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All Journal Journal of Geoscience, Engineering, Environment, and Technology
Lian, Dan
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Earth & Planetary Sciences Engineering Environmental Science Physics

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The Effect of Microsilica on Expanding Cement for Micro-Annulus Problem in Gas Migration Hamid, Muhammad Chairafy; Wardana, Raka Sudira; Pattinasarany, Adrian; Lian, Dan
Journal of Geoscience, Engineering, Environment, and Technology Special Issue from The 2nd International Conference on Upstream Energy Technology and Digitalization
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2025.10.1.1.24440

Abstract

Gas migration through cement slurry and micro-annuli remains a major well integrity. Improper cementation can lead to micro-annulus formation, enabling gas leakage and increasing blowout risk as downhole pressure decreases. Microsilica has been widely used as an anti-gas migration additive due to its ability to reduce permeability and improve cement stability; however, its effect on expanding cement systems has not been fully evaluated. This study investigates the influence of microsilica on the physical and mechanical properties of expanding cement slurry and its interaction with conventional expanding additives. Three slurry formulations—base slurry with microsilica, base slurry with expanding additive, and a combined microsilica–expanding additive system—were prepared and tested following API RP 10B procedures, including density, rheology, fluid loss, free water, thickening time, compressive strength, and expansion ring testing. Results show that microsilica provides beneficial effects by reducing fluid loss, eliminating free water, increasing compressive strength, and enhancing post-set expansion performance when combined with expanding additives. However, microsilica also increases slurry viscosity and shortens thickening time, potentially affecting pumpability and placement. Expansion ring tests indicate that the combined microsilica–expanding additive slurry exhibits the highest expansion (0.446% at 96 hours), whereas cement with microsilica alone shows initial shrinkage before gradual expansion. Overall, microsilica acts as a complementary additive that improves the performance of expanding cement but requires careful optimization to avoid negative impacts on rheology and setting behavior. The findings highlight the importance of additive balancing in designing cement systems for gas-migration-resistant well completions.
Comprehensive Analysis of Latex Additives for Zonal Isolation and Gas Migration Control Pattinasarany, Adrian; Lian, Dan
Journal of Geoscience, Engineering, Environment, and Technology Special Issue from The 2nd International Conference on Upstream Energy Technology and Digitalization
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2025.10.1.1.24493

Abstract

This paper examines the performance of a latex additive in a 7-inch production casing cementing operation, focusing on its role in improving zonal isolation and preventing gas migration. The study uses data from, Cement Hydration Analyzer (CHA), Static Gel Strength Analyzer (SGSA), Cement Bond Logs (CBL), and Ultrasonic Imaging Tools (USIT) to assess the latex additive's impact on cement bond quality and integrity. Primary cementing practices are critical for ensuring well integrity and productivity. Latex additives strengthen the bond between casing and formations, improving zonal isolation and gas migration control. These additives enhance the mechanical properties of cement slurries, creating a resilient seal for hydrocarbon production demands. Advanced technologies like CHA and SGSA provide real-time monitoring of the cement hydration process, offering valuable views into mechanical property development and potential weaknesses in preventing fluid migration. The study shows how latex additives optimize hydrocarbon extraction, safeguard well integrity, and develop new methods to mitigate gas migration. It is concluded that using latex additives, combined with simulations to analyze displacement efficiency, flow potential, and critical static gel strength, enhances cementing operations and prevents gas migration. This approach may also lead to cost savings by potentially eliminating the need for ultrasonic logging in future latex jobs.
Co-Authors Hamid, Muhammad Chairafy Pattinasarany, Adrian Wardana, Raka Sudira