| Patents for E21B 47 - Survey of boreholes or wells (31,352) |
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| 06/15/2011 | EP2331788A1 Reservoir monitoring apparatus and method |
| 06/15/2011 | CN201865665U Optical coupling para-position structure of optically coupled intelligent drilling tool |
| 06/15/2011 | CN201865664U Geared drill punching depth indicator |
| 06/15/2011 | CN201865663U Inertia measurement unit and power tuning gyroscope continuous inclinometry system |
| 06/15/2011 | CN201865662U Device on water distributor for ensuring flow measurement and adjustment accuracy |
| 06/15/2011 | CN201865661U Hanging device of testing instrument for through tubing bailing well |
| 06/15/2011 | CN201865660U Fully automatic well pumping unit photoelectric detecting device |
| 06/15/2011 | CN201865659U Hydrogen sulphide early warning measuring equipment |
| 06/15/2011 | CN201865658U Foam drilling integrated logging engineering parameter collector |
| 06/15/2011 | CN201865657U High strength abutting tool |
| 06/15/2011 | CN201865656U Down-hole parameter acquisition system of intelligent intermittent pumping machine |
| 06/15/2011 | CN201865655U Multiphase multi-well automatic control device of crude oil |
| 06/15/2011 | CN1624295B stratum measuring apparatus and stratum measuring method |
| 06/15/2011 | CN102096107A Method for evaluating permeability of reservoir layer according to interval transit time and density inversed pore flat degree |
| 06/15/2011 | CN102095451A Fiber grating liquid flow sensor with temperature compensation |
| 06/15/2011 | CN102094678A Method for identifying water-bursting risks in karst tunnels |
| 06/15/2011 | CN102094645A Small-bore microspherically-focused logging instrument |
| 06/15/2011 | CN102094643A Di-gamma logging instrument |
| 06/15/2011 | CN102094642A Intraformationally heterogeneous model oil-water displacement efficiency evaluation system |
| 06/15/2011 | CN102094638A Winch panel system |
| 06/15/2011 | CN102094637A Method for detecting digital acoustic head waves |
| 06/15/2011 | CN102094636A Method for extracting sound wave attributes in mineshaft |
| 06/15/2011 | CN102094635A Logging data transmission system and transmission method thereof |
| 06/15/2011 | CN102094634A Method for correcting porosity of compensated neutrons |
| 06/15/2011 | CN102094633A Hole caliper for logging diameter of bored shaft |
| 06/15/2011 | CN102094632A Mud pressure and density logging instrument |
| 06/15/2011 | CN102094631A Method for positioning underground sleeve by measuring gradient of geomagnetic field |
| 06/15/2011 | CN102094630A Portable angular difference measuring gauge |
| 06/15/2011 | CN102094629A Holder of ferromagnetic memory sensor for logging instruments |
| 06/15/2011 | CN102094628A LaBr3(Ce) crystal-based multi-channel gamma energy spectrum logging instrument |
| 06/15/2011 | CN102094627A Well-head hydraulic signal generating device and operating method thereof |
| 06/15/2011 | CN102094626A Real-time fault early warning method and system of oil well |
| 06/15/2011 | CN102094625A Constant power dual laterolog equipment circuit and control method thereof |
| 06/15/2011 | CN102094624A Power supply circuit of main current for microsphere focused logging |
| 06/15/2011 | CN102094623A Voltage and current measuring circuit of micro-spherically focused logging instrument |
| 06/15/2011 | CN102094622A Thick film circuit of main micro-spherically focused logging current circuit |
| 06/15/2011 | CN102094621A Thick film circuit of voltage and current measuring circuit of micro-spherically focused logging instrument |
| 06/15/2011 | CN102094620A Multi-angle eccentric mechanism for petroleum logging |
| 06/15/2011 | CN102094619A Trap circuit of small signal amplifier for underground engineering parameter test |
| 06/15/2011 | CN102094618A Small signal amplifier for underground engineering parameter test |
| 06/15/2011 | CN102094583A Underground composite cable and mounting device matched therewith |
| 06/15/2011 | CN101324176B Spring self-switching type Y-shaped joint |
| 06/15/2011 | CN101042046B Cased well orientation acoustic logging method |
| 06/14/2011 | US7962288 Multiple distributed force measurements |
| 06/14/2011 | US7960973 Tracking positions of personnel, vehicles, and inanimate objects |
| 06/14/2011 | US7958949 Method and apparatus for three dimensional geosteering |
| 06/14/2011 | US7958937 Process for hydrofracturing an underground aquifer from a water well borehole for increasing water flow production from Denver Basin aquifers |
| 06/14/2011 | US7958936 Downhole formation sampling |
| 06/14/2011 | CA2644575C Well jet device for well-logging operations and the operating method thereof |
| 06/14/2011 | CA2571772C Corrected dts measurements based on raman-stokes signals |
| 06/14/2011 | CA2423661C Method and apparatus for transmitting information to the surface from a drill string down hole in a well |
| 06/14/2011 | CA2404468C Sensor apparatus with two resonant transducers and a single conductor |
| 06/09/2011 | WO2011069167A2 Geotechnical horizontal directional drilling |
| 06/09/2011 | WO2011068848A2 Method for monitoring hydrocarbon production |
| 06/09/2011 | WO2011067606A2 Flow measurements in an oil reservoir |
| 06/09/2011 | WO2011067558A2 Method ans apparatus for in-situ wellbore measurement and control with inductive connectivity |
| 06/09/2011 | WO2011067557A2 Tool service life sensor with wireless connectivity |
| 06/09/2011 | WO2011067556A1 Quartz pressure and temperature transducer assembly with dynamic correction |
| 06/09/2011 | WO2011066624A1 Borehole communication in the presence of a drill string |
| 06/09/2011 | WO2011049691A3 Electrical conduction across interconnected tubulars |
| 06/09/2011 | WO2011019714A3 Methods and apparatus for determination of parameters related to a coiled tubing string |
| 06/09/2011 | US20110135247 Fiber Splice Housing |
| 06/09/2011 | US20110132662 Phase wellbore steering |
| 06/09/2011 | US20110132601 Multi-zone formation evaluation systems and methods |
| 06/09/2011 | CA2782635A1 Quartz pressure and temperature transducer assembly with dynamic correction |
| 06/09/2011 | CA2782618A1 Method and apparatus for in-situ wellbore measurement and control with inductive connectivity |
| 06/09/2011 | CA2782591A1 Method for monitoring hydrocarbon production |
| 06/09/2011 | CA2782426A1 Geotechnical horizontal directional drilling |
| 06/09/2011 | CA2779807A1 Flow measurements in an oil reservoir |
| 06/08/2011 | EP2329300A1 Method and system of an electromagnetic telemetry repeater |
| 06/08/2011 | EP2329111A1 Novel tracer materials |
| 06/08/2011 | EP2329110A1 Method and system for producing hydrocarbon fluid through a well with a sensor assembly outside the well casing |
| 06/08/2011 | EP2329101A1 Optical sensing system for wellhead equipment |
| 06/08/2011 | CN201859532U Key data storage and USB export device of coal mining machine |
| 06/08/2011 | CN201857960U Device for directly measuring content of gas |
| 06/08/2011 | CN201857958U Six-arm borehole diameter logger |
| 06/08/2011 | CN201857957U Downhole pressure gauge for annular space separated layer measurement of production wells |
| 06/08/2011 | CN201857956U Setting and unsetting control module for electric control storage type monolayer pressure measuring instrument |
| 06/08/2011 | CN201857955U Multiplexing type active hole-sealing pressure measuring device |
| 06/08/2011 | CN201857954U Twelve-arm dual sidewall contact device used for micro-resistivity scanning, imaging and logging instrument |
| 06/08/2011 | CN201857953U Advanced abutment pressure monitoring device on coal face |
| 06/08/2011 | CN201857952U Underground electromagnetic detecting instrument |
| 06/08/2011 | CN201857951U Multiple oil wells continuous measurement system based on programmable controller |
| 06/08/2011 | CN201857945U Direct-reading type double-flow water quantity adjusting device |
| 06/08/2011 | CN201857940U Intelligent intermittent oil pumping unit provided with frequency-conversion control device |
| 06/08/2011 | CN201857894U Improved hydraulic percussion drill |
| 06/08/2011 | CN1970990B Method for measuring return flow in petroleum drilling and device therefor |
| 06/08/2011 | CN1782320B Method and system for precise drilling guidance of twin wells |
| 06/08/2011 | CN1671944B Installation and use of removable heaters in a hydrocarbon containing formation |
| 06/08/2011 | CN102089496A Location of bypassed hydrocarbons |
| 06/08/2011 | CN102086763A Well diameter probe |
| 06/08/2011 | CN102086762A Portable digital control logging instrument |
| 06/08/2011 | CN102086755A Continuous oil pipe-based guide high-pressure jet drilling system |
| 06/08/2011 | CN101270646B Water injection well down-hole water sound intelligent control regulating and measuring system |
| 06/07/2011 | USRE42426 Apparatus and method for transmitting information to and communicating with a downhole device |
| 06/07/2011 | US7956614 Flux plane locating in an underground drilling system |
| 06/07/2011 | US7956605 Apparatus detecting relative body movement |
| 06/07/2011 | US7954560 Fiber optic sensors in MWD Applications |
| 06/07/2011 | US7954559 Method for optimizing the location of a secondary cutting structure component in a drill string |
| 06/03/2011 | WO2011066525A2 Apparatus and method for treating a subterranean formation using diversion |