Patents
Sitemap › E21 - Earth or rock drilling; Mining › E21B - Earth or rock drilling; Obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells › E21B 21 - Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
Patents for E21B 21 - Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor (13,780)
03/1996
03/27/1996EP0702745A1 Non-cryogenic production of nitrogen for on-site injection in downhole drilling
03/27/1996EP0460067B1 Water-wettable drilling mud additives containing uintaite
03/26/1996US5501280 For running a casing string into a well bore
03/26/1996US5501277 Combating lost circulation during the drilling of wells
03/21/1996WO1996008632A1 Drill rod
03/20/1996EP0496850B1 Drill cuttings disposal method and system
03/19/1996US5499687 Downhole valve for oil/gas well
03/19/1996US5499682 Method for setting a slotted face wellbore deviation assembly using a rectilinear setting tool
03/12/1996US5498596 Olefins, polyolefins, paraffins
03/12/1996US5498120 Mud pan apparatus
03/12/1996US5497841 For reinforcing a structure
03/12/1996US5497839 Liquid-driven downhole hammer drill
03/07/1996WO1996007009A2 Casing and filling circulating head
03/06/1996EP0553309B1 Drilling pipe
03/06/1996CN1031211C Method for treatment of waste well-drilling liquid
03/05/1996US5495986 Liquid fuel, solid waste material
03/01/1996CA2132458A1 Multi- port oilfield liner connector
02/1996
02/29/1996WO1996005945A1 Hydraulic percussion hammer
02/27/1996USRE35163 Preparing additive by mixing high and low softening point uintaite solids, causticized lignite, strongly lipophilic nonionic surfactant
02/27/1996US5494584 Method and apparatus for controlling a pump upstream of a centrifuge
02/27/1996US5494119 In percussion type downhole drilling equipment
02/27/1996US5494107 Reverse cementing system and method
02/22/1996WO1996005408A1 Method of and system for flushing boreholes
02/22/1996CA2197477A1 Method of and system for flushing boreholes
02/21/1996EP0697495A2 Apparatus for sucking off drill cuttings
02/15/1996WO1996004458A1 Erosion resistant downhole mud diverter tool
02/15/1996CA2195982A1 Erosion resistant downhole mud diverter tool
02/13/1996US5490571 Sub-assembly for dust suppression in rock drilling
02/07/1996EP0695333A1 Removing fines from a spent aqueous well treating fluid
02/06/1996CA2055030C Mobile drilling rig for closely spaced well centers
01/1996
01/30/1996CA2151410A1 Fluid circulation apparatus
01/24/1996EP0693004A1 Screen for separating solids from drilling fluid
01/23/1996CA2007070C Dry pneumatic system for hard rock shaft drilling
01/17/1996EP0692062A1 Down-hole hammer drill having reverse circulation and drill bit for the hammer drill
01/16/1996US5484232 Method for injecting lubricant and filler in the pipe-jacking method
01/16/1996US5484028 Method of drilling with fluid including nut cork and drilling fluid additive
01/16/1996US5483987 Remote control method and device for actuating an equipment-application to a drill string
01/10/1996EP0691454A1 Fluid systems for controlling fluid losses during hydrocarbon recovery operations
01/10/1996EP0690953A1 Drilling column with sledgehammer drilling head
01/10/1996EP0690899A1 Non toxic, biodegradable well fluids
01/04/1996DE4423670A1 Cooling water collector for core drills and saws on concrete walls
01/02/1996US5479988 Mud check valves in drilling apparatus (wells)
12/1995
12/19/1995CA2007461C Whipstock starter mill with pressure drop tattletale
12/15/1995CA2140694A1 Drilling a well with gas supply in the drilling liquid
12/13/1995EP0686752A1 Directional drilling methods and apparatus
12/12/1995US5474133 Method for retreiving a slotted face wellbore deviation assembly using a retrieval tool
12/12/1995US5474125 Retrieval tool for use with a slotted face wellbore deviation assembly
12/07/1995WO1995033120A1 A well entry tool
12/07/1995WO1995033119A1 Drilling apparatus
12/06/1995CN2214517Y Immersion slurry solidifying and controlling device
12/05/1995US5472620 Solid-liquid separation process using at least one polymer and cavitation energy
11/1995
11/28/1995CA2043410C Seafloor drilling apparatus
11/23/1995DE4433533C1 Hydraulic ram=type drill
11/22/1995EP0682738A1 Drilling apparatus.
11/21/1995US5467835 Drilling or chiseling tool with suction apparatus
11/21/1995US5467821 Rectilinear tool for use with a slotted face wellbore deviation assembly
11/21/1995US5467820 Slotted face wellbore deviation assembly
11/16/1995WO1995023273A3 Whipstock apparatus and methods of use
11/15/1995CN1111735A WK splitter
11/14/1995US5465787 For interconnection with a wellbore tubing string
11/02/1995EP0679795A2 Method of controlling fluid loss in a permeable formation
11/02/1995EP0553134B1 A method of disposing of drilling wastes
10/1995
10/26/1995DE4427149C1 Drill bit with insertion end into hammer drill
10/25/1995EP0678149A1 Masonry coring system
10/18/1995EP0677641A1 Method for optimizing the characteristics of an axial fluid flow in a variable annular space around the string
10/18/1995CN2210249Y Automatic vacuum distillation gas remover for well drilling liquid
10/17/1995CA2006766C Method and apparatus for sampling the gaseous content of a liquid
10/16/1995CA2147088A1 Method for optimizing the axial circulation characteristics of a fluid circulating in a variable annular space around a cylinder
10/12/1995WO1995027222A1 Acoustic sensor
10/11/1995EP0676002A1 Anti-rotation devices for use with well tools
10/11/1995EP0675937A1 Rheologically controlled, pumpable, fluid aqueous preparations for use for instance as water-based drilling fluids
10/10/1995CA2013786C Flushing means for drilling tools
10/03/1995US5454957 oil well wastes
09/1995
09/28/1995WO1995025874A1 Valve for use in float equipment
09/28/1995WO1995025873A1 Fill valve
09/28/1995CA2172627A1 Fill valve
09/21/1995WO1995025216A1 Manipulator-arm for auxiliary-tool for the joining of drillpipe
09/19/1995US5450903 Fill valve
09/13/1995EP0671547A1 Ultrasonic measurement apparatus and method for boreholes
09/06/1995CN1029700C An apparatus and method for removing debris from a drillhole
09/05/1995US5447200 Method and apparatus for downhole sand clean-out operations in the petroleum industry
08/1995
08/31/1995WO1995023273A2 Whipstock apparatus and methods of use
08/31/1995DE4294552C2 Clearing of plug to restore well flow
08/22/1995US5443129 Apparatus and method for orienting and setting a hydraulically-actuatable tool in a borehole
08/17/1995WO1995021986A1 Drill casing installation equipment with external friction reducing means
08/10/1995WO1995021331A1 Severe service extractor valve
08/08/1995US5439057 Mixing aqueous fluid with polysaccharide viscosifier and metal ion or borate crosslinking agent to form crosslinked gel, shearing into particles, slurrying, introducing into wellbore, producing filter cake to reduce fluid loss
08/04/1995CA2140967A1 High pressure exhaust cleaning system
08/04/1995CA2140956A1 Severe service extractor valve
07/1995
07/25/1995US5435176 Hazardous waste characterizer and remediation method and system
07/12/1995EP0662563A1 Method using gellan for reducing the filtrate of aqueous drilling fluids
07/12/1995EP0662113A1 Pretreated clays, their preparation and use in formulating drilling muds not aggressive to layer clays
07/11/1995US5431236 Method for processing solid material for disposal in an underground porous formation
07/06/1995WO1995017982A1 Contaminant removal
07/06/1995CA2179295A1 Contaminant removal
07/05/1995EP0661412A1 Device and method for remote actuation of a downhole tool
06/1995
06/29/1995WO1995017244A1 Solvent soaps and methods employing same
06/29/1995CA2179720A1 Solvent soaps and methods employing same
06/27/1995US5427353 For opening/closing a cleanout opening in a settling tank well
06/27/1995US5427190 Underground borer with down hammer
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