From Yard to Field: Engineering a Cement Packer Methodology in the Presence of Control Line-Constrained Annuli Filled with Low-Viscosity Resin and Validated Through Acoustic Logging Interpretation

Abstract In today's Oil & Gas environment, where extending well life, optimizing production, and minimizing costs under strict regulatory constraints are key, rig-less technologies represent a strategic alternative to conventional workovers. This study validates a cement packer methodology designed for highly constrained annular geometries complicated by the presence of control lines (CLs), a scenario for which no existing literature addresses the impact on barrier integrity or acoustic log interpretation. Key concerns include the ability of the resin to effectively act as a hydraulic barrier within the CLs, the high risk of both macro- and micro-channeling, the lack of reference acoustic log responses in the presence of CLs (whether empty or resin-filled), and the challenges associated with post-job log interpretation, particularly for regulatory validation. To address these gaps, a yard test and two field applications were carried out to establish a robust annular isolation strategy suitable for these complex wellbore environments. A full-scale setup was built using actual completion hardware, replicating downhole geometry. Two separate test sections were prepared to evaluate the performance of two tailored cement slurries under identical boundary conditions. Overflow and monitoring valves were strategically positioned to detect bypass, validate pressure, and identify channeling. Due to the impracticality of cement placement inside CLs, a low-viscosity resin was engineered for selective partial filling. Its formulation and compressive strength were critical to maintaining hydraulic integrity, preventing the CLs from acting as unintended flow conduits that could bypass the cement packer and compromise zonal isolation. Acoustic logs were acquired before and after resin placement to evaluate impedance variations and differentiate responses between empty and partially resin-filled lines. Post-job, the test sections were cross-sectioned, particularly near CL clamps, to validate log data, visually assess bonding, and identify any channeling or voids. The yard test established acoustic log baselines for resin-filled CLs and cement packer, validated resin placement integrity, and guided slurry selection based on bonding performance and rheology. Field deployments confirmed the feasibility of achieving competent cement packers in geometrically constrained wells. To mitigate the risk of poor bonding, a contingency strategy involving local casing expansion via plastic deformation was implemented to enhance radial contact pressure in critical areas. Additionally, high-rate pumping was used to induce turbulent flow, increasing Reynolds number to optimize slurry placement and minimize channeling in eccentric annuli. Lab and field data confirmed that effective, rig-less annular isolation can be achieved in complex geometries with log-verifiable outcomes. This work presents the first documented evaluation of cement packer deployment in the presence of control lines, establishing acoustic, hydraulic, and mechanical benchmarks. It provides practical guidelines for resin application, slurry design, and logging strategy—addressing a critical operational gap in complex lower completions.