Duane C Uhri

48341819, May 30, 1989

Dec 29, 1987

7/139216

Duane C. Uhri - Grand Prairie TX
Alfred R. Jennings - Plano TX

Mobil Oil Corporation - New York NY

F21B 4326

166281

A process for creating multi-azimuth fractures by hydraulically fracturing a formation via a single wellbore where a special polymer is used as the fracturing fluid. An induced fracture is formed and a solidifiable gel material is injected into the fracture which is allowed to solidify. Thereafter, hydraulic fracturing with the special polymer is repeated causing the fracture trajectory to form contrary to the far-field in-situ stresses.

47424966, May 3, 1988

Jan 3, 1986

6/815969

Alfred R. Jennings - Plano TX
Duane C. Uhri - Grand Prairie TX

Mobil Oil Corporation - New York NY

G01V 100
G01V 140

367 35

A modified acoustic logging tool to evaluate the condition of a gravel pack is disclosed. Said tool is placed in the wellbore near the gravel pack. An initial log is obtained via said tool at the conclusion of the initial gravel pack treatment. Information gained from the log is indicative of gravel fill and quality. Subsequent logging measurements are indicative of changes in said pack and indicative of remedial treatments.

46382542, Jan 20, 1987

May 2, 1983

6/490919

Duane C. Uhri - Grand Prairie TX

Mobil Oil Corporation - New York NY

G01V 338

324323

The preferred geological orientation of geological formations is determined by geological measurements. These measurements are represented by original vectors which are converted into lineations which represent the extension of the vectors to their intersections with a unit sphere. One of the original vectors is designated as a reference and the half axes of all lineations within 90. degree. of the reference are selected and transformed into unit vectors. The selected unit vectors are vector averaged to produce a resultant vector and the magnitude is determined. The steps are repeated for each of the original vectors and the resultant vector having the maximum magnitude is selected as the preferred orientation of the formation.

47141158, Dec 22, 1987

Dec 8, 1986

6/938892

Duane C. Uhri - Grand Prairie TX

Mobil Oil Corporation - New York NY

E21B 4326

166308

A subsurface formation having original in-situ stresses that favor the propagation of a horizontal fracture is penetrated by a cased borehole which is perforated at a pair of spaced-apart intervals to form a pair of sets of perforations. Fracturing fluid is initially pumped down said cased borehole and out one of said sets of perforations to form the originally favored horizontal fracture. The propagation of this horizontal fracture changes the in-situ stresses so as to favor the propagation of a vertical fracture. Thereafter, while maintaining pressure on said horizontal fracture, fracturing fluid is pumped down said cased borehole and out of the other of said sets of perforations to form the newly favored vertical fracture.

46870610, Aug 18, 1987

Dec 8, 1986

6/938891

Duane C. Uhri - Grand Prairie TX

Mobil Oil Corporation - New York NY

E21B 4326

166308

A subsurface formation surrounding a deviated borehole and having original in-situ stresses that favor the propagation of a vertical fracture is penetrated by a cased borehole. The casing is perforated at a pair of spaced-apart intervals to form a pair of sets of perforations. Fracturing fluid is initially pumped down said cased borehole and out one of said sets of perforations to form a first fracture that is oriented in a direction perpendicular to the direction of the least principal in-situ horizontal stress. The propagation of this first vertical fracture changes the in-situ stresses so as to favor the propagation of a second vertical fracture. This is oriented in a direction parallel to the direction of the least principal in-situ horizontal stress. Thereafter, while maintaining pressure in the first vertical fracture, fracturing fluid is pumped down said cased borehole and out of the other of said sets of perforations to form such a second vertical fracture which will now link naturally occurring fractures in the formation to the deviated wellbore.

48484687, Jul 18, 1989

Dec 22, 1987

7/136257

Randy D. Hazlett - Dallas TX
Duane C. Uhri - Grand Prairie TX

Mobil Oil Corp. - New York NY

E21B 4326
E21B 4900

166300

A method for extending a vertical fracture formed in a formation having original in-situ stresses that favor the propagation of a horizontal fracture. In this method, a subsurface formation having original in-situ stresses that favor the propagation of a horizontal fracture is penetrated by a cased borehole which is perforated at a pair of spaced-apart intervals to form separate pairs of perforations. Fracturing fluid is initially pumped down said cased borehole and out one of said sets of perforations to form the originally favored horizontal fracture. The propagation of this horizontal fracture changes the in-situ stresses so as to favor the propagation of a vertical fracture. Said horizontal fracture is extended by placing a chemical blowing agent and surfactant into the fracturing fluid. Gas released by decomposition of said agent causes foam to be generated along with an increase in pressure thereby extending the horizontal fracture. Thereafter, while maintaining pressure on said horizontal fracture, fracturing fluid is pumped down said cased borehole and out of the other of said sets of perforations to form the newly favored vertical fracture.

47249056, Feb 16, 1988

Sep 15, 1986

6/907260

Duane C. Uhri - Grand Prairie TX

Mobil Oil Corporation - New York NY

E21B 4326
E21B 4900

166250

A process for sequential hydraulic fracturing of a hydrocarbon fluid-bearing formation. A fracture is induced in said formation by hydraulically fracturing via one wellbore. Thereafter, while the formation remains pressurized from the first induced-fracture operation, a second hydraulic fracturing operation is conducted via another wellbore substantially within the pressurized formation area of the first fracturing operation which causes a fracture trajectory to form contrary to the far-field in-situ stresses. This second hydraulic fracture will tend to curve away from the first hydraulic fracture and has the potential of intersecting natural hydrocarbon fluid-bearing fractures in said formation.

50333070, Jul 23, 1991

Nov 14, 1990

7/614063

Duane C. Uhri - Dallas TX
Robin B. Montgomery - Mesquite TX

Mobil Oil Corporation - Fairfax VA

G01B 500

73784

A method and apparatus to determine in-situ "creep" displacement in a cored or drilled borehole. A borehole creep displacement (BCD) tool is suspended into the borehole via a wireline logging cable. Gaging piston fluid forces gaging pistons in a mechanical/electrical assembly of said tool to extend and contact the borehole wall which causes gaging pressure to build. Upon reaching a predetermined pressure, excess fluid flows into a micro-motion fluid distribution body and into an actuator assembly causing an accumulator linear variable displacement transformer (ALVDT) to move thereby causing electrical signals to be transmitted to surface equipment. Once the LVDT has been displaced fully, a closed fluid system within the gaging pistons and a micro-motion assembly is created. Thereafter, any movement of the gaging pistons by the borehole wall will cause fluid motion of a micro-motion cylinder which is attached to a micro-motion LVDT. Movement of the micro-motion LVDT can be read as displacement in thousandths of an inch or as a direct mechanical gain for estimating electrical values.