Wellbore balanced pressure compensation for rotating control device (rcd) rotary seals

Abstract

A seal assembly of a rotating control device (RCD) includes an interior chamber isolated from an external portion of the RCD and configured to store compensation fluid. The seal assembly also includes a piston that is configured to isolate the compensation fluid in the interior chamber from a wellbore fluid. The seal assembly also includes a path coupled to the interior chamber, a seal chamber coupled to the path, and a seal element disposed in the seal chamber and configured to form an annular seal about a tubular as the tubular rotates, moves axially, or both. The seal element is configured to receive the compensation fluid from the interior chamber at a first pressure via the path, the first pressure matching a second pressure of the wellbore fluid so that a pressure differential across the seal element during operation is zero.

Dependencies are inferred from the claim text.