National Oilwell Varco, L.p.

Parul Walia Dhall

Jiinjen Albert Sue

Guodong Zhan

Terry R Matthias

Michael Scott Nixon

Walter Rothrock

Raju Pillai

A hardfacing composition composed of an Fe&#x2014;Cr alloy. The alloy is comprised of 80 wt % iron, about 2 wt % to about 20 wt % Cr, less than 1 wt % Si and less than 1 wt % C. The alloy's microstructure is at least 80 vol % martensite; and less than 20 vol % austenite.

Laser cladding Fe&#x2014;Cr alloy on downhole tools

A method is disclosed for leaching a polycrystalline diamond (PCD) cutter element. In an embodiment, the method includes suspending the PCD cutter element above a liquid acid bath. In addition, the method includes elevating the temperature of the liquid acid bath above ambient conditions to transition at least some of the liquid acid bath to acid vapors. Further, the method includes elevating the pressure of the acid vapors above ambient conditions. Still further, the method includes exposing the PCD cutter element to the acid vapors.

Systems and methods for vapor pressure leaching polycrystalline diamond cutter elements

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Spring, TX, United States of America

Parul Walia Dhall