Sofia Nikolaevna Davydycheva

US Patent:

7138897, Nov 21, 2006

Filed:

Sep 9, 2004

Appl. No.:

10/711309

Inventors:

Gerald Minerbo - Missouri City TX, US
Sofia Davydycheva - Sugar Land TX, US
Hanming Wang - Sugar Land TX, US
Dean M. Homan - Sugar Land TX, US

Assignee:

Schlumberger Technology Corporation - Sugar Land TX

International Classification:

H01F 27/02

US Classification:

336 90, 324339

Abstract:

An induction tool includes a conductive mandrel; at least one array including a transmitter, a bucking coil, and a receiver disposed in an insulating tool body surrounding the conductive mandrel; and an electrode disposed on the insulating tool body at a selected location between the bucking coil and the receiver, wherein the selected location is spaced from the transmitter at a distance corresponding approximately to the harmonic mean of the distance between the transmitter and the bucking coil and the distance between the transmitter and the receiver, and wherein the electrode includes a contact forming a conductive path to the conductive mandrel. Additional electrodes may be disposed above and below each transmitter and receiver coil to reduce sensitivity to eccentricity of the tool in the borehole.

US Patent:

7386430, Jun 10, 2008

Filed:

Mar 19, 2004

Appl. No.:

10/708719

Inventors:

Thomas D. Barber - Houston TX, US
Tracy E. Broussard - Houston TX, US
Gerald N. Minerbo - Missouri City TX, US
Hanming Wang - Sugar Land TX, US
Sofia Davydycheva - Sugar Land TX, US

Assignee:

Schlumberger Technology Corporation - Sugar Land TX

International Classification:

G06G 7/48
G01V 3/18
E21B 49/00

US Classification:

703 10, 703 6, 324339, 702 6, 702 7, 7315206

Abstract:

A method for modeling borehole effects of a transverse array induction tool includes selecting a formation-borehole model having a set of parameters, wherein the set of parameters comprises a direction of tool eccentering; determining initial values for the set of parameters; computing expected responses for a selected set of arrays from the plurality of arrays of the induction tool, wherein the computing is based on the formation-borehole model; comparing the expected responses with actual responses for the selected set of arrays; adjusting values of the set of parameters, if a difference between the expected responses and the actual responses is no less than a predetermined criterion; repeating the computing, the comparing, and the adjusting, until the difference between the expected responses and the actual responses is less than the predetermined criterion; determining the borehole effects from final values of the set of parameters.

US Patent:

8200437, Jun 12, 2012

Filed:

Sep 30, 2008

Appl. No.:

12/241141

Inventors:

Sofia Davydycheva - Sugar Land TX, US
Dean Homan - Sugar Land TX, US
Dzevat Omeragic - Lexington MA, US

Assignee:

Schlumberger Technology Corporation - Sugar Land TX

International Classification:

G01V 3/18

US Classification:

702 7, 702 6, 324339

Abstract:

A method for determining electromagnetic induction properties of subsurface rock formations includes determining an eccentering angle of a well logging instrument disposed in a wellbore. The instrument includes at least one triaxial induction transmitter and at least one triaxial induction receiver. The eccentering angle is determined from symmetric cross component measurement differences. The triaxial induction measurements made from the at least one receiver are rotated to an apparent eccentering angle of zero. At least one electromagnetic induction property is determined from the rotated triaxial induction measurements.

US Patent:

8294467, Oct 23, 2012

Filed:

Sep 21, 2009

Appl. No.:

12/563569

Inventors:

Gerald Minerbo - Missouri City TX, US
Sofia Davydycheva - Sugar Land TX, US
Jian Yang - Sugar Land TX, US

Assignee:

Schlumberger Technology Corporation - Sugar Land TX

International Classification:

G01V 3/10
G01V 3/18

US Classification:

324343

Abstract:

The present disclosure relates to a method to produce an image of a subsurface formation using directional measurements. A downhole logging tool having one or more transmitters and one or more receivers, and being capable of making directional measurements, is used to measure the voltage in a particular receiver due to a particular transmitter for one or more transmitter/receiver pairs, at least one of those voltage measurements being a directional measurement. The complex (phasor) voltage recorded on a receiver coil is divided by the complex voltage recorded at another reference receiver coil. Alternatively, we can use the ratio of a receiver voltage at a particular rotation angle of the tool divided by the voltage on the same receiver when the tool has rotated by an angle of 180 degrees. The information in those ratios is combined to produce images of the resistivity of the subsurface formation surrounding the tool.

US Patent:

20050083064, Apr 21, 2005

Filed:

Sep 25, 2003

Appl. No.:

10/605375

Inventors:

Dean Homan - SUGAR LAND TX, US
Gerald Minerbo - MISSOURI CITY TX, US
Sofia Davydycheva - SUGAR LAND TX, US

Assignee:

SCHLUMBERGER TECHNOLOGY CORPORATION - Sugar Land TX

International Classification:

G01V003/00
E21B047/00

US Classification:

324347000, 166065100

Abstract:

A composite shell adapted to cover a source or sensor, particularly for subsurface applications. The shell provides transparency to the passage of signals to or from the source or sensor. The shell is adapted with a uniform semi-conductive surface providing a path for electric currents flowing within a subsurface borehole to short near the source or sensor.

US Patent:

20110320125, Dec 29, 2011

Filed:

Mar 25, 2009

Appl. No.:

13/133973

Inventors:

Ekaterina Rykhlinkskaya - Heidelberg, DE
Sofia Davydycheva - Sugar Land TX, US

International Classification:

G06F 19/00

US Classification:

702 5

Abstract:

SUBSTANCE: Invention relates to marine geoelectrical exploration using controlled artificial sources of electromagnetic field. Using a dipole source, an electromagnetic field is generated inside the analysed medium by sending rectangular electric pulses with intervals in between into the medium. Geometrical probing is done along the profile during the current pulse, and probing on transient processes is done during the interval. Measurements are taken using measuring apparatus mounted on the seafloor, consisting of five electrodes: a central electrode with four others around it on corners of a square, two opposite sides of which are parallel to the axis of the profile. During the current flow period and intervals between current pulses, the second electric potential difference between external electrodes and the central electrode, as well as the first electric potential difference between three pairs of external electrodes is measured. When the dipole source passes through different points, there is provision for equipotentiality of a closed line passing through four external electrodes of the measuring apparatus thereby eliminating the horizontal component of current density in each probing point inside this line. Values of the measured electric potential differences are used to calculate three sets of standard interpreted electrical parameters which are not subject to lateral effect of three-dimensional geological non-uniformities located outside the probing point. Using the derived parameters, the model of the medium is found and time sections of this model is constructed on electroconductivity of elements of the medium, induced polarization coefficient and decay time constant of induced polarization potential differences. EFFECT: elimination of distorting lateral effect on probing results, which allows for deep sea delineation of hydrocarbon accumulation with high contrast.

US Patent:

20120232797, Sep 13, 2012

Filed:

Mar 8, 2012

Appl. No.:

13/415348

Inventors:

Michael Frenkel - Houston TX, US
Sofia Davydycheva - Houston TX, US

International Classification:

G06F 19/00
G01V 3/12
G06F 17/18
G01V 9/00

US Classification:

702 2, 702179, 702 6, 702 13

Abstract:

A method for detecting a subterranean anomaly is provided. The method includes receiving signal data derived from a plurality of transmitters and at least one receiver; calculating a relationship for selected combinations of measurements provided by the signal data; estimating weighting factors for each transmitter, for a condition where there is a substantially equivalent potential across each of the transmitters; applying the weighting factors to the data; and identifying the anomaly in weighted data. Apparatus are also provided.

US Patent:

20130027044, Jan 31, 2013

Filed:

Sep 19, 2012

Appl. No.:

13/622905

Inventors:

Gerald Minerbo - Missouri City TX, US
Sofia Davydycheva - Sugar Land TX, US
Jian Yang - Sugar Land TX, US

International Classification:

G01V 3/18
G01V 3/28

US Classification:

324343, 324338

Abstract:

The present disclosure relates to a method to produce an image of a subsurface formation using directional measurements. A downhole logging tool having one or more transmitters and one or more receivers, and being capable of making directional measurement, is used to measure the voltage in a particular receiver due to a particular transmitter for one or more transmitter/receiver pairs, at least one of those voltage measurements being a directional measurement. The complex (phasor) voltage recorded on a receiver coil is divided by the complex voltage recorded at another reference receiver coil. Alternatively, we can use the ratio of a receiver voltage at a particular rotation angle of the tool divided by the voltage on the same receiver when the tool has rotated by an angle of 180 degrees. The information in those ratios is combined to produce images of the resistivity of the subsurface formation surrounding the tool.