| Patents for E21B 47 - Survey of boreholes or wells (31,352) |
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| 08/02/1994 | US5333686 Measuring while drilling system |
| 07/26/1994 | CA2032830C Coupling |
| 07/21/1994 | WO1994016196A1 Method for determining borehole direction |
| 07/20/1994 | EP0531336B1 Double-tube core drill for inclined drilling |
| 07/19/1994 | US5331578 Procedure for measuring angles and trajectories by means of gyros and inertial systems |
| 07/19/1994 | US5331318 Communications protocol for digital telemetry system |
| 07/19/1994 | US5331155 Methods of determining subterranean formation characteristics using computed tomographic images |
| 07/13/1994 | CN2171675Y Sound wave cement grouting well logging ground instrument |
| 07/12/1994 | US5327971 Pressure recorder carrier and method of use |
| 07/12/1994 | US5327773 Method and apparatus for measuring steam density by neutron method |
| 07/07/1994 | WO1994015068A1 Method of extracting crude oil from oil wells |
| 07/05/1994 | US5325714 Steerable motor system with integrated formation evaluation logging capacity |
| 06/29/1994 | EP0604156A1 Pressure signal for remote control of downhole tool |
| 06/29/1994 | CN2170372Y High-precise electronic pressure manometer |
| 06/29/1994 | CN2170368Y Monitor for direction of perforation gun |
| 06/28/1994 | US5323856 Detecting system and method for oil or gas well |
| 06/28/1994 | CA2002468C Method of determining the depth of a hydraulic fracture zone in the earth |
| 06/23/1994 | WO1994013931A1 Method for detecting relative position of bores |
| 06/23/1994 | DE4342381A1 Depth measuring device for well or borehole shaft of sewage system |
| 06/22/1994 | EP0602980A2 Method of perforating a well |
| 06/22/1994 | EP0438392B1 Apparatus and method for measuring borehole deviation |
| 06/22/1994 | CN2169687Y High precision parameter measurer for well depth, drilling time and suspension weight |
| 06/21/1994 | US5322391 Guided mole |
| 06/21/1994 | US5322126 System and method for monitoring fracture growth during hydraulic fracture treatment |
| 06/21/1994 | US5322119 Submersible well probe sleeve |
| 06/21/1994 | US5321981 Methods for analysis of drillstring vibration using torsionally induced frequency modulation |
| 06/21/1994 | US5321893 Calibration correction method for magnetic survey tools |
| 06/19/1994 | CA2111737A1 Remote programming of a downhole tool |
| 06/15/1994 | EP0601811A2 Measurement-while-drilling system using mud-pulse valve for data transmission |
| 06/15/1994 | EP0601046A1 Apparatus for transmitting instrumentation signals over power conductors |
| 06/15/1994 | CN1087967A Slurry parameter auto-testing device in use for oil and/or gas field well drilling and cementing |
| 06/14/1994 | US5320180 Dual antenna radio frequency locating apparatus and method |
| 06/14/1994 | US5320179 Steering sub for flexible drilling |
| 06/14/1994 | US5320169 Gauge carrier |
| 06/14/1994 | US5319959 Air lubricated penetrometer rod system |
| 06/14/1994 | CA2041960C Control apparatus and method responsive to a changing stimulus |
| 06/08/1994 | CN2168069Y Four parameter measuring device of water in well |
| 06/07/1994 | US5319610 Hydraulic acoustic wave generator system for drillstrings |
| 06/07/1994 | US5318129 Method and device for setting up sondes against the wall of a cased well |
| 06/07/1994 | US5318120 Well testing valve |
| 06/01/1994 | CN2167185Y Water-proof sealing structure for survey of well |
| 05/31/1994 | US5317111 Ultrasonic measurement apparatus |
| 05/31/1994 | US5316090 Attitude control device and drilling-direction control device |
| 05/31/1994 | US5316085 Method of recovering contaminated subterranean fluids from a wellbore |
| 05/25/1994 | EP0597898A1 Tubing test valve |
| 05/24/1994 | US5315110 For use in a wellbore to measure pressure |
| 05/24/1994 | US5314030 System for continuously guided drilling |
| 05/24/1994 | US5314016 Method for controlling rod-pumped wells |
| 05/24/1994 | US5313829 Method of determining drillstring bottom hole assembly vibrations |
| 05/24/1994 | CA2026869C System and method for monitoring drill bit depth |
| 05/18/1994 | EP0597704A1 Flow testing a well |
| 05/18/1994 | EP0597703A1 Downhole toolstring and testing apparatus |
| 05/17/1994 | US5312163 System for aiding operation of excavating type underground advancing machine |
| 05/17/1994 | US5311951 Method of maintaining a borehole in a stratigraphic zone during drilling |
| 05/17/1994 | CA1329495C System for monitoring fluids during well stimulation processes |
| 05/14/1994 | CA2102957A1 Acoustic system and method for flow testing a deep well |
| 05/11/1994 | WO1994010423A1 Modular, multi-level groundwater sampler |
| 05/11/1994 | EP0596165A1 Well based sensor for detecting the presence of liquid hydrocarbons on groundwater |
| 05/11/1994 | EP0433407B1 Moling system |
| 05/04/1994 | CN2163869Y Underground omnibearing wireless borehole slope-determining instrument |
| 05/04/1994 | CN2163868Y Working condition data collector for portable beam-pumping unit |
| 05/04/1994 | CN2163862Y Drilling depth indicator for submerged hole drills |
| 05/03/1994 | US5307885 Attitude and drilling-direction control device |
| 05/03/1994 | US5307681 Transient temperature compensation for pressure gauges using discrete temperature history measurements for gauge calibration |
| 04/28/1994 | WO1994009255A1 Pressure recorder carrier and method of use |
| 04/26/1994 | US5306980 Torsional force transducer and method of operation |
| 04/26/1994 | US5306911 Method for determining the flow rate of aqueous phases in a multiphase flow |
| 04/26/1994 | US5305649 Cable length and tension measuring device |
| 04/20/1994 | EP0500709B1 Pipe system with electrical conductors |
| 04/20/1994 | EP0466859B1 Pipework for constructing a ground water measuring point |
| 04/19/1994 | US5303773 Device for monitoring a deposit for a production well |
| 04/19/1994 | CA2029203C Steam process with foam for recovering viscous oils through horizontal wells |
| 04/19/1994 | CA1328693C Method of predicting and controlling the drilling trajectory in directional wells |
| 04/14/1994 | WO1994008127A1 Method for calculating sedimentary rock pore pressure |
| 04/13/1994 | CN2161722Y Isotope releasing device for survey of borehole or well |
| 04/13/1994 | CN2161721Y Polar Plate of thin microball focusing well measuring instrument |
| 04/13/1994 | CN2161720Y Testing instrument for determining vacuum insulating air-absorbing section |
| 04/12/1994 | US5303203 Method for reducing noise effects in acoustic signals transmitted along a pipe structure |
| 04/12/1994 | US5302879 Temperature/reference package, and method using the same for high pressure, high temperature oil or gas well |
| 04/12/1994 | US5302781 Sidewall contact temperature tool including knife edge sensors for cutting through mudcake and measuring formation temperature |
| 04/12/1994 | CA1328399C Process and means for measuring geological formations properties in a horizontal borehole drilled from an underground patch |
| 04/06/1994 | EP0590987A2 Determining orientation of a wellbore relative to formation stress fields |
| 04/06/1994 | CN1084936A Procedure and production pipe for production of oil or gas from an oil or gas reservoir |
| 04/05/1994 | US5300929 Method for delineating an anomalous geologic structure |
| 04/05/1994 | US5299359 Method and system for measurement of internal tube dimensions within a wellbore |
| 04/05/1994 | CA1328254C Drill pipes and casings utilizing multi-conduit tabulars |
| 03/31/1994 | WO1994007147A1 Single bore hole process and device allowing simultaneous videotechnical detection of groundwater direction and speed of flow |
| 03/31/1994 | WO1994006999A1 Arrangement for measuring the position of a feed beam in a rock drilling apparatus and/or measuring the position of a rock drill |
| 03/31/1994 | WO1994006997A1 Submersible well probe sleeve |
| 03/30/1994 | EP0588954A1 Apparatus for detecting boundary stratum |
| 03/29/1994 | US5298987 Method for investigating ground structure of pavement |
| 03/29/1994 | US5297641 Drilling deviation control tool |
| 03/29/1994 | US5297425 Electromagnetic borehole flowmeter system |
| 03/29/1994 | CA2105008A1 Casing hanger seal with test port |
| 03/29/1994 | CA2022195C Hydraulically operated permanent type well packer assembly |
| 03/23/1994 | EP0588421A1 Method and production pipe in an oil or gas reservoir |
| 03/23/1994 | EP0588401A2 Method of determining travel time in drillstring |
| 03/23/1994 | EP0588390A1 Transmitting data at different frequencies in a logging while drilling tool |
| 03/23/1994 | EP0588389A1 Logging-while-drilling tool |
| 03/23/1994 | EP0588373A1 Double-tube core taking apparatus for inclined drilling |