Macro and microbiological growth can have significant impacts on safe and efficient operations in oil & gas applications especially in water injection and underground storage systems. Operators must provide protection against both chemical and microbial corrosion to protect assets from degradation and failure. High density polyethylene (HDPE) coatings have been shown to provide long-term corrosion protection for salt brackish and brine piping. However HDPE is susceptible to biodegradation. This study explores the development and testing of a novel HDPE coating containing a unique blend of antimicrobial powder additive engineered to protect against common bacteria and fungi in brine water. Experiments were conducted to evaluate the biological and material performance of the coatings. Results from microbiological testing showed that coatings enhanced with the material additive resisted and deactivated over 70% of bacteria present in the brine water and over 90% of the harmful fungi which causes fouling in pipelines. Testing results indicated that the additive has no significant impact on the mechanical properties or corrosion resistance of the HDPE lining. These results are significant because the additive protects against harmful microbes while maintaining properties of the HDPE system. This technology provides transformative change in prevention methods for on-shore brine pipeline applications.
Integrity of materials in Oil & Gas production wells is critical to meet the objectives of design and the lifecycle performance of wells. This is significant value both in economic terms and health safety and environment. Subsurface uncertainties Aging fields EOR activities and also the quality of procured equipment add to the difficulties in preventing equipment failures in wells. Failures that are especially unforeseen or unanticipated provide crucial feedback to operators and lessons to be learnt. It is imperative for operators to learn improve processes and avoid recurrence of failures.Petroleum Development Oman (PDO) as a large operator with more than 10000 wells has gained important experience and lessons from many such failures. This has contributed significantly to improve the company standards material selection reset the operating envelope and procedures enhance surveillance and improve upon quality assurance and control of new equipment.This paper is a compilation of some of the important lessons learnt from such incidents in the recent past. It discusses the operational experience and learning from different subsurface materials from CS to nickel alloys used in different components such as casing tubing packers and X-trees.