Pressure regulated downhole equipment

摘要

Methods and apparatus for regulating fluid pressure in a wellbore. Apparatus comprises a tubular 102, a first 112 and second 114 float assemblies disposed in the tubular, both float assemblies comprising a unidirectional valve 118 for allowing fluid flow in a first direction, wherein the first float assembly is equipped with a pressure regulating device 120 configured to actuate when a predetermined pressure differential is reached.