Alexander F Zazovsky

US Patent:

7031841, Apr 18, 2006

Filed:

Jan 30, 2004

Appl. No.:

10/769014

Inventors:

Alexander Zazovsky - Houston TX, US
Julian J. Pop - Houston TX, US
Paul S. Hammond - Cambridge, GB

Assignee:

Schlumberger Technology Corporation - Sugar Land TX

International Classification:

E21B 49/10

US Classification:

702 12, 702 9, 7315205, 7315222, 175 48, 175 50, 16625002, 16625007, 16625008

Abstract:

A method for determining formation pressure at a depth region of formations surrounding a borehole, including: keeping track of the time since cessation of drilling at the depth region; deriving formation permeability at the depth region; causing wellbore pressure to vary periodically in time and determining, at the depth region, the periodic and non-periodic component of pressure measured in the formations; determining, using the time, the periodic component and the permeability, the formation pressure diffusivity and transmissibility and an estimate of the size of the pressure build-up zone around the wellbore at the depth region; determining, using the time, the formation pressure diffusivity and transmissibility, and the non-periodic component, the leak-off rate of the mudcake at the depth region; determining, using the leak-off rate, the pressure gradient at the depth region; and extrapolating, using the pressure gradient and the size of the build-up zone, to determine the formation pressure.

US Patent:

7062959, Jun 20, 2006

Filed:

Dec 19, 2002

Appl. No.:

10/248124

Inventors:

Andrew L. Kurkjian - Sugar Land TX, US
Jean-Marc Follini - Houston TX, US
Patrick J. Fisseler - Missouri City TX, US
Alexander Zazovsky - Houston TX, US

Assignee:

Schlumberger Technology Corporation - Sugar Land TX

International Classification:

E21B 44/00
E21B 47/12

US Classification:

7315246, 7315203

Abstract:

A method and apparatus is provided to determine downhole pressures, such as annular pressure and/or pore pressure, during a drilling operation. A downhole drilling tool includes at least one conduit and a corresponding gauge. The conduit is positioned in the downhole tool and has an opening adapted to receive downhole fluids. The conduit is positionable in fluid communication with one of the wellbore and the formation whereby pressure is equalized therebetween. The gauge is provided for measuring the pressure in the conduit.

US Patent:

7185699, Mar 6, 2007

Filed:

May 25, 2004

Appl. No.:

10/709730

Inventors:

Alexander Zazovsky - Houston TX, US
Jian Zhou - Sugar Land TX, US
Christopher Del Campo - Houston TX, US
Golchehreh Salamat - Sugar Land TX, US
Diankui Fu - Missouri City TX, US
Jese C. Lee - Sugar Land TX, US

Assignee:

Schlumberger Technology Corporation - Sugar Land TX

International Classification:

E21B 41/00
C10M 107/32

US Classification:

1662441, 166902, 508579

Abstract:

A composition for use in an oil chamber of a tool includes a hydraulic oil; and a surfactant, wherein the surfactant is present at an amount sufficient to form micelles in the hydraulic oil. The composition may further include an amphiphilic copolymer. A method includes providing a hydraulic fluid composition comprising a hydraulic oil and a surfactant capable of forming micelles in the hydraulic oil; and filling a hydraulic chamber in the tool with the hydraulic fluid composition. The hydraulic fluid composition may further include an amphiphilic copolymer.

US Patent:

7331223, Feb 19, 2008

Filed:

Jan 27, 2003

Appl. No.:

10/248535

Inventors:

Alexander Zazovsky - Houston TX, US

Assignee:

Schlumberger Technology Corporation - Sugar Land TX

International Classification:

E21B 47/06

US Classification:

7315251

Abstract:

A method and apparatus for measuring the pressure of a formation penetrated by a wellbore is provided. A downhole tool is positioned in the wellbore and a probe is extended therefrom into sealing engagement with the formation. A piston in the probe is retracted therein where by a cavity is defined for receiving a fluid from the formation. A pressure underbalance in the cavity draws fluid from the formation into the cavity. An oscillator may be used to fluctuate the flow of fluid into the cavity. A pressure gauge is used to measure the pressure of fluid in the cavity.

US Patent:

7409992, Aug 12, 2008

Filed:

Jan 11, 2006

Appl. No.:

11/306785

Inventors:

Alexander F. Zazovsky - Houston TX, US
Vadim Akhmadikin - Pearland TX, US
Wenbo Yang - Sugar Land TX, US
Brenden M. Grove - Missouri City TX, US

Assignee:

Schlumberger Technology Corporation - Sugar Land TX

International Classification:

E21B 43/11

US Classification:

166297, 166298, 166 55

Abstract:

The present invention provides an apparatus for use in perforating a well having a plurality of explosive charges. Each explosive charge is adapted to generate a perforation tunnel in the formation adjacent to the well. In one embodiment, explosive charges are oriented to create perforation tunnels that converge at a location within the formation in order to create a fracture initiation plane capable of mitigating or avoiding hydraulic fracturing complications.

US Patent:

7431075, Oct 7, 2008

Filed:

Sep 15, 2005

Appl. No.:

11/162576

Inventors:

James E. Brooks - Manvel TX, US
Philip Kneisl - Pearland TX, US
Alexander F. Zazovsky - Houston TX, US
Mark C. Duhon - Sugar Land TX, US
Alfredo Fayard - Sugar Land TX, US

Assignee:

Schlumberger Technology Corporation - Sugar Land TX

International Classification:

E21B 43/263

US Classification:

166 55, 89 115, 1022755, 1022756

Abstract:

A propellant assembly for fracturing a formation around a well includes a propellant and a detonating cord wrapped around the propellant, the detonating cord to ignite the propellant upon detonation of the detonating cord. Alternatively, the propellant can include a substantially central axial bore, with the propellant having a plurality of axial slots extending radially outwardly from the axial bore toward the outer surface of the propellant. A detonating cord is arranged within the axial bore of the propellant.

US Patent:

7458419, Dec 2, 2008

Filed:

Oct 7, 2004

Appl. No.:

10/960403

Inventors:

Alexander F. Zazovsky - Houston TX, US
Steve Ervin - Brookshire TX, US
Christopher S. Del Campo - Houston TX, US
Stephane Briquet - Houston TX, US

Assignee:

Schlumberger Technology Corporation - Sugar Land TX

International Classification:

E21B 49/10

US Classification:

166100, 166264, 7315226

Abstract:

A probe assembly samples fluid from a wellbore penetrating a subsurface formation having a virgin fluid therein beyond a layer of contaminated fluid surrounding the wellbore. The probe assembly includes a probe body extendable from a downhole tool, and a packer carried by the probe body and having a distal surface adapted for sealingly engaging the wellbore. The packer has an outer and inner periphery, with the inner periphery being defined by a bore through the packer. The packer is further equipped with channel(s) formed in the distal surface and arranged to define an annular cleanup intake intermediate the inner and outer peripheries. The passageway(s) extend(s) through the packer for conducting virgin fluid and/or contaminated fluid between the channel(s). A sampling tube is sealingly disposed in the bore of the packer for conducting virgin fluid to a second inlet in the probe body and the downhole tool.

US Patent:

7484563, Feb 3, 2009

Filed:

Sep 2, 2005

Appl. No.:

11/219244

Inventors:

Alexander F. Zazovsky - Houston TX, US
Christopher S. Del Campo - Houston TX, US
Ricardo Vasques - Sugar Land TX, US

Assignee:

Schlumberger Technology Corporation - Sugar Land TX

International Classification:

E21B 49/08

US Classification:

166264, 166100, 175 59, 7315223

Abstract:

A method of evaluating a fluid from a subterranean formation drawn into a downhole tool positioned in a wellbore penetrating the subterranean formation is provided. The method involves drawing fluid from a formation into an evaluation flowline, drawing fluid from a formation into a cleanup flowline, measuring a property of the fluid in the evaluation flowline and detecting stabilization of the property of the fluid in the evaluation flowline. Fluid properties in a combined flowline may be generated from the evaluation and cleanup flowlines. The fluid properties of the combined flowline may be used to project future evaluation flowline fluid properties. Contamination levels for a given fluid property of a given flowline may also be determined.