Well tool having a removable collar for allowing production fluid to flow

The present invention relates to a device 120 comprising a tubular body including an outer wall defining an inner area of the tubular body and including an opening therethrough; a collar positioned in the inner area of the tubular body for preventing fluid flow through the opening in the tubular body during a hydraulic fracturing process; the collar having an outer wall defining an inner area for allowing fluid to flow through the collar, at least part of the collar being removable or dissolvable for forming an opening 224 in the outer wall of the collar for a flow path to allow production fluid to flow between the inner area of the collar and the outer area of the tubular body through the opening in the outer wall of the collar and the opening in the tubular body subsequent to a hydraulic fracturing process, wherein the tubular body comprises a first portion of the outer wall 226 that has the opening 224 having a first inner diameter that is greater than a second inner diameter of a second portion of the tubular body, the collar having an outer diameter that is greater than the second inner diameter and less than the first inner diameter for being coupleable in the first portion such that an indentation in an outer surface of the collar is aligned with the opening, the collar being at least partially removable such that a third inner diameter of the collar is substantially equal to the second inner diameter of the tubular body and the indentation forms the opening in the outer wall of the collar.