Patent ID: 7845399
Filing Date: 2010-12-07
Classification: E21B

Abstract:
1. An apparatus for use with production tubing to pump fluid from a well to the surface comprising: (a) a tubular conduit comprising an upper portion having an open upper end and a lower portion having an open lower end, the upper portion being releasably engaged to the lower portion, the lower portion having an inner or outer diameter greater than the diameter of the upper portion, forming a first internal or external shoulder where the lower and upper portions are engaged; (b) first and second valve sections, each having a one-way valve adapted to allow fluid to pass upward through the valve but not downward, the first valve section being adapted to releasably engage the upper end of the conduit and the second valve section being adapted to releasably engage the lower end of the conduit; and (c) sealing means disposed on the tubular conduit for sealing between the conduit and a well casing comprising at least one ring-shaped V cup having an interior diameter substantially equal to the outside diameter of the upper portion, and oriented such that the cup extends radially outwards and downwards towards the second valve section.