Evolution of Zawtika Sand Control from Cased Hole Gravel Pack to Alternative Method

Abstract

The Zawtika field, located offshore in Myanmar, is a vital source of natural gas. However, the field has consistently faced significant challenges related to sand production. Sand production occurs when the formation sand enters the wellbore along with the produced hydrocarbons, which can lead to numerous operational problems such as erosion of downhole and surface equipment, clogging of production tubing, and even complete loss of well integrity. Addressing these issues is paramount to maintaining continuous and efficient production. The economic significance of sand control cannot be overstated. The costs associated with managing sand production include frequent well interventions, equipment replacements, and production downtime. These costs can quickly escalate, making it economically unfeasible to operate without effective sand control measures. Thus, the pursuit of cost-effective and reliable sand control techniques is driven by the need to enhance the economic viability of gas production from the Zawtika field. This paper aims to present the evolution of sand control techniques implemented in the Zawtika field. It will detail the transition from traditional methods such as the Cased Hole Gravel Pack (CHGP) to more advanced and alternative approaches. The objective is to highlight how these changes have contributed to improved sand control efficiency, reduced operational costs, and enhanced overall production performance.