DRS-M

The mechanical locking Drag Reduction Swivel (DRS-M) is a single-state drill pipe swivel that allows for the independent rotation of a liner or lower completion deployment string whilst keeping the string below the tool static, protecting jewellery sensitive to torque or rotation, such as sand screens, slotted pipe or open hole packers from harmful torque and extending the envelope of extended reach completions. 

Independent drill pipe rotation aids significantly in redistributing friction forces lost to side loading and drag in the cased hole, leading to an initial increase in hook load, which when needed can be slacked off to push a lower completion system to target depth in high angle, extended reach wells without reaching block weight or inducing buckling. 

The DRS-M is capable of swivelling in tension, compression and neutral and through transitions thereof and has a large through bore to accommodate the passage large drop balls or darts for liner hanger and other hydraulic device setting. 

In cases where a wellbore obstruction is encountered, more weight can be set down against it with delayed onset of pipe buckling compared to tripping without independent drill string rotation. 

The DRS-M uses an industry proven, cost effective, low torque roller bearing system. 

A left-lock mechanical sprag clutch system allows for torque or rotation to the left (only) if required to contingency release a liner hanger or packer running tool. 

The DRS-M is unaffected by hydraulic pressure changes, remaining in its single state from picking up to laying down, meaning swivelling to the right is always functional, even post liner hanger setting and releasing operations, allowing for the independent deployment string rotation of combination well bore clean up tools above the DRS-M whilst keeping sensitive items such as small OD inner strings and running tools static.