| Patents for E21B 47 - Survey of boreholes or wells (31,352) |
|---|
| 05/29/1990 | US4928760 Downhole coupon holder |
| 05/29/1990 | US4928759 Tubing conveyed wellbore fluid flow measurement system |
| 05/29/1990 | US4928758 Downhole wellbore flowmeter tool |
| 05/29/1990 | US4928522 Steam injection survey apparatus and method for testing wells |
| 05/29/1990 | US4928520 Plug release indicator |
| 05/29/1990 | CA1269710A1 Method for determining the distance between adjacent wells |
| 05/29/1990 | CA1269613A1 Downhole corrosion coupon holder |
| 05/28/1990 | CA2002484A1 Wellbore tool with hall effect coupling |
| 05/22/1990 | US4928088 Apparatus for extracting recorded information from a logging tool |
| 05/22/1990 | US4928031 Pressure/temperature compensated transducer pad assembly |
| 05/22/1990 | US4926940 Method for monitoring the hydraulic fracturing of a subsurface formation |
| 05/16/1990 | EP0368437A2 Downhole tester valve and probe |
| 05/16/1990 | CN2057212U Ground recording unit for repeating stratigraphic survey |
| 05/16/1990 | CN2057211U Obstruction preventer |
| 05/15/1990 | US4924950 Method of drilling a well by utilizing AE/MA measurement |
| 05/15/1990 | US4924701 Pressure measurement system |
| 05/15/1990 | US4924596 Method for correcting slippage during wireline depth measurements |
| 05/15/1990 | CA1269166A1 Method and apparatus for determining cement conditions |
| 05/09/1990 | EP0367505A2 Pressure monitoring apparatus and method |
| 05/09/1990 | EP0367376A2 Apparatus and method for testing a blow-out prevention device |
| 05/09/1990 | EP0366708A1 Probe for optically monitoring progress of in-situ vitrification of soil |
| 05/08/1990 | CA1268850A1 Downhole casing inspection system |
| 05/03/1990 | WO1990004697A1 Downhole combination tool |
| 05/02/1990 | EP0366567A2 Downhole combination tool |
| 05/01/1990 | US4921055 Soil displacement hammer |
| 05/01/1990 | US4921044 Well injection systems |
| 05/01/1990 | US4920655 High speed well surveying and land navigation |
| 04/24/1990 | US4919206 Method for preventing bitumen backflow in injection wells when steam injection is interrupted |
| 04/24/1990 | CA1268218A1 Oil recovery system and method of using microwave energy |
| 04/24/1990 | CA1268052A1 Measure while drilling systems |
| 04/18/1990 | EP0364362A1 Method and device for logging non-eruptive wells |
| 04/18/1990 | EP0364217A2 Improved torsional wave fluid sensor and system |
| 04/18/1990 | EP0363508A1 A method of controlling the flow of landfill gas from sanitary landfills and apparatus for performing the method |
| 04/18/1990 | CN2056191U Two-phase three-component measuring device |
| 04/17/1990 | US4918669 Method and apparatus for sonic dip measurement |
| 04/10/1990 | US4916617 Controller for well installations |
| 04/10/1990 | US4916400 Method for determining characteristics of the interior geometry of a wellbore |
| 04/10/1990 | US4916312 Device for placing a radioactive source in a formation through which a borehole passes |
| 04/10/1990 | US4915168 Multiple well tool control systems in a multi-valve well testing system |
| 04/10/1990 | US4914826 Decentralized well logging apparatus for measuring the diameters of a borehole along its perpendicular diametrical axes |
| 04/10/1990 | CA1267707A1 Above-ground arrangement for and method of locating a discrete inground boring device |
| 04/04/1990 | EP0362011A1 Method and apparatus for analysing a multi-phase flow in a hydrocarbon well |
| 04/04/1990 | EP0361996A1 Depth determination system utilizing parameter estimation for a downhole well logging apparatus |
| 04/04/1990 | EP0361805A1 Percussive mole boring device with electronic transmitter |
| 04/03/1990 | US4914637 Measure while drilling system |
| 04/03/1990 | US4914433 Conductor system for well bore data transmission |
| 04/03/1990 | US4914432 Apparatus for locating a member in a borehole |
| 04/03/1990 | US4912971 System for recovery of petroleum from petroleum impregnated media |
| 04/03/1990 | CA1267359A1 Temporary protection device and method for a servicing tool or measuring instrument at the head of a column |
| 03/28/1990 | CN2055182U Amagnetism sensor for single-point type inclination measuring set |
| 03/28/1990 | CN2055181U Acoustic amplitude logging instrument |
| 03/27/1990 | US4912683 Method for acoustically measuring wall thickness of tubular goods |
| 03/27/1990 | US4912415 Sonde of electrodes on an earth drill for measuring the electric formation resistivity in earth strata |
| 03/21/1990 | EP0359642A1 Method and apparatus for measuring subsidence |
| 03/21/1990 | EP0359427A1 Method for monitoring and controlling scale formation in a well |
| 03/21/1990 | EP0324778A4 Boring apparatus. |
| 03/21/1990 | CN1007213B Discharge logging device of oil-producing well |
| 03/20/1990 | US4909741 Wellbore tool swivel connector |
| 03/20/1990 | US4909336 Drill steering in high magnetic interference areas |
| 03/13/1990 | US4908804 Combinatorial coded telemetry in MWD |
| 03/13/1990 | US4907828 Alignable, threaded, sealed connection |
| 03/13/1990 | US4907658 Percussive mole boring device with electronic transmitter |
| 03/13/1990 | US4907649 Restriction subs for setting cement plugs in wells |
| 03/07/1990 | EP0357314A2 Device for controlling the position of a self-propelled drilling tool |
| 03/07/1990 | CN1040245A Explanation and processing method for well logging information |
| 03/06/1990 | US4905778 Device for producing pressure pulses in an oil well fluid medium |
| 03/06/1990 | US4905774 Process and device for guiding a drilling tool through geological formations |
| 03/06/1990 | US4905773 Self-propelled subsoil penetrating tool system |
| 03/06/1990 | US4905763 Method for servicing offshore well |
| 02/27/1990 | US4905203 Downhole doppler flowmeter |
| 02/27/1990 | US4904081 Surveying apparatus |
| 02/21/1990 | CN1006920B Method for temp. measuring of small-sized well |
| 02/20/1990 | US4903245 Downhole vibration monitoring of a drillstring |
| 02/20/1990 | US4902981 Well casing potential measurement tool with compensated DC errors |
| 02/20/1990 | US4902976 Probe for detecting the presence of magnetic material in a ground hole |
| 02/20/1990 | US4901804 Articulated downhole surveying instrument assembly |
| 02/20/1990 | US4901761 Closure apparatus with pressure test device |
| 02/20/1990 | US4901563 System for monitoring fluids during well stimulation processes |
| 02/13/1990 | US4901290 Apparatus for the generation of pressure pulses in drilling mud compositions |
| 02/13/1990 | US4901289 System for acquiring and recording signals delivered by a set of sensors disposed in well probes |
| 02/13/1990 | US4901070 Pressure monitoring system with isolating means |
| 02/13/1990 | US4901069 Apparatus for electromagnetically coupling power and data signals between a first unit and a second unit and in particular between well bore apparatus and the surface |
| 02/13/1990 | US4900937 Well logging detector with decoupling optical interface |
| 02/13/1990 | US4899833 Downhole drilling assembly orienting device |
| 02/08/1990 | WO1990001104A1 A system and method for locating an underground probe |
| 02/07/1990 | EP0353838A1 Weight-on-bit and torque measuring apparatus |
| 02/07/1990 | EP0353275A1 Shut-in tool. |
| 02/07/1990 | CN1039464A Drill pipes and casings utilizing multi-conduit tubulars |
| 02/06/1990 | US4899320 Downhole tool for determining in-situ formation stress orientation |
| 02/06/1990 | US4899277 Bore hole scanner with position detecting device and light polarizers |
| 02/06/1990 | US4898240 System for moving a set of instruments and a method for measurement and/or intervention in a well |
| 02/06/1990 | US4898237 Probe and its multidirectional anchoring device in a well |
| 02/06/1990 | US4898236 Drill stem testing system |
| 02/06/1990 | CA1265582A1 Current sensing alarm arrangement for monitoring the presence of high voltage |
| 01/30/1990 | US4897646 Method and apparatus for reducing the effective bandwidth of ultrasonic waveform for transmission over a logging cable |
| 01/30/1990 | US4896722 Multiple well tool control systems in a multi-valve well testing system having automatic control modes |
| 01/30/1990 | CA1265123A1 Mechanically actuated whipstock assembly |
| 01/30/1990 | CA1264934A1 Curvature probe and method |
| 01/25/1990 | WO1990000667A1 Plug for well logging operations |
| 01/25/1990 | WO1990000666A1 Device for steering the direction of drilling |