| More topics under "E21B - Earth or rock drilling; Obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells" (324,830) |
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| E21B 1 - Percussion drilling (2,080) | | E21B 10 - Drill bits (19,464) | | E21B 11 - Other drilling tools (454) | | E21B 12 - Accessories for drilling tools (993) | | E21B 15 - Supports for the drilling machine, e.g. derricks or masts (4,619) | | E21B 17 - Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Casings; Tubings (27,800) | | E21B 19 - Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables (17,198) | | E21B 21 - Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor (13,780) | | E21B 23 - Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells (12,712) | | E21B 25 - Apparatus for obtaining or removing undisturbed cores, e.g. core barrels, core extractors (2,102) | | E21B 27 - Containers for collecting or depositing substances in boreholes or wells, e.g. bailers for collecting mud or sand; Drill bits with means for collecting substances, e.g. valve drill bits (1,068) | | E21B 28 - Vibration generating arrangements for boreholes or wells, e.g. for stimulating production (888) | | E21B 29 - Cutting or destroying pipes, packers, plugs, or wire lines, located in boreholes or wells, e.g. cutting of damaged pipes, of windows; Deforming of pipes in boreholes or wells; Reconditioning of well casings while in the ground (5,744) | | E21B 3 - Rotary drilling (4,061) | | E21B 31 - Fishing for or freeing objects in boreholes or wells (3,788) | | E21B 33 - Sealing or packing boreholes or wells (33,564) | | E21B 34 - Valve arrangements for boreholes or wells (14,685) | | E21B 35 - Methods or apparatus for preventing or extinguishing fires (324) | | E21B 36 - Heating, cooling, or insulating arrangements for boreholes or wells, e.g. for use in permafrost zones (4,262) | | E21B 37 - Methods or apparatus for cleaning boreholes or wells (5,129) | | E21B 4 - Drives for drilling, used in the borehole (6,032) | | E21B 40 - Tubing catchers, automatically arresting the fall of oil-well tubing (79) | | E21B 41 - Equipment or details not covered by groups (7,984) | | E21B 43 - Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells (64,186) | | E21B 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; Systems specially adapted for monitoring a plurality of drilling variables or conditions (5,356) | | E21B 45 - Measuring the drilling time or rate of penetration (257) | | E21B 47 - Survey of boreholes or wells (31,352) | | E21B 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 (11,875) | | E21B 6 - Drives for drilling with combined rotary and percussive action (930) | | E21B 7 - Special methods or apparatus for drilling (22,064) |
| Patents for E21B - Earth or rock drilling; Obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells (2,021) |
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| 01/20/1983 | WO1983000183A1 Hydraulic down-the-hole rock drill | | 12/21/1982 | CA1137740A1 Polyether polyol for petroleum recovery | | 11/30/1982 | CA1136395A1 Acylated polyether polyol for petroleum recovery | | 10/06/1982 | EP0061473A1 System for transferring pipe. | | 10/05/1982 | CA1132783A1 Method of consolidating parts of permeable underground formation using dimethylaminomethylphenol | | 09/22/1982 | EP0060295A1 Tube handling apparatus. | | 03/18/1982 | WO1982000853A1 Tubular handling apparatus | | 03/18/1982 | WO1982000852A1 Pipe handling system with apron and stacking arms | | 08/25/1981 | CA1107661A1 Collection and separation of uncontrolled blow out material from bore holes in the ocean floor | | 07/07/1981 | CA1104552A1 Floating seal for drill bits | | 05/19/1981 | CA1101407A1 Drill string | | 02/17/1981 | CA1095888A1 Tapered screw joint and device for emergency recovery of boring tool from borehole with the use of said joint | | 09/09/1980 | CA1085377A1 Casing tong | | 05/27/1980 | CA1078369A1 Device whereby a duct in a deep bore hole is supported and moved up or down by reaction against the bore hole surface | | 02/26/1980 | CA1072454A1 Filtering device with v-shaped belt, and packing with glass balls | | 02/27/1979 | US4141414 Device for supporting, raising and lowering duct in deep bore hole | | 01/16/1979 | CA1046497A1 Rotary rock bit with multiple row coverage for very hard formations | | 07/18/1978 | US4100753 Marine structure with riser conductor and pipeline connection | | 07/04/1978 | CA1034111A1 Hammer drills | | 11/22/1977 | US4059279 Hollow percussion drill rod with seal for cleaning fluid inlet tube | | 08/23/1977 | US4043407 Drilling sampling/testing equipment |
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