John M Wolf

US Patent:

20070017679, Jan 25, 2007

Filed:

Jun 30, 2006

Appl. No.:

11/479022

Inventors:

John Wolf - Houston TX, US
Howard McGill - Lufkin TX, US

International Classification:

E21B 37/00

US Classification:

166312000, 166174000

Abstract:

An apparatus for cleaning a wellbore casing includes an outer housing having an axial through passage between an inlet and a first outlet wherein the inlet and the first outlet are adapted for connection in a work string, the outer housing having a second outlet extending in a direction generally transversely of the through passage, an index mandrel slidably located within the outer housing and having an axial bore extending therethrough, the index mandrel being movable relative to the outer housing between a first position in which the second outlet is closed and a second position in which the second outlet is open, a ball seat located on an upper end of the index mandrel, a spring located within the outer housing and biasing the index mandrel toward the first position, a ball retainable on the ball seat to prevent flow from the inlet to the first outlet, and wherein application of a first pressure on the ball forces the index mandrel against the spring into the second position and reduction of said first pressure permits return of the index mandrel to the second position.

US Patent:

20100243258, Sep 30, 2010

Filed:

Mar 26, 2009

Appl. No.:

12/412084

Inventors:

Craig Fishbeck - Conroe TX, US
John C. Wolf - Houston TX, US

Assignee:

Smith International, Inc. - Houston TX

International Classification:

E21B 37/00
E21B 43/00

US Classification:

166311, 1661051

Abstract:

A downhole debris recovery tool including a ported sub coupled to a debris sub, a suction tube disposed in the debris sub, at least one magnet disposed in the debris removal tool, and an annular jet pump sub disposed in the ported sub and fluidly connected to the suction tube. A method of removing debris from a wellbore including the steps of lowering a downhole debris removal tool into the wellbore, flowing a fluid through a bore of an annular jet pump sub, jetting the fluid from the annular jet pump sub into a mixing tube, displacing an initially static fluid in the mixing tube through a diffuser, thereby creating a vacuum effect in a suction tube to draw a debris-laden fluid into the tool, flowing the debris-laden fluid past at least one magnet disposed in a debris housing, and removing the tool from the wellbore is also disclosed.

US Patent:

20100258318, Oct 14, 2010

Filed:

Oct 1, 2008

Appl. No.:

12/681010

Inventors:

John C. Wolf - Houston TX, US

Assignee:

M-I LLC - Houston TX

International Classification:

E21B 37/02
E21B 17/10
B32B 27/14

US Classification:

166311, 166173, 156333

Abstract:

A downhole tool including a resilient body configured to be disposed on a drill string, the resilient body comprising a plurality of radial blades having an abrasive coating, wherein the radial blades are configured to deflect when inserted into downhole tubing, and wherein the resilient body is configured to allow rotation relative to the drill string. Additionally, a method for cleaning downhole tubing, the method including inserting a resilient scraper disposed on a drill string into the downhole tubing, the resilient scraper including a plurality of radial blades having an abrasive coating. The method further including rotating the drill string, and contacting the resilient scraper to an internal wall of the downhole tubing.

US Patent:

20110024119, Feb 3, 2011

Filed:

Mar 27, 2009

Appl. No.:

12/934662

Inventors:

John C. Wolf - Houston TX, US
George Telfer - Aberdeen, GB
James Atkins - Aberdeen, GB

Assignee:

M-I L.L.C. - Houston TX
M-I DRILLING FLUIDS U.K. LIMITED - Aberdeen, Scotland

International Classification:

E21B 31/00
E21B 34/00

US Classification:

166301, 166 99, 1663321

Abstract:

A downhole debris recovery tool including a ported sub coupled to a debris sub, a suction tube disposed in the debris sub, and an annular jet pump sub disposed in the ported sub and fluidly connected to the suction tube is disclosed. A method of removing debris from a wellbore including the steps of lowering a downhole debris removal tool into the wellbore, the downhole debris removal tool having an annular jet pump sub, a mixing tube, a diffuser, and a suction tube, flowing a fluid through a bore of the annular jet pump sub, jetting the fluid from the annular jet pump sub into the mixing tube, displacing an initially static fluid in the mixing tube through the diffuser, thereby creating a vacuum effect in the suction tube to draw a debris-laden fluid into the downhole debris removal tool, and removing the tool downhole debris removal tool from the wellbore after a predetermined time interval is also disclosed. Further, an isolation valve including a housing, an inner tube disposed coaxially with the housing, and a gate, wherein the gate is configured to selectively close an annular space between the housing and the inner tube is disclosed.

US Patent:

20110259610, Oct 27, 2011

Filed:

Apr 21, 2011

Appl. No.:

13/091988

Inventors:

Piro SHKURTI - The Woodlands TX, US
John C. WOLF - Houston TX, US

Assignee:

SMITH INTERNATIONAL, INC. - HOUSTON TX

International Classification:

E21B 33/12
E21B 34/06

US Classification:

166386, 166318, 166193

Abstract:

An isolation device for a frac plug, the isolation device including a ball seat having a seating surface and a ball configured to contact the seating surface, wherein a profile of the seating surface corresponds to a profile of the ball. A frac plug including a mandrel having an upper end and a lower end, a sealing element disposed around the mandrel, and a ball seat disposed within a central bore of the mandrel, wherein the ball seat includes a seating surface having a non-linear profile. A method of isolating zones of a production formation, the method including setting a frac plug between a first zone and a second zone, disposing a ball within the frac plug, and seating a ball in a ball seat of the frac plug, the ball seat including a seating surface having a profile that substantially corresponds to the profile of the ball.

US Patent:

20120006561, Jan 12, 2012

Filed:

Jul 11, 2011

Appl. No.:

13/179974

Inventors:

Joshua Johnson - Spring TX, US
John Chrysostom Wolf - Houston TX, US

International Classification:

E21B 34/06
E21B 34/00

US Classification:

166373, 166318

Abstract:

A system includes a tubular string that is adapted to be deployed downhole in a well and an activation ball. The activation ball is adapted to be deployed in the tubular string to lodge in a seat of the string. The ball includes a spherical body, which is formed from a metallic material that has a specific gravity less than about 2.0.

US Patent:

20120006562, Jan 12, 2012

Filed:

Jul 11, 2011

Appl. No.:

13/180029

Inventors:

Tracy Speer - Houston TX, US
Piro Shkurti - The Woodlands TX, US
John Chrysostom Wolf - Houston TX, US

International Classification:

E21B 34/06
E21B 34/00

US Classification:

166373, 166318

Abstract:

A system includes a tubular string and a hollow ball. The tubular string is adapted to be deployed downhole in a well and includes a seat. An activation ball adapted to be deployed in the well to lodge in the seat. The ball includes an outer shell that forms a spherical surface. The outer shell forms an enclosed volume therein, and the outer shell is formed from a metallic material.

US Patent:

20120061103, Mar 15, 2012

Filed:

Jul 1, 2011

Appl. No.:

13/174860

Inventors:

Jose Hurtado - Houston TX, US
John C. Wolf - Houston TX, US

Assignee:

SMITH INTERNATIONAL, INC. - Houston TX

International Classification:

E21B 33/12
E21B 34/06

US Classification:

166386, 166318

Abstract:

A downhole isolation tool including a sub, a sleeve disposed in the sub, and a ball seat mandrel coupled to the sleeve, the ball seat mandrel having at least two ball seats axially aligned with at least two throughbores disposed within the ball seat mandrel. A method of isolating a well, the method including running a downhole isolation system into a well, wherein the downhole isolation system includes a first downhole isolation tool, the first downhole isolation tool including a first sub, a first sleeve disposed in the sub, and a first ball seat mandrel coupled to the first sleeve, the first ball seat mandrel having at least two ball seats of a first size axially aligned with at least two throughbores disposed within the first ball seat mandrel, dropping at least two balls of a first size into the well, and seating the at least two balls of the first size in the at least two ball seats of the first ball seat mandrel.