| Patents for E21B 47 - Survey of boreholes or wells (31,352) |
|---|
| 07/30/1997 | EP0786658A1 Device for measuring the permeability of rock fragments |
| 07/30/1997 | EP0786043A1 Solenoid guide system for horizontal boreholes |
| 07/29/1997 | US5652617 Side scan down hole video tool having two camera |
| 07/26/1997 | CA2195896A1 Downhole production well instrumentation |
| 07/26/1997 | CA2195723A1 Apparatus and method for the suppression of microphonic noise in proportional counters for borehole logging-while-drilling |
| 07/25/1997 | CA2497637A1 Device and sample holder disk for measuring the permeability of rock fragments |
| 07/24/1997 | WO1997026442A1 Method for measuring of flow and flowmeter |
| 07/24/1997 | WO1997015749A3 Closed loop drilling system |
| 07/24/1997 | DE19600592A1 Drill detecting subterranean explosive devices e.g. buried mines |
| 07/18/1997 | CA2194527A1 Method and apparatus for analyzing physical properties of materials |
| 07/17/1997 | WO1997025683A1 Method for conducting moving or rolling check shot for correcting borehole azimuth surveys |
| 07/17/1997 | WO1997025519A1 Trenchless underground boring system with boring tool location |
| 07/17/1997 | WO1997025517A1 Flow meter |
| 07/17/1997 | CA2241808A1 Trenchless underground boring system with boring tool location |
| 07/15/1997 | US5648555 Unsaturated ethers with adamantane groups for detectable compounds by fluorescence |
| 07/15/1997 | US5647435 Containment of downhole electronic systems |
| 07/10/1997 | WO1997024615A1 Automatic well test system and method of operating the same |
| 07/08/1997 | US5646611 System and method for indirectly determining inclination at the bit |
| 06/25/1997 | EP0780702A1 Method and device for signal capture while drilling |
| 06/24/1997 | US5642051 Method and apparatus for surveying and monitoring a reservoir penetrated by a well including fixing electrodes hydraulically isolated within a well |
| 06/18/1997 | EP0779409A1 Traceable well cement composition and its use |
| 06/18/1997 | EP0622524B1 System for measuring excavation position of underground excavator |
| 06/17/1997 | US5639380 System for automating groundwater recovery controlled by monitoring parameters in monitoring wells |
| 06/15/1997 | CA2192890A1 Traceable well cement compositions and methods |
| 06/14/1997 | CA2192154A1 Regenerative hydraulic power transmission for down-hole pump |
| 06/12/1997 | WO1997021117A1 Composite material structures having reduced signal attenuation |
| 06/12/1997 | WO1997021116A1 Use of acoustic emission in rock formation analysis |
| 06/12/1997 | WO1997021077A1 Differential pressure measurement systems for fluid streams |
| 06/12/1997 | CA2242103A1 Differential pressure measurement systems for fluid streams |
| 06/12/1997 | CA2237432A1 Composite material structures having reduced signal attenuation |
| 06/11/1997 | EP0778473A2 Transducer for sonic logging-while-drilling |
| 06/11/1997 | CN2256035Y Electric cable terminals for production logging |
| 06/11/1997 | CN1151783A Logging or measurement while tripping |
| 06/10/1997 | US5637747 Synthesis of 1,2-dioxetanes and intermediates therefor |
| 06/10/1997 | US5636686 Measuring assembly comprising means for orienting a part of the measuring elements |
| 06/03/1997 | US5636178 Fluid driven siren pressure pulse generator for MWD and flow measurement systems |
| 06/03/1997 | US5635712 Method for monitoring the hydraulic fracturing of a subterranean formation |
| 06/03/1997 | US5635710 For in-situ/ground water contaminants |
| 06/03/1997 | US5635636 Method of determining inflow rates from underbalanced wells |
| 06/03/1997 | US5634522 Liquid level detection for artificial lift system control |
| 05/29/1997 | WO1997019250A1 Method of qualifying a borehole survey |
| 05/29/1997 | WO1997014933A3 Electronic compass |
| 05/27/1997 | US5633589 Device and method for locating an inground object and a housing forming part of said device |
| 05/21/1997 | EP0774565A2 Downhole arrangement for acquiring well information |
| 05/20/1997 | US5631563 Resistivity antenna shield, wear band and stabilizer assembly for measuring-while-drilling tool |
| 05/20/1997 | US5631413 Fluid holdup tool and flow meter for deviated wells |
| 05/14/1997 | EP0773345A1 A method of recovering data acquired and stored down a well, by an acoustic path, and apparatus for implementing the method |
| 05/14/1997 | EP0773344A1 Device for exploring a downhole formation traversed by a horizontal borehole with several anchorable probes |
| 05/14/1997 | CN2254121Y Mine strings sensor |
| 05/13/1997 | US5629480 To measure rock deformation caused by rock failure under tension |
| 05/13/1997 | US5628366 Protective arrangements for downhole tools |
| 05/13/1997 | US5628364 Comprising an air pump to draw subterranean gases and moisture through shaft as needed in response to detection of bioremediation fluid depth; noncontamination of water table |
| 05/13/1997 | CA2155080C Downhole memory gauge protection system |
| 05/09/1997 | WO1997016751A1 Downhole power and communication system |
| 05/09/1997 | WO1997016624A1 Producing well artificial lift system control |
| 05/07/1997 | CN1149100A Method for finding remaining oil by boron and neutron life well-logging instrument |
| 05/06/1997 | US5627749 Corrosion monitoring tool |
| 05/06/1997 | US5626192 Coiled tubing joint locator and methods |
| 05/01/1997 | WO1997015749A2 Closed loop drilling system |
| 04/29/1997 | US5624182 Automatic cementing system with improved density control |
| 04/24/1997 | WO1997014933A2 Electronic compass |
| 04/24/1997 | WO1997014869A1 Method and apparatus for improved communication in a wellbore utilizing acoustic signals |
| 04/23/1997 | EP0769606A1 Exploration device for a subterranean formation traversed by a horizontal well comprising a plurality of sensors |
| 04/23/1997 | CN1148132A Dynamic method for monitoring the advanced direction of injected water into water injection well |
| 04/22/1997 | US5623407 Method of correcting axial and transverse error components in magnetometer readings during wellbore survey operations |
| 04/22/1997 | US5623108 Method and system for measuring three-dimensional displacement |
| 04/16/1997 | EP0767863A1 Downhole data transmission |
| 04/16/1997 | EP0767862A1 Well completion lubricator valve |
| 04/16/1997 | CN2252331Y Single-well crude oil automatic control monitoring instrument |
| 04/16/1997 | CN2252237Y Drillhole bore-size surveying meter |
| 04/16/1997 | CN2252236Y Underground instrument protecting jacket |
| 04/15/1997 | US5621325 Avoiding ghosting artifacts during surface location of subsurface transmitters |
| 04/15/1997 | US5621169 Method for determining hydrocarbon/water contact level for oil and gas wells |
| 04/15/1997 | US5620051 Whipstock |
| 04/10/1997 | DE19537149A1 Verfahren und Meßgerät zum Messen des hydrostatischen Drucks, insbesondere des Grundwassers The method and measuring device for measuring of the hydrostatic pressure, in particular of ground water |
| 04/09/1997 | EP0766775A1 Logging or measurement while tripping |
| 04/09/1997 | EP0680544B1 Method for determining changes in well bore morphology |
| 04/09/1997 | EP0679216B1 Method for determining borehole direction |
| 04/08/1997 | US5617926 Steerable drilling tool and system |
| 04/05/1997 | CA2187061A1 Pressure signalling for fluidic media |
| 04/03/1997 | WO1997012113A1 Method and apparatus for selective horizontal well re-entry using retrievable diverter oriented by logging means |
| 04/03/1997 | WO1997012112A1 Method for isolating multi-lateral well completions while maintaining selective drainhole re-entry access |
| 04/02/1997 | EP0623223B1 Method and apparatus for acoustic shear wave logging |
| 04/01/1997 | US5615739 Apparatus and method for completing and recompleting wells for production |
| 03/30/1997 | CA2186770A1 Apparatus for measuring pressure |
| 03/26/1997 | EP0764375A1 Vortex chamber mud pulser |
| 03/26/1997 | CN2250422Y Piezoelectric gyroscope inclinometer for drill |
| 03/25/1997 | US5615172 For use in a borehole |
| 03/25/1997 | US5615115 Method of determining pore pressure and fracture gradient profiles using seismic transit times |
| 03/25/1997 | US5613561 Apparatus for sealing instruments in a downhole tool |
| 03/20/1997 | WO1997010413A1 Borehole surveying |
| 03/19/1997 | EP0763647A2 Steerable drilling tool and system |
| 03/19/1997 | EP0737322A4 Method and apparatus for communicating signals from encased borehole |
| 03/19/1997 | CN2249825Y Metering instrument for oil logging vehicles |
| 03/19/1997 | CN2249824Y Bidirectional instrument suspender |
| 03/19/1997 | CN1145446A Compliance-based torque and drag monitoring system and method |
| 03/18/1997 | US5611642 Remediation apparatus and method for organic contamination in soil and groundwater |
| 03/12/1997 | EP0760942A1 Apparatus for testing a shear thickening plugging fluid |
| 03/12/1997 | CA2185067A1 Production wells having permanent downhole formation evaluation sensors |
| 03/11/1997 | US5610331 Thermal imager for fluids in a wellbore |