Polímeros à base de óleos de soja para fluidos de perfuração sintéticos.

Abstract

In this work we evaluated two soybean oil-based polymers as filtrate reducers in synthetic N-paraffin-based drilling fluids, aiming their use in oil and gas well drilling. This study was conducted in two stages: First, the characterization of the polymers (POS1A and POS2A) by analysing through the Fourier spectroscopy analysis in transformed infrared (FTIR), optical microscopy (OM), thermogravimetric (TGA), differential thermal ((DTA) and toxicity test; In the second stage, the evaluation of the polymers as filtration reducers by means of the rheological properties (apparent viscosity (AV), plastic viscosity (PV), flow limit (FL)), electrical stability (ES) and HPHT filtrate volume (FV) in accordance with API standards. Still in this stage, as a beacon criterion, we evaluate fluids with no reducers and with standard filter reducer, used by the industry. The results indicate that the POS2A polymer has a higher mean particle diameter and better grain distribution than POS1A. The FTIR spectra of the polymers indicate the existence of carbonylated functions, carboxylic acid and ester. Thermogravimetry indicated that the polymers have good thermal stability. The POS2A polymer presented a very low toxicity and POS1A had no toxicity at all. The fluids showed Bingham plastic flow curves. The polymers had no significant influence on the properties of AV, PV, FL and ES. The presence of polymers in the system reduced the volumes of HPHT filtrates from the fluids and were competitive with the reducer used by the industry, however, they exceeded the results only for fluids with a concentration of 2g of POS2A in the 60/40 oil / water ratio.