Patent ID: 6966366
Filing Date: 2005-11-22
Classification: E21B

Abstract:
1. A method of retro-fitting a well installation to reconfigure it to provide plunger enhanced chamber lift, said well installation having a casing extending from a wellhead into a geologic zone and an inwardly disposed tubing string of given diameter within said casing extending from said wellhead to a tubing input, and defining a primary annulus with said casing, comprising the steps of: providing a reel-carried supply of coil tubing having a coil diameter less than said given diameter and having an open end; providing a primary seating nipple assembly within said tubing input having an upwardly disposed primary ledge; providing in combination, a primary seal assembly having a primary collar abuttable with said upwardly disposed primary ledge, a primary seal, a receiver housing extending from said primary seal assembly, with a secondary seating nipple having an upwardly disposed secondary ledge, said receiver housing having injection inlets and extending to a connecting portion; attaching said receiver housing connecting portion with said coil tubing at said open end; snubbing said coil tubing into said inwardly disposed tubing string from said wellhead until said primary collar abuts said primary ledge and said primary seal sealingly engages said primary seating nipple, said coil tubing defining a secondary annulus with said tubing string; providing a wire installable and retrievable sealing plug and associated pressure blocking lubricator; installing said sealing plug in releasable sealing relationship within said receiver housing; modifying said wellhead for supplying gas under pressure into said secondary annulus; removing said sealing plug; providing a check valve assembly having a downwardly disposed secondary sealing assembly with a lower secondary seal, a secondary collar and a fluid inlet; positioning said check valve assembly within said coil tubing at a location wherein said secondary collar engages said secondary ledge and said secondary seal sealingly engages said secondary seating nipple; providing a plunger reciprocally moveable within said coil tubing; and installing said plunger within said coil tubing.