Application of Composite Tubulars for CO2 Storage Wells

This paper evaluates the potential use of composite tubulars in carbon dioxide (CO2) storage wells to prevent the effects of the corrosive environment created by the combination of the components of the injectate and formation fluids, pressure, and temperature conditions; that otherwise would require the use of corrosion resistant alloys (CRA). In a process that consists of reviewing the various types of composite tubulars and their common application, the conditions and operational scenarios in CO2 storage wells, and the challenges compared to conventional steel casing and tubing, the suitability of composite tubulars is evaluated. Using well examples, performance design of the composite tubulars, comparing anticipated well loads against pipe ratings is conducted to determine if structural integrity will be maintained and if their implementation is possible. The typical tubular design considerations applicable to steel tubulars cannot be followed without modification for composite tubular. Certain aspects including the properties of the material and pipe geometry are different and require focused analysis. Some operational concerns, related to long term stability and damage prevention, remain; but many others can be resolved with the use of existing technologies. Although the downhole use of composite tubular is not as extensive, and the design process is not as mature as that of steel or CRA pipe; characteristics like its corrosion resistance, low weight, among others, make composites suitable for specific applications in CO2 storage wells. Currently, corrosion resistant alloys dominate as the material of choice for CO2 storage wells; however, exploring the potential of alternative materials could be beneficial to optimize well cost, reduce casing and tubing lead times, and ultimately scale up the deployment of Carbon Capture and Storage (CCS). Composite tubular is attractive due to their high strength-to-weight ratio and anti-corrosion properties with significant carbon emission savings with respect to its equivalent metal pipe.