The adjusting rings are subject to wear from high abrasion in combination with slurry erosion and impact. Protecting them with a hard, wear resistant surface deposit.
The adjusting ring is part of the downhole safety joint assembly. The safety joint assembly allows for fast release of the drill string should the components below the packer become stuck. The string can then be removed and the remaining components fished out of the drill hole or reconnected, depending on the situation. As the safety joint provides quick release of the test string if the string below the packer becomes stuck. As the safety joint uses lefthand torque for release, the adjusting ring prevents righthand torque from acting on the shear pins of the safety joint.
Materials Offered by Metco Joining & Cladding
Metco 51060A is a powder designed for application via laser cladding. Its composition consists of a hard, spherical cast tungsten carbide (CTC-S) hard phase homogeneously blended into a self-fluxing matrix alloy. The relatively high chromium content of the matrix alloy also provides quite good corrosion resistance. When applied properly, the deposits are crack-free.
Metco 51059A is very similar to Metco 51060A, but sized for application using plasma transferred arc (PTA). It also has a slightly lower chromium content that is not quite as corrosion-resistant as its laser cladding counterpart.
These products are customer proven to efficiently protect drilling adjusting rings from multiple types of wear.
Additional Material Candidates
PlasmaDur 51322 consists of crushed monocrystalline tungsten carbide (MTC), blended with a gas atomized, nickel-based self-fluxing alloy. It is designed to be used as a hardface overlay applied by PTA. The fully carburized MTC is a stoichiometric compound with a constant carbon content of 6.14% by weight and has a stable single-phase microstructure. Deposits of PlasmaDur 51322 offer very high abrasion resistance. PlasmaDur 51322 offers the best performance against abrasion and slurry erosion while maintaining good impact resistance.
WokaDur NiE-TM is a weld wire composed of a nickel sheath and filled with MTC carbide. It is an effective low-cos option that is readily applied using flux-cored arc welding (FCAW). WokaDur NiE-TM has excellent weldability and the MTC carbide is very resistant to dissolution during welding. Deposits have excellent resistance to wear from abrasion and slurry erosion. When using WokaDur NiE-TM in non-magnetic applications, Metco 1625 can be used as a buffer layer.