E
SECTION E — FIXED CONSTRUCTIONS
  
EARTH DRILLING; MINING
 E21
MINING
 E21B
DEEP DRILLING; OBTAINING OIL, GAS, WATER OR SOLUBLE MATERIALS FROM DEEP WELLS
 E21B 1/00 - 
E21B 7/00
Devices or methods for deep-drilling
 E21B 1/00
Percussion drilling
 E21B 1/02
·  Surface drives for percussion drilling
 E21B 1/04
·  ·  Devices for reversing the movement of the rod or cable at the surface
 E21B 1/06
·  Drives for percussion drilling in the borehole
 E21B 1/08
·  ·  Devices for reversing the movement of the rod or cable in the borehole
 E21B 1/10
·  Drilling jars, i.e. lost-motion connections
 E21B 3/00
Rotary drilling
 E21B 3/02
·  Surface drives for rotary drilling
 E21B 3/04
·  ·  Rotary tables
 E21B 3/06
·  ·  Adaptation of rotary draw works to drive rotary tables (connecting or disconnecting couplings or joints using cat-heads E21B 19/16; rope, cable, or chain winding mechanisms, capstans B66D)
 E21B 3/08
·  Drives used in the borehole
 E21B 3/10
·  ·  Electric drives
 E21B 3/12
·  ·  Hydraulic or pneumatic drives
 E21B 5/00
Drives for combined percussion and rotary drilling, whether for use on surface or in the borehole
 E21B 7/00
Special methods or apparatus for deep-drilling
 E21B 7/02
·  Portable drilling rigs, truck- or skid-mounted, with their own drive
 E21B 7/04
·  Directional drilling
 E21B 7/06
·  ·  Deflecting the direction of boreholes
 E21B 7/08
·  ·  ·  Special devices for deflecting the boring, e.g. special drill bits, knuckle joints (knuckle joints for fishing tools E21B 31/00)
 E21B 7/10
·  ·  Correction of deflected boreholes
 E21B 7/12
·  Underwater drilling
 E21B 7/14
·  Flame drilling (flame piercing of blast holes E21C 21/00)
 E21B 7/16
·  Applying separate balls or pellets by the pressure of the drill, so-called shot-drilling
 E21B 7/18
·  Drilling by liquid or gas jets, with or without entrained pellets (E21B 7/14 takes precedence)
 E21B 9/00 - 
E21B 13/00
Drilling tools
 E21B 9/00
Drill bits, e.g. retractable without withdrawing drill pipe (for deflecting the boring E21B 7/08; valve drill bits E21B 27/00; augers for making post-holes or for making foundations E02D 17/14; augers for mine drilling E21C 1/14; drill bits for making blast holes E21C 13/00)
 E21B 9/02
·  Full drill bits
 E21B 9/04
·  ·  Twist drill bits
 E21B 9/06
·  ·  Fish-tail bits
 E21B 9/08
·  ·  Roller full drill bits
 E21B 9/10
·  ·  ·  with conical cutting tools only
 E21B 9/12
·  ·  ·  with separate inner and outer cutting tools, either cylindrical or conical
 E21B 9/14
·  ·  with disc-shaped cutting tools only
 E21B 9/16
·  Core bits, i.e. bits producing retrievable cores
 E21B 9/18
·  ·  Roller core bits
 E21B 9/20
·  ·  Core bits with inner tube for receiving or retaining the core
 E21B 9/22
·  Drill bits for enlarging the borehole locally or throughout the whole length
 E21B 9/24
·  ·  with non-expansible cutting tools revolving in relation to the drilling rods
 E21B 9/26
·  ·  with expansible cutting tools
 E21B 9/28
·  ·  ·  revolving in relation to the drilling rods
 E21B 9/30
·  ·  ·  at the circumference of the bit
 E21B 9/32
·  ·  ·  cutting also the bottom of the borehole
 E21B 9/34
·  for drilling holes sideways from, or at an angle to, the main borehole
 E21B 9/35
·  Parts or details
 E21B 9/36
·  ·  Special construction of diamond drill bits or wear-resisting inserts
 E21B 11/00
Other drilling tools
 E21B 11/02
·  Boring rams
 E21B 11/04
·  Boring grabs
 E21B 11/06
·  with driven cutting chains or similarly-driven tools
 E21B 13/00
Wear indicators for drilling tools
 E21B 15/00 - 
E21B 41/00
Other details for deep-drilling
 E21B 15/00
Derricks; Masts
 E21B 15/02
·  for underwater drilling (floating artificial islands B63B 35/44; drilling platforms on legs E02B 17/00)
 E21B 17/00
Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Casings; Tubings (rod couplings in general F16D; tubes or tube couplings in general F16L)
 E21B 17/02
·  Couplings; Joints
 E21B 17/04
·  ·  between rod and bit, or between rod and rod
 E21B 17/042
·  ·  ·  threaded
 E21B 17/043
·  ·  ·  ·  with locking means
 E21B 17/046
·  ·  ·  with ribs, pins, or jaws, and complementary grooves or the like, e.g. bayonet catches
 E21B 17/05
·  ·  ·  Swivel joints
 E21B 17/06
·  ·  ·  Releasing-joints, e.g. safety joints
 E21B 17/08
·  ·  Casing joints
 E21B 17/10
·  Wear protectors; Centralising devices
 E21B 17/12
·  ·  Devices for placing or drawing out wear protectors
 E21B 17/14
·  Casing shoes
 E21B 19/00
Handling rods, casings, tubes or the in the derrick (surface drives E21B 1/02, E21B 3/02)
 E21B 19/02
·  Rod or cable suspensions (load-engaging elements for hoisting or lowering purposes in general B66C 1/00; crown blocks or pulley blocks B66D; cable guides B66D 1/36)
 E21B 19/04
·  ·  Hooks
 E21B 19/06
·  ·  Elevators, i.e. rod- or tube-gripping devices
 E21B 19/07
·  ·  ·  Slip-type elevators (slips in rotary tables E21B 19/10)
 E21B 19/08
·  Devices for feeding the rods or cables (hoisting drums B66D); Devices for increasing or decreasing the pressure on the drill; Devices for counterbalancing the weight of the rods
 E21B 19/10
·  Slips; Spiders
 E21B 19/12
·  Rope clamps (rope clamps in general F16G 11/00)
 E21B 19/14
·  Racks, ramps, troughs or bins, for holding the lengths of rod singly or connected as joints; Handling between storage and borehole
 E21B 19/16
·  Connecting or disconnecting pipe couplings or joints (pipe wrenches or the like B25B)
 E21B 21/00
Devices or methods for flushing boreholes (mudscreens B03B; well drilling compositions C09K 7/00)
 E21B 21/02
·  Swivel joints in hose lines
 E21B 21/04
( transferred to C09K 7/00 )
 E21B 23/00
Devices for setting, locking, releasing or removing tools, packers or the like in boreholes (setting of casings, screens, or liners E21B 43/10)
 E21B 23/02
·  for locking the tools or the like in landing nipples or in recesses between adjacent sections of tubing (E21B 23/04-E21B 23/06 take precedence)
 E21B 23/04
·  operated by fluid means, e.g. actuated by explosion (E21B 23/06 takes precedence)
 E21B 23/06
·  for setting packers
 E21B 25/00
Core barrels; Core breakers; Core extractors
 E21B 27/00
Bailers (cement bailers E21B 33/132); Valve drill bits
 E21B 29/00
Cutting of pipes, packers, plugs, or wire lines, located in boreholes, e.g. of damaged pipes, making windows (perforators E21B 43/11); Reconditioning of well casings while in the ground
 E21B 29/02
·  by explosives
 E21B 31/00
Fishing tools for rods, casings, ropes, bits, fragments, etc.
 E21B 31/02
·  for tubular, cylindrical, or conical objects, rods, pipes, drill-bit shanks, casings, packers, lining (E21B 31/12 takes precedence)
 E21B 31/04
·  for irregularly-shaped objects, e.g. bailers, pump parts, instruments, drill-bit bodies, stones (E21B 31/12 takes precedence)
 E21B 31/06
·  ·  gripping magnetically
 E21B 31/08
·  ·  using junk baskets or the like
 E21B 31/10
·  for parted wire lines or ropes
 E21B 31/12
·  Fishing tongs; Fishing grabes
 E21B 33/00
Sealing or packing boreholes
 E21B 33/02
·  Surface sealing or packing
 E21B 33/03
·  ·  Well heads
 E21B 33/035
·  ·  ·  specially adapted for underwater installations
 E21B 33/04
·  ·  ·  Casing heads
 E21B 33/05
·  ·  ·  ·  Cementing heads, e.g. with provisions for introducing cementing plugs
 E21B 33/06
·  ·  ·  ·  Blow-out preventers
 E21B 33/08
·  ·  Wipers; Oil savers
 E21B 33/10
·  in the borehole
 E21B 33/12
·  ·  Packers; Plugs (used for cementing E21B 33/134, E21B 33/16)
 E21B 33/122
·  ·  ·  Multiple-string packers
 E21B 33/124
·  ·  ·  Units with longitudinally-spaced plugs for isolating the intermediate space
 E21B 33/126
·  ·  ·  with fluid-pressure-operated elastic cup or skirt (E21B 33/122, E21B 33/124 take precedence)
 E21B 33/127
·  ·  ·  with inflatable sleeve (E21B 33/122, E21B 33/124 take precedence)
 E21B 33/128
·  ·  ·  with a member expanded radially by axial pressure (E21B 33/122, E21B 33/124 take precedence)
 E21B 33/129
·  ·  ·  with mechanical slips for hooking into the casing (E21B 33/122, E21B 33/124 take precedence)
 E21B 33/13
·  ·  Methods or devices for cementing, for plugging holes, crevices, or the like
 E21B 33/132
·  ·  ·  Cement bailers
 E21B 33/134
·  ·  ·  Bridging plugs
 E21B 33/136
·  ·  ·  Baskets, e.g. of umbrella type
 E21B 33/138
·  ·  ·  Plastering the borehole wall; Injecting into the formation
 E21B 33/14
·  ·  ·  for cementing casings into boreholes
 E21B 33/16
·  ·  ·  ·  using plugs for isolating cement charge; Plugs therefor
 E21B 35/00
Devices or methods for preventing or extinguishing fires (fire fighting in general A62C, A62D)
 E21B 37/00
Cleaning devices for boreholes (E21B 21/00 takes precedence; devices for cleaning pipes B08B 9/02)
 E21B 37/02
·  Scrapers specially adapted therefor
 E21B 39/00
Gas or water separators or the like for use in the borehole
 E21B 40/00
Tubing catchers, automatically arresting the fall of oil-well tubing
 E21B 41/00
Other details not mentioned before for deep-drilling
 E21B 43/00
Devices or methods for obtaining oil, gas, water, soluble materials from deep wells (mining of oil-bearing deposits E21C 41/00; pumps F04)
 E21B 43/01
·  specially adapted for obtaining from underwater installations
 E21B 43/02
·  Subsoil filtering (E21B 43/11 takes precedence)
 E21B 43/04
·  ·  Gravelling of wells
 E21B 43/08
·  ·  Screens or liners
 E21B 43/10
·  ·  Setting of casings, screens or liners in wells (setting of tools, packers or the like E21B 23/00)
 E21B 43/11
·  Perforators; Permeators
 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 43/116
·  ·  Gun or shaped-charge perforators
 E21B 43/117
·  ·  ·  Shaped-charge perforators (E21B 43/118 takes precedence)
 E21B 43/118
·  ·  ·  characterised by lowering in vertical position and subsequent tilting to operating position
 E21B 43/119
·  ·  Details, e.g. for locating perforating place or direction
 E21B 43/12
·  Methods or apparatus for regulating flow of oil to or in wells (E21B 43/25 takes precedence)
 E21B 43/14
·  Obtaining from a multiple-zone well
 E21B 43/16
·  Secondary recovery methods for obtaining oil (pumps F04)
 E21B 43/18
·  ·  Repressuring or vacuum methods
 E21B 43/20
·  ·  Displacing by water
 E21B 43/22
·  ·  Use of chemicals or bacterial activity (E21B 43/27 takes precedence; chemical features in extracting oils from oil sands or shales C10G)
 E21B 43/24
·  ·  Use of heat
 E21B 43/25
·  Methods for stimulating production
 E21B 43/26
·  ·  by forming crevices, e.g. by shooting by blasting
 E21B 43/27
·  ·  ·  by use of eroding chemicals, e.g. acids
 E21B 43/28
·  Dissolving soluble minerals, e.g. salt
 E21B 45/00 - 
E21B 49/00
Surveying or testing
 E21B 45/00
Measuring the drilling time or rate of penetration
 E21B 47/00
Survey of wells (geophysical logging G01V)
 E21B 47/02
·  Determining slope or direction (clinometers or direction meters G01C)
 E21B 47/022
·  ·  of the borehole
 E21B 47/024
·  ·  of devices in the borehole (E21B 47/022 takes precedence)
 E21B 47/026
·  ·  of penetrated ground layers (formation testing E21B 49/00)
 E21B 47/04
·  Measuring depth or liquid level (measuring liquid level in general G01F)
 E21B 47/06
·  Measuring temperature or pressure (measuring temperature in general G01K; measuring pressure in general G01L)
 E21B 47/08
·  Measuring the diameter (measuring diameter in general G01B)
 E21B 47/10
·  Locating fluid leaks, intrusions, or movements
 E21B 47/12
·  Means for transmitting measuring-signals from the well to the surface (remote indicating in general G01D, G08)
 E21B 49/00
Testing the nature of borehole walls; Formation testing
 E21B 49/02
·  by mechanically taking samples of the soil (devices for taking samples in general G01N)
 E21B 49/04
·  ·  with projectiles penetrating the wall
 E21B 49/06
·  ·  with side-wall drilling tools or scrapers