Function Synergy of a New Type of Fluid Loss Additive Formula for Comprehensive Performance of Oil Well Cement

Abstract:

With 2-acrylamido-2-methylpropanesulfonic acid (AMPS) units on polymeric additive, additive showed high effectiveness used for oilwell cement. However, due to chemical absorption and chelation mechanism of AMPS units to Ca²⁺ hydrating cement particles, adding of AMPS type additives caused delay of cement hydration process. In this research, AMPS type fluid loss additive, named as FLA A additive, was studied for its hydration delay side effect to class G Portland cement. Furthermore, polyvinyl alcohol (PVA) polymer, modified by glyoxal and boric acid, called as PVAGB was used as a synergistic functional additive to AMPS type polymer fluid loss additive to research on hydration delay problem of AMPS type additive to cement and the improvement for the effectiveness of AMPS type fluid loss additive. When AMPS type additive showed functional drawbacks, with more disordered chemical absorption and chelation behaviors to Ca²⁺ hydrated cement particles rather than constituting a completed and superior fluid loss control system, and this kind of modified PVA polymer was utilized for making up its failure. New compound additive formula, PVAGB/FLA A fluid loss additive formula, was investigated, which showed superior and more stable fluid loss control ability, i.e. about 50 mL at 30°C and 108 mL at 80 °C with just 0.2 % BWOC (weight percentage by weight of cement) PVAGB and 0.5 %BWOC (weight percentage by weight of cement) FLA A addition. In addition, within 28-day curing period, cement samples showed a healthy compressive-strength development with no less than 28MPa after 7-day curing period rather than failure due to cement strength retrogression. With scanning electron microscope (SEM) analysis, PVAGB showed accelerating effect to cement hydration process, in which hexagonal plate Ca(OH)₂ crystal and aggregated product of C-S-H gel were formed when compared with pure cement and cement with FLA A additive added.

• Periodical: Materials Science Forum (Volume 993)
• Pages: 1319-1332
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.993.1319
• Online since: May 2020
• Authors: Hao Wang, Ming Li*, You Zhi Zheng, Tao Gu
• Keywords: 2-Acrylamido-2-Methylpropanesulfonic Acid Sodium Salt (AMPS-Na), Cationic Polyvinyl Alcohol (PVA) Polymer, Fluid Loss Additive, Oil Well Cement

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