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:
Nov. 10, 2015
Filed:
Jun. 28, 2011
Benjamin Paul Dolgin, Newington, VA (US);
William G. Suliga, Manassas, VA (US);
Thomas G. Pepin, Warrenton, VA (US);
John T. Ishibashi, Burke, VA (US);
Michael A. Toreno, Herdon, VA (US);
James A. Nalasco, Fairfax, VA (US);
Benjamin Paul Dolgin, Newington, VA (US);
William G. Suliga, Manassas, VA (US);
Thomas G. Pepin, Warrenton, VA (US);
John T. Ishibashi, Burke, VA (US);
Michael A. Toreno, Herdon, VA (US);
James A. Nalasco, Fairfax, VA (US);
Raytheon Company, Waltham, MA (US);
Abstract
Disclosed is a system and method for horizontal directional drilling (HDD). The system and method utilize predictive algorithms to both characterize the soil within the borehole and to quantify instability within the drillstring. The soil characteristics are represented by a soil coefficient (α), which relates the curvature of the borehole with the length of thrust of the drill rig as well as by comparison of thrust while thrusting with torque while drilling. The value of (α) is obtained by comparison of the historical orientation of the drilling head over the length of the borehole and the borehole shape as determined by an arbitrary navigation sensor. Drillstring instability is determined as a function of historical thrust and torque efficiencies and windup over the length of the borehole.