New DrilTec Product Range: Wear Resistant Technology for Advanced Drilling

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Courtesy of Castolin Eutectic

The DrilTec STC Coating system has been carefully designed to cover the needs for coatings on all components of the Bottom Hole Assembly (BHA) drilling tools. The high performance features of these coating systems will match customers' expectations and assist to improve today's drilling technology. Through use of carefully selected material and alloys, the wear performance has been maximized by combining an understanding of the wear and the choice of the right microstructure, combined with WC.

DrilTec STC-100 Series: Our Composite Alloy Rod is made of crushed Tungsten Carbide (WC), embedded in a Nickel Bronze matrix with either sharp-edged cutting grade carbides for milling and cutting operations, or our wear grade, with slightly rounded edges, for applications such as stabilizers and wear pads.

Process description: The composite rods are normally applied using a large oxy-acetylene torch, in conjunction with a range of our brazing fluxes or with our gas flux system, where the flux is introduced to the gas before the flame, thus making it easier for the operator to place the cutting carbides in the correct position. To prevent leaching of the Nickel Bronze alloy, a thin tinning layer of our powder from the STC 400 series is applied using our SuperJet Eutalloy S. A typical example of powder would be STC-326LT but most of our 400 series powders can be used. Pre-heats are determined by the base metal.

DrilTec STC-200 Series: Our Composite Flexible Rope or Rod is made of either crushed or spherical carbides embedded in a NiCrBSi matrix which exhibits exceptional wear resistant properties on a wide range of tools.

Process description: The coating is applied using a large Oxy-Acetylene torch, having first mechanically cleaned the surface and tinned it using our SuperJet Eutalloy S torch and powder from our DrilTec STC 400 series. Pre-heat is governed by the base metal of the component being coated. The rope is applied using a slightly carburizing flame to melt the rope and bond it to the base material. On very small components, TIG can be used, but this may reduce the wear-properties of the alloy.

DrilTec STC-300 Series: The STC-300 series consists of gas-shielded Metal Arc Welding, using either Ni- or Fe-cored wires, with Tungsten Carbide (WC) particles in the core. Also in this series, we have cored wires suitable for either TIG or Oxy-Acetylene welding, again with WC particles in the core, along with fluxing agents.

Process description: The coatings are applied onto a clean surface and pre-heat is based on the base material to be coated. This range can be applied using TIG or Oxy-Acetylene welding for the standard cored rods, or by MIG/MAG for the cored wire supplied on spools. The MIG/MAG version is ideal for automated or semi-automated welding in OEM applications.

DrilTec STC-400 Series: Our DrilTec STC 400 series are coatings based on bonding sintered Tungsten Carbide Inserts (TCI) onto a tool body, using powder welding technology. The most commonly used powders are Nickel-based. However, powders containing Tungsten Carbide (WC) can also be used for filling between the inserts. The process can be used to apply a wide range of insert sizes and shapes, one of the most commonly used sizes are 13 to 15mm with width of 5mm and thickness varying from 3 to 4mm.

Process description: The surface to be protected is mechanically cleaned and then pre-heated; a thin layer of powder is then applied. Using a SuperJet Eutalloy torch, the inserts to be bonded to the surface are pre-heated and a thin layer of powder is applied to one side. A brick pattern is laid out on the component to be protected; the spacing is typically 3mm, but this can be adjusted, according to specifications. Using the SuperJet C Torch and our C6 tip, the inserts are bonded to the surface and the gaps are flood-filled with a Nickel-based powder such as OTP 126, OTP 331LT or OTP 220NM (for non-magnetic applications).

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