This document is an expanded abstract.

Summary

The technology of lining tubing with Glass Reinforced Epoxy (GRE) has been used since the 1960’s as a method for corrosion protection of downhole tubing. Over 50,000 GRE Lined tubing completions have been installed in water handling wells, oil and gas producers, gas injection and disposal wells. Nearly 5,000 of these are in the GCC region with only 5 known completions in the U.A.E.. This paper will draw on references of applications of GRE Lined tubing across the GCC region and the value addition that operators have derived from this technology with the aim of generating a comparison with similar operational challenges within ADNOC Group subsidiaries.

Introduction

The 5,000 completions in GCC referred to in the summary are largely in Water Injection and Oil production applications by Saudi Aramco, Kuwait Oil Company, Qatar Petroleum, Qatargas, Petroleum Development Oman, along with several foreign oil companies in Iraq and Oman. At the time of submitting this paper, only 5 known GRE lined completions have been run in the United Arab Emirates. As formations across the region have similar properties, it is expected that the U.A.E. must share similar operational challenges as its neighbors posed by similar downhole process conditions. While these may be addressed using alternative mitigation strategies, GRE Lining may be a viable option that has been underexplored in the U.A.E.

Changes in Downhole Environments in the U.A.E.

Ageing oilfields will naturally exhibit increasing water cut and increasing concentrations of H2S, CO2 and Chlorides that adversely impact the service life of production completion run in these fields several years ago. This problem is compounded by the increased implementation of Water Flooding using Produced Water and treated Seawater.

Produced Water and Seawater require extensive treatment to reduce the concentrations of corrosive elements before injection downhole. This comes with the risk of a double edged sword – too much chemical treatment is a waste of Opex while too little is harmful to the completion – necessitating constant monitoring of chemical injection over the life of the well.

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