Design and Installation of Coiled Tubing Velocity String to Overcome Liquid Loading and Optimize Gas Well Production: Case Study in Tiguentourine Field (TG-352)

Abstract

This thesis is dealing with the application of so-called Coiled tubing velocity string in gas wells, A coiled tubing (CT) velocity string is a known method to unload liquids in gas wells it’s a production string with a smaller cross-sectional flow area installed inside the production tubing to improve gas velocity, thereby avoiding water column accumulation at the bottom of the well. Gas and oil wells often experience a decrease in production ability or abandonment due to factors such as depletion natural of reservoir pressure and diminishing production velocity. Additionally, there is an increase in water and condensate accumulation in the perforation area due to condensation in production tubing through temperature and pressure changes. This condensates production can lead to the formation of a liquid column in the wellbore, inhibiting gas production from the reservoir into the production tubing, known as “Liquid Loading”, of a gas well. Th work firstly gives on overview about Tiguentourine field and then it gives all the important background information of the “Liquid Loading” topic itself; we talked in chapter 03 about the methodology of coiled tubing velocity string design and installation and how that the correct choice of CT size and completion design can optimize gas well productivity we finally used the knowledge of the chapter 03 to study our case of Tiguentourine field well TG-352 to mitigate the liquid loading phenomena , we make also discussion about the gain and benefits of CT VS installation .