Halliburton Energy Services, Inc.

Dresser Industries, Inc.

Roger Boulton

M Vikram Rao

Chen-Kang David Chen

Daniel David Gleitman

Colin Walker

Thomas M Gaynor

B Raghava Reddy

Larry Steven Eoff

Jimmie Dean Weaver, Jr

Lance Everett Brothers

Frank Zamora

Anthony V Palmer

John Ransford Hardin, Jr

James B Terry

Beegamudre N Murali

John R Hardin

Anne M Culotta

Denise Berryhill

John Michael Wilson

Glenda Wylie

Russell M Fitsgerald

Anthony Vann Palmer

Dan Gleitman

Thomas C Gaynor

An assembly and methods for constructing a MONOWELL include a monodiameter casing disposed in a monodiameter wellbore having diametric efficiency with a monobore production delivery system disposed within the monodiameter casing. An assembly for constructing a monodiameter wellbore includes a bottomhole assembly having a overgauge hole drilling member, a directional steering assembly, a measurement while drilling tool, and a logging while drilling tool; a work string attached to the bottomhole assembly and extending to the surface; drilling fluids flowing through the work string and bottomhole assembly; chemical casing casing the borehole; expandable casing disposed in the wellbore; and a sealing composition disposed between the expandable casing and the wellbore.

Method and apparatus for a monodiameter wellbore, monodiameter casing, monobore, and/or monowell

A bottom hole assemblyfor drilling a deviated borehole includes a positive displacement motor (PDM)or a rotary steerable device (RSD)having a substantially uniform diameter motor housing outer surface without stabilizers extending radially therefrom. In a PDM application, the motor housingmay have a fixed bend therein between an upper power sectionand a lower bearing section. The long gauge bitpowered by the motormay have a bit facewith cuttersthereon and a gauge sectionhaving a uniform diameter cylindrical surface. The gauge sectionpreferably has an axial length at least 75% of the bit diameter. The axial spacing between the bit face and the bend of the motor housing preferably is less than twelve times the bit diameter. According to the method of the present invention, the bit may be rotated at a speed of less than 350 rpm by the PDM and/or rotation of the RSD from the surface.

Steerable drilling system and method

An assembly and methods for constructing a MONOWELL includes a monodiameter casing disposed in a monodiameter wellbore having diametric efficiency with a monobore production delivery system disposed within the monodiameter casing. An assembly for constructing a monodiameter wellbore includes a bottomhole assembly having a overgauge hole drilling member, a directional steering assembly, a measurement while drilling tool, and a logging while drilling tool; a work string attached to the bottomhole assembly and extending to the surface; drilling fluids flowing through the work string and bottomhole assembly; chemical casing casing the borehole; expandable casing disposed in the wellbore; and a sealing composition disposed between the expandable casing and the wellbore.

A bottom hole assembly for drilling a deviated borehole includes a positive displacement motor (PDM) or a rotary steerable device (RSD) having a substantially uniform diameter motor housing outer surface without stabilizers extending radially therefrom. In a PDM application, the motor housing may have a fixed bend therein between an upper power section and a lower bearing section . The long gauge bit powered by the motor may have a bit face with cutters thereon and a gauge section having a uniform diameter cylindrical surface . The gauge section preferably has an axial length at least 75% of the bit diameter. The axial spacing between the bit face and the bend of the motor housing preferably is less than twelve times the bit diameter. According to the method of the present invention, the bit may be rotated at a speed of less than 350 rpm by the PDM and/or rotation of the RSD from the surface.

A bottom hole assembly,for drilling a deviated borehole includes a positive displacement motor,having a substantially uniform diameter motor housing outer surface without stabilizers extending radially therefrom. The motor housing,has a fixed bend therein between an upper power section,and a lower bearing section,. The long gauge bit,powered by the motor,has a bit face,with cutters,thereon and a gauge section,having a uniform diameter cylindrical surface,. The gauge section,has an axial length at least 75% of the bit diameter. The axial spacing between the bit face and the bend of the motor housing is less than ten times the bit diameter. According to the method of the present invention, fluid is pumped through the downhole motor to rotate the bit at a speed of less than 350 rpm. A substantial portion of the curved borehole section may be drilled while sliding rather than rotating the motor housing.

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Cape Town, South Africa

Roger Boulton