RCD seals that do not require lubricant overpressure

Kalsi Seals-brand rotary seals have been used in rotary control devices (RCDs) for a number of years. Prior to this year, however, usage has been restricted to lubricant overpressure type RCDs, where the lubricant supply provides seal lubricant at a pressure that is several hundred psi greater than the pressure of the wellbore. A pair […]

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