John E Fitch

US Patent:

8432157, Apr 30, 2013

Filed:

Sep 30, 2010

Appl. No.:

12/895099

Inventors:

John Kenneth Fitch - Westford MA, US

Assignee:

Rockwell Automation Technologies, Inc. - Mayfield Heights OH

International Classification:

G01B 7/14

US Classification:

32420715

Abstract:

Systems and/or methods are provided for cancelling stray magnetic fields escaping out the back or sides of an inductive proximity sensor. The inductive proximity sensor includes a coil assembly with a sensing coil. The sensing coil detects magnetic flux escaping out the sides and/or back of the sensor. An active circuit couples to the sensing coil. The active circuit generates a canceling current based upon a current and/or electromotive force in the sensing coil due to the flux. The cancelling current drives a driven coil to generate a magnetic field which can reduce total flux through the sensing coil to zero.

US Patent:

44753861, Oct 9, 1984

Filed:

Jun 6, 1983

Appl. No.:

6/501455

Inventors:

John L. Fitch - Dallas TX
W. D. Lyle - Roanoke TX

Assignee:

Mobil Oil Corporation - New York NY

International Classification:

E21B 4706
E21B 4900

US Classification:

73151

Abstract:

A borehole gravimety system employs a pair of pressure transducers for lowering into a borehole along with a borehole gravity meter. The pressure transducers are spaced apart vertically within a pressure sonde for producing a pressure differential measurement of the wellbore fluid. A pressure differential measurement and a gravity reading is taken for each of a plurality of vertical locations within the borehole as the borehole gravimetry system is advanced through the borehole.

US Patent:

43856624, May 31, 1983

Filed:

Oct 5, 1981

Appl. No.:

6/308754

Inventors:

Lynn D. Mullins - DeSoto TX
John L. Fitch - Dallas TX

Assignee:

Mobil Oil Corporation - New York NY

International Classification:

E21B 4322

US Classification:

166263

Abstract:

Oil may be recovered from viscous oil-containing formations including tar sand deposits by providing at least one injection well and at least one spaced-apart production well which extend downwardly from the surfaces and which extend to, and generally horizontally through, the bottom of the oil-containing formation with fluid communication of the horizontally extending portions of each well with the oil-containing formation. Solvent is injected into the injection well and fluids including oil are recovered from the production well until the fluid recovered contains an unfavorable amount of solvent, preferably at least 90 percent. After injection of the solvent is terminated, both the injection well and the production well are shut-in and the formation is allowed to undergo a soak period for a predetermined time, preferably for a time of between 2 to 20 days per foot of formation thickness. After the soak period, solvent is injected into the production well and fluids including oil are recovered from the injection well until the fluid recovered contains an unfavorable amount of solvent, preferably at least 90 percent. After injection of the solvent into the production well is terminated, both wells are shut-in and the formation is allowed to undergo a second soak period for a predetermined time, preferably for 2 to 20 days per foot of formation thickness.

US Patent:

43735851, Feb 15, 1983

Filed:

Jul 21, 1981

Appl. No.:

6/285696

Inventors:

John L. Fitch - Dallas TX
Lynn D. Mullins - De Soto TX

Assignee:

Mobil Oil Corporation - New York NY

International Classification:

E21B 4322

US Classification:

166263

Abstract:

Oil may be recovered from viscous oil-containing formations including tar sand deposits by first establishing a fluid communication path in the lower portion of the formation intermediate at least one injection well and a production well. A hydrocarbon solvent having a density less than oil contained in the formation and a viscosity not greater than 1/100 the viscosity of the oil contained in the formation under formation conditions is injected into the communication path and fluids including oil are recovered from the production well until the fluid recovered contains an unfavorable ratio of oil to solvent. The production well is shut-in and an additional quantity of the hydrocarbon solvent is injected into the fluid communication path, preferably until a total amount of between 0. 05 to 0. 30 pore volume. The injection well is then shut-in along with the production well to permit the formation to undergo a soak period for a variable time, preferably for a time of between 2 to 20 days per vertical thickness in feet of oil-containing formation.

US Patent:

43656781, Dec 28, 1982

Filed:

Nov 28, 1980

Appl. No.:

6/210914

Inventors:

John L. Fitch - Dallas TX

Assignee:

Mobil Oil Corporation - New York NY

International Classification:

E21B 1716
E21B 1722

US Classification:

175323

Abstract:

A tubular member for a drill string used in the rotary drilling of deviated boreholes, which includes an outer circumferential surface which is contoured and adapted to engage the wall of the borehole so as to produce a longitudinally downward force on the drill bit upon rotation of the drill string. The tubular member may be a drill collar or section of drill pipe, wherein the contoured surface is constituted of a helical thread of a pitch which will impart a longitudinal force towards the drill bit upon rotation of the tubular member.

US Patent:

44150350, Nov 15, 1983

Filed:

Mar 18, 1982

Appl. No.:

6/359398

Inventors:

William L. Medlin - Dallas TX
Malcolm K. Strubhar - Irving TX
John L. Fitch - Dallas TX

Assignee:

Mobil Oil Corporation - New York NY

International Classification:

E21B 4326

US Classification:

166308

Abstract:

A well casing penetrating a plurality of subterranean hydro carbon-bearing formations is perforated adjacent select ones of such hydrocarbon-bearing formations that are expected to exhibit at least a minimum pressure increase during fracturing operations. A fracturing fluid is pumped down the well through the perforations, and into the formations so as to fracture each of the select formations during a single fracturing operation.

US Patent:

44651465, Aug 14, 1984

Filed:

Sep 20, 1982

Appl. No.:

6/419881

Inventors:

John L. Fitch - Dallas TX

Assignee:

Mobil Oil Corporation - New York NY

International Classification:

E21B 704
E21B 1716
E21B 1722

US Classification:

175 61

Abstract:

A tubular member for a drill string used in the rotary drilling of deviated boreholes, which includes an outer circumferential surface which is contoured and adapted to engage the wall of the borehole so as to produce a longitudinally downward force on the drill bit upon rotation of the drill string. The tubular member may be a drill collar or section of drill pipe, wherein the contoured surface is constituted of a helical thread of a pitch which will impart a longitudinal force towards the drill bit upon rotation of the tubular member.

US Patent:

39839419, Oct 5, 1976

Filed:

Nov 10, 1975

Appl. No.:

5/630104

Inventors:

John L. Fitch - Dallas TX

Assignee:

Mobil Oil Corporation - New York NY

International Classification:

E21B 4302

US Classification:

166276

Abstract:

This specification discloses a method of completing a cased well that penetrates a subterranean formation to control the production of sand from the formation. The well is provided with perforation tunnels that extend through the casing and communicate with the formation. Removable plugs are formed in the perforation tunnels and thereafter a gravel pack is formed and consolidated in the well within the casing adjacent the perforation tunnels. Thereafter the removable plugs are removed from the perforation tunnels to provide unobstructed tunnels for the flow of fluids from the formation into the well. The formation adjacent the perforation tunnels may also be consolidated to mitigate the movement of sand from the formation into the perforation tunnels.