High pressure coring assembly and method
AssigneeCorpro Technologies Canada Ltd.
InventorDouglas Kinsella
Life of this patent
Estimating the term…
Abstract
A wireline or drill pipe retrievable coring tool with an inner barrel to receive a core, a bottom coring tool valve operable to seal off a bottom of the inner barrel and at least one pressure canister operable to receive fluid from the core in the inner barrel. The pressure canister is operable to significantly reduce the pressure inside the inner barrel utilizing an expandable chamber to receive fluid from the core as the tool is removed from the wellbore. In one embodiment, a bottom valve mechanism moves the cored formation materials out of the way of the bottom valve before the bottom valve is closed.
Claims25
A coring tool retrievable to a surface position from a wellbore to obtain cored formation from said wellbore, comprising:
- an inner barrel which is operable to receive said cored formation;
- a coring tool bottom valve operable to seal off an end of said inner barrel;
- and
- at least one canister interconnected with said inner barrel, said at least one canister comprising an expandable chamber operable to receive and store a fluid from said cored formation in said inner barrel as said coring tool is retrieved from said well.
A coring tool retrievable to a surface position from a wellbore to obtain cored formation from said wellbore, comprising:
- an inner barrel which is operable to receive a cored formation;
- a coring tool bottom valve operable to seal off an end of said inner barrel;
- and
- a bottom valve mechanism operable to move said cored formation away from said bottom valve prior to closing said bottom valve.
A coring tool retrievable to a surface position from a wellbore to obtain a cored formation from said wellbore, comprising:
- an inner barrel which is operable to receive a cored formation;
- and
- a bottom coring tool valve operable to seal off a bottom of said inner barrel, said bottom coring tool valve comprising a flapper valve, said flapper valve being configured to utilize a pressure in said cored formation to increase a flapper closing force which holds a flapper element of said flapper valve closed against a flapper valve seat.
A method for making a coring tool retrievable to a surface position from a wellbore to capture a cored formation from said wellbore, comprising:
- providing an inner barrel which is operable to receive a cored formation;
- connecting a bottom valve operable to seal off a bottom of said inner barrel;
- and
- connecting at least one valve to said coring tool to limit pressure in said inner barrel to a predetermined maximum pressure.
Dependencies are inferred from the claim text.