| Patents for E21B 47 - Survey of boreholes or wells (31,352) |
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| 03/23/1994 | EP0424452B1 Plug for well logging operations |
| 03/23/1994 | EP0272320B1 Homogeneous fluoroassay methods employing fluorescent background rejection |
| 03/22/1994 | US5295548 Bottom-hole information collecting equipment |
| 03/18/1994 | EP0588954A4 Method and apparatus for detecting boundary stratum. |
| 03/17/1994 | WO1994005941A1 Guided mole |
| 03/17/1994 | DE4230919A1 Einzel-Bohrloch-Verfahren und -Vorrichtung zur gleichzeitigen Ermittlung der Grundwasser-Strömungsrichtung und -geschwindigkeit Single-hole method and apparatus for the simultaneous determination of the groundwater flow direction and velocity |
| 03/17/1994 | DE4230624A1 Remote controlled mechanical mole - has streamlined casing mounted on hollow cylindrical shock absorber |
| 03/17/1994 | CA2142123A1 Guided mole |
| 03/16/1994 | EP0587203A1 Methods and apparatus for preventing jamming of encoder of logging while drilling tool |
| 03/16/1994 | EP0586428A1 Apparatus for measuring the profile of a moving object. |
| 03/16/1994 | CN1083894A Method for measurement of borehole through obtaining of cores with ropes and apparatus for carrying out same |
| 03/15/1994 | US5293937 Acoustic system and method for performing operations in a well |
| 03/15/1994 | US5293931 Modular, multi-level groundwater sampler |
| 03/15/1994 | CA1327789C Drilling system |
| 03/08/1994 | US5291777 System for monitoring oil well performance |
| 03/03/1994 | WO1994004790A1 Protective arrangements for downhole tools |
| 03/02/1994 | EP0584998A2 Method and device for detecting pressure pulses |
| 03/02/1994 | EP0417263B1 Control device and process for drilling by vibration analysis |
| 03/02/1994 | CN1083165A Suspended digital control marking device for well logging cable |
| 02/24/1994 | DE4226613C1 Hermeticity testing of casing cementation - of gas storage cavern, with stored medium level change compensation |
| 02/23/1994 | CN2157305Y Low-speed enclosed hydraulic transmission for logging winch |
| 02/23/1994 | CN1082659A Method and device for automatic monitoring oil-well level |
| 02/22/1994 | US5289354 Method for acoustic transmission of drilling data from a well |
| 02/22/1994 | CA2024081C Method and apparatus for logging short radius horizontal drainholes |
| 02/16/1994 | EP0485488B1 Total-field imaging probe |
| 02/15/1994 | US5285853 Casing hanger seal with test port |
| 02/15/1994 | US5285683 Method and apparatus for determining orientation of a wellbore relative to formation stress fields |
| 02/15/1994 | CA1327035C Core drilling tool |
| 02/08/1994 | US5285388 Detection of fluid reflection for echo sounding operation |
| 02/08/1994 | US5285065 Natural gamma ray logging sub |
| 02/08/1994 | US5284422 Method of monitoring and controlling a well pump apparatus |
| 02/08/1994 | CA2015318C Power sources for downhole electrical heating |
| 02/08/1994 | CA2011911C Single-well internally calibrated method for determining residual oil saturation |
| 02/02/1994 | CN2154906Y Automotive wholly-enclosed detecting mechanism for test well of oil field |
| 02/02/1994 | CN1081491A Survey of wells by radioactive isotope tracking method |
| 02/01/1994 | USH1289 Borehole televiewer system depth monitoring and recording system |
| 02/01/1994 | US5283768 Borehole liquid acoustic wave transducer |
| 02/01/1994 | US5282384 Method for calculating sedimentary rock pore pressure |
| 01/25/1994 | US5281023 Method and apparatus for automatically controlling a well fracturing operation |
| 01/25/1994 | CA1326519C Liquid-level detector |
| 01/19/1994 | EP0579392A1 Cooled downhole tool |
| 01/19/1994 | EP0408667B1 Acoustic data transmission through a drill string |
| 01/19/1994 | CN2153632Y Double-sided main electrode detecting device |
| 01/18/1994 | US5279373 Controllable drill head |
| 01/18/1994 | US5279366 Method for wireline operation depth control in cased wells |
| 01/12/1994 | CN1080687A Perforation depth measuring method for oil pipe delivery and measuring instrument |
| 01/11/1994 | US5278758 Method and apparatus for nuclear logging using lithium detector assemblies and gamma ray stripping means |
| 01/11/1994 | US5278550 For use in association with a subsurface apparatus |
| 01/11/1994 | US5278549 Wireline cycle life counter |
| 01/11/1994 | US5277495 Temperature to frequency converter |
| 01/11/1994 | US5277062 Measuring in situ stress, induced fracture orientation, fracture distribution and spacial orientation of planar rock fabric features using computer tomography imagery of oriented core |
| 01/11/1994 | US5277061 Method for determining the rotation speed of a drill bit |
| 01/09/1994 | CA2100010A1 Refrigerant-cooled downhole tool and method |
| 01/06/1994 | WO1994000670A1 Survey process for cable core borings and device for implementing it |
| 01/06/1994 | WO1994000669A1 Method and apparatus for inspecting subsurface environments |
| 01/06/1994 | CA2138013A1 Method and apparatus for inspecting subsurface environments |
| 01/05/1994 | CN2152326Y Small laser direction pointing instrument |
| 01/05/1994 | CN2152075Y Inspection instrument for borehole |
| 01/04/1994 | US5276656 Method for fluid identification and evaluation within wellbores using ultrasonic scanning |
| 01/04/1994 | US5275040 Method of and apparatus for detecting an influx into a well while drilling |
| 01/04/1994 | US5275038 Downhole reeled tubing inspection system with fiberoptic cable |
| 12/29/1993 | EP0576401A2 Borehole assembly, method and composition therefor |
| 12/29/1993 | EP0576210A1 Determining elastic anistropy in subterranean formations |
| 12/28/1993 | US5274606 Circuit for echo and noise suppression of accoustic signals transmitted through a drill string |
| 12/28/1993 | US5274552 Drill string motion detection for bit depth calculation |
| 12/28/1993 | US5273122 Automatic method for monitoring the vibrational state of a drill string |
| 12/28/1993 | US5272925 For driving drill pipe in rotation |
| 12/28/1993 | US5272916 Methods of detecting and measuring in-situ elastic anisotropy in subterranean formations |
| 12/25/1993 | CA2072203A1 Core orientation device |
| 12/22/1993 | CN2150332Y Device for measuring depth of well |
| 12/21/1993 | US5272680 Method of decoding MWD signals using annular pressure signals |
| 12/21/1993 | US5271469 Borehole stressed packer inflation system |
| 12/21/1993 | CA1325476C High speed well surveying and land navigation |
| 12/15/1993 | EP0574237A2 Azimuthal strike orientation measurement in subterranean formation |
| 12/15/1993 | CN2149478Y Fluid sensor for oil well |
| 12/14/1993 | US5269383 Navigable downhole drilling system |
| 12/14/1993 | US5269374 Locator method and apparatus |
| 12/14/1993 | CA1325278C Method of analysing fluid influxes in hydrocarbon wells |
| 12/07/1993 | US5267469 Method and apparatus for testing the physical integrity of production tubing and production casing in gas-lift wells systems |
| 12/01/1993 | EP0572309A2 Method and apparatus for electromagnetic logging |
| 12/01/1993 | CN2148176Y Light electric spark inclinometer |
| 12/01/1993 | CN2148175Y Electric isotope releasing device |
| 11/30/1993 | US5265682 Steerable rotary drilling systems |
| 11/30/1993 | US5265680 Method for installing instruments in wells |
| 11/30/1993 | US5265677 Refrigerant-cooled downhole tool and method |
| 11/30/1993 | US5265466 Rod insertion method and friction reducing device |
| 11/24/1993 | EP0570695A2 Method and apparatus for the downhole measurement of elastic rock properties |
| 11/24/1993 | CN2147346Y Multi-function well controlling pressure testing joint |
| 11/23/1993 | US5264795 System transmitting and receiving digital and analog information for use in locating concealed conductors |
| 11/23/1993 | CA1324572C Drilling rig and its multiple direction anchoring device to a well |
| 11/11/1993 | WO1993022645A1 Remotely deployable pressure sensor |
| 11/10/1993 | EP0568746A2 Determining stimulation related characteristics of subterranean zone |
| 11/10/1993 | CN2146093Y Deep well colour TV observation appliance |
| 11/10/1993 | CN2145865Y Oil well hollow sucker rod pressure meter |
| 11/09/1993 | US5259468 Method of dynamically monitoring the orientation of a curved drilling assembly and apparatus |
| 11/02/1993 | US5258755 Two-source magnetic field guidance system |
| 11/02/1993 | US5257530 Acoustic sand detector for fluid flowstreams |
| 10/28/1993 | WO1993021545A1 Drill string motion detection for bit depth calculation |
| 10/27/1993 | CN2144710Y Water finder collecting ball fixture for oil well |
| 10/27/1993 | CN1077775A Full-electrode logging method |