| Patents for E21B 47 - Survey of boreholes or wells (31,352) |
|---|
| 03/06/1997 | WO1997008459A1 An improved electrical submersible pump and methods for enhanced utilization of electrical submersible pumps in the completion and production of wellbores |
| 03/06/1997 | WO1997008429A1 Method and apparatus for measuring position and attitude of tunnel boring machine |
| 03/06/1997 | WO1997008424A1 Downhole tool system |
| 03/06/1997 | DE19532493A1 Determining depth of blanket mirror in salt cavern |
| 03/05/1997 | EP0760419A2 Method for surveying planned tunnel galleries |
| 03/05/1997 | CN2248779Y Hydraulic type dynamic instrument for oil obtg. well |
| 03/04/1997 | US5608323 Arrangement of the electrodes for an electrical logging system for determining the electrical resistivity of a subsurface formation |
| 03/04/1997 | US5607015 Method and apparatus for installing acoustic sensors in a wellbore |
| 02/27/1997 | WO1997007415A1 Method for representing the path of one or more boreholes in a spatial and temporal domain |
| 02/27/1997 | WO1996041931A3 Subsurface signal transmitting apparatus |
| 02/26/1997 | EP0759498A2 Arrangement of an impact sensitive apparatus in a housing |
| 02/25/1997 | US5606124 Apparatus and method for determining the gravitational orientation of a well logging instrument |
| 02/25/1997 | US5605192 Means and method to displace a logging tool to the bottom of a well for withdrawal through the well |
| 02/20/1997 | DE19530060A1 Water extraction system for narrow boreholes with diameter from 22 mm and depths greater than 10 m |
| 02/19/1997 | EP0670951B1 Method for detecting relative position of bores |
| 02/18/1997 | US5604582 Methods and apparatus for taking spectroscopic measurements of sediment layers beneath a body of water |
| 02/18/1997 | US5603282 Utility pipe displacement sensor |
| 02/12/1997 | EP0757746A1 Method for measuring formation fluids in drilling fluid |
| 02/12/1997 | CN1142568A Supersonic inspecting system of oil well cementation quality |
| 02/11/1997 | US5602541 System for drilling deviated boreholes |
| 02/11/1997 | US5601148 Arrangement for measuring the position of a feed beam in a rock drilling apparatus and/or measuring the position of a rock drill |
| 02/06/1997 | WO1996027732A3 Shifting tool, releasing mechanism, position feedback method and method of releasing |
| 02/05/1997 | CN2246709Y Portable function diagram and liquid measuring instrument for well pumping unit |
| 02/05/1997 | CN2246708Y Multi-drum hydraulic well testing truck |
| 02/04/1997 | CA2168651C Improved slick line system with real-time surface display |
| 01/29/1997 | EP0756066A2 Apparatus for housing and sealing of instruments in a downhole tool |
| 01/29/1997 | CN2246192Y Exploring tube body connected by T-shape head slot |
| 01/29/1997 | CN1141384A Mechanism for preventing loosing of oil-pumping rod and oil-pump plunger screw |
| 01/28/1997 | US5597042 Method for controlling production wells having permanent downhole formation evaluation sensors |
| 01/28/1997 | CA2040281C Wireline supported perforating gun enabling oriented perforations |
| 01/22/1997 | EP0541773B1 Method and apparatus for determining path orientation of a passageway |
| 01/22/1997 | CN2245663Y Underground instrument locating device |
| 01/21/1997 | US5596142 Well logging apparatus comprising a measuring pad and a combinaton device including such apparatus |
| 01/21/1997 | US5595245 Systems of injecting phenolic resin activator during subsurface fracture stimulation for enhanced oil recovery |
| 01/15/1997 | EP0753647A2 Down hole testing apparatus with television |
| 01/15/1997 | EP0753161A1 Acoustic sensor |
| 01/15/1997 | CN2245116Y Well head device for tubing-casing annulus depth finder |
| 01/14/1997 | US5594344 Method and apparatus for generating and detecting amplitude and phase modulated sensor signals |
| 01/14/1997 | CA2094479C Monitoring and pump-off control with downhole pump cards |
| 01/10/1997 | WO1997013124A1 Method and measuring device for measuring hydrostatic pressure, in particular that of ground water |
| 01/07/1997 | US5592438 Method and apparatus for communicating data in a wellbore and for detecting the influx of gas |
| 01/07/1997 | US5592381 Device for processing and interpreting drilling data, placed at the bottom of a well and method implementing this device |
| 01/07/1997 | US5590958 Automatic cementing system for precisely obtaining a desired cement density |
| 01/07/1997 | US5590714 To protect instrumentation placed in a drill string in a well |
| 12/31/1996 | US5589825 Logging or measurement while tripping |
| 12/31/1996 | US5589775 Rotating magnet for distance and direction measurements from a first borehole to a second borehole |
| 12/31/1996 | US5589633 Method and apparatus for measuring pumping rod position and other aspects of a pumping system by use of an accelerometer |
| 12/31/1996 | CA2035974C Cased hole formation tester |
| 12/27/1996 | WO1996041931A2 Subsurface signal transmitting apparatus |
| 12/25/1996 | CN2243535Y Pulling magnetic blocked portion tester |
| 12/25/1996 | CN2243534Y Oil well underground fracturing data collecting apparatus |
| 12/25/1996 | CN2243533Y Twist preventing device for oil-well circular space testing |
| 12/25/1996 | CN1138887A Method of creating a borehole in an earth formation |
| 12/24/1996 | US5586608 Method of making an anti-bit balling well fluid using a polyol having a cloud point, and method of drilling |
| 12/19/1996 | WO1996041066A1 Logging system combining video camera and sensors for environmental downhole conditions |
| 12/19/1996 | WO1996040836A1 Method of making an anti-bit balling well fluid using a polyol having a cloud point, and method of drilling |
| 12/19/1996 | CA2222536A1 Method of making an anti-bit balling well fluid using a polyol having a cloud point, and method of drilling |
| 12/18/1996 | EP0749004A1 A venturi flow meter for measurement in a fluid flow passage |
| 12/18/1996 | CN2242977Y Multi-parameter wheel-drilling liquid performance sensor |
| 12/18/1996 | CN1138133A Magnetic controlled liquid level interface instrument |
| 12/17/1996 | US5586084 Mud operated pulser |
| 12/17/1996 | US5586083 Turbo siren signal generator for measurement while drilling systems |
| 12/17/1996 | US5585726 Electronic guidance system and method for locating a discrete in-ground boring device |
| 12/17/1996 | US5585556 Method and apparatus for performing measurements while drilling for oil and gas |
| 12/17/1996 | US5585555 Borehole strainmeter |
| 12/11/1996 | EP0747571A2 Downhole pressure pulse generator |
| 12/11/1996 | EP0747570A1 Mid pulse valve for measurement-while-drilling system |
| 12/11/1996 | EP0747569A2 Down-hole tool and method for providing images of earth formations on a microscopic scale |
| 12/11/1996 | EP0746664A1 Whipstock apparatus and methods of use |
| 12/11/1996 | CN1033541C System and method for data processing |
| 12/10/1996 | US5583827 Measurement-while-drilling system and method |
| 12/10/1996 | US5582248 Reversal-resistant apparatus for tool orientation in a borehole |
| 12/10/1996 | US5582064 Remotely deployable pressure sensor |
| 12/04/1996 | CN2241773Y Load and motion two-parameter transducer |
| 12/03/1996 | USRE35386 Method for drilling directional wells |
| 12/03/1996 | US5579842 Bottomhole data acquisition system for fracture/packing mechanisms |
| 11/28/1996 | WO1996037678A1 Locating a discrete in-ground boring device |
| 11/28/1996 | WO1996024752A3 Method and appartus for remote control of wellbore end devices |
| 11/27/1996 | EP0744527A1 Method and apparatus for the transmission of information to a downhole receiver. |
| 11/27/1996 | EP0744526A1 Method for controlling a drilling tool |
| 11/27/1996 | CN1136636A Induced polarization and natural potential combined well logging instrument aud interpretation method |
| 11/26/1996 | US5579283 Method and apparatus for communicating coded messages in a wellbore |
| 11/26/1996 | US5577559 High-rate multizone gravel pack system |
| 11/21/1996 | DE19611879A1 Bandpaßfilter für Vorverstärker Bandpass filter for preamplifier |
| 11/19/1996 | US5576703 Method and apparatus for communicating signals from within an encased borehole |
| 11/19/1996 | US5576485 Single fracture method and apparatus for simultaneous measurement of in-situ earthen stress state and material properties |
| 11/16/1996 | CA2175940A1 Control system with collection chamber |
| 11/14/1996 | WO1996035859A1 A process for directional drilling |
| 11/12/1996 | US5574263 Production logging mechanism for across-the-borehole measurement |
| 11/12/1996 | US5574218 Determining the length and azimuth of fractures in earth formations |
| 11/09/1996 | CA2175963A1 Method of determining the quality of steam for stimulating hydrocarbon production |
| 11/06/1996 | EP0741230A2 Method of detecting the location of well treating fluid |
| 11/06/1996 | EP0638163B1 Remotely deployable pressure sensor |
| 11/05/1996 | US5572318 Lead pipe configuration for underground pipe laying |
| 11/05/1996 | US5572021 Methods of detecting the locations of well treating fluids |
| 11/05/1996 | US5571962 Method for determining wellbore depth of drill cuttings |
| 10/31/1996 | DE19608932A1 System for measuring load-deformation characteristics of loose stone and landfill |
| 10/29/1996 | US5570437 Apparatus for the remote measurement of physical parameters |
| 10/29/1996 | US5568838 Of a subterranean formation |
| 10/23/1996 | EP0738366A1 Method of creating a borehole in an earth formation |