Patent ID: 7703509
Filing Date: 2010-04-27
Classification: E21B

Abstract:
1. A gas anchor for use in restricting the movement of solids through a downhole oil pump, the gas anchor comprising: a hollow core defining a central chamber; an outer shell positioned around the hollow core, so as to define an interior region and an exterior region of the gas anchor, and so as to further define an upper region and a lower region of the gas anchor, and wherein the hollow core and outer shell are aligned along a common central axis; wherein the hollow core and outer shell define a plurality of holes passing through the hollow core and outer shell, the holes providing fluid communication from the exterior region to the interior region and into the central chamber, and wherein substantially all of the holes passing through the hollow core and outer shell are aligned along a common angle relative to a radial line normal to the central axis, and wherein such alignment imparts a counterclockwise rotational movement on fluids entering the central chamber from the perspective of an upper region; wherein the central chamber is closed at a lower region; a screen positioned in the upper region relative to the central chamber and substantially aligned along the central axis, the screen defining a screen chamber, the screen chamber in fluid communication with the central chamber, wherein the screen has screen chamber openings that permit solids, contained in the fluid, to pass out of the screen chamber; the outer shell further defining a solids capture chamber positioned around the screen chamber so as to receive solids from the screen chamber and substantially aligned along the central axis, and wherein the solids capture chamber is closed at an upper region; wherein the hollow core and outer shell further define a plurality of flutes providing fluid communication from the solids capture chamber to the lower region; and a concentrator positioned within the screen chamber substantially aligned along the central axis.