Trapped pressure compensator

摘要

A hanger seal system includes a first seal and a second seal disposed between a hanger and a hanger housing, creating a fixed-volume annular region filled with a first fluid; and a trapped pressure compensator (TPC) disposed in the annular region and filled with a second fluid. The TPC is collapsible from an initial position to a collapsed position in response to a pressure being applied to the outside of the TPC exceeding a predetermined amount. Additionally, the TPC occupies an initial volume in the initial position and a reduced volume in the collapsed position and a fluid pressure in the annular region exceeding the predetermined amount causes the TPC to move from the initial position to the collapsed position. This causes an increase in volume of the annular region such that the fluid pressure in the annular region is below the predetermined amount when the TPC is in the collapsed position.

主权项

1. A hanger seal system, comprising:
a first seal and a second seal disposed between a hanger and a hanger housing, creating an annular region filled with a first fluid; and a trapped pressure compensator (TPC) disposed in the annular region and filled with a second fluid, the TPC comprising a hollow body defining an outer profile of the TPC, wherein the hollow body is collapsible from an initial position to a collapsed position in response to a pressure in the annular region being applied to the outside of the TPC exceeding a predetermined amount; wherein the hollow body occupies an initial volume in the initial position and a reduced volume in the collapsed position; and wherein when the hollow body is in the collapsed position, the pressure in the annular region is lowered and the volume in the annular region is increased.