An important part of the drill string
in horizontal and directional wells is the Mud Motor.
Mud motors are used in two main
categories: Steerable and Non-Steerable
Mud Motor PDF
Hydraulic Variable Gauge Stabilizer
(link)
An innovative tool is for precision directional
drilling applications. Unlike most Variable Gauge Stabilizers, the HVGS
is short enough to sit directly behind the mud motor, allowing for
better steering capabilities.
Flow Actuated Circulation Tool
(link)
The development of this type of tool has resulted from the need to be
able to divert the flow away from the mud motor & drill bit and into the
well bore for clean up operations during tubing work. However, the tool
also has a second important use for rotary drilling.
Horizontal oil drilling can be used in many
situations where conventional drilling is either impossible or cost
prohibitive. This is by no means an exhaustive list, but it should get you
thinking about the possibilities of horizontal directional drilling.
