Rethinking Completion Design: A Numerical and Experimental Evaluation of Autonomous Inflow Control Versus Traditional Openhole Gravel Packs

Abstract

Conventional sand control design relies heavily on PSD and often defaults to gravel packing to mitigate hotspot and erosion risks in challenging formations. This paper evaluates whether AICV-enabled stand-alone screen completions can offer a more robust alternative where operational complexity allows. Using field data, near-wellbore simulations, and experimental analysis, the study compares AICV completions with conventional stand-alone screens and modeled gravel-pack solutions for managing influx and sand production. The study assesses well productivity and performance of AICV and stand-alone screen completions by tracking trends in productivity indices and cumulative production. Field data indicate that AICV-completed wells consistently maintain a more stable productivity, and near-wellbore modeling demonstrated that such wells deliver a more uniform influx along the wellbore. To understand the mechanisms behind this performance, experimental tests were conducted to quantify how screen entrance velocity affects flow behavior and sand control in stand-alone and gravel-pack screens. Reservoir modeling was then applied to predict and history-match flow profiles for the field completions, providing a simulated baseline to evaluate theoretical openhole gravel-pack (OHGP) performance. Laboratory results confirmed that screen plugging is strongly correlated with elevated entrance velocities, highlighting the long-term advantages of AICVs due to the enhanced flow segmentation and autonomous regulation. Experimental and numerical evaluations demonstrated that wells completed without AICVs experience extreme localized velocities during water and gas breakthrough, leading to rapid fines mobilization, localized fluidization, elevated erosion risk, and intensified crossflow. In several simulated scenarios, localized flux in passive SAS and OHGP configurations exceeded that of AICV wells by up to 11 times, with unmitigated entrance velocities exceeding 1.0 m/s—levels experimentally proven to induce total hydraulic lift-off, initiate severe screen plugging, and accelerate performance decline. These findings explain the long-standing limitations of stand-alone screens and the industry's reliance on aggressive qualification testing. In contrast, the AICVs autonomously restricted breakthrough flow, limited total influx, and maintained uniform flow distribution along the wellbore. This significantly reduced high velocity periods associated with fines release and screen plugging. Laboratory testing confirmed that actively distributing fluid influx prevented localized cratering, preserving the structural stability and flow capacity of the sand face. Field results aligned with experimental trends, with AICV wells sustaining productivity more effectively than the historical SAS offset wells. Overall, the combined field, numerical, and laboratory evidence indicates that, where operational complexity, economics, and risk tolerance permit, AICV-enabled stand-alone screens can serve as a viable alternative to conventional OHGP and stand-alone screen designs. This study links screen plugging directly to localized entrance velocities and shows how AICVs prevent these extremes, enabling stand-alone screens to outperform passive completions. The findings support revising screen-testing protocols and reconsidering stand-alone screens in applications traditionally limited to OHGP.