CONICET | Buscador de Institutos y Recursos Humanos

Drilling fluids play critical role in oil and gas drilling operations, such as cleaning and stabilizing of well, suspending and carrying out cuttings, reducing friction between formation and drilling tools, among others. Successful drilling operations are highly dependent on the selection of fluids with pre-specified properties, which are mainly determined by their rheological and filtration properties [1]. On the basis of the composition, fluids are classified in two groups: water-based muds (WBMs), and oil-based muds (OBMs). OBMs exhibit high performance but present some disadvantages related to the environmental impact, cost and negative effects on cementing. From an environmental point of view, the use of WBMs represents an attractive alternative. In recent years, different natural polymers, synthetic polymers and inorganic nanoparticles have been used as additives in WBMs to improve rheological and filtration properties. Nowadays, there is an increasing interest in designing new formulations for WBMs using additives from renewable and biodegradables sources. In this sense, the use of cellulose nanofibrils (CNF) is a promising alternative. CNF is obtained from different resources, such as wood, plants, marine animals, algae and bacteria and processed by using only mechanical treatments or combining mechanical treatments with enzymatical or chemical pre-treatments.In this work the use of cellulose without lignin (CNF1) and cellulose with lignin (CNF2) as replacement of xantham gum (XGD) in WBMs for Argentina shale was studied. The effect of the CNFs composition on the rheological behavior and filtering properties was analyzed. The rheometric characterization of the fluids was complemented with the structural analysis and rheological model.

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