Ensuring Systems Compatibility for Deepwater Chemicals

Abstract

Efficient production of oil and gas generally relies on the use of specialty chemicals to prevent solids deposition, inhibit corrosion, and control fluid phase properties. While performance testing is an important step in selecting appropriate chemicals for such applications, the compatibility of the chemicals with materials used in the production system is critical to the successful implementation of any chemical treating program. Extensive formulation work, laboratory testing, and field verification are required to ensure that production chemicals will be compatible with system metals and polymers used in pumps, umbilicals, and capillaries. In offshore applications, particularly in deepwater where many components of the production system are not readily accessible, the systems compatibility of any production chemical is an essential part of the flow assurance process. This paper will focus on compatibility of production chemicals typically used in deepwater applications with system materials, and the deliverability of these chemicals through umbilicals and capillaries. Materials commonly used in deepwater installations were chosen, including mild steels, stainless steels, Nylon 11, elastomers, and thermoplastics. Standard test procedures including documentation were implemented. The results of a comprehensive study of corrosion, paraffin, asphaltene, hydrate and scale inhibitors will be discussed. Using material compatibility data for performance chemicals enhances the selection process for existing production, optimizes material selection and design in the development stage for new production, and facilitates formulation of new products.