Patent attributes
A flexible/rigid drilling assembly that can be flexible enough to bend around and into a curved hole form a vertical well to the horizontal with a short horizontal hole extension. When the flexible/rigid drilling assembly is placed in the short horizontal hole extension it can be converted to a rigid assembly and provide stability for a drill bit on its end to drill a straight horizontal out into an oil, gas or water. High static drilling fluid pressure with low compression force on the flexible/rigid drilling assembly is used to keep it in a flexible configuration while being placed in the short horizontal hole extension. Then the flexible/rigid drilling assembly is rotated to release the high static drilling fluid pressure. With the high static drilling fluid pressure released and with the high compression forces required to operate the drill bit the flexible/rigid drilling assembly transition into its rigid configuration and provide stability for a drill bit in drilling a straight horizontal drain hole.
