John W 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:

7784541, Aug 31, 2010

Filed:

Jul 16, 2008

Appl. No.:

12/174137

Inventors:

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

Assignee:

Schlumberger Technology Corporation - Sugar Land TX

International Classification:

E21B 43/267
E21B 43/27

US Classification:

1662801, 166283, 166300, 166307, 1663082, 1663083, 507260, 507261, 507923, 507924

Abstract:

A system includes a wellbore in fluid communication with a formation of interest and a fracturing slurry include a carrier fluid with a low amount of a viscosifier, an amount of proppant including a first average particle size between about 200 and 2000 μm, an amount particulates including a second average particle size between about three and ten times smaller than the first average particle size, and a third amount of particulates having a third average particle size smaller than the second average particle size. A sum of all of the particulates in the fracturing slurry exceed about 16 pounds per gallon of the carrier fluid. They system further includes a pumping device that creates a propped fracture in the formation of interest with the fracturing slurry, and a removal agent that removes the second amount of particulates and/or the third amount of particulates from the propped fracture.

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:

7806182, Oct 5, 2010

Filed:

Oct 17, 2008

Appl. No.:

12/253373

Inventors:

George Waters - Oklahoma City OK, US
Paul R. Howard - Sugar Land TX, US
Don Williamson - Katy TX, US
John W. Still - Katy TX, US

Assignee:

Schlumberger Technology Corporation - Sugar Land TX

International Classification:

E21B 21/06
E21B 43/26
E21B 43/267

US Classification:

1662802, 1662801, 166300, 175 66, 507904

Abstract:

A subterranean formation stimulation method utilizes a treatment fluid comprising residual drilling fluid injected into the formation, and producing the stimulated formation. In one embodiment, a tight gas formation is fractured and the fracture has a higher conductivity than the formation.

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.