Advancing the C-AICD: From Material Screening to System Level Design

Abstract This paper continues the development of the Chemical Autonomous Inflow Control Device (C-AICD), a novel concept that uses fluid-responsive, selectively dissolvable coatings to regulate flow in downhole environments. Building on earlier CFD and design studies by Asthana et al. (2023) and AlMusharraf et al. (2024), this work focuses on material screening, coating development, and system-level design to advance the technology toward laboratory testing and future deployment. A structured material screening process was conducted to evaluate metal oxide powders (SiO2, TiO2, Fe2O3) for staged dissolution in oil–water mixtures. These materials were selected based on solubility trends and hydrophilic/hydrophobic behavior, confirmed through contact angle measurements and preliminary characterization (XRD, FTIR, DSC). A multi-layer core design was proposed, and fabrication trials were conducted using binder-assisted methods. A flow-compatible prototype fixture was designed to simulate annular horizontal flow, and a two-phase flow loop was developed for upcoming validation. Sensor placement, geometry, and flow conditioning were engineered to match field-like test conditions. The selected metal oxides demonstrated distinct dissolution profiles aligned with targeted fluid compositions. Fe2O3 dissolved readily in oil-rich environments, TiO2 responded at intermediate water cuts, and SiO2 remained stable in water-dominant mixtures. This behavior supports their use as outer, middle, and inner shell materials in a staged shutoff design. While full multi-shell core construction and flow testing are ongoing, early characterization confirmed the structural and thermal suitability of the individual layers. CAD-based design and mechanical integration of the C-AICD prototype were completed using downhole relevant dimensions. A flow loop was developed with dedicated separation, multiphase pumping, and instrumentation systems. Together, these developments create a complete experimental platform to validate coating dissolution behavior and flow restriction response. This paper presents the foundational work that bridges concept to testable hardware. This work introduces a chemical-based ICD platform that departs from conventional flow-property selectivity by responding to fluid chemistry. By focusing on staged material dissolution and passive mechanical response, the C-AICD offers a pathway to autonomous shutoff without moving parts. The paper establishes a material and design foundation critical to future validation and field translation of the concept.