John Boyce Still

US Patent:

7166560, Jan 23, 2007

Filed:

Oct 27, 2003

Appl. No.:

10/605784

Inventors:

John W. Still - Richmond TX, US
Keith Dismuke - Katy TX, US
Wayne W. Frenier - Katy TX, US

Assignee:

Schlumberger Technology Corporation - Sugarland TX

International Classification:

C09K 8/68
C09K 8/72
C09K 8/74

US Classification:

507219, 507203, 507923, 507933, 1663081, 1663083

Abstract:

An acid fracturing method is provided in which the acid is generated in the fracture by hydrolysis of a solid acid-precursor selected from one or more than one of lactide, glycolide, polylactic acid, polyglycolic acid, a copolymer of polylactic acid and polyglycolic acid, a copolymer of glycolic acid with other hydroxy-, carboxylic acid-, or hydroxycarboxylic acid-containing moieties, and a copolymer of lactic acid with other hydroxy-, carboxylic acid or hydroxycarboxylic acid-containing moieties. The solid acid-precursor may be mixed with a solid acid-reactive material to accelerate the hydrolysis and/or coated to slow the hydrolysis. Water-soluble liquid compounds are also given that accelerate the hydrolysis. The method ensures that the acid contacts fracture faces far from the wellbore.

US Patent:

7431089, Oct 7, 2008

Filed:

Jun 25, 2007

Appl. No.:

11/767579

Inventors:

Isabelle Couillet - Houston TX, US
John W. Still - Richmond TX, US

Assignee:

Schlumberger Technology Corporation - Sugar Land TX

International Classification:

E21B 43/27

US Classification:

166307

Abstract:

In a method of treating a sandstone-containing subterranean formation penetrated by a wellbore, a slurry of a carrier fluid containing a surface modification agent of at least one of a hydrolyzable organosilicon compound, a phosphonate compound or a combination of these is formed. The slurry is introduced into the wellbore at or above the fracture pressure of the formation. A sandstone-dissolving material is introduced into the wellbore with or subsequent to introduction of the slurry. The surface modification agent may be encapsulated within an encapsulating material. A composition for use in treating sandstone-containing subterranean formations is also provided. The composition includes an aqueous carrier fluid containing an encapsulated surface modification agent of at least one of a hydrolysable organosilicon compound and a phosphonate compound that is encapsulated within an encapsulating material.

US Patent:

7540328, Jun 2, 2009

Filed:

Sep 20, 2007

Appl. No.:

11/858266

Inventors:

J. Ernest Brown - Katy TX, US
John W. Still - Richmond TX, US
Diankui Fu - Missouri City TX, US
Zhijun Xiao - Sugar Land TX, US
Wayne Frenier - Tulsa OK, US

Assignee:

Schlumberger Technology Corporation - Sugar Land TX

International Classification:

E21B 43/27

US Classification:

1663081, 1662801

Abstract:

A dry solid composition is disclosed that, when added to an aqueous liquid, provides a slurry that can be used in sandstone acid fracturing. The slurry generates hydrofluoric acid downhole to etch the sandstone fracture faces created. The chemical and physical properties of the composition result in very uneven etching of the fracture faces, enhancing the fluid conductivity of the final fracture. Optionally, inert masking materials may be included in the dry composition, or added to the slurry, to increase the inhomogeneity of the etching and further increase the fluid conductivity.

US Patent:

7748457, Jul 6, 2010

Filed:

Jan 13, 2006

Appl. No.:

11/306869

Inventors:

Ian C. Walton - Sugar Land TX, US
John W. Still - Richmond TX, US
Alfredo Fayard - Houston TX, US
Charles Woodburn - Marnes-la-Coquette, FR

Assignee:

Schlumberger Technology Corporation - Sugar Land TX

International Classification:

E21B 43/26
E21B 43/263
E21B 43/27

US Classification:

1663081, 166307

Abstract:

Methods and systems for creating fractures in a geological formation surrounding a well bore. In one implementation, a treatment material may be disposed at the bottom of the well bore. One or more propellant apparatuses may be immersed in the treatment material and a propellant may then be burned inside a first propellant apparatus to create fractures in the geological formation.

US Patent:

7789146, Sep 7, 2010

Filed:

May 21, 2008

Appl. No.:

12/124910

Inventors:

Mohan K. R. Panga - Stafford TX, US
Balkrishna Gadiyar - Katy TX, US
Ryan Hartman - Arlington MA, US
Bruno Drochon - Houston TX, US
John W. Still - Katy TX, US
Bryan Stamm - Houston TX, US

Assignee:

Schlumberger Technology Corporation - Sugar Land TX

International Classification:

E21B 43/04

US Classification:

166278, 166 51, 166300, 507925

Abstract:

A method is disclosed for low damage gravel packing. The method includes combining a carrier fluid, a first amount of particulates, and a second amount of particulates into a slurry. The first amount of particulates have a first average size distribution and the second amount of particulates have a second average size distribution, and the first average size distribution is at least three times larger than the second average size distribution. The slurry includes particles which are at least partially degradable material, and with reactive solid constituents. The reactive solid reacts with the degradable material and/or a hydrolysis product of the degradable material. The method further includes positioning a screen in a wellbore, and circulating the slurry through the wellbore such that the first amount of particulates and the second amount of particulates are deposited on an outer surface of the screen.

US Patent:

7841411, Nov 30, 2010

Filed:

Dec 14, 2007

Appl. No.:

11/956928

Inventors:

Michael J. Fuller - Houston TX, US
John W. Still - Richmond TX, US

Assignee:

Schlumberger Technology Corporation - Sugarland TX

International Classification:

E21B 43/22
E21B 43/267

US Classification:

166300, 166279, 1662802, 166281, 1663083

Abstract:

A method of treating a subterranean formation penetrated by a wellbore is carried out by forming a treatment fluid comprising an aqueous carrier fluid and a solid-form polyimide homopolymer or copolymer capable of hydrolyzing to form polycarboxylates and/or polycarboxylic acids. The treatment fluid is introduced into the formation through the wellbore. In another method, a treatment fluid comprising an aqueous carrier fluid, a solid-form polysuccinimide homopolymer or copolymer and at least one of a viscosifying agent, proppant and an acid capable of dissolving materials of the formation is formed. This is introduced into the formation through the wellbore. A method of treating a sandstone-containing formation penetrated by a wellbore may also be carried out by forming a treatment fluid comprising an aqueous solution containing a hydrogen fluoride source, ammonium hydroxide and at least one of a polyimide and a polycarboxylate, which is introduced into the formation through the wellbore.

US Patent:

7855168, Dec 21, 2010

Filed:

Dec 19, 2008

Appl. No.:

12/339921

Inventors:

Michael J. Fuller - Houston TX, US
Syed Ali - Sugar Land TX, US
Laurent Pirolli - St. Ives, GB
John W. Still - Katy TX, US

Assignee:

Schlumberger Technology Corporation - Sugar Land TX

International Classification:

C09K 8/04
C09K 8/32
E21B 7/00

US Classification:

507145, 166276, 166278, 1663051, 166376, 175 64, 175 65, 507117, 507203, 507268, 507277

Abstract:

The current disclosure describes a multifunctional fluid that addresses a new concept in the removal of filter cake. A composition is disclosed comprising: a carrier fluid, a surfactant, a fluorine source and an organic stabilizer able to minimize precipitation of fluorine The associated method to remove the filter cake is also described.

US Patent:

7886822, Feb 15, 2011

Filed:

Jul 17, 2008

Appl. No.:

12/175203

Inventors:

Marieliz Garcia-Lopez De Victoria - Sugar Land TX, US
John W. Still - Katy TX, US
Toan Bui - Pearland TX, US

Assignee:

Schlumberger Technology Corporation - Sugar Land TX

International Classification:

E21B 43/22

US Classification:

166279, 166300, 166307

Abstract:

A method for treating a subterranean formation includes forming a treatment fluid including a carrier fluid, a solid acid-precursor, and a solid scale inhibitor. The solid acid-precursor includes a material that forms an acid at downhole conditions in the subterranean formation. The method further includes adding a solid acid-responsive material into the treatment fluid, where the solid acid-responsive material enhances formation of acid from the solid acid-precursor in acidic conditions. The method includes performing an acid fracture treatment and inhibiting scale formation within the subterranean formation. The solid scale inhibitor allows for long-term scale inhibition after the treatment.