ROTARY STEERABLE DRILLING TOOL

摘要

The device contemplated provides a method for positioning the drill bit in a drilling operation to achieve small changes in hole angle or azimuth as drilling proceeds. Two different positions are available to the operator. The first is a straig ht ahead position where the tool essentially becomes a packed hole stabilizer assembly. The second position tilts the bit across a rotating fulcrum to give a calculated offset at the bit- formation interface. The direction that the bit offset is applied in relatio n to current hole direction is controlled by positioning the orienting pistons prior to each drilling cycle, through the use of current MWD technology. Components of the tool comprise a MWD housing, upper steering and drive mandrel, non-rotating position housing, lo ws drive mandrel splined with the upper mandrel, rotating fulcrum stabilizer and dril l bit.