Patent ID: 9157295
Filing Date: 2015-10-13
Classification: E21B

Abstract:
1. A device for restricting the flow of a fluid through tubing installed in a borehole, the device including a plurality of restrictor elements coupled together in a stacked configuration, each restrictor element including a body, the body having a first aperture, a second aperture, and an open portion communicating with the second aperture, the respective first apertures being arranged in fluid communication to define a first, direct flowpath extending through the device, the respective second apertures being arranged in fluid communication to define a second, indirect flowpath extending through the device, the second flowpath extending through the open portion such that in use the second flowpath is defined between the body and an inner wall of the tubing; wherein the body of each restrictor element includes at least a first seal for sealing the body in a bore of the tubing when the device is slidingly received therein; wherein the body includes a circular plate having a central axis which is aligned in use with a longitudinal axis of the tubing, and at least one baffle which extends from the plate into the open portion so that the second flowpath is diverted around the baffle; and the first seal is arranged at a periphery of the plate, and a second seal is arranged to seal the baffle against the inner surface of the tubing in use.