Deliquification of South Texas Gas Wells Using Corrosion Resistant Coiled Tubing: A Six Year Case History

Abstract

Running coiled tubing can be an effective tool to deliquify gas wells, but this practice was discontinued in early 2000 in ConocoPhillips Lobo Field in South Texas because of problems experienced due to CO2 corrosion with standard coiled tubing metallurgy. Since 2004, ConocoPhillips has installed 90 corrosion resistant coiled tubing velocity strings as an alternative to conventional carbon steel coiled tubing. These installations have yielded 5 mmcfd in incremental gas rate and the change to a corrosion resistant metallurgy has drastically reduced the high failure rate and costly workovers that resulted from previous carbon steel installations. Various key learnings including candidate selection criteria and future application recommendations will be presented in addition to representative well types and production profiles. Metallurgy comparisons, post-use inspection findings and full-cycle cost implications will also be presented.

Multi-Objective Optimization of Structural Parameters for Rotary Flow Jetting Tool Based on Orthogonal Experiment

“…In 2002, Vortex Flow Inc. pioneered the application of vortex flow jetting tool in drainage gas recovery, aiming to curb the pressure drop in the tubing and reduce the critical gas velocity required for gas to carry liquid [4,5]. Subsequently, Surendra et al studied vortex flow jetting tool through indoor evaluation experiments and numerical simulations, respectively [6][7][8][9][10][11][12][13][14].…”