| Patent Number |
Title Of Patent |
Date Issued |
| 8118114 |
Closed-loop control of rotary steerable blades |
February 21, 2012 |
| A steering tool has a controller configured to provide closed-loop control of blade pressure and position. In one embodiment, the controller is configured to execute a directional control methodology in which the drilling direction is controlled via control of the blade position. The |
| 8102276 |
Non-contact capacitive datalink for a downhole assembly |
January 24, 2012 |
| Aspects of this invention include a downhole assembly having a non-contact, capacitive coupling including first and second transceivers deployed in corresponding first and second downhole tool members. The capacitive coupling is disposed to transfer electrical signals between the fir |
| 7967081 |
Closed-loop physical caliper measurements and directional drilling method |
June 28, 2011 |
| Aspects of this invention include a downhole tool and method for making a physical caliper measurement of a subterranean borehole. The tool is configured to make the physical borehole caliper measurement only when the measured pressure in each of three or more outwardly extendable bl |
| 7950473 |
Non-azimuthal and azimuthal formation evaluation measurement in a slowly rotating housing |
May 31, 2011 |
| A steering tool configured for making azimuthal and non-azimuthal formation evaluation measurements is disclosed. In one embodiment a rotary steerable tool includes at least one formation evaluation sensor deployed in the steering tool housing. The steering tool may include, for exam |
| 7725263 |
Gravity azimuth measurement at a non-rotating housing |
May 25, 2010 |
| Aspects of this invention include methods for surveying a subterranean borehole. In one exemplary aspect, a change in borehole azimuth between first and second longitudinally spaced gravity measurement sensors may be determined directly from gravity measurements made by the sensors and a |
| 7571643 |
Apparatus and method for downhole dynamics measurements |
August 11, 2009 |
| 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 difference in rotation rates |
| 7558675 |
Probablistic imaging with azimuthally sensitive MWD/LWD sensors |
July 7, 2009 |
| A method for forming a borehole image of an azimuthally sensitive borehole or formation parameter is disclosed. Such a borehole image may be formed, for example, by processing logging sensor data with a predetermined sensor response function (also referred to herein as a probability |
| 7464770 |
Closed-loop control of hydraulic pressure in a downhole steering tool |
December 16, 2008 |
| 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, closed-loop control of a |
| 7426967 |
Rotary steerable tool including drill string rotation measurement apparatus |
September 23, 2008 |
| 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 cross-axial accele |
| 7377333 |
Linear position sensor for downhole tools and method of use |
May 27, 2008 |
| 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 member. The magnetic |
| 7222681 |
Programming method for controlling a downhole steering tool |
May 29, 2007 |
| 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 rotation rates an |
