| Patents for E21B 47 - Survey of boreholes or wells (31,352) |
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| 11/01/2001 | US20010036667 Reservoir monitoring |
| 11/01/2001 | US20010035312 Acoustic sensor for fluid characterization |
| 11/01/2001 | US20010035288 Inductively coupled method and apparatus of communicating with wellbore equipment |
| 11/01/2001 | US20010035057 Apparatus for passive removal of subsurface contaminants and mass flow measurement |
| 10/31/2001 | EP1149312A1 High-power well logging method and apparatus |
| 10/31/2001 | EP1149228A1 Apparatus for measuring downhole drilling efficiency parameters |
| 10/31/2001 | EP1149227A1 Method and rock drilling apparatus for controlling rock drilling |
| 10/31/2001 | CN2457341Y Releasing and recovering device for logging instrument |
| 10/30/2001 | US6310829 Method and apparatus for improved communication in a wellbore utilizing acoustic signals |
| 10/30/2001 | US6310559 Monitoring performance of downhole equipment |
| 10/30/2001 | US6308788 Conductive medium for openhole logging and logging while drilling |
| 10/30/2001 | US6308787 Real-time control system and method for controlling an underground boring machine |
| 10/30/2001 | US6308563 Vadose zone isobaric well |
| 10/30/2001 | US6308562 Technique for signal detection using adaptive filtering in mud pulse telemetry |
| 10/30/2001 | US6308561 Well logging apparatus |
| 10/25/2001 | WO2001079891A1 Probe for detecting the structure of a dielectric medium |
| 10/25/2001 | WO2001021927A3 Real-time control system and method for controlling an underground boring machine |
| 10/25/2001 | US20010033164 Focused through-casing resistivity measurement |
| 10/25/2001 | US20010032721 Method for boosting the output voltage of a variable frequency drive |
| 10/24/2001 | EP1147283A1 Multilateral well and electrical transmission system |
| 10/24/2001 | CN2455934Y Multi-parameter comprehensive logging instrument |
| 10/24/2001 | CN2455933Y 阻流器 Spoiler |
| 10/24/2001 | CN2455932Y Program controlled valve for determining downhole water layer and oil layer |
| 10/24/2001 | CN1319158A Through-drill string conveyed logging system |
| 10/23/2001 | US6307199 Compensation of errors in logging-while-drilling density measurements |
| 10/23/2001 | US6305944 Electrical connector |
| 10/23/2001 | US6305474 Scoop for use with an anchor system for supporting a whipstock |
| 10/23/2001 | US6305467 Wireless coiled tubing joint locator |
| 10/23/2001 | US6305227 Sensing systems using quartz sensors and fiber optics |
| 10/23/2001 | US6305216 Method and apparatus for predicting the fluid characteristics in a well hole |
| 10/23/2001 | CA2102956C Acoustic system and method for performing operations in a well |
| 10/18/2001 | WO2001077485A1 Downhole flow meter |
| 10/18/2001 | US20010030076 Receiver array using tubing conveyed packer elements |
| 10/18/2001 | US20010030047 Auto-extending/retracting electrically isolated conductors in a segmented drill string |
| 10/18/2001 | US20010029780 Logging device data dump probe |
| 10/17/2001 | EP1144804A1 Method for detecting inflow of fluid in a well while drilling and implementing device |
| 10/17/2001 | CN2454540Y Tube-colume for seanching leakage area |
| 10/17/2001 | CN2454539Y Apparatus for measuring casing-pressure of water well |
| 10/16/2001 | US6302215 Positioning and conveying well apparatus and method |
| 10/16/2001 | US6302205 Method for locating a drill bit when drilling out cementing equipment from a wellbore |
| 10/16/2001 | US6302204 Method of obtaining improved geophysical information about earth formations |
| 10/16/2001 | US6302203 Apparatus and method for communicating with devices positioned outside a liner in a wellbore |
| 10/16/2001 | CA2181304C Method of detecting changes in the rate of discharge of fluid from a wellbore |
| 10/11/2001 | WO2001075403A1 Method and apparatus for flow measurement |
| 10/11/2001 | WO2001075268A1 Method for estimating the position of a drill |
| 10/11/2001 | US20010027879 Combined logging and drilling system |
| 10/11/2001 | US20010027866 Deviated borehole drilling assembly |
| 10/11/2001 | US20010027865 Non-intrusive pressure measurement device for subsea well casing annuli |
| 10/10/2001 | EP1143105A1 Directional drilling system |
| 10/10/2001 | CN2453135Y Oil well perforating gun tail sounding device |
| 10/10/2001 | CN1317070A Downhole well corrosion monitoring apparatus and method |
| 10/09/2001 | US6300762 Use of polyaryletherketone-type thermoplastics in a production well |
| 10/09/2001 | US6298915 Orienting system for modular guns |
| 10/09/2001 | CA2203402C Single-wire guidance system for drilling boreholes |
| 10/09/2001 | CA2155918C Integrated well drilling and evaluation |
| 10/04/2001 | WO2001073424A1 Method and apparatus for the down-hole characterization of formation fluids |
| 10/04/2001 | WO2001073423A1 Apparatus and method for downhole well equipment and process management, identification, and actuation |
| 10/04/2001 | WO2001073400A1 Method and apparatus for determining fluid viscosity |
| 10/04/2001 | WO2001073380A1 Sensor apparatus with two resonant transducers and a single conductor |
| 10/04/2001 | WO2001073264A1 Monitoring fluid flow through a filter |
| 10/04/2001 | WO2001021928A3 High data rate acoustic telemetry system |
| 10/04/2001 | US20010025710 Method and apparatus for connecting a main well bore and a lateral branch |
| 10/04/2001 | EP0656127B1 Reduced diameter down-hole instrument cable |
| 10/04/2001 | CA2342594A1 Variable gauge stabilizer for directional drilling |
| 10/03/2001 | CN2451735Y Capillary down-hole pressure monitoring transmitter |
| 10/02/2001 | US6297638 Method for controlling cable boring |
| 10/02/2001 | US6296066 Well system |
| 10/02/2001 | US6296056 Subsurface measurement apparatus, system, and process for improved well drilling, control, and production |
| 10/02/2001 | CA2081012C Device for measuring drilling mast swivel movement |
| 10/02/2001 | CA2024061C System for drilling deviated boreholes |
| 09/27/2001 | WO2001071388A1 Flux orientation locating in a drilling system |
| 09/27/2001 | WO2001071155A1 Communicating with devices positioned outside a liner in a wellbore |
| 09/27/2001 | WO2001071149A2 Drill bit stabilizer and method of use |
| 09/27/2001 | WO2001020126A3 System for enhancing fluid flow in a well |
| 09/27/2001 | US20010023614 Monitoring of downhole parameters and tools utilizing fiber optics |
| 09/27/2001 | CA2403727A1 Drill bit stabilizer and method of use |
| 09/26/2001 | CN2450381Y Gate type circulating head |
| 09/26/2001 | CN1314968A Directional drilling system and apparatus |
| 09/20/2001 | WO2001069040A1 Acoustic sensor for fluid characterization |
| 09/20/2001 | WO2001018357B1 Methods and associated apparatus for downhole data retrieval, monitoring and tool actuation |
| 09/20/2001 | US20010022241 Bottomhole assembly and methods of use |
| 09/20/2001 | US20010022239 Establishing positions of locating field detectors and path mapping in underground boring tool applications |
| 09/20/2001 | CA2334525A1 A downhole tool including an electrically steerable antenna for use with a formation deployed remote sensing unit |
| 09/19/2001 | EP0900321A4 Pad production log tool |
| 09/19/2001 | CN2448924Y Downhole autoamtic control liquid sampling valve |
| 09/19/2001 | CN2448923Y Magnet positioning digital hole depth measurer integrally connected with hoist |
| 09/19/2001 | CN2448922Y Sealed flow collector for annular water detector |
| 09/18/2001 | US6289999 Fluid flow control devices and methods for selective actuation of valves and hydraulic drilling tools |
| 09/18/2001 | US6289985 System intended for permanent installation of measuring sondes against the inner wall of a pipe |
| 09/18/2001 | US6289596 Downhole tool |
| 09/18/2001 | CA2183113C Well test imaging |
| 09/13/2001 | WO2001067466A1 In-well monitoring and flow control system |
| 09/13/2001 | WO2001066912A1 Method and apparatus enhanced acoustic mud pulse telemetry |
| 09/13/2001 | WO2001066911A1 Method and apparatus for enhanced acoustic mud pulse telemetry during underbalanced drilling |
| 09/13/2001 | WO2001066900A2 Method and apparatus for directional boring under mixed conditions |
| 09/13/2001 | US20010021347 Pumpjack dynamometer and method |
| 09/13/2001 | US20010020675 Wellbores utilizing fiber optic-based sensors and operating devices |
| 09/13/2001 | DE10007647A1 Data transmission method for borehole uses pressure modulation of rinsing fluid flow between pump and borehole drilling or widening head |
| 09/12/2001 | EP1131535A2 Method and system for accessing subterranean deposits from the surface |
| 09/12/2001 | EP1131534A2 Azimuth control of hydraulic vertical fractures in unconsolidated and weakly cemented soils and sediments |