National Oilwell Varco, L.p.

National Oilwell Dht, L.p.

Reedhycalog, L.p.

Rajagopala N Pillai

Jiinjen Albert Sue

Harold Sreshta

Anil Kumar

Russell C Gilleylen

Wei Liu

William Randal Bunker

Helna George

A method of joining a steel first member to a stainless steel second member includes buttering a first joint surface on the first member, the buttering including: preheating the first joint surface; welding a border layer of weld material to the first joint surface; and heat treating the border layer and the first joint surface after welding the border layer. A weld is formed between the first and second members after heat treating the border layer and the first joint surface. The border layer and a second joint surface on the second member are preheated; and a body of weld material is added between the border layer and the second joint surface.

Weld joints involving dissimilar metals and methods for forming same

A coating for a diamond table of a cutting element is described. The coating is employed to fill a plurality of voids left by the manufacturing process that compromise the integrity of the cutting element and the associated downhole tooling. The coating may comprise diamond nanoparticles in a metal matrix and may be used with or without a binder layer applied directly to the diamond table, the coating may alternatively be a pure diamond film coating, and may be employed to fill voids left by the manufacturing process.

Downhole drill bit with coated cutting element

A downhole tool comprises a body made of a metal or metal alloy. In addition, the downhole tool comprises a coating disposed on the body. The coating includes at least 75 vol % tungsten carbide having an average grain size less than 1.0 &#x3bc;m. The content of tungsten carbide in the coating with a grain size less than 0.5 &#x3bc;m is between 40 and 64 vol % of the coating.

High strength corrosion resistant high velocity oxy fuel (HVOF) coating for downhole tools

A hardmetal composition comprises tungsten carbide in an amount greater than 50 weight percent of the hardmetal composition. In addition, the hardmetal composition comprises a binder material consisting of at least 90 weight percent nickel, a binder flux between 3.5 to 10.0 weight percent chosen from the group consisting of boron and silicon, and less than 1.0 weight percent other components.

Growing community of inventors

Pasadena, TX, United States of America

Rajagopala N Pillai