| Patents for E21B 47 - Survey of boreholes or wells (31,352) |
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| 07/21/1981 | CA1105617A1 Method and means for transmitting measuring data |
| 07/14/1981 | US4278128 Petroleum recovery chemical retention prediction technique |
| 07/07/1981 | US4276943 Fluidic pulser |
| 06/30/1981 | US4275935 Drilling stabilizer |
| 06/23/1981 | CA1103802A2 Simulator for an oil well circulation system |
| 06/16/1981 | US4273212 Oil and gas well kick detector |
| 06/16/1981 | US4273187 Injection-soak-production cycle |
| 06/09/1981 | US4271696 Method of determining change in subsurface structure due to application of fluid pressure to the earth |
| 06/09/1981 | CA1102913A1 Digital motor control method and apparatus for measuring-while-drilling |
| 06/09/1981 | CA1102875A1 Method and apparatus for the exploration of boreholes |
| 06/02/1981 | CA1102150A1 Weight-on-bit measuring apparatus |
| 05/26/1981 | US4269063 Downhole force measuring device |
| 05/26/1981 | CA1102014A1 Method and apparatus for measuring azimuth and speed of horizontal fluid flow by a borehole |
| 05/19/1981 | US4267727 Pressure and temperature compensation means for a downhole force measuring device |
| 05/19/1981 | US4267726 Well pressure testing method |
| 05/13/1981 | EP0028296A2 Arrangement for power-supply and measurement-data transmission from a central station to several measurement posts |
| 05/12/1981 | US4266608 Method for detecting underground conditions |
| 05/12/1981 | US4266606 Hydraulic circuit for borehole telemetry apparatus |
| 05/05/1981 | US4265305 Mounting and shock absorber assembly for borehole telemetry apparatus |
| 05/05/1981 | US4265110 Downhole cable tension measuring apparatus |
| 05/05/1981 | US4265028 Survey apparatus and method employing canted tilt sensor |
| 04/30/1981 | WO1981001168A1 Monitoring equipment for drilling operations |
| 04/28/1981 | US4264329 Tracing flow of fluids |
| 04/28/1981 | CA1100032A1 Single well surfactant test to evaluate surfactant floods using multi tracer method |
| 04/14/1981 | US4262343 Pressure pulse detection apparatus |
| 04/08/1981 | EP0026706A1 Process and device for determining the directional parameters of a continuously explored well |
| 04/08/1981 | EP0026188A1 Apparatus for well logging while drilling |
| 04/07/1981 | CA1099033A1 Method of measuring horizontal fluid flow behind casing with sequential logging |
| 03/31/1981 | US4258788 CPI Casing |
| 03/24/1981 | CA1098220A1 Method for investigating the front profile during flooding of formations |
| 03/24/1981 | CA1098202A1 Telemetry system |
| 03/17/1981 | US4255975 Device for the precise measurement of movements or deformations |
| 03/10/1981 | US4255798 Method and apparatus for acoustically investigating a casing and cement bond in a borehole |
| 03/10/1981 | US4254832 Sampler and measurement apparatus |
| 03/03/1981 | US4254481 Borehole telemetry system automatic gain control |
| 03/03/1981 | CA1096953A1 Remote istrumentation apparatus |
| 02/24/1981 | US4252195 Well test systems and methods |
| 02/24/1981 | US4252190 Wireline stabilization method and apparatus |
| 02/24/1981 | US4252015 Wellbore pressure testing method and apparatus |
| 02/24/1981 | US4251921 Caliper and contour tool |
| 02/17/1981 | US4251773 Method and apparatus for exploration of geological formation tilt in boreholes |
| 02/17/1981 | CA1095889A1 Well tool apparatus and method |
| 02/11/1981 | EP0023850A1 Cryostat for photon detector and its use in a borehole logging tool |
| 02/10/1981 | US4249603 Doping a retort with radioactive nuclides to determine the locus of a processing zone |
| 02/10/1981 | US4249602 Method of doping retort with a halogen source to determine the locus of a processing zone |
| 02/10/1981 | US4249598 Outdoor well depth indicator |
| 02/04/1981 | EP0023399A2 Method and apparatus for testing petroleum wells |
| 02/03/1981 | US4248300 Method of and apparatus for positioning retrievable landing nipple in a well bore string |
| 02/03/1981 | US4248298 Well logging evaporative thermal protection system |
| 02/03/1981 | US4247985 TFL Caliper |
| 02/03/1981 | CA1095186A1 Method for detecting fractures in formations surrounding earth boreholes |
| 02/03/1981 | CA1095185A1 Method for monitoring fluid movement behind casing in oil and gas wells |
| 02/03/1981 | CA1094799A1 Method of determining the integrity of abandonment plugs in wells |
| 01/20/1981 | US4245498 Well surveying instrument sensor |
| 01/13/1981 | US4244424 Magnetic casing depth marker |
| 01/13/1981 | US4244116 Devices for measuring the azimuth and the slope of a drilling line |
| 01/13/1981 | CA1093458A1 Well testing tool system |
| 01/07/1981 | EP0020824A1 Push drill guidance system |
| 01/07/1981 | EP0020416A1 Improvements in and relating to electrical power transmission in fluid wells |
| 01/06/1981 | US4243099 Selectively-controlled well bore apparatus |
| 01/06/1981 | CA1092968A1 Hydraulic test tool and method |
| 12/30/1980 | US4241796 Active drill stabilizer assembly |
| 12/30/1980 | US4241592 Cryostat for borehole sonde employing semiconductor detector |
| 12/30/1980 | CA1092676A1 Self-purging electrical connector |
| 12/30/1980 | CA1092532A1 Kelly and saver sub combination with telemetering means |
| 12/16/1980 | US4238889 Devices for the azimuth and slope scanning of a drilling line |
| 12/16/1980 | CA1091797A1 Method and apparatus for deriving compensated measurements in a borehole |
| 12/16/1980 | CA1091471A1 Method and apparatus for logging earth boreholes using self-contained logging instrument |
| 12/12/1980 | EP0014204A4 Metal type detector for drill pipes. |
| 12/10/1980 | EP0019672A1 Method of and device for recording data down-hole in a well bore |
| 12/09/1980 | US4238158 Visual investigation method |
| 12/02/1980 | CA1090698A1 Well logging method and apparatus using friction- reducing agents |
| 11/26/1980 | EP0019091A1 Method and apparatus for pipe inspection |
| 11/25/1980 | US4235021 Measuring while drilling tool |
| 11/11/1980 | US4233508 Water injection profiling |
| 11/11/1980 | US4232736 Leak detection system and control using non-rigid bladder |
| 11/11/1980 | CA1089354A1 Method and apparatus for logging earth boreholes using self-contained logging instruments |
| 11/04/1980 | US4231426 Method of using tracer fluids for enhanced oil recovery |
| 11/04/1980 | US4231252 Borehole direction measurement means |
| 10/28/1980 | US4230187 Methods and apparatus for sensing wellhead pressure |
| 10/21/1980 | US4228855 Method of injectivity profile logging for two phase flow |
| 10/14/1980 | US4228350 Method and apparatus for measuring underground fluid flow characteristics |
| 10/14/1980 | US4227405 Digital mineral logging system |
| 10/14/1980 | US4227404 Digital mineral logging system |
| 10/14/1980 | CA1087704A2 Well tool apparatus and method |
| 10/07/1980 | US4226116 Logging while raising a drill string |
| 10/02/1980 | WO1980002053A1 Method of continuous logging of borehole |
| 10/02/1980 | WO1980002052A1 Method for determining the depth of occurrence of chemically aggressive stratum |
| 10/02/1980 | WO1980002051A1 Apparatus for well logging while drilling |
| 10/02/1980 | WO1980002050A1 Method for determining the depth of occurrence of fluid saturated stratum and the type of fluid |
| 09/30/1980 | US4224988 Device for and method of sensing conditions in a well bore |
| 09/30/1980 | CA1086852A1 Gathering line leak detection system tester |
| 09/30/1980 | CA1086636A1 Method and apparatus using flexible hose in logging highly deviated or very hot earth boreholes |
| 09/23/1980 | US4224687 Pressure pulse detection apparatus incorporating noise reduction feature |
| 09/23/1980 | US4223746 Shock limiting apparatus |
| 09/23/1980 | US4223727 Method of injectivity profile logging for two phase flow |
| 09/23/1980 | US4223725 Method for reservoir fluid drift rate determination |
| 09/17/1980 | EP0015726A1 Method relating to the pumping of fluid along a tubular structure in a bore of a well and tubular component for use in such structure |
| 09/16/1980 | US4222444 Method of well fluid leak prevention |
| 09/02/1980 | US4220381 Drill pipe telemetering system with electrodes exposed to mud |