| Patents for E21B 47 - Survey of boreholes or wells (31,352) |
|---|
| 07/12/1977 | US4035763 Wireline tool for measuring bottom-hole pressure in pumping wells |
| 07/12/1977 | US4035640 Behind casing water flow detection using pulsed neutron oxygen activation |
| 07/12/1977 | US4034808 Method for pump-off detection |
| 07/05/1977 | US4033429 Downhole seismic source |
| 07/05/1977 | US4033413 Wire line well tool and method |
| 07/05/1977 | US4033187 Well flow measuring apparatus |
| 07/05/1977 | US4033186 Method and apparatus for down hole pressure and temperature measurement |
| 06/28/1977 | US4032780 Behind casing water flow detection using continuous oxygen activation |
| 06/28/1977 | US4032779 Behind casing water volume flow rate measurement using concentric gamma ray detectors |
| 06/28/1977 | US4032778 Behind casing water volume flow rate measurement using gamma ray spectral degradation |
| 06/28/1977 | US4032040 Method and control system for batching plural substances and pump system |
| 06/28/1977 | US4031751 Closed system for testing the condition of well bore formations |
| 06/28/1977 | US4031750 Apparatus for logging inclined earth boreholes |
| 06/21/1977 | US4030354 Testing of ram and annular blowout preventers |
| 06/14/1977 | US4029148 Well fracturing method |
| 06/07/1977 | US4028660 Well logging method and means using an armored multiconductor coaxial cable |
| 06/07/1977 | US4028546 Behind well casing water flow detection system |
| 06/07/1977 | US4028011 Low well yield control system |
| 06/07/1977 | US4027399 Positional sensing |
| 05/31/1977 | US4027286 Multiplexed data monitoring system |
| 05/31/1977 | US4027282 Methods and apparatus for transmitting information through a pipe string |
| 05/31/1977 | US4026371 Pilot head for laying pipes in the ground |
| 05/31/1977 | US4026363 Apparatus and method for performing a desired operation at a specified location in a well |
| 05/10/1977 | US4023201 Infrared thermography for determining equipment temperatures in oil well fires |
| 05/10/1977 | US4023136 Borehole telemetry system |
| 05/10/1977 | US4023092 Apparatus for sensing metal in wells |
| 05/10/1977 | US4021925 Apparatus for and process of determining the internal diameter of pipelines |
| 05/03/1977 | US4021774 Borehole sensor |
| 05/03/1977 | US4021773 Acoustical pick-up for reception of signals from a drill pipe |
| 04/26/1977 | US4019576 Oil recovery from an oil-water well |
| 04/19/1977 | US4019148 Lock-in noise rejection circuit |
| 04/19/1977 | US4019126 Dipmeter means utilizing generated eddy currents and lines of flux in an earth formation |
| 04/19/1977 | US4018276 Blowout preventer testing apparatus |
| 04/19/1977 | US4018088 Borehole pressure measurement apparatus having a high pressure float valve |
| 04/12/1977 | US4016942 Method and apparatus for indicating the position of one well bore with respect to a second well bore |
| 04/12/1977 | US4016655 Boring rig alignment apparatus and method |
| 04/05/1977 | US4015673 Directional drilling system |
| 04/05/1977 | US4015469 Pump-off monitor for rod pump wells |
| 03/29/1977 | US4015234 Apparatus for measuring and for wireless transmission of measured values from a bore hole transmitter to a receiver aboveground |
| 03/29/1977 | US4015194 Oil well logging device having plural well fluid parameter measuring devices and a single conductor for accommodating both measurement and power signals |
| 03/22/1977 | US4013945 Rotation sensor for borehole telemetry |
| 03/22/1977 | US4013124 Method for obtaining information from a well by use of a gas operated hydraulically actuated wire line packer |
| 03/22/1977 | US4013123 Hydraulically actuated wire line apparatus |
| 03/15/1977 | US4012712 System for telemetering well logging data |
| 03/08/1977 | US4010642 Borehole pressure measurement |
| 03/08/1977 | US4010633 Annular seal |
| 03/01/1977 | US4010476 Methods and apparatus for recording well logging measurements |
| 03/01/1977 | US4009613 Apparatus and method for indicating at the surface the measurement of a downhole condition |
| 03/01/1977 | US4009609 Method and apparatus for testing a subsurface formation for fluid retention potential |
| 02/22/1977 | US4008763 Well treatment method |
| 02/22/1977 | US4008608 Method of predicting geothermal gradients in wells |
| 02/08/1977 | US4007366 Radioactive tracer profiling system and apparatus |
| 02/08/1977 | US4006777 Free floating carrier for deep well instruments |
| 02/08/1977 | US4006530 Apparatus for measuring the diameter of a well bore |
| 01/18/1977 | US4003250 Geothermal heat flux transducers |
| 01/11/1977 | US4003017 Continuous bit positioning system |
| 01/04/1977 | US4001775 Automatic bit synchronization method and apparatus for a logging-while-drilling receiver |
| 01/04/1977 | US4001774 Method of transmitting signals from a drill bit to the surface |
| 01/04/1977 | US4001773 Acoustic telemetry system for oil wells utilizing self generated noise |
| 12/21/1976 | US3998096 Subsurface differential pressure recorder |
| 12/14/1976 | US3997867 Well bore data-transmission apparatus |
| 12/14/1976 | US3997008 Drill director |
| 12/14/1976 | US3997003 Time delay nipple locator and/or decelerator for pump down well tool string operations |
| 12/07/1976 | US3995479 Apparatus for protecting downhole instruments from torsional and lateral movements |
| 11/30/1976 | US3994163 Stuck well pipe apparatus |
| 11/23/1976 | US3993974 Seismic method for determining the position of the bit on a drill stem in a deep borehole |
| 11/23/1976 | US3993131 Tracing flow of petroleum in underground reservoirs |
| 11/23/1976 | US3993127 Apparatus for positioning a working implement in a borehole |
| 11/23/1976 | US3992927 Soil movement detection apparatus |
| 11/16/1976 | US3992095 Optics module for borehole stress measuring instrument |
| 11/16/1976 | US3991827 Well consolidation method |
| 11/16/1976 | US3991611 Digital telemetering system for subsurface instrumentation |
| 11/16/1976 | US3991610 Apparatus for carrying out underground measurements during drilling of underground strata |
| 11/09/1976 | US3990304 Fluid interface measuring device for use in earth boreholes |
| 11/09/1976 | US3990298 Method of determining the relation between fractional flow and saturation of oil |
| 10/26/1976 | US3987850 Well completion method for controlling sand production |
| 10/19/1976 | US3986393 Precision measuring system for down-hole production logging oil tools |
| 10/12/1976 | US3985027 Controlled flow impedance in a pressure sensing system |
| 10/12/1976 | US3984918 Inclinometer |
| 10/05/1976 | US3984627 Or caisson or the like |
| 10/05/1976 | US3983948 Method and apparatus for indicating the orientation of a down hole drilling assembly |
| 09/28/1976 | US3982433 Spinner tool for boreholes |
| 09/28/1976 | US3982431 Control system for borehole sensor |
| 09/28/1976 | US3982324 Method of determining actual size of flow openings in a tubular member located in a well |
| 09/21/1976 | US3982224 Method and apparatus for transmitting downhole information from a well |
| 09/21/1976 | US3981187 Method for measuring the thermal conductivity of well casing and the like |
| 09/21/1976 | US3981186 Device for blocking at a given torque a rotating machine driven by a hydraulic turbine |
| 09/14/1976 | US3980986 Oil well survey tool |
| 09/14/1976 | US3980881 Simultaneous logging system for deep wells |
| 09/07/1976 | US3979724 Seismic method for determining the position of the bottom of a long pipe in a deep borehole |
| 09/07/1976 | US3979716 Means and method for transmitting a high count rate pulse signal over a common well logging cable |
| 09/07/1976 | US3979140 Seismic method for logging position of a deep borehole in the earth |
| 09/07/1976 | US3978924 Hidden bow spring for calipers and centralizers |
| 09/07/1976 | US3978588 Magnetic wire line marking, erasing and detecting method and apparatus |
| 08/31/1976 | US3977468 Well bore caliper and centralizer apparatus having articulated linkage |
| 08/31/1976 | US3977245 Down hole apparatus for sensing and storing values of physical parameters |
| 08/24/1976 | US3975941 Oil well rate metering method |
| 08/17/1976 | US3974690 Method of and apparatus for measuring annulus pressure in a well |
| 08/10/1976 | US3974330 Miniature underwater bore hole inspection apparatus |
| 08/10/1976 | US3973626 Well completion in permafrost |