Patent ID: 9238957
Filing Date: 2016-01-19
CPC Classification: E21B

Claim Text:
1. A downhole apparatus for positioning in a wellbore extending through a subterranean formation, the apparatus comprising: a tubular housing defining a first interior passageway and having a plurality of injection ports providing fluid communication between the first interior passageway and the wellbore; a tubular sleeve defining a second interior passageway and positioned in the housing such that an annulus is defined between the sleeve and the housing, the annulus having an annular opening located at an upper end of the sleeve; and an annular orifice positioned within the annulus and upstream of the injection ports; wherein the tubular sleeve comprises an elongated portion extending upstream of the annular orifice such that an annular chamber is defined between the elongated portion of the sleeve and the housing, the elongated portion having a plurality of sleeve ports providing fluid communication between the second interior passageway annulus; and wherein the first and second interior passageways are in fluid communication with the annular chamber via the plurality of sleeve ports and the annular opening.