Pressure communicating, fluid isolating interface
AssigneeHalliburton Company
InventorsJohn R. Dennis, Billy W. White
Life of this patent
Estimating the term…
Abstract
A housing which is connectible to a pressure sensitive tool has a filter cartridge mounted within it to communicate a pressure from an external fluid to a clean fluid contained within the filter cartridge and the tool. The filter cartridge includes one or more filters having a plurality of passageways small enough to hold the clean fluid under pressure equilibrium conditions, but large enough to communicate pressure from the external fluid to the clean fluid. There are enough of such passageways so that it is unlikely that all will become clogged by an contaminants within the external fluid should a portion of the external fluid be sucked in through the filter in response to expansion and contraction phenomena of the clean fluid.
Claims11
An apparatus for communicating pressure from a bore hole fluid between a pressure inlet receiving the bore hole fluid and a pressure outlet while isolating the bore hole fluid from the pressure outlet, said apparatus comprising:
- a housing having the pressure inlet and the pressure outlet defined therein and further having a hollow region defined therein between the pressure inlet and the pressure outlet;
- a pressure communicating fluid received in said housing;
- and
- means, disposed within said hollow region, for communicating the pressure from the bore hole fluid to said pressure communicating fluid and for providing a plurality of passageways through which the bore hole fluid and the pressure communicating fluid can flow in response to expansion and contraction of said pressure communicating fluid, said means including:
- a filter disposed within said housing between the pressure inlet and said pressure communicating fluid, said filter having said plurality of passageways;
- another filter disposed within said housing between said pressure communicating fluid and the pressure outlet;
- and
- biasing means, disposed within said housing between said two-mentioned filters, for holding said filters spaced from each other so that a volume is defined between said filters, said volume having said pressure communicating fluid therein.
A filter cartridge for interfacing pressure exerted by a bore hole fluid with a pressure sensitive tool, said cartridge comprising:
- a cartridge shell;
- a first filter disposed within said cartridge shell;
- a second filter disposed within said cartridge shell and spaced from said first filter so that pressure from the bore hole fluid is communicated through said first filter and said second filter;
- a spring disposed in said cartridge shell for separating said first and second filters;
- and
- piston means, slidably disposed within said cartridge shell adjacent said first filter, for moving said first filter against said spring.
Dependencies are inferred from the claim text.