Patent ID: 8813844

Claim:
A drilling system for drilling a lateral borehole from a main borehole comprising a casing, the drilling system comprising: a) a tubular conduit through which a fluid can be pumped; and b) a drilling assembly connected to the tubular conduit so as to receive fluid pumped therethrough, the drilling assembly comprising: i) a power conversion unit, through which the fluid flows and which operates to provide a downhole power output; ii) a drilling unit including a drilling apparatus powered by the output of the power conversion unit and operable to drill a lateral borehole into the formation surrounding the main borehole, and a liner unit for storing one or more liners for installation into the lateral borehole; and iii) an anchor unit operable to anchor the drilling assembly in the main borehole when the drilling unit operates to drill the lateral borehole; and iv) a navigation unit comprising a magnetometer, inclinometer, gyro, and a casing collar locator for allowing the drilling assembly to be navigated to a selected depth and orientation; and v) a swage piece configured to seal a liner of the one or more liners to the casing when it is forced into contact with the liner, wherein the liner is sealed such that it remains with the casing in the borehole after the drilling system is removed from the borehole.