| 摘要 |
There is disclosed a downhole tool or device adapted to include at least part of a well completion assembly or well drilling assembly. For example, an improved centraliser is provided for centralisation of tubulars such as casings, liners, production screens, production tubing and the like in oil/gas wells in other wells, e.g. water wells. An improved downhole tool device is coated with at least first and second coatings, wherein the second coating layer is molecularly bonded to the first coating layer. The first coating comprises at least partly a material selected from the group consisting of Titanium Nitride (TiN), Diamond Like Carbon (DLC) or Carbon, and wherein the second coating at least partly comprises Tungsten Disulfide (WS2). There is also provided a method of manufacturing a downhole tool or device, wherein the second coating is applied at ambient temperature.
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