February 25, 2003

The present invention is directed to a drilling rig base and a lower mast section that are collapsible into a compact transportable position. The base is expandable in the field to support a drilling platform and all necessary equipment, and the telescoping mast is also expanable for supporting the crown block and cables of the drawworks. More specifically, the rig of the present invention has a base having a plurality of beams, the outer beams being collapsible to a transportable position for placing on a single truck or trailer, and the A-frame lower mast section which is collapsible to a transportable position for placing on a single truck or trailer.

11

February 25, 2003

09/411,603

October 1, 1999

52/651.01   182/141 182/152 52/125.6 52/143 52/64 52/651.05

E21B   15/00   (20060101)  

RELATED APPLICATION This application is based on provisional application Ser. No. 60/102,885 filed Oct. 2, 1998 by Don L. Bockhorn and Johnnie A. Parker entitled Mobile Rig Designs.

52/64   52/651.01   52/651.05   52/112   52/66   52/125.6   52/116   52/67   52/72   52/143   52/646   182/152   182/141   248/166   248/170   248/439