Oil Well Cement Modified with Bacterial Nanocellulose

CHRISTIAN MARCELO MARTIN; IGNACIO ZAPATA FERRERO; PATRICIA CERRUTTI; ANALÍA VAZQUEZ; DIEGO MANZANAL; TERESA M. PIQUE

Washington

Congreso; International Congress of Polymers in Concrete; 2018

During oilwell completion, cement slurries are pumped into the annular area between the casing and the borehole. These are used to contain and prevent corrosion and erosion of the casing, to hydraulically isolate the various formations through the borehole, avoiding the filtration of pollutants in aquifers, loss of productivity, etc. Oilwell cementing is a complex task. Incorrect isolation or loss of circulation causes damages, both economically and environmentally. Cement slurry is a mixture of cement, water, and additives. In particular, high-performance materials are used for oilwells. It is further characterized by having a high w/c ratio and a relatively low viscosity. The aim of this work is to optimize the performance of the slurries with the addition of bacterial nanocellulose (BNC). In order to study the effect of BNC in cement slurries, its properties were studied in fresh and hardened state. In particular, density, fluidity, hydration degree, and mechanical properties were evaluated. The results confirm the positive effect of the addition of BNC to the slurry, presenting low percentage of free liquid and an increase of the compressive strength.