| 摘要 |
<p>A surfactant composition is used to repel down-hole fluids such as crude oil and water to prevent remote viewing cameras (38) from being obscured by such fluids, for extended periods of time. An effective amount of a down-hole fluid repelling surfactant, preferably in the form of a liquid solution, is aplied to an exterior surface of an optical element of the viewing instrument, dried, and polished to prevent down-hole fluids from adhering to the surface of the optical element. A preferred liquid surfactant solution contains as an active ingredient an amount of tricresyl phosphate effective to repel down-hole fluids such as oil and water.</p> |
