Uso da fibra de coco tratada com microemulsão como material particulado em fluido de combate a perda de circulação

Abstract

Drilling fluids have a fundamental importance on the development of petroleum operations, since they are responsible for vital functions that ensure the success of the operation. Responsible for 10% of the well total cost and used in large volumes, adverse situations with the fluid become totally undesirable. The fluid loss during drilling has a very significant effect and is considered one of the largest and most challenging problems of the oil industry. In order to reduce such losses and take them to an acceptable level, are used as agents and particulate materials filtered controllers with varied size referred to as Lost Circulation Materials-LCM. In this work, was studied the use of coconut fiber treated and untreated with Microemulsion as an LCM, in a conventional fluid in order to observe your influence on the volume of filtrate and rheology. Furthermore, it was considered the change in the fiber structure by scanning electron microscopy (SEM), Thermogravimetry (TG), x-ray diffraction (XRD) and x-ray fluorescence (XRF). In order to analyze of the behavior of the fibers in the volume of filtrate and rheology of the fluid through the filtered API and the OFFITE viscometer, respectively, was developed a factorial trial planning 2 ² with triplicate in center point by varying the mass of clay and the mass of coconut fiber. The results showed that the chemical fiber treatment altered its properties and composition, through the filling of pores, observed in MEV, later mass burning, observed in TG and change in crystallinity, according to the results of the DRX. For the volume of filtrate, the coconut fiber without treatment showed no statistically significant results, however the fiber treated began to interact with the water-based fluid used and was statistically significant in the control of filtered, showing a better performance with 9 (g) of fiber and 10 (g) of clay. Viscosity results showed that there were chemical interactions between clay and coconut fiber treated, thereby changing the values of the plastic viscosity and apparent. In this way, the coconut fiber treated fluid presented itself as a good alternative for the control of loss on initial drilling zones.