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Depavia
Luis Depavia, Orinda, CA US
| Patent application number | Description | Published |
|---|---|---|
| 20090217074 | TIME SYNCHRONIZATION IN UNITS AT DIFFERENT LOCATIONS - To synchronize units of a formation evaluation/drilling operation evaluation system, a time delay associated with a communications link between a master unit and a slave unit of the formation evaluation/drilling operation evaluation system is determined. The master unit has a master time clock that provides universal time. The time delay associated with the communications link is used to enable synchronization of time provided by a slave time clock in the slave unit to the universal time. | 08-27-2009 |
| 20100225322 | SYSTEM AND METHOD FOR ELEVATED SOURCE TO BOREHOLE ELECTROMAGNETIC SURVEY - Methods and systems are provided to determine a property of an earth formation, comprising a mobile transmitter disposed at a predetermined elevated height above a surface of the earth formation, and one or more receivers moveably disposed in a wellbore penetrating the earth formation. Electromagnetic energy is transmitted from the mobile transmitter into the formation from a plurality of locations; and at the one or more receivers a signal is measured. Using the signal received by the one or more receivers, a property of the formation, such as resistivity, can be determined and mapped. | 09-09-2010 |
Luis E. Depavia, Orinda, CA US
| Patent application number | Description | Published |
|---|---|---|
| 20090281731 | Characterizing at Least One Property of a Liner that Lines a Well - Impedances of an electromagnetic (EM) coil positioned in a well lined with an electrically conductive liner are determined. The impedances correspond to plural frequencies of operation of the EM coil. Based on the impedances of the EM coil corresponding to the plural frequencies, an attenuation factor associated with the electrically conductive liner is determined. | 11-12-2009 |
Luis E. Depavia, Sugar Land, TX US
| Patent application number | Description | Published |
|---|---|---|
| 20110204896 | DETECTING A STRUCTURE IN A WELL - A tool for detecting a structure in a well includes a receiver coil having a first winding and a second winding, a first circuit to apply an input signal to the second winding, and a detection circuit to detect a response of the first winding to the input signal applied to the second winding. The response of the first winding indicates presence of the structure in the well if the receiver coil is positioned proximate the structure. The depths (or locations) of these structures are used to avoid placing receivers near these structures for EM induction surveys, such as cross-well, surface-to-wellbore, or single-wellbore induction loggings with receivers in metallic casing. | 08-25-2011 |
Luis Eduard Depavia, Orinda, CA US
| Patent application number | Description | Published |
|---|---|---|
| 20100134113 | SINGLE-WELL THROUGH CASING INDUCTION LOGGING TOOL - Methods and related systems are described for making electromagnetic measurements of a subterranean rock formation through a conductive casing of a borehole. A number of transmitters/receivers are deployed into single well having a conductive casing. A magnetic field is induced through the conductive casing and into a surrounding subterranean rock formation, and the magnetic field is detected by the receivers. The receivers have main windings, feedback winding and bucking windings. One of the receiver coils in the tool string is excited at a time, and induced voltages at all of the other receiver coils, either in straight mode, or in feedback mode, are measured. | 06-03-2010 |
Luis Eduardo Depavia, Sugar Land, TX US
| Patent application number | Description | Published |
|---|---|---|
| 20090261832 | ELECTROMAGNETIC-SEISMIC LOGGING SYSTEM AND METHOD - An EMI-Seismic logging tool for use in a subterranean formation penetrated by a well bore, wherein the system makes electromagnetic and seismic measurements simultaneously using an EM receiver array for both measurements. A method of simultaneously making electromagnetic and seismic measurements in a subterranean formation is also provided. | 10-22-2009 |