Abstract: The disclosure provides a PCD element containing a substrate and a PCD layer. The PCD has a top surface, a side surface, an intermediate surface, an unleached region containing a diamond body matrix and an interstitial matrix including a catalyst, and a leached region containing a diamond body matrix and empty space in the place of the interstitial matrix. The catalyst has been leached from the empty space in the place of the interstitial matrix. The unleached region is adjacent to a substantial portion of the side surface and the leached region is not adjacent to a substantial portion of the side surface, and the leached region is adjacent to the top surface or the intermediate surface. The disclosure also provides a system and method for leaching a PCD element including a liquid able to leach a catalyst and a protective member.

Abstract: Provided are coated sleeved oil and gas well production devices and methods of making and using such coated sleeved devices. In one form, the coated sleeved oil and gas well production device includes an oil and gas well production device including one or more bodies and one or more sleeves proximal to the outer or inner surface of the one or more bodies, and a coating on at least a portion of the inner sleeve surface, outer sleeve surface, or a combination thereof, wherein the coating is chosen from an amorphous alloy, a heat-treated electroless or electro plated based nickel-phosphorous composite with a phosphorous content greater than 12 wt %, graphite, MoS2, WS2, a fullerene based composite, a boride based cermet, a quasicrystalline material, a diamond based material, diamond-like-carbon (DLC), boron nitride, and combinations thereof.