Patents
Patents for E21B 17 - Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Casings; Tubings (27,800)
03/1994
03/01/1994US5290768 Welan gum-ethylene glycol insulating compositions
03/01/1994US5289889 Roller cone core bit with spiral stabilizers
03/01/1994US5289882 Sealed electrical conductor method and arrangement for use with a well bore in hazardous areas
03/01/1994CA2104986A1 Apparatus and method for coupling elongated members
02/1994
02/23/1994EP0583650A1 Method and device for underground introduction of long transport pipes into the earth
02/23/1994CN2157301Y Large-bore automatic centralising power chuck
02/23/1994CN1023871C Diameter-regulating centralizing device
02/22/1994US5288271 Constant velocity universal joint assembly for downhole motor
02/22/1994US5288173 Method for the directional control of an earth boring device as well as apparatus for making earth bores
02/22/1994US5287936 Rolling cone bit with shear cutting gage
02/22/1994US5287920 Large head downhole chemical cutting tool
02/22/1994CA2012033C Plastic bore seal
02/17/1994WO1994003703A1 Gravel pack screen for well completions
02/17/1994WO1994003700A1 Lightweight drill pipe
02/17/1994CA2140754A1 Gravel pack screen for well completions
02/16/1994CN2156279Y Smooth sealing device for oil pump
02/16/1994CN2156278Y Single wedge smooth rod clip for oil pump
02/16/1994CN2156277Y Rotary hollow oil suction rod liquid feeding pile
02/16/1994CN1082158A High torque connecting hoop
02/16/1994CN1082138A Hole opener for the top hole section of oil/gas wells
02/15/1994US5286393 Coating and bonding composition
02/15/1994US5286069 Stress relief groove for drill pipe
02/15/1994US5285846 Thermal mineral extraction system
02/08/1994US5285204 Coil tubing string and downhole generator
02/08/1994US5285008 For use in well operations
02/08/1994US5284216 Down-the-hole drill tool for drilling in advance of a casing tube
02/08/1994US5284214 Drill pipe coupling apparatus
02/08/1994US5284210 Top entry sub arrangement
02/03/1994DE4225009A1 Drill collar for rotary rock drilling - comprises eccentric imbalance to improve vertical drill string guiding
02/02/1994CN2154904Y Sleeve connector
02/02/1994CN1081490A Process for mfg. high-strength sucker cod
02/01/1994US5282696 Pneumatic ram pipe replacement
02/01/1994US5282653 Coupling apparatus
02/01/1994US5282508 Process to increase petroleum recovery from petroleum reservoirs
01/1994
01/26/1994EP0580271A2 Drill pipe
01/26/1994EP0579631A1 Water extraction components produced by adhesive bonds, process for their manufacture and their use.
01/26/1994CN2154342Y Pearl type correcting anti-drop apparatus of sucker rod
01/25/1994CA2097366A1 Drill pipe
01/20/1994WO1994001652A1 Joining tubing with a gas tight seal
01/19/1994EP0578681A1 Retrievable bridge plug and a running tool therefor.
01/18/1994US5279368 Anti-fouling covering for use in sub-sea structures
01/12/1994EP0577898A1 Stainless non-magnetic steel with high manganese and chromium content, resistant to stress corrosion and useful for drilling equipment, also the process for manufacturing rods from this steel
01/12/1994EP0577845A1 Device for positioning member and excavating direction control device for excavator employing said device
01/12/1994CN2152900Y Threaded quick-jointing bit rod joint
01/12/1994CN2152899Y Centralising device for sucker rod
01/11/1994US5277255 Well liner running shoe
01/11/1994US5277254 Helical rod guide
01/11/1994CA1326052C Pipe connector
01/07/1994CA2081941A1 Well tool and method of manufacture
01/06/1994WO1994000669A1 Method and apparatus for inspecting subsurface environments
01/06/1994CA2138013A1 Method and apparatus for inspecting subsurface environments
01/05/1994DE4312451A1 Connector for well plugging charges - has perforated side wall and perforated end coupling elements
01/05/1994DE4220636A1 Coupling sleeve for self-tapping injection anchors for flushing medium injection during percussion drilling - includes internal thread and axial abutment for screwed-in injection anchor
01/04/1994US5275845 Applying a ceramic based lubricant paste, oil and gas production equipment
01/04/1994US5275441 Blast joint with torque transferring connector
01/04/1994US5275246 Drill string bridge coupler and actuator
01/04/1994US5275245 Device to facilitate creating foxholes with explosives and method of making the same
01/04/1994US5275240 Method and apparatus for preventing casing damage due to formation compaction
01/04/1994US5275038 Downhole reeled tubing inspection system with fiberoptic cable
12/1993
12/29/1993EP0469133B1 Device for delivering corrosion or deposition inhibiting agents into a well by means of an auxiliary delivery tube
12/29/1993CN2151245Y Centrilizing device of pipe sucking pump
12/29/1993CN2151244Y Multifunctional joint
12/29/1993CN2151243Y Underground rotor location limitator of screw rod oil sucker
12/28/1993US5273123 Fitting for controlled trajectory drilling, comprising a variable angle elbow element and use of this fitting
12/23/1993WO1993026061A1 Electrical connector and pump assembly utilizing same
12/23/1993WO1993025794A1 Well drilling tools
12/22/1993EP0575114A1 Large head downhole chemical cutting tool
12/22/1993CN2150329Y Wax-scraping righting device for oil-pumping well
12/22/1993CN2150325Y Invert-buckled protective lifting short
12/22/1993CN2150324Y Integral cable AC electric-heating sucker rod
12/21/1993US5271630 Conduit seal
12/21/1993CA1325421C Drill rod for percussion drilling
12/16/1993DE4225806C1 Drilling bit mounting for boring large holes - has clamp within drilling tube with radial expansion against eccentric type carrier
12/15/1993EP0574102A1 Pretreatment process for the elements of a gastight pipe connection
12/15/1993EP0573483A1 Improvements in and relating to pipe connectors
12/15/1993CN2149474Y Centralising device for dring casing
12/15/1993CN2149473Y Oil sucking out equipment of ball locking channel type
12/15/1993CN1079531A Multiple layer casing system
12/14/1993US5269572 Apparatus and method for coupling elongated members
12/14/1993US5269570 Flexible casing for well boreholes
12/14/1993US5269377 Coil tubing supported electrical submersible pump
12/09/1993WO1993024728A1 Downhole tools
12/09/1993WO1993024708A1 Apparatus for drilling and maintenance of holes in a golf course
12/09/1993DE4232560C1 Earth-drilling auger device - has screw shaft bore provided with check valve
12/08/1993CN2148834Y Anti-dropping and anti-wearing jointing hoop for sucker rod
12/08/1993CN2148819Y Twist drilling rod
12/08/1993CN2148818Y Gravity balance sucker rod with crank rocker structure
12/07/1993USRE34467 Tubular connection
12/07/1993US5267621 Drill pipe breakout device
12/07/1993CA1324917C Reversible, articulated mechanical coupling and relevant seat, for anchorages under tension
12/01/1993CN1079021A Drill string component
11/1993
11/30/1993US5265684 Downhole adjustable stabilizer and method
11/30/1993US5265680 Method for installing instruments in wells
11/30/1993US5265675 Well conduit cutting and milling apparatus and method
11/30/1993US5265466 Rod insertion method and friction reducing device
11/25/1993DE4216747A1 Connector for force-locking flat connection of fixed and flexible pipes - comprises two screw threaded dishes fitted round area where normal screw fittings are impossible.
11/24/1993EP0571346A1 Drill string component
11/24/1993EP0570657A1 corrosion resistant pipe
11/24/1993CN2147346Y Multi-function well controlling pressure testing joint
11/24/1993CN2147341Y Pulse sleeve joint