| Patents for E21B 47 - Survey of boreholes or wells (31,352) |
|---|
| 02/20/1996 | US5492017 Inductive pressure transducer |
| 02/08/1996 | DE19505855C1 Angled borehole measuring device |
| 02/07/1996 | EP0695853A2 Sensor protection from downhole fluids |
| 02/07/1996 | EP0695850A2 Steerable drilling tool and system |
| 02/07/1996 | CN1116440A Method for determining borehole direction |
| 02/06/1996 | US5490121 Nonlinear equalizer for measurement while drilling telemetry system |
| 02/06/1996 | US5488989 For use in forming a window at a wall of a well casing in a borehole |
| 02/06/1996 | CA2023351C Double guided mud pulse valve |
| 02/04/1996 | CA2129391A1 Depth measurement of slickline |
| 02/01/1996 | WO1996002734A1 Method for detecting pressure measurement discontinuities caused by fluid boundary changes |
| 02/01/1996 | WO1996002733A1 Method of correcting for error components in wellbore survey data |
| 01/23/1996 | US5486695 Standoff compensation for nuclear logging while drilling systems |
| 01/23/1996 | US5485745 Modular downhole inspection system for coiled tubing |
| 01/23/1996 | CA2128668A1 Method and apparatus for no touch tagging of cement plugs used in well abandonment |
| 01/18/1996 | WO1996001359A2 Logging or measurement while tripping |
| 01/17/1996 | EP0426820B1 Process and device for transmitting data signals and/or control signals in a pipe train |
| 01/17/1996 | CN1115001A Radioactive energy spectrum tracing water uptake section well logging method |
| 01/16/1996 | US5484029 Steerable drilling tool and system |
| 01/16/1996 | US5484022 For use in a drill string |
| 01/16/1996 | US5483987 Remote control method and device for actuating an equipment-application to a drill string |
| 01/11/1996 | WO1996000836A1 Downhole data transmission |
| 01/11/1996 | WO1996000835A1 Well completion lubricator valve |
| 01/11/1996 | CA2193648A1 Well completion lubricator valve |
| 01/10/1996 | CN2217101Y Volume senser for drilling fluid |
| 01/10/1996 | CN1114711A Method for distinguishing oil-water-layer by natural electric potential well logging |
| 01/09/1996 | US5482122 Oriented-radial-cores retrieval for measurements of directional properties |
| 01/03/1996 | CN2216589Y Connector for well head |
| 12/27/1995 | CN2216142Y Movable single-well three phase separated continuous measuring device |
| 12/27/1995 | CN1030583C High-accuracy gradiometer for drilling |
| 12/26/1995 | US5477921 Method and system for logging a well while fishing for the logging tool |
| 12/20/1995 | EP0516806B1 Device for remotely operating an assembly comprising a bean/needle system, and use thereof in a drill string |
| 12/19/1995 | US5477505 Downhole pipe selection for acoustic telemetry |
| 12/19/1995 | US5477101 Downhole acoustic transducer |
| 12/19/1995 | CA2007461C Whipstock starter mill with pressure drop tattletale |
| 12/15/1995 | CA2140694A1 Drilling a well with gas supply in the drilling liquid |
| 12/14/1995 | WO1995034144A1 Vortex chamber mud pulser |
| 12/13/1995 | CN2215022Y Multi-point photographic clinometer |
| 12/12/1995 | US5475309 Sensor in bit for measuring formation properties while drilling including a drilling fluid ejection nozzle for ejecting a uniform layer of fluid over the sensor |
| 12/12/1995 | US5474133 Method for retreiving a slotted face wellbore deviation assembly using a retrieval tool |
| 12/12/1995 | US5474125 Retrieval tool for use with a slotted face wellbore deviation assembly |
| 12/07/1995 | WO1995032817A1 Groundwater recovery systems |
| 12/06/1995 | EP0685628A1 Whipstock orientation method and system |
| 12/06/1995 | CN2214524Y Single dot photographing slope level |
| 12/05/1995 | US5473579 Well bore communication pulser |
| 12/05/1995 | US5473321 Method and apparatus to train telemetry system for optimal communications with downhole equipment |
| 12/05/1995 | US5473158 Logging while drilling method and apparatus for measuring formation characteristics as a function of angular position within a borehole |
| 12/03/1995 | CA2150786A1 Whipstock orientation method and system |
| 11/30/1995 | DE19514120A1 Borehole measuring probe |
| 11/29/1995 | EP0684363A1 Method and transmission system for a drill signal |
| 11/29/1995 | CN2213843Y Admeasuring apparatus for oil well liquid level pressure |
| 11/29/1995 | CN1112639A Drill bit central coordinate ultrasonic wave real-time measurement while drilling for large driller |
| 11/28/1995 | US5469916 System for depth measurement in a wellbore using composite coiled tubing |
| 11/28/1995 | US5469736 Apparatus and method for measuring a borehole |
| 11/22/1995 | EP0683304A2 Borehole logging tool |
| 11/22/1995 | CN2213231Y Well logging instrument delivery tool for big slope well |
| 11/21/1995 | US5469155 Wireless remote boring apparatus guidance system |
| 11/21/1995 | US5467832 Method for directionally drilling a borehole |
| 11/21/1995 | US5467823 Methods and apparatus for long term monitoring of reservoirs |
| 11/21/1995 | US5467821 Rectilinear tool for use with a slotted face wellbore deviation assembly |
| 11/21/1995 | US5467820 Slotted face wellbore deviation assembly |
| 11/16/1995 | WO1995023273A3 Whipstock apparatus and methods of use |
| 11/16/1995 | DE4438934C1 Location device for ram boring appts. |
| 11/14/1995 | US5467083 Wireless downhole electromagnetic data transmission system and method |
| 11/14/1995 | US5465799 System and method for precision downhole tool-face setting and survey measurement correction |
| 11/09/1995 | WO1995030160A1 Instant acoustic logging method for well bores |
| 11/09/1995 | CA2166216A1 Instant acoustic logging method for well bores |
| 11/08/1995 | EP0681090A2 Measurement while drilling tool |
| 11/08/1995 | EP0680601A1 Acoustic sand detector for fluid flowstreams |
| 11/08/1995 | EP0680544A1 Method for determining changes in well bore morphology. |
| 11/08/1995 | EP0564535B1 Determination of the relative position of measurement points |
| 11/08/1995 | CN2212074Y Controller for 70-105MP alph high pressure measuring well |
| 11/07/1995 | US5464058 Method of using a polished rod transducer |
| 11/02/1995 | WO1995029319A1 System and method for precision downhole tool-face setting and survey measurement correction |
| 11/02/1995 | EP0679216A1 Method for determining borehole direction. |
| 11/01/1995 | CN1111002A Method for testing water-covering oil layer saturation degree by using normal boring sample-test reference |
| 10/31/1995 | US5461909 Oxygen activation method for quantitative water flow measurements within and behind well bore casing |
| 10/25/1995 | EP0678880A1 Inductive coupler for well tools |
| 10/24/1995 | CA2098675C Methods and apparatus for preventing jamming of encoder of logging while drilling tool |
| 10/23/1995 | CA2147558A1 Inductive coupler for well tools |
| 10/19/1995 | DE4413180A1 Long-term installation of optical fibre cable-connected instrument |
| 10/18/1995 | EP0677640A1 Improvements in or relating to steerable rotary drilling systems |
| 10/18/1995 | CN2210251Y Borehole valve testing petroleum with three pin and inner spline |
| 10/18/1995 | CN2210250Y Survey of slope and dropping proof device |
| 10/18/1995 | CN2210249Y Automatic vacuum distillation gas remover for well drilling liquid |
| 10/17/1995 | US5459697 MWD surface signal detector having enhanced acoustic detection means |
| 10/17/1995 | US5458466 Monitoring pump stroke for minimizing pump-off state |
| 10/17/1995 | US5458208 Directional drilling using a rotating slide sub |
| 10/17/1995 | US5458006 For collecting gas from the ground |
| 10/17/1995 | US5457995 Horizontal boring pipe penetration detection system and method |
| 10/17/1995 | US5457988 Side pocket mandrel pressure measuring system |
| 10/12/1995 | WO1995027222A1 Acoustic sensor |
| 10/10/1995 | US5456316 Downhole signal conveying system |
| 10/10/1995 | US5456106 Down hole assembly |
| 10/10/1995 | CA2034444C Method and apparatus for the determination of formation fluid flow rates and reservoir deliverability |
| 10/04/1995 | CN2209212Y General instrument core for multifunctional electronic gyro directional logging instrument |
| 10/03/1995 | US5455804 Vortex chamber mud pulser |
| 10/03/1995 | US5455780 Computer-implemented method of simulating material flow in gas/oil wells |
| 10/03/1995 | US5455573 Inductive coupler for well tools |
| 10/03/1995 | US5454436 Method of warning of pipe sticking during drilling operations |
| 09/28/1995 | DE4409184A1 Securely held extensometer for detection of positional changes in e.g. rock |