| Patents for E21B 47 - Survey of boreholes or wells (31,352) |
|---|
| 12/08/1987 | US4711123 Bundle type downhole gauge carrier |
| 12/08/1987 | US4711122 Flexible mud excluder for borehole televiewer |
| 12/08/1987 | CA1230173A1 Electronics packaging system |
| 12/08/1987 | CA1230049A1 Downhole mobility and propulsion apparatus |
| 12/05/1987 | CN86207607U Self-adjustable mechanical drill-attached inclinometer |
| 12/03/1987 | DE3617704A1 Method for transmitting data in drill pipes and arrangement for carrying out the method |
| 12/02/1987 | EP0247799A1 Method of and apparatus for providing an underground tunnel |
| 12/02/1987 | EP0247672A2 Method for determining the distance between adjacent wells |
| 12/01/1987 | US4710906 Method and system for monitoring the stability of boreholes |
| 12/01/1987 | US4710711 Apparatus for nondestructive testing of subsurface piping using three coils with opposing fields |
| 12/01/1987 | US4710708 Method and apparatus employing received independent magnetic field components of a transmitted alternating magnetic field for determining location |
| 12/01/1987 | US4709486 Method of determining the orientation of a surveying instrument in a borehole |
| 11/25/1987 | EP0246886A1 Method of and apparatus for locating a discrete inground boring device |
| 11/25/1987 | EP0246722A1 Apparatus for anchoring downhole corrosion coupons |
| 11/24/1987 | US4709357 Method and apparatus for acoustically investigating a borehole casing cement bond |
| 11/24/1987 | US4709234 For detecting an environmental condition in a well bore |
| 11/24/1987 | US4708212 Method and apparatus for optimizing determination of the originating depth of borehole cuttings |
| 11/24/1987 | US4708204 System for determining the free point of pipe stuck in a borehole |
| 11/19/1987 | EP0245971A2 Hydraulic drilling apparatus and method |
| 11/17/1987 | US4706388 Borehole initial alignment and change determination |
| 11/17/1987 | CA1229242A1 Drill stem testing apparatus with multiple pressure sensing ports |
| 11/10/1987 | US4704895 Method and device for monitoring roller drilling tools |
| 11/10/1987 | CA1229041A2 Multi-mode testing tool for use in a well bore |
| 11/10/1987 | CA1229040A2 Displacement valve for use in displacing fluid in a downhole tool |
| 11/10/1987 | CA1229039A2 Indexing assembly for a downhole tool |
| 11/10/1987 | CA1229038A2 Operating assembly for a downhole tool |
| 11/10/1987 | CA1229037A2 Ratchet assembly for transmitting movement in a downhole tool |
| 11/03/1987 | US4704579 Method of distinguishing material characteristics in a well bore for controlling photograph taking in the well bore |
| 11/03/1987 | CA1228910A1 Apparatus for producing geophysical measurements in a borehole |
| 11/03/1987 | CA1228909A1 Pressure pulse generator |
| 11/03/1987 | CA1228802A2 Operating assembly for a downhole tool |
| 11/03/1987 | CA1228801A2 Method of operating a multi-mode downhole tool |
| 11/03/1987 | CA1228800A1 Tool for use in a testing string disposed in a well bore |
| 10/28/1987 | CN86208888U Motor-pumped well (drill hole) sonic water-level meter |
| 10/27/1987 | US4703461 Universal mud pulse telemetry system |
| 10/27/1987 | US4703459 Directional acoustic logger apparatus and method |
| 10/27/1987 | US4703427 Method for evaluating the quality of cement surrounding the casing of a borehole |
| 10/27/1987 | EP0157766A4 Data encoding and synchronization for pulse telemetry. |
| 10/27/1987 | CA1228639A1 Method for the magnetization of well casing |
| 10/27/1987 | CA1228532A2 Method of operating a multi-mode downhole tool |
| 10/21/1987 | EP0242256A1 Process and device for measuring characteristics of geological formations in a horizontal borehole coming from an underground tunnel |
| 10/21/1987 | EP0242239A1 Tool for closing a well's production column |
| 10/20/1987 | US4701892 Downhole casing inspection system |
| 10/13/1987 | US4699352 Apparatus for well logging telemetry |
| 10/13/1987 | US4698911 Method of using a borehole televiewer dipmeter for determining true dip and azimuth |
| 10/13/1987 | CA1228137A1 Stuck point indicating device with linear sensing means |
| 10/13/1987 | CA1228018A1 Retrievable telemetry system |
| 10/06/1987 | US4698794 Device for remote transmission of information |
| 10/06/1987 | US4698631 Surface acoustic wave pipe identification system |
| 10/06/1987 | US4697650 Method for estimating formation characteristics of the exposed bottomhole formation |
| 09/30/1987 | EP0238601A1 Gauge carrier for incorporation into tubing for flow-testing of oil and gas exploration wells |
| 09/30/1987 | CN86101454A Fixed resistance well testing manometer |
| 09/29/1987 | US4696903 Method and apparatus for examining earth formations |
| 09/29/1987 | US4696112 Bore hole navigator |
| 09/29/1987 | CA1227537A1 Microwave electromagnetic borehole dipmeter |
| 09/29/1987 | CA1227417A1 Method and apparatus for oil well measurements |
| 09/24/1987 | DE3609588A1 Apparatus and method of determining the portion of gas, oil and water in crude-oil production |
| 09/22/1987 | US4694903 Flapper type annulus pressure responsive tubing tester valve |
| 09/22/1987 | US4694902 Procedure and device for determining the jamming point of a pipe line in a drill hole |
| 09/16/1987 | EP0236613A1 Detection of water flow outside a well casing |
| 09/16/1987 | CN85108157A Discharge logging device of oil-producing well |
| 09/15/1987 | US4694439 Well information telemetry by variation of mud flow rate |
| 09/15/1987 | US4694437 Subterranean surveying apparatus |
| 09/15/1987 | US4693327 Earth well drilling apparatus |
| 09/15/1987 | US4693317 For use in an earth borehole |
| 09/09/1987 | EP0236203A1 Method for positioning a sensor for detecting the location of an interface between two fluids and device for carrying out the method |
| 09/09/1987 | EP0235478A2 Borehole casing diagnostic apparatus |
| 09/08/1987 | US4692911 Methods and apparatus for reducing interfering effects in measurement while drilling operations |
| 09/08/1987 | US4692908 Method and apparatus for investigating stand-off in a borehole |
| 09/08/1987 | US4691772 Process for obtaining permeability logs using radioactive drilling mud additives |
| 09/08/1987 | CA1226513A1 Blanket-medium/brine interface detection in a solution-mining process |
| 09/02/1987 | EP0235032A2 Fluid meter, especially for hydrocarbon wells |
| 09/02/1987 | EP0234748A1 Homogenising and metering the flow of a multiphase mixture of fluids |
| 09/02/1987 | EP0234747A1 Measuring flow in a pipe |
| 09/02/1987 | EP0234731A1 Method of logging a well using a non-radioactive material irradiated into an isotope |
| 09/02/1987 | CN86206412U Pressure device for underweel jet pump |
| 09/01/1987 | US4691307 AGC circuit for televiewer |
| 09/01/1987 | US4691203 Drillstring signal transmitting system |
| 09/01/1987 | US4690218 Method for depth control and detonation of tubing conveyed gun assembly |
| 09/01/1987 | US4690216 Formation fluid sampler |
| 09/01/1987 | US4690214 Method and a device for carrying out measurements and/or operations in a well |
| 09/01/1987 | CA1226329A1 Microwave electromagnetic borehole dipmeter |
| 09/01/1987 | CA1226144A1 Foundation level and construction of a subsea production platform and a method of using said tool |
| 08/25/1987 | US4689775 Direct radiator system and methods for measuring during drilling operations |
| 08/25/1987 | US4689744 Control method for a recording device |
| 08/25/1987 | US4689620 Method and apparatus for data transmission between a transmission and a receiver disposed in a drill hole and a transmitter and a receiver disposed above ground |
| 08/25/1987 | US4688647 Drill bit having a failure indicator |
| 08/25/1987 | US4688638 Downhole corrosion coupon holder |
| 08/25/1987 | US4688635 Apparatus for setting a bottom tool |
| 08/20/1987 | DE3701189A1 Method and device for fitting seismic sensors in an oil production well |
| 08/20/1987 | DE3611374C1 Chain-shaped arrangement of several borehole probes |
| 08/19/1987 | EP0232891A2 Drilling tool for deep wells |
| 08/19/1987 | EP0232561A2 Borehole televiewer dipmeter |
| 08/19/1987 | CN86108023A Ring-drop testing method of oil-extracting well without shutdown |
| 08/18/1987 | US4687055 Wire-line controlled down-hole shut-in tool for wells |
| 08/18/1987 | US4686849 Method for determining mine roof competency |
| 08/13/1987 | WO1987004755A1 Method and apparatus for data transmission in a well using a flexible line with stiffener |
| 08/12/1987 | EP0231708A1 Apparatus and method for determining the orientation of fractures in a geological formation |
| 08/11/1987 | US4686658 For transmitting signals through a fluid |
| 08/11/1987 | US4686625 Method and apparatus for generating a display of well logging measurements |