The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 07, 2001
Filed:
Dec. 21, 1998
Roger Boulton, Aberdeenshire, GB;
Chen-Kang D. Chen, Houston, TX (US);
Thomas C. Gaynor, Aberdeen, GB;
M. Vikram Rao, Houston, TX (US);
Dresser Industries, Inc., Dallas, TX (US);
Abstract
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.