“Investigation of New Tool to Unload Liquids from Stripper-Gas Wells” (A. Ali, SPE/White Paper #84136)

This SPE White Paper (drawn from a graduate MS thesis by Ahsan Ali) covers the Vortex method for unloading and restoring continuous production of low-rate (stripper) gas wells. The performance of the Vortex tool was examined using a 125-ft. vertical flow loop of two-inch diameter clear PVC at the Texas A&M Petroleum Engineering school. The Vortex tool was found to alter the basic flow structure in the pipe, resulting in improved liquid flow and reduced friction, lower slugging and a reduced critical rate. The tool was observed to reduce tubing pressure loss by up to 17% and to lower the minimum gas velocity required to lift liquids up the tubing string below Turner/Coleman theories. PDF