04; measuring diameter E 21 B 47/08) [3]

47/

Locating fluid leaks, intrusions, or movements

47/

Means for transmitting measuring-signals from the well to the surface, e.g. for logging while drilling (remote signalling in general G 08)

47/

using acoustic waves [6]

47/

through the drill string or casing [6]

47/

through the well fluid [6]

49/

Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells (sampling in general G 01 N 1/00)

49/

by mechanically taking samples of the soil (apparatus for obtaining undisturbed cores E 21 B 25/00; investigation of foundation soil in situ E 02 D 1/00)

49/

using explosives in boreholes; using projectiles penetrating the wall [3]

49/

using side-wall drilling tools or scrapers

49/

Obtaining fluid samples or testing fluids, in boreholes or wells [3]

49/

using side-wall fluid samplers or testers [3]

E21B 11/00 - E21B 29/12