Inflow control in a production casing

摘要

The present invention relates to a downhole inflow control system for controlling an inflow of fluid into a casing from outside the casing, such as from a reservoir or an intermediate casing. The downhole inflow control system comprises a casing having an axial extension and a wall having a wall thickness (t), an inflow control valve having a housing, an axial extension in an axial direction along the housing, and a spring element moving in relation to the housing, thereby controlling the inflow of fluid through the valve from an inlet of the housing to an outlet of the housing.

主权项

1. A downhole inflow control system for controlling an inflow of fluid into a casing from outside the casing, such as from a reservoir or an intermediate casing, comprising:
the casing having an axial extension and a wall having a wall thickness; an inflow control valve having a housing comprising a seat, an axial extension in an axial direction along the housing, and a spring element moving in relation to the housing, thereby controlling the inflow of fluid through the valve from an inlet of the housing to an outlet of the housing; wherein:
the valve is arranged so that the axial direction of the valve is perpendicular to the axial extension of the casing;the spring element is springy along the axial direction of the valve and perpendicular to the axial extension of the casing to provide a spring force for controlling the flow of fluid through the valve from the inlet to the outlet of the housing;the spring element is a diaphragm acting towards the seat to close an opening;the valve is configured to require the fluid to flow through a flow path of the diaphragm as the fluid passes through the valve to enter the casing from outside the casing; andthe diaphragm is configured to deform towards a seat of the housing to close the flow path through the diaphragm under pressure, the area of the flow path through the diaphragm being maximal when the diaphragm is un-deformed.