Eventos Anais de eventos
ENCIT 2022
19th Brazilian Congress of Thermal Sciences and Engineering
STUDY OF NONAQUEOUS DRILLING FLUIDS AS A BARRIER ELEMENT
Submission Author:
Julia da Silva , SP
Co-Authors:
Julia da Silva, PAULO RIBEIRO, José Ricardo Pelaquim Mendes
Presenter: Julia da Silva
doi://10.26678/ABCM.ENCIT2022.CIT22-0249
Abstract
The drilling fluid exerts the role of a primary safety barrier in drilling operations, since by exerting hydrostatic pressure against the drilled formation, it prevents the unwanted influx of hydrocarbons into the well. Initially, water-based drilling fluids were applied, but with technological and operational advances and environmental needs for deep and ultradeep drilling, it became necessary to replace such fluid with synthetic-based ones. Despite the numerous benefits associated with synthetic drilling fluids it is difficult to handle natural gas solubility in the nonaqueous phase during a kick event. Until reaching the saturation pressure of the fluid, the influx is almost completely solubilized, becoming practically undetectable at the surface, what is the most critical scenario from an operational safety point of view. The main objective of the present work is to analyze the effect of methane solubility in n-paraffin based fluid, as well as to discuss the consideration of such fluid as a barrier element in two situations: (i) pit gain evaluation for a given amount of gas entering bottomhole; (ii) calculation of the amount of gas that enter downhole for a given kick alarm.
Keywords
drilling fluid, n-paraffin, barrier element, Influx, solubility
