| Patents for E21B 47 - Survey of boreholes or wells (31,352) |
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| 12/08/1994 | WO1994028450A1 Reduced diameter down-hole instrument cable |
| 12/08/1994 | WO1994028440A1 System and method of protecting optical elements from down-hole fluids |
| 12/08/1994 | WO1994028280A1 Method of drilling multiple radial wells using multiple string downhole orientation |
| 12/06/1994 | US5370545 Process and device for the electrical interconnecting of equipments such as well tools |
| 12/06/1994 | US5370188 Borehole assembly, method and composition therefor |
| 12/06/1994 | CA2063216C Retrievable radiation source carrier |
| 12/06/1994 | CA1333412C Method of magnetizing well tubulars |
| 11/30/1994 | EP0431136B1 Dynamometric measuring device for drill pipe |
| 11/30/1994 | CN2184083Y Dropping against device of wellhead for sealed well logging |
| 11/29/1994 | US5367911 Device for sensing fluid behavior |
| 11/29/1994 | CA2042649C Ultrasonic measurement apparatus and method |
| 11/22/1994 | US5366017 Intermediate casing annulus monitor |
| 11/22/1994 | US5365769 Method for verifying the correct operation of a safety valve of an oil well |
| 11/22/1994 | US5365674 Device for measuring the displacement of a swivel of a drilling mast |
| 11/17/1994 | EP0624706A2 Directional drilling system with integrated formation evaluation logging tool |
| 11/15/1994 | US5365229 Adaptive telemetry system for hostile environment well logging |
| 11/15/1994 | US5363926 Device for detecting inclination of boring head of boring tool |
| 11/13/1994 | CA2123273A1 Steerable motor system with integrated formation evaluation logging capacity |
| 11/10/1994 | WO1994025732A1 A method of determining the production rate of each of the phases in a well stream |
| 11/09/1994 | EP0623223A1 Method and apparatus for acoustic shear wave logging. |
| 11/08/1994 | US5363299 Method for identifying faults and unconformities in a geologic formation |
| 11/08/1994 | US5363095 Communicating drilling information to the surface during drilling operations |
| 11/08/1994 | US5363094 Stationary system for the active and/or passive monitoring of an underground deposit |
| 11/08/1994 | US5362206 Pump control responsive to voltage-current phase angle |
| 11/08/1994 | US5361854 Laser positioning system for earth boring apparatus |
| 11/08/1994 | US5361838 Slick line casing and tubing joint locator apparatus and associated methods |
| 11/08/1994 | US5361632 Method and apparatus for determining multiphase holdup fractions using a gradiomanometer and a densitometer |
| 11/02/1994 | EP0622524A1 System for measuring excavation position of underground excavator |
| 11/02/1994 | CN2181565Y Microelectrode powered calliper logging device |
| 11/02/1994 | CN2181564Y Mechanical lift type polish rod hanging load transducer for oil well |
| 11/01/1994 | US5361206 Method of analyzing a two-phase flow in a hydrocarbon well |
| 11/01/1994 | US5360066 Method for controlling sand production of formations and for optimizing hydraulic fracturing through perforation orientation |
| 11/01/1994 | CA1332832C Moling system |
| 10/26/1994 | EP0621397A1 Method of and apparatus for detecting an influx into a well while drilling |
| 10/26/1994 | CN2180780Y Suspension digital controlling well-measuring cable mark making device |
| 10/25/1994 | US5359195 Gas hold up tool for use in cased well boreholes |
| 10/25/1994 | US5358059 Apparatus and method for the dynamic measurement of a drill string employed in drilling |
| 10/25/1994 | US5357806 Capacitive differential pressure sensor and method of measuring differential pressure at an oil or gas well |
| 10/25/1994 | US5357797 Method and apparatus for correcting MWD porosity measurement |
| 10/19/1994 | CN1093772A Universal intelligent diagnostic instrument for deepwell pump oil-production well condition |
| 10/18/1994 | US5357483 Downhole tool |
| 10/18/1994 | US5357482 Well inspection method |
| 10/18/1994 | US5355951 Method of evaluating oil or gas well fluid process |
| 10/18/1994 | CA2011139C Downhole tool, including shock absorber |
| 10/13/1994 | WO1994023538A1 Instrument probe having a back-lighted camera |
| 10/13/1994 | WO1994023203A1 Bypass flowmeter for measuring hydraulic characteristics of pumping installations |
| 10/13/1994 | WO1994023180A1 Method and apparatus for determining depth of drill cuttings |
| 10/13/1994 | CA2136974A1 Method and apparatus for determining depth of drill cuttings |
| 10/12/1994 | EP0454771B1 Method for reducing noise in drill string signals |
| 10/11/1994 | US5355128 Video logging system having an optical communications link |
| 10/11/1994 | US5354956 Ultrasonic measurement apparatus |
| 10/11/1994 | US5353873 Apparatus for determining mechanical integrity of wells |
| 10/11/1994 | US5353872 System, support for carrying out measurings and/or servicings in a wellbore or in a well in the process of being drilled and uses thereof |
| 10/11/1994 | CA1332471C Method for measurement of azimuth of a borehole while drilling |
| 10/05/1994 | EP0618347A2 Cement placement in well |
| 10/04/1994 | US5351755 Method and apparatus for establish the orientation of tools in a cased borehole |
| 10/04/1994 | US5351534 Method and device for production logging in a gushing well |
| 10/04/1994 | US5351533 Coiled tubing system used for the evaluation of stimulation candidate wells |
| 10/04/1994 | US5351532 Methods and apparatus for making chemical concentration measurements in a sub-surface exploration probe |
| 10/04/1994 | US5351531 Depth measurement of slickline |
| 10/01/1994 | CA2120109A1 Detecting system and method for oil or gas well |
| 09/29/1994 | DE4409820A1 Determining the state of filling of a rod pump from the motor output |
| 09/28/1994 | EP0617196A2 Digital mud pulse telemetry system |
| 09/27/1994 | US5350018 Well treating system with pressure readout at surface and method |
| 09/24/1994 | CA2119905A1 Detection of rod pump fillage from motor power |
| 09/21/1994 | EP0616109A1 Method of evaluating oil or gas well cementing process |
| 09/21/1994 | EP0615573A1 Method and apparatus for determining the orientation of the axis of a borehole. |
| 09/21/1994 | CN2177803Y Automatic digital recorder for pressure at micro-borehole |
| 09/21/1994 | CN1025969C Mechanical protector for horizontal well measuring instrument |
| 09/20/1994 | US5348097 Device for carrying out measuring and servicing operations in a well bore, comprising tubing having a rod centered therein, process for assembling the device and use of the device in an oil well |
| 09/20/1994 | US5348091 Self-adjusting centralizer |
| 09/20/1994 | US5348084 Device for carrying out measuring and servicing operations in a well bore and use in an oil well |
| 09/20/1994 | US5347859 Dynamometric measuring device for a drill pipe |
| 09/07/1994 | EP0614034A1 Hose having means for the visual early detection of a malfunction and its end flanges |
| 09/06/1994 | US5343963 Method and apparatus for providing controlled force transference to a wellbore tool |
| 09/06/1994 | US5343953 Through-tubing recirculating tool assembly for well completions |
| 09/04/1994 | CA2116811A1 Flexible pipe comprising means for the early visual detection of defects, and end attachments |
| 09/01/1994 | WO1994019579A1 Method and apparatus for detecting impending sticking of a drillstring |
| 08/31/1994 | CN2175827Y Logging device for meauring well-pressure |
| 08/31/1994 | CN2175826Y Well-depth measuring device with digital intelligent winch panel |
| 08/31/1994 | CN2175825Y Sonic water gauge |
| 08/30/1994 | US5343440 Geopressure analysis system |
| 08/30/1994 | US5343152 Electromagnetic homing system using MWD and current having a funamental wave component and an even harmonic wave component being injected at a target well |
| 08/30/1994 | US5341886 System for controlled drilling of boreholes along planned profile |
| 08/27/1994 | CA2112777A1 Calibration correction method for magnetic survey tools |
| 08/23/1994 | US5341345 Ultrasonic stand-off gauge |
| 08/17/1994 | CN2174561Y Self-regulating flow-spliting and collecting type water-search instrument |
| 08/16/1994 | US5337821 Method and apparatus for the determination of formation fluid flow rates and reservoir deliverability |
| 08/16/1994 | US5337601 Method and apparatus for measuring pressure in a sealed well using a differential transducer |
| 08/10/1994 | CN2173862Y Well head assembly for sound-bomb measuring well liquid level depth |
| 08/10/1994 | CA2089105A1 Borehole laser cavity monitoring system |
| 08/09/1994 | US5337234 Self-contained downhole gauge system |
| 08/09/1994 | US5337002 Locator device for continuously locating a dipole magnetic field transmitter and its method of operation |
| 08/09/1994 | US5335724 Directionally oriented slotting method |
| 08/09/1994 | CA2051845C Determination of well pumping system downtime |
| 08/04/1994 | WO1994017281A1 Method for determining changes in well bore morphology |
| 08/04/1994 | WO1994017278A1 Means and method to displace a logging tool to the bottom of a well for withdrawal through the well |
| 08/04/1994 | DE4302469A1 Ground opening orientation measuring appts. |
| 08/04/1994 | CA2154674A1 Method of determining changes in well bore morphology |
| 08/02/1994 | US5334801 Pipe system with electrical conductors |