| Patents for E21B 17 - Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Casings; Tubings (27,800) |
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| 10/25/1988 | US4779678 Sucker rod guide |
| 10/25/1988 | CA1243665A1 Drill strings, essentially for oil and gas well drilling, with receiving sections for clamping jaws |
| 10/19/1988 | EP0287183A2 Tubular element for use in a rotary drilling assembly |
| 10/19/1988 | EP0287155A2 Assembly for directional drilling of boreholes |
| 10/18/1988 | US4778359 One-piece connector assembly |
| 10/18/1988 | US4778008 Selectively releasable and reengagable expansion joint for subterranean well tubing strings |
| 10/12/1988 | EP0286500A1 Apparatus for controlled directional drilling, and process for controlling the apparatus |
| 10/12/1988 | EP0286373A2 Bit retaining ring for recovering drill string components |
| 10/12/1988 | EP0285889A2 Stabilizer for deep-drilling tools |
| 10/11/1988 | US4776436 Face shock absorber |
| 10/11/1988 | US4776410 Stabilizing tool for well drilling |
| 10/11/1988 | US4776397 Tool for lowering into centered position within a well bore |
| 10/11/1988 | US4776394 Hydraulic stabilizer for bore hole tool |
| 10/11/1988 | US4776393 Perforating gun automatic release mechanism |
| 10/06/1988 | WO1988007619A1 Driveable threaded tubular connection |
| 10/05/1988 | EP0285505A1 Process and device for controlling the path of a drill bit at a drill string |
| 10/05/1988 | EP0285473A1 Flapper pad arrangement for logging sonde |
| 10/05/1988 | CN87210737U Step-support type casinghead |
| 10/04/1988 | US4775009 Process and device for installing seismic sensors inside a petroleum production well |
| 09/28/1988 | EP0203074A4 Oilwell tubing connection. |
| 09/28/1988 | EP0151574B1 Improved tubular connection |
| 09/28/1988 | CN87212611U Sucker rod-jointing device |
| 09/28/1988 | CN87205499U Kelly bar rotating short-knot with antispray rotary plug |
| 09/27/1988 | US4773490 Use in subterranean mining |
| 09/27/1988 | US4773479 Placing a string of tubing in an oil field |
| 09/27/1988 | CA1242498A1 Quick change coupling |
| 09/27/1988 | CA1242474A1 Tubular connection with cylindrical and tapered stepped threads |
| 09/21/1988 | EP0171416B1 Insulating coupling for drill collars and method of manufacture thereof |
| 09/21/1988 | CN88200076U Hollow sucker rod |
| 09/21/1988 | CN88101914A Methods and apparatus for safely meaasuring downhole conditions and formation characteristics while drilling borehole |
| 09/20/1988 | US4772246 Downhole motor drive shaft universal joint assembly |
| 09/20/1988 | US4771830 Apparatus for positioning well tools in deviated well bores |
| 09/20/1988 | US4771811 Heavy wall drill pipe and method of manufacture of heavy wall drill pipe |
| 09/14/1988 | EP0282402A2 Methods and apparatus for safely measuring downhole conditions and formation characteristics while drilling a borehole |
| 09/14/1988 | CN87216722U Safety joint for drill rod |
| 09/14/1988 | CN87216378U Open-type safety joint |
| 09/13/1988 | US4770563 Device for connecting lines associated with an offshore drilling equipment |
| 09/13/1988 | US4770448 Pipe coupling |
| 09/13/1988 | US4770444 Joint for oil-or gas-field pipe |
| 09/13/1988 | US4770336 Well screen centralizer and method for constructing centralizer and for joining of well screens |
| 09/13/1988 | US4770258 Well deviation control tool |
| 09/13/1988 | US4770256 For consolidating lining of walls of a bore hole to prevent a cave-in |
| 09/13/1988 | US4770247 Subsea riser for multiple bore wells |
| 09/13/1988 | CA1241944A1 Sleeved drill string coupling, especially for traversing a flow loss zone |
| 09/07/1988 | EP0280705A1 Process and device for producing drilling holes from an angled position in relation to the drilling axes. |
| 09/07/1988 | EP0190264B1 Well pipe joint |
| 09/06/1988 | US4768984 Buoy having minimal motion characteristics |
| 09/06/1988 | US4768588 Connector assembly for a milling tool |
| 09/01/1988 | DE3805025A1 Centring cage for cylindrical components, in particular for casings and rising pipes |
| 08/31/1988 | CN87105805A Method and apparatus for multi-stage cementing of well casing |
| 08/30/1988 | US4767349 Wet electrical connector |
| 08/30/1988 | US4766663 Method of attaching member to a tubular string |
| 08/25/1988 | WO1988006209A1 Device for opening gas sources in refuse tips, and for exploring and cleansing materials for recycling and contaminated ground |
| 08/24/1988 | EP0152406B1 Pipe joint |
| 08/23/1988 | US4766442 Antenna structure for use with a transmitter located at a great depth |
| 08/23/1988 | US4765418 Borehole drill construction |
| 08/23/1988 | US4765417 Reaming apparatus for well drilling |
| 08/18/1988 | DE3703580A1 Driving tube and process for producing a tunnel in underground shield driving |
| 08/17/1988 | EP0278730A2 Hydraulic stabilizer for bore hole tool |
| 08/16/1988 | US4763734 Earth drilling method and apparatus using multiple hydraulic forces |
| 08/16/1988 | CA1240566A1 Flotation riser |
| 08/10/1988 | EP0277475A2 Gas-tight connection for a casing or tubing |
| 08/10/1988 | EP0277433A1 Device for upholding the rectilinearity of a borehole |
| 08/09/1988 | US4762344 Well casing connection |
| 08/09/1988 | CA1240310A1 Apparatus and method for driving casing and conductor pipe |
| 08/09/1988 | CA1240309A1 Method for drilling deviated wellbores |
| 08/04/1988 | DE3702144A1 Percussion drilling unit for rotary percussion drilling in minerals, rocks and ores |
| 08/03/1988 | CN88200317U Oil extraction technological device with hallow rod |
| 08/02/1988 | US4760889 High bending strength ratio drill string components |
| 08/02/1988 | US4760887 Drill element for percussion drilling |
| 08/02/1988 | US4760884 Air chamber actuated dual tubing release assembly |
| 07/28/1988 | DE3700793A1 Rod protector for drill rods, in particular for deep-well drilling rigs |
| 07/26/1988 | US4759738 Floating cushion sub |
| 07/26/1988 | US4759601 Fiber optic connector assembly |
| 07/26/1988 | US4759571 Fluid transfer module with multiple flow paths |
| 07/26/1988 | US4759413 Method and apparatus for setting an underwater drilling system |
| 07/26/1988 | US4759407 Inverted working barrel and seat and method of manufacturing the same |
| 07/26/1988 | US4759406 Wireline tool connector with wellbore fluid shutoff valve |
| 07/26/1988 | US4759389 Synthetic resin pipe for underground installation |
| 07/20/1988 | EP0274933A1 Assembly for an electrical connection through a conduit formed by several elements, method for its installation in the interior of this conduit |
| 07/20/1988 | EP0274883A1 Pipeline joint |
| 07/20/1988 | EP0274719A2 Thread-forming method and tubular body provided with a thread |
| 07/20/1988 | EP0131622B1 Tubular coupling with improved metal to metal seal |
| 07/19/1988 | US4758025 Use of electroless metal coating to prevent galling of threaded tubular joints |
| 07/19/1988 | US4757873 For logging open and cased wells in the oil and gas industry |
| 07/19/1988 | US4757861 Oil well sucker rod coupling assembly |
| 07/19/1988 | US4757859 Apparatus for monitoring a parameter in a well |
| 07/14/1988 | DE3700644A1 Discharge pipes with interior plastic seal |
| 07/13/1988 | EP0274235A2 Stabilizer for a drilling string |
| 07/13/1988 | CN87211037U Telescopic seismic-transmitting unit |
| 07/12/1988 | US4756363 Apparatus for releasing a perforation gun |
| 07/12/1988 | CA1239089A1 Corrosion resistant metal pipe and process for producing same |
| 07/06/1988 | CN87214931U Quick fitting tool joint for spiral drill |
| 07/05/1988 | US4755805 Current sensing alarm arrangement for monitoring the presence of high voltage |
| 07/05/1988 | US4755240 Containing chromium, molybdenum, tungsten, aluminum, niobium, titanium, hafnium, cobalt, nickel, small amounts of carbon, oxygen, nitrogen |
| 07/05/1988 | US4754821 For use in an adjustable stabilizer |
| 07/05/1988 | US4754819 Method for improving cuttings transport during the rotary drilling of a wellbore |
| 07/05/1988 | CA1238849A1 Method and device enabling the taking of measurements and/or the undertaking of operations within a well |
| 06/30/1988 | DE3642387A1 Device for setting drill stems in rotational motion and for axially moving drill stems |
| 06/29/1988 | EP0273016A2 Threaded coupling for well casings |