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earth drilling (794518) 794518
earth drilling, e.g. deep drilling (794518) 794518
fixed constructions (794518) 794518
mining (794518) 794518
obtaining oil, gas, water, soluble or meltable materials or aslurry of minerals from wells (794518) 794518
blasting (92200) 92200
heating (92200) 92200
lighting (92200) 92200
mechanical engineering (92200) 92200
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performing operations (83583) 83583
transporting (83583) 83583
physics (76414) 76414
chemistry (70869) 70869
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measuring (60408) 60408
testing (60408) 60408
engineering elements and units (56023) 56023
general measures for producing and maintaining effectivefunctioning of machines or installations (56023) 56023
thermal insulation in general (56023) 56023
adhesives (48660) 48660
dyes (48660) 48660
miscellaneous applications of materials (48660) 48660
miscellaneous compositions (48660) 48660
natural resins (48660) 48660
paints (48660) 48660
polishes (48660) 48660
materials for miscellaneous applications, not provided forelsewhere (48126) 48126
general tagging of cross-sectional technologies spanning over several sections of the ipc (47506) 47506
general tagging of new technological developments (47506) 47506
technical subjects covered by former uspc cross-reference art collections [xracs] and digests (47506) 47506
technical subjects covered by former uspc (39705) 39705
detecting masses or objects (32467) 32467
geophysics (32467) 32467
gravitational measurements (32467) 32467
joints or fittings for pipes (31666) 31666
means for thermal insulation in general (31666) 31666
pipes (31666) 31666
supports for pipes, cables or protective tubing (31666) 31666
technical subjects covered by former us classification (29170) 29170
foundations (28580) 28580
hydraulic engineering (28580) 28580
soil shifting (28580) 28580
electricity (19876) 19876
embankments (18746) 18746
excavations (18746) 18746
underground or underwater structures (18746) 18746
physical or chemical processes or apparatus in general (18677) 18677
positive displacement machines for liquids (17692) 17692
pumps for liquids or elastic fluids (17692) 17692
investigating or analysing materials by determining theirchemical or physical properties (17251) 17251
shafts (15803) 15803
machine tools (13762) 13762
metal-working not otherwise provided for (13762) 13762
calculating (13222) 13222
computing (13222) 13222
counting (13222) 13222
separation (12900) 12900
hand tools (12275) 12275
manipulators (12275) 12275
portable power-driven tools (12275) 12275
technical subjects covered by former uspc cross-reference artcollections [xracs] and digests (12090) 12090
galleries (11915) 11915
large underground chambers (11915) 11915
tunnels (11915) 11915
pumps (10986) 10986
related equipment (10939) 10939
ships or other waterborne vessels (10939) 10939
equipment for shipping (9593) 9593
mining or quarrying (9111) 9111
electric digital data processing (9096) 9096
percussive tools (8970) 8970
technologies or applications for mitigation or adaptation againstclimate change (8715) 8715
actuating-floats (8214) 8214
cocks (8214) 8214
devices for venting or aerating (8214) 8214
taps (8214) 8214
valves (8214) 8214
artificial stone (8068) 8068
cements (8068) 8068
ceramics (8068) 8068
compositions thereof, e.g. mortars, concrete or like buildingmaterials (8068) 8068
concrete (8068) 8068
lime, magnesia (8068) 8068
refractories (8068) 8068
slag (8068) 8068
treatment of natural stone (8068) 8068
dredging (7754) 7754
soil-shifting (7754) 7754
basic electric elements (7669) 7669
fuels (6941) 6941
lubricants (6941) 6941
peat (6941) 6941
petroleum, gas or coke industries (6941) 6941
technical gases containing carbon monoxide (6941) 6941
conversion or distribution of electric power (6640) 6640
generation (6640) 6640
ferrous or non-ferrous alloys (6635) 6635
treatment of alloys or non-ferrous metals (6635) 6635
compositions based thereon (6054) 6054
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Chinese (141223) 141223
German (66004) 66004
Russian (46761) 46761
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Spanish (15594) 15594
Portuguese (14729) 14729
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03/2020
The utility model provides an oil-gas well sampler. The oil-gas well sampler comprises a sampling joint and a sample container connected with the sampling joint... 
EARTH DRILLING, e.g. DEEP DRILLING | FIXED CONSTRUCTIONS | EARTH DRILLING | OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS | MINING
Patent
06/2020
The utility model discloses a packer for an oil-gas well. The device comprises a connecting pipe and a fixing pipe, one end of the connecting pipe is connected with a fixed pipe... 
EARTH DRILLING, e.g. DEEP DRILLING | FIXED CONSTRUCTIONS | EARTH DRILLING | OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS | MINING
Patent
06/2020
The utility model discloses an oil well casing gas recovery device. The device comprises a clamp head, a double-male connector, an elbow, an air outlet valve... 
EARTH DRILLING, e.g. DEEP DRILLING | FIXED CONSTRUCTIONS | EARTH DRILLING | OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS | MINING
Patent
05/2020
The present invention relates to a method for stimulating oil wells to increase oil and/or gas production... 
EARTH DRILLING, e.g. DEEP DRILLING | FIXED CONSTRUCTIONS | EARTH DRILLING | OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS | MINING
Patent
06/2020
The utility model discloses an oil casing for a coal-bed gas well. The device comprises a pipeline, a sleeve and an inner ring, pipelines are mounted on the left side and the right side of an inner cavity of the sleeve... 
EARTH DRILLING, e.g. DEEP DRILLING | FIXED CONSTRUCTIONS | EARTH DRILLING | OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS | MINING
Patent
06/2020
Disclosed is an intelligent oil well electric water plugging tool. The intelligent oil well electric water plugging tool comprises a first central pipe... 
EARTH DRILLING, e.g. DEEP DRILLING | FIXED CONSTRUCTIONS | EARTH DRILLING | OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS | MINING
Patent
06/2020
The utility model relates to the technical field of oil extraction machinery. The utility model discloses a water injection device for an oil production well... 
EARTH DRILLING, e.g. DEEP DRILLING | FIXED CONSTRUCTIONS | EARTH DRILLING | OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS | MINING
Patent
07/2020
The invention relates to the technical field of natural gas exploitation, and discloses a natural gas well group... 
EARTH DRILLING, e.g. DEEP DRILLING | FIXED CONSTRUCTIONS | EARTH DRILLING | OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS | MINING
Patent
06/2020
The utility model relates to a hydraulic booster for fishing an oil-water well. According to the technical scheme, the outer wall of the lower end of an upper... 
EARTH DRILLING, e.g. DEEP DRILLING | FIXED CONSTRUCTIONS | EARTH DRILLING | OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS | MINING
Patent
04/2020
The utility model relates to an oil-gas well ground maintenance auxiliary device which adopts the technical scheme that a fixed barrel is arranged above a fixed block, a sliding barrel is arranged... 
EARTH DRILLING, e.g. DEEP DRILLING | FIXED CONSTRUCTIONS | EARTH DRILLING | OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS | MINING
Patent
06/2020
The utility model provides an oil well sampling device. The device comprises a separation part, a liquid collection part and a top cover part, the top end of the separation part is connected with thetop cover part... 
EARTH DRILLING, e.g. DEEP DRILLING | FIXED CONSTRUCTIONS | EARTH DRILLING | OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS | MINING
Patent
07/2020
The invention provides an oil well associated gas recovery device. The oil well associated gas recovery device comprises a casing gas pipe, an oil outlet pipe and a casing gas inlet pipe... 
EARTH DRILLING, e.g. DEEP DRILLING | FIXED CONSTRUCTIONS | EARTH DRILLING | OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS | MINING
Patent
06/2020
The utility model relates to the field of oil-gas well testing. The utility model relates to a wellhead device, in particular to an oil-gas well formation test... 
EARTH DRILLING, e.g. DEEP DRILLING | FIXED CONSTRUCTIONS | EARTH DRILLING | OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS | MINING
Patent
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