Enhancing Production and Reducing Carbon Intensity: A Comparative Analysis of Rigless Microemulsion Technology for Scale Control in Mature Fields

Abstract This paper aims to introduce a novel microemulsion-based chemistry for rigless scale remediation in mature hydrocarbon fields. Our primary objective is to demonstrate how a microemulsion treatment effectively dissolves common oilfield scales, such as calcium carbonate and barium sulfate, while simultaneously reducing the carbon footprint and operational costs associated with traditional workover operations. The scope includes a comparative analysis of the new method against conventional scale removal techniques. Our approach involves the synthesis and laboratory testing of a thermodynamically stable, oil-in-water microemulsion. This blend, composed of specialized surfactants, co-surfactants, and a chelating agent, was designed to achieve ultra-low interfacial tension to penetrate and solubilize complex scale deposits. We performed a series of dissolution efficiency tests on real-world scale samples, mimicking downhole conditions of 300 deg feh. This was followed by a lifecycle analysis and a financial comparison to quantify the reduction in CO2 equivalent emissions and operational costs compared to rig-based interventions. The field deployment procedure using a coiled tubing unit is also outlined. Our laboratory results demonstrated that the microemulsion achieved a 95% dissolution efficiency for calcium carbonate and a 90% efficiency for the more challenging barium sulfate within 24 hours. These results significantly outperform conventional acidic treatments, particularly against recalcitrant barium sulfate. The lifecycle analysis concluded that our rigless methodology can reduce the carbon footprint of scale removal operations by up to 80% compared to traditional workover rigs. The financial comparison revealed a 50-70% cost reduction per intervention. We conclude that this innovative, rigless microemulsion technology offers operative and cost-effective solution for sustaining production in mature fields while directly contributing to the industry's decarbonization goals. This paper provides a new, technically viable framework for simultaneously tackling production decline from scale and the carbon intensity of workover operations. By presenting a proven rigless microemulsion solution, it adds crucial, data-supported knowledge to the industry's efforts to enhance efficiency and meet its environmental obligations in the energy transition era.