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| Number | Title | Issue Date |
| 7388382 | System for measuring Earth formation resistivity through an electrically conductive wellbore casing An instrument is disclosed for measuring resistivity of Earth formations from within a conductive pipe inside a wellbore drilled through the formations. The instrument includes a plurality of housings connected end to end and adapted to traverse the wellbore. At lea... | 06/17/2008 |
| 7315256 | Magnetic signalling in pipelines Method systems and apparatus for signalling within pipelines. The systems methods and apparatus make use of a unit locatable within a tubular piece of metallic structure for the transmission and/or reception of signals. The unit includes a magnetic material core ( | 01/01/2008 |
| 7272503 | Method and apparatus for measuring formation conductivities from within cased wellbores by combined measurement of casing current leakage and electromagnetic response A method for determining spatial distribution of resistivity of Earth formations surrounding a wellbore having a conductive pipe therein includes measuring resistivity of the Earth formations using measurements of current leakage along the pipe at selected axial pos... | 09/18/2007 |
| 7268696 | Directional signal and noise sensors for borehole electromagnetic telemetry system An electromagnetic borehole telemetry system providing improved signal to noise ratio. Adaptive filters use noise channels as references to remove noise from the signal channel. Directional detectors provide a signal channel with reduced noise content and improved n... | 09/11/2007 |
| 7202671 | Method and apparatus for measuring formation conductivities from within cased wellbores by combined measurement of casing current leakage and electromagnetic response A method is disclosed for determining spatial distribution of resistivity of Earth formations surrounding a wellbore having a conductive pipe therein. The method includes measuring resistivity of the Earth formations using measurements of current leakage along the p... | 04/10/2007 |
| 7150188 | Non-invasive measurement of fluid-pressure diffusivity using electro-osmosis An apparatus for determining fluid-pressure diffusivity in a borehole (12) in a formation (10) includes an electrode (16) and a strain measuring device (18),(20) (or a particle velocity measuring device (18),(20) or a... | 12/19/2006 |
| 7073609 | Apparatus and methods for imaging wells drilled with oil-based muds A resistivity logging sensor for logging while drilling a well using an oil-based mud includes a sensor body; a first current injector electrode disposed on the sensor body, wherein the first current injector electrode is electrically insulated from the sensor body;... | 07/11/2006 |
| 7034538 | Method for measuring earth formation resistivity through an electrically conductive wellbore casing An apparatus is disclosed for measuring formation resistivity through a conductive pipe in a wellbore. The apparatus includes a sonde adapted to be moved through the wellbore, and a plurality of voltage measurement electrodes are disposed on the sonde at spaced apar... | 04/25/2006 |
| 6975121 | System for measuring earth formation resistivity through and electrically conductive wellbore casing An apparatus is disclosed for measuring formation resistivity through a conductive pipe in a wellbore. The apparatus includes a sonde adapted to be moved through the wellbore, and a plurality of voltage measurement electrodes are disposed on the sonde at spaced apar... | 12/13/2005 |
| 6188223 | Electric field borehole telemetry An apparatus for borehole electric field telemetry includes a source of modulated voltage or current, at least one axially extending collar collar connected between pipe sections in a pipe string, and a system of insulated wireline components providing el... | 02/13/2001 |
| 5223794 | Methods of operation of apparatus measuring formation resistivity from within a cased well having one measurement and two compensation steps Methods of operation of an apparatus having at least two pairs of voltage measurement electrodes vertically disposed in a cased well to measure the resistivity of adjacent geological formations from inside the cased well. During stationary measurements wi... | 06/29/1993 |
| 5005406 | Monitoring drilling mud composition using flowing liquid junction electrodes In the rotary drilling of oil wells a drilling mud is used both to transport the cuttings up to the surface and to impose an hydrostatic pressure on the walls of the borehole. For these functions the mud must for example have an acceptable density and vis... | 04/09/1991 |
| 4245313 | Method and apparatus for determining characteristics of subsurface earth formations In accordance with illustrative embodiments of the present invention, measurements of a plurality of earth formation parameters are combined to produce a new parameter representative of characteristics of the formation. This new parameter is then utilized... | 01/13/1981 |
