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)
03/1981
03/03/1981US4253530 Method and system for circulating a gas bubble from a well
02/1981
02/17/1981US4250974 Apparatus and method for detecting abnormal drilling conditions
02/17/1981US4250972 Pneumatic ram boring device
02/17/1981US4250966 Insertion type cementing baffle
02/10/1981US4249611 Marine conductor string provided with a connector and a connector for use in such a marine conductor string
02/10/1981CA1095501A1 Flow control valve for rock bits
02/03/1981US4248264 Internal mud saver valve
02/03/1981CA1095093A1 Method and device for breaking a hard compact material
01/1981
01/28/1981EP0022865A1 Hydraulically-driven downhole drill
01/27/1981US4247403 Method of sealing pores, and lost circulation additive therefor
01/27/1981US4247312 Drilling fluid circulation system
01/27/1981US4246975 Wellbore drilling technique using eccentric tool joints to mitigate pressure-differential sticking
01/20/1981US4245710 Centrifugal water-air separation in earth drilling bits
01/20/1981US4245708 Blade stabilizer provided with at least one fluid passage having a venturi effect, in particular for use in combination with a drill bit
01/20/1981US4245672 Sealing valve for sludge scavenging system
01/20/1981CA1093806A1 Biodegradable foaming agent in drilling and workover operations
01/13/1981US4244431 Drilling apparatus with dual drill pipe and cross-over
01/06/1981US4243252 Dual concentric pipe joint
01/06/1981US4243113 Drilling head of a rotary impact drill
01/06/1981CA1092855A1 Method and apparatus for measuring volume and density of fluids by a drilling fluid system
12/1980
12/30/1980US4242146 Absorption, compaction
12/30/1980US4241797 Impact tool for dislodging stuck drill bits
12/16/1980US4239396 Method and apparatus for blending liquids and solids
12/11/1980WO1980002719A1 Method of separating weighting material from drilling mud
12/11/1980WO1980002718A1 Method of drilling productive stratum
12/11/1980WO1980002717A1 Method and device for earth-rock probing and rock drilling by a percussion drill
12/11/1980WO1980002716A1 Device for rectification of drilling mud
12/09/1980US4237977 Removal of water from gas well borehole with solid foaming agent
12/09/1980CA1091083A1 Thickening compositions containing xanthan gum, guar gum and starch
11/1980
11/25/1980US4235552 Fluid mixing system
11/18/1980US4234421 Land restoration following oil-well drilling
11/18/1980US4234413 Method and apparatus for self-cleaning drilling mud separation system
11/18/1980US4234047 Disconnectable riser for deep water operation
11/04/1980US4231436 Marine riser insert sleeves
10/1980
10/15/1980EP0017518A1 Rotary drilling machine and drilling method using this machine
10/14/1980US4227583 Method and apparatus for sinking shafts
10/14/1980CA1087640A1 Surface drilling apparatus
10/07/1980US4226726 Desilter
10/07/1980US4226447 Swivel apparatus
10/07/1980CA1087165A1 Means for drilling
10/02/1980WO1980002053A1 Method of continuous logging of borehole
10/02/1980WO1980002052A1 Method for determining the depth of occurrence of chemically aggressive stratum
10/02/1980WO1980002051A1 Apparatus for well logging while drilling
10/02/1980WO1980002050A1 Method for determining the depth of occurrence of fluid saturated stratum and the type of fluid
10/02/1980WO1980002049A1 Method and device for filling up the borehole
10/02/1980WO1980002048A1 Device for electrophoretic rectification of drilling mud
10/02/1980WO1980002047A1 Method and device for separating the solid phase from the drilling mud
10/02/1980WO1980002046A1 Method and device for processing the drilling mud
10/02/1980WO1980002045A1 Device for electrokinetic separation of the drilling mud into liquid and solid phases
10/02/1980WO1980002044A1 Method of separation of solid phase in the drilling mud
10/02/1980WO1980002043A1 Device for degassing the drilling mud
10/02/1980WO1980002042A1 Device for electrokinetic separation of drilling mud
10/02/1980WO1980002041A1 Method of separation of solid phase in the drilling mud
10/02/1980WO1980002040A1 Method of controlling the quality of drilling mud
10/02/1980WO1980002039A1 Method of control of process of dispersion of solid phase in a liquid phase
10/02/1980WO1980002038A1 Method of maintaining preset parameters of drilling mud
10/02/1980WO1980001996A1 Device for rectification of drilling mud
10/02/1980WO1980001994A1 Device for preparation of drilling mud
10/02/1980WO1980001993A1 Method and device for preparation of drilling mud
10/01/1980EP0016304A1 Choke for controlling the flow of drilling mud
09/1980
09/30/1980US4224989 Method of dynamically killing a well blowout
09/30/1980US4224988 Device for and method of sensing conditions in a well bore
09/23/1980US4223748 Method of collecting dust during rock drilling and a dust collecting suction system for a rock drilling apparatus
09/23/1980US4223747 Drilling using reverse circulation
09/23/1980CA1086239A1 Method and apparatus for the degasification of fluids
09/16/1980US4222988 Heater to vaporize, mill to shear
09/16/1980US4222444 Method of well fluid leak prevention
09/16/1980CA1085598A1 Method of reducing drag and rotating torque in the rotary drilling of oil and gas wells
09/09/1980US4221503 Drilling method and apparatus for large diameter pipe
09/02/1980US4220207 Seafloor diverter
09/02/1980US4220176 Methods and apparatus for controlling fluid flow
08/1980
08/26/1980US4219087 Enlarged bore hole drilling method
08/26/1980CA1084251A1 Drilling fluid lubricant
08/26/1980CA1084250A1 Controlling corrosion in gas-containing aqueous drilling fluid
08/19/1980US4217965 Cottonseed hulls, bentonite, and surfactant to seal porous formations
08/19/1980US4217709 Submarine sand sampler
08/12/1980US4217208 Method for separating solid lubricating material from drill cuttings
08/12/1980US4216836 Process and system for recovering solid particulate additives from a drilling fluid
08/05/1980US4215753 Drilling fluid cooling system
07/1980
07/29/1980US4214879 Degassing apparatus
07/24/1980WO1980001499A1 Method of regeneration of drilling mud
07/24/1980WO1980001498A1 Method and device for separating the solid phase in a drilling mud
07/24/1980WO1980001497A1 Device for dispersing and homogenizing drilling mud
07/24/1980WO1980001496A1 Method for controlling a drilling mud dispersing process
07/24/1980WO1980001495A1 Method and device for preparing a drilling mud
07/24/1980WO1980001469A1 Method and device for preparing a drilling mud
07/22/1980US4213740 Oilfield pump stroke monitor
07/22/1980US4213508 Downhole fire control
07/15/1980CA1081685A1 Nutating drill bit
07/01/1980US4210208 Subsea choke and riser pressure equalization system
06/1980
06/26/1980WO1980001300A1 Hydraulically-driven downhole drill
06/17/1980US4208285 Drill cuttings disposal system with good environmental and ecological properties
06/10/1980US4207017 Earthen tank and liner
06/03/1980CA1078817A1 Check valve for rock drill
05/1980
05/27/1980US4204715 Method and device for breaking a hard compact material
05/27/1980CA1078369A1 Device whereby a duct in a deep bore hole is supported and moved up or down by reaction against the bore hole surface
04/1980
04/29/1980US4200160 Sweep pickup for a big hole bit
04/29/1980CA1076552A1 Process and installation for drilling holes in the earth's crust under freezing conditions
04/17/1980WO1980000726A1 Method and device for control of structure-mechanical properties of drilling mud
04/08/1980US4196783 Device for boring
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