| Patents for E21B 47 - Survey of boreholes or wells (31,352) |
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| 03/08/2000 | EP0984135A2 Formation pressure measurement with remote sensors in cased boreholes |
| 03/08/2000 | CN2367765Y Small-well-diameter automatic sidewall-contacting combined instrument |
| 03/07/2000 | US6032739 Method of locating wellbore casing collars using dual-purpose magnet |
| 03/07/2000 | US6032736 Multi-gage blowout preventer test tool and method |
| 03/02/2000 | WO2000011317A1 Method of using a heater with a fiber optic string in a wellbore |
| 03/02/2000 | WO2000011316A1 Surveying a subterranean borehole using accelerometers |
| 03/02/2000 | WO2000011303A1 Apparatus for directional drilling |
| 03/02/2000 | DE19837546A1 Meßvorrichtung zum Bestimmen der Ausrichtung und des Verlaufs eines Bohrgestänges A measuring device for determining the orientation of the gradient of a drill string and |
| 03/02/2000 | CA2342139A1 Method of using a heater with a fiber optic string in a wellbore |
| 02/29/2000 | US6029755 Conductive medium for openhole logging and logging while drilling |
| 02/29/2000 | US6029744 Method and apparatus for retrieving fluid samples during drill stem tests |
| 02/24/2000 | WO2000009855A1 Hydraulic well control system |
| 02/23/2000 | EP0980958A2 Measuring device for determining the alignment and the trajectory of a drill string |
| 02/23/2000 | CN1245244A Method for widening frequency band of well-logging cable |
| 02/23/2000 | CN1245243A Parameters design method for mechanically oil-producing technology with rod pump. |
| 02/23/2000 | CN1049719C Method for testing water-covering oil layer saturation degree by using normal boring sample-test reference |
| 02/23/2000 | CN1049718C Method and system for controlling vibrations in borehole equipment |
| 02/22/2000 | US6028992 Method for constituting a model representative of multiphase flows in oil production pipes |
| 02/22/2000 | US6028534 Formation data sensing with deployed remote sensors during well drilling |
| 02/22/2000 | US6028307 Data acquisition and reduction method for multi-component flow |
| 02/22/2000 | US6026914 Wellbore profiling system |
| 02/22/2000 | US6026913 Acoustic method of connecting boreholes for multi-lateral completion |
| 02/22/2000 | US6026911 Downhole tools using artificial intelligence based control |
| 02/22/2000 | US6026900 Multiple liner method for borehole access |
| 02/16/2000 | CN2364215Y Annular water-finding instrument flow concentrating device |
| 02/16/2000 | CN2364214Y Storage type downhole synchronous flow and pressure tester |
| 02/16/2000 | CN2364213Y Oil well zonal gas lift valve |
| 02/16/2000 | CN1244742A High electric resistance earthing system for oil welle lectric system |
| 02/15/2000 | US6024173 Inflatable shifting tool |
| 02/15/2000 | CA2165626C Rate gyro wells survey system including nulling system |
| 02/15/2000 | CA2084951C Method and apparatus for measuring pumping rod position and other aspects of a pumping system by use of an accelerometer |
| 02/13/2000 | CA2280283A1 An acoustic transmission system |
| 02/10/2000 | DE19927240A1 Erfassung von unterirdischen Objekten Detection of buried objects |
| 02/09/2000 | EP0978919A2 High resistance grounding system for oil well electrical system |
| 02/09/2000 | EP0977931A1 Multizone production monitoring system |
| 02/09/2000 | CN2363058Y Pressure leader for bottom hole survey of electric pump well |
| 02/09/2000 | CN2363057Y Electronic measuring vehicle |
| 02/08/2000 | US6023658 Noise detection and suppression system and method for wellbore telemetry |
| 02/08/2000 | US6023445 Determining contact levels of fluids in an oil reservoir using a reservoir contact monitoring tool |
| 02/08/2000 | US6023444 Method and device for the acquisition of signals while drilling |
| 02/08/2000 | US6021676 Instrument for measurement of basementrock's deformation |
| 02/08/2000 | US6021577 Borehole surveying |
| 02/03/2000 | WO2000005486A1 Automatic depth sensing detection for portable soil moisture probes |
| 02/03/2000 | WO1999059002A3 System and process for optimizing gravity gradiometer measurements |
| 02/03/2000 | WO1999058809A3 Coupling with shape-memory material, disconnecting tool with a piston and coupling with valves |
| 02/02/2000 | EP0975992A1 Pressure impulse telemetry apparatus and method |
| 02/02/2000 | EP0975851A1 Acoustic data link for downhole mwd system |
| 02/02/2000 | EP0862683B1 Method of qualifying a borehole survey |
| 02/02/2000 | CN2361834Y Storage depth measuring apparatus |
| 02/02/2000 | CN2361833Y Gamma-ray logging instrument with small diameter of phi 25mm |
| 02/02/2000 | CN2361832Y Separate liquid production profile and pressure synchronous self-controlling testing process tubular column for pumping well |
| 02/02/2000 | CN2361831Y Subdivision water injection hydraulic putting in or getting out differential pressure type flow tester |
| 02/01/2000 | US6021377 Drilling system utilizing downhole dysfunctions for determining corrective actions and simulating drilling conditions |
| 02/01/2000 | US6021095 Method and apparatus for remote control of wellbore end devices |
| 02/01/2000 | US6019182 Collar mounted downhole tool |
| 02/01/2000 | US6019181 Core drilling latch assembly |
| 01/27/2000 | WO2000004275A1 Downhole well corrosion monitoring apparatus and method |
| 01/26/2000 | EP0974066A1 High impact communication and control system |
| 01/26/2000 | EP0973997A1 Method and apparatus for the downhole compositional analysis of formation gases |
| 01/26/2000 | EP0973996A1 Downhole monitoring method and device |
| 01/26/2000 | EP0973992A1 Subsurface probe system for chemical and mineral exploration |
| 01/26/2000 | CN2360605Y Well electronic baresthesiometer |
| 01/26/2000 | CN2360604Y Anti-dropping rope cap for circular space detection |
| 01/25/2000 | US6018501 Subsea repeater and method for use of the same |
| 01/25/2000 | US6018496 Method and apparatus for hydraulic isolation determination |
| 01/25/2000 | US6018301 Disposable electromagnetic signal repeater |
| 01/20/2000 | WO2000003270A1 Borehole seismic tool |
| 01/20/2000 | WO2000003119A1 Combination side pocket mandrel flow measurement and control assembly |
| 01/20/2000 | WO1997037102A3 Downhole flow control devices |
| 01/19/2000 | EP0972909A2 Electromagnetic telemetry system |
| 01/18/2000 | US6016288 Servo-driven mud pulser |
| 01/18/2000 | US6016191 Apparatus and tool using tracers and singles point optical probes for measuring characteristics of fluid flow in a hydrocarbon well and methods of processing resulting signals |
| 01/18/2000 | CA2006935C Remote control device for equipment with needle valve system |
| 01/11/2000 | US6014026 Boring technique for using locate point measurements for boring tool depth prediction |
| 01/11/2000 | US6012537 Printed circuit board mounting for oil tools |
| 01/11/2000 | US6012527 Method and apparatus for drilling and re-entering multiple lateral branched in a well |
| 01/06/2000 | WO2000000845A1 Method and apparatus for quick determination of the ellipticity of an earth borehole |
| 01/06/2000 | WO2000000799A1 Non-intrusive fiber optic pressure sensor for measuring unsteady pressures within a pipe |
| 01/06/2000 | WO2000000786A1 Determining the shape and orientation of a borehole |
| 01/06/2000 | WO2000000716A2 System and method for controlling fluid flows in oil or gas wells |
| 01/06/2000 | CA2334965A1 System and method for controlling fluid flows in oil or gas wells |
| 01/05/2000 | DE19829535C1 Flexible, multicomponent downhole measurement device |
| 01/05/2000 | CN2357131Y Petroleum logging electrode bridle |
| 01/04/2000 | US6012015 Control model for production wells |
| 01/04/2000 | US6009811 Charge assembly for a pipe-coupling cutting device |
| 01/04/2000 | CA2190749C Vortex chamber mud pulser |
| 12/30/1999 | DE19824503C1 Method of comparative measurement of pilot tube drive direction towards target for laying pipe connections |
| 12/29/1999 | CN2356143Y Effective stroke test instrument for pumping well |
| 12/28/1999 | US6009216 Coiled tubing sensor system for delivery of distributed multiplexed sensors |
| 12/28/1999 | US6008651 Orientation sensor arrangement and method for use in a system for monitoring the orientation of an underground boring tool |
| 12/28/1999 | US6006844 Method and apparatus for simultaneous coring and formation evaluation |
| 12/28/1999 | US6006832 Method and system for monitoring and controlling production and injection wells having permanent downhole formation evaluation sensors |
| 12/28/1999 | US6006828 Apparatus for the remote deployment of valves |
| 12/28/1999 | CA2000665C Process and apparatus for logging of non eruptive producing well |
| 12/23/1999 | WO1999066173A1 Method of determining azimuth of a borehole |
| 12/23/1999 | WO1999066172A1 Method and system for measuring data in a fluid transportation conduit |
| 12/22/1999 | EP0819205B1 A surface controlled wellbore directional steering tool |
| 12/22/1999 | EP0807202A4 Method of monitoring fluids entering a wellbore |
| 12/22/1999 | CN2355102Y Simulator for signals of drilling recorder |
| 12/21/1999 | US6005532 Orthogonal antenna arrangement and method |