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| Number | Title | Issue Date |
| 8117907 | Caliper logging using circumferentially spaced and/or angled transducer elements A downhole tool includes circumferentially spaced and/or angled transducer elements. In one embodiment a standoff sensor has at least three piezoelectric transducer elements, at least a first element of which is configured to both transmit and receive ultrasonic ene... | 02/21/2012 |
| 7571643 | Apparatus and method for downhole dynamics measurements Aspects of this invention include a rotary steerable steering tool having a sensor arrangement for measuring downhole dynamic conditions. Rotary steerable tools in accordance with this invention include a rotation rate measurement device disposed to measure a differ... | 08/11/2009 |
| 7513147 | Piezocomposite transducer for a downhole measurement tool An acoustic sensor for use in a downhole measurement tool includes a piezo-composite transducer element. In various exemplary embodiments, the acoustic sensor further includes a composite backing layer, at least one matching layer, and a barrier layer deployed at an... | 04/07/2009 |
| 7489591 | Drilling fluid pressure pulse detection using a differential transducer An apparatus for detecting mud pulse telemetry signals includes a differential transducer. In various exemplary embodiments, a high-pressure side of the differential transducer is in fluid communication with either drilling fluid in a standpipe (which is in fluid co... | 02/10/2009 |
| 7482812 | Series-resonant tuning of an LWD receiver A loop antenna useful, for example, in investigation of earth formations. Embodiments of the invention provide a loop antenna circuit comprising a loop antenna disposed to generate, in response to an electromagnetic wave, a pick-up signal on an output node. Loop ant... | 01/27/2009 |
| 7464770 | Closed-loop control of hydraulic pressure in a downhole steering tool Aspects of this invention include a steering tool having a controller configured to provide closed-loop control of hydraulic fluid pressure. In one exemplary embodiment, closed-loop control of a system (reservoir) pressure may be provided. In another embodiment, clo... | 12/16/2008 |
| 7436184 | Well logging apparatus for obtaining azimuthally sensitive formation resistivity measurements An apparatus for making azimuthally sensitive resistivity measurements of a subterranean formation is disclosed. The apparatus includes a magnetically permeably ring deployed about an electrically conductive tool body. An AC voltage supply is coupled to the tool bod... | 10/14/2008 |
| 7426967 | Rotary steerable tool including drill string rotation measurement apparatus Aspects of this invention include a downhole tool (such as a steering tool) including first and second sensor sets for measuring substantially instantaneous drill string rotation rates. Each of the sensor sets includes at least one accelerometer disposed to measure ... | 09/23/2008 |
| 7414405 | Measurement tool for obtaining tool face on a rotating drill collar An apparatus for obtaining tool face angles on a rotating drill collar in substantially real time is disclosed. In one exemplary embodiment the apparatus includes a magnetoresistive magnetic field sensor deployed in a tool body. The apparatus further includes a prog... | 08/19/2008 |
| 7403857 | Enhanced measurement of azimuthal dependence of subterranean parameters with filters and/or discretely sampled data A method for estimating an azimuthal dependence of a parameter of a borehole using logging sensor measurements acquired as a function of azimuth of the logging sensors is provided. The method includes acquiring at least one logging sensor measurement and a correspon... | 07/22/2008 |
| 7388379 | Series-resonant tuning of a downhole loop antenna A loop antenna useful, for example, in investigation of earth formations. Embodiments of the invention provide a loop antenna circuit comprising a loop antenna disposed to generate, in response to an electromagnetic wave, a pick-up signal on an output node. Loop ant... | 06/17/2008 |
| 7385400 | Azimuthally sensitive receiver array for an electromagnetic measurement tool An azimuthally sensitive logging while drilling tool is disclosed. The tool may be suitable, for example, to measure azimuthal variations of electrical properties of a subterranean formation. The tool includes at least one transmitter disposed to transmit electromag... | 06/10/2008 |
| 7383897 | Downhole steering tool having a non-rotating bendable section A downhole steering tool is disclosed. The steering tool includes a rotatable shaft, a substantially non-rotating tool body deployed about the shaft, and a plurality of force application members deployed on the steering tool body. The steering tool further includes ... | 06/10/2008 |
| 7377333 | Linear position sensor for downhole tools and method of use Aspects of this invention include a downhole tool having first and second members disposed to translate substantially linearly with respect to one another. A magnet is deployed on the first member and a plurality of magnetic field sensors is deployed on the second m... | 05/27/2008 |
| 7363159 | Method of determining resistivity and/or dielectric values of an earth formation as a function of position within the earth formation A technique of estimating electrical parameters of an earth formation accounts for spatial inhomogeneities and frequency dispersion. The results are achieved using a model which is evaluated to generate predicted values for a plurality of electrical signals measured... | 04/22/2008 |
| 7327145 | Azimuthally focused electromagnetic measurement tool An azimuthally sensitive electromagnetic measurement tool is provided. The tool may be suitable, for example, to measure azimuthal variations of electrical properties of a subterranean formation. The tool includes a transmitter disposed to transmit electromagnetic e... | 02/05/2008 |
| 7260479 | Method for locating casing joints using measurement while drilling tool A method for locating casing string joints using a measurement while drilling tool is disclosed. The method includes deploying an MWD tool in a wellbore and measuring the magnetic field along a length of the wellbore. Changes in the magnetic field along the length o... | 08/21/2007 |
| 7260477 | Estimation of borehole geometry parameters and lateral tool displacements A method for determining a borehole geometry parameter vector and/or lateral tool displacement vectors in a borehole is provided. The method includes acquiring at least one set of standoff measurements at a corresponding time. The method also includes processing a s... | 08/21/2007 |
| 7245229 | Drill string rotation encoding A method for communicating with a downhole device is provided. The method includes predefining an encoding language including codes understandable to the device, the codes represented in the language as predefined value combinations of drill string rotation variable... | 07/17/2007 |
| 7243740 | Filter assembly having a bypass passageway and method A filter assembly including a primary flow passageway having at least one filter deployed therein and a secondary flow passageway having a bypass filter deployed therein is provided. The filter assembly further includes a bypass valve assembly configured to selectiv... | 07/17/2007 |
| 7243719 | Control method for downhole steering tool A method for determining a rate of change of longitudinal direction of a subterranean borehole is provided. The method includes positioning a downhole tool in a borehole, the tool including first and second surveying devices disposed thereon. The method further incl... | 07/17/2007 |
| 7222681 | Programming method for controlling a downhole steering tool A method for communicating with a downhole tool located in a subterranean borehole is disclosed. Exemplary embodiments of the method include encoding data and/or commands in a sequence of varying drill string rotation rates and drilling fluid flow rates. The varying... | 05/29/2007 |
| 7204325 | Spring mechanism for downhole steering tool blades A steering tool for use in a well bore is disclosed. The tool includes at least one extendable and retractable blade deployed thereon. The blade is elastically spring biased radially inwards towards the tool such that upon removal of an actuating force, the blade re... | 04/17/2007 |
| 7080460 | Determining a borehole azimuth from tool face measurements A method for surveying a subterranean borehole is provided. The method includes determining tool face angles at first and second longitudinal positions in the borehole. The method further includes processing the tool face angles to determine a change in borehole azi... | 07/25/2006 |
| 6591195 | Method of and apparatus for independently determining the resistivity and/or dielectric constant of an earth formation Techniques are provided to transform attenuation and phase measurements taken in conjunction with a drilling operation into independent electrical parameters such as electrical resistivity and dielectric values. The electrical parameters are correlated wi... | 07/08/2003 |
