Development of Low Carbon Dioxide Intensive Rock-Based Geopolymers for Well Cementing Applications – One-Part Geopolymer

Abstract

Abstract This study aims to reveal the development of short-term mechanical and chemical properties of one-part geopolymers for utilization in well construction and well abandonment activities. These geopolymers are heat-cured rock-based one-part products. The rock-based geopolymer precursor was activated by solid powders of potassium silicate. To enhance the setting time and early strength development of the geopolymers, a small portion of alkaline solution (KOH) was used as an accelerator. Properties of the slurry were characterized through investigating mechanical and chemical techniques. Sonic strength and uniaxial compressive strength of the specimens were studied. In addition, the mineralogy of the solidified samples was analyzed through crystallography to better understand their microstructure. Moderate compressive strength of ca. 7 to 10 MPa within 24 hours and up to 7 days were developed for the investigated one-part geopolymer mixes that have been activated by a solid activator with a modulus ratio of 2.4. One-part geopolymers not only could provide user-friendly slurries, but also can facilitate their commercialization and large-scale application in petroleum and civil engineering sectors.