Abstract: A user propelled flotation and transportation system, the system including first and second buoyant floats configured to be selectively attached and detached to a user's feet, each of the first and second floats including an elongate hull having a forward end and a rear end, a foot receiving portion provided on a top surface of the hull, a pair of fins extending downward along a length of the hull and arranged to be substantially parallel to form a channel along a bottom surface of the hull, and one or more flaps arranged between the fins and configured to pivot about a line between the fins that is proximate the bottom surface of the hull, wherein the one or more flaps are configured to be movable between a first position extending downwardly from the bottom surface of the hull, and a second position rotated back toward the rear end of the hull.

Abstract: This invention relates to a method of changing the direction of drilling a well bore wherein a cement plug is formed in the well bore at a location therein where the direction of drilling is to be changed and a pilot hole is drilled in the plug. The cement plug is formed using a slurry containing hydraulic cement consisting of discrete particles having a particle size not greater than about 30 microns. The use of such finely divided hydraulic cement significantly reduces the waiting time required for the slurry to develop sufficient compressive strength.