Method and apparatus for permanent measurement of wellbore formation pressure from an in-situ cemented location
AssigneeSensor Developments AS
InventorØivind Godager
Life of this patent
Estimating the term…
Abstract
A pressure gauge system and a method for in-situ determination of a wellbore formation pressure through a layer of cement, comprising; a housing arranged to be permanently installed in said cement on the outside of a wellbore casing, comprising; a pressure transfer means between a first oil filled chamber and a pressure sensor, to isolate said pressure sensor from said oil filled chamber, and a pressure permeable filter port in hydrostatic connectivity with said first oil filled chamber, and a porous string extending from said filter port, said string has a higher porosity and a higher hydrostatic connectivity than said cement for said formation fluid, and is arranged to transfer said formation fluid when it is embedded in said cement.
Claims12
An in-situ system for determination of a pressure of a formation fluid through a layer of cement in a wellbore, the system comprising:
- a housing disposed in the cement and outside a wellbore casing;
- a pressure sensor disposed in the housing;
- a first oil filled chamber disposed in the housing;
- a second oil filled chamber disposed between the first oil filled chamber and the pressure sensor;
- a pressure permeable filter port through a wall of the housing;
- and
- a porous string extending from the filter port and into the cement, the porous string being disposed substantially circumferentially about the wellbore casing and in hydrostatic connectivity with the formation fluid in the cement.
Dependencies are inferred from the claim text.