The torque reduction sub (TRS) is an integral drill string component consisting of a short one piece mandrel utilising proprietary bearing technology to support a non rotating one piece sleeve. Tools can be positioned between the connections of the drill pipe and spaced appropriately to cover the build section of the wellbore.
The use of these tools can reduce drilling torque by significant amounts(25-35%) and is also effective at reducing string transmitted vibration.
The TRS’s are designed to reduce practice torque in high angle and horizontal wells. They can also protect casing when used for Through Tubing Rotary Drilling (TTRD). Paradigm utilises Sysdrill and when provided with the proposed well trajectory can optimise numbers and placement of TRS.
Features & Benefits
Reduce drill string wear and fatigue
Minimizes torque and drag
Minimizes casing wear
Enhances drilling efficiency
Through a collaboration of in-house
drilling experience and analysis using well-simulation software . Paradigm have
determined that the majority of side load(therefore torque loss) encountered in
high build wells occurs over the build section itself . Dogleg severity is the
most important factor in determining the spacing of the subs, there fore ,
placing TRS tools as recommended from the well analysis(for example every
second or third tool joint) to cover the build section for the duration of the
bit run , will significantly reduce torque levels and associated casing wear.
The tools lift the tool joint off the casing wall and provides an engineered bearing within the mandrel so the drill string rotates freely within the well bore with minimum effective coefficient of friction over the highest side loading interval , and the minimum of rubbing contact against the casing.
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