Patent ID: 8925634
Filing Date: 2015-01-06
Classification: E21B

Abstract:
1. A flow restrictor device for production tubing comprising: an obstructing member arranged for movement between a first position where said obstructing member is located so as to form a seal with an edge of an aperture formed in a wall of said production tubing and is arranged to prevent fluid flow through said aperture, and a second position where said obstructing member is located so that the aperture is unobstructed; and a retaining arrangement for restricting possible locations of said obstructing member to said first position, second position and positions therebetween, the retaining arrangement comprising a plurality of elements spaced about a periphery of said aperture and arranged to project therefrom, the plurality of elements forming part of an enclosure in which the obstructing member is moveable, and the plurality of elements having at remote ends thereof means forming the remainder of the enclosure, said means arranged to prevent escape of the obstructing member from an end of the enclosure, wherein said aperture allows fluid communication between the exterior and the interior of the production tubing.