Dimensionamento de revestimento de poço vertical típico usando planilhas eletrônicas e software especialista

Abstract

A casing design consists in the sizing of the pipes and connections that compose the tubular string. This design goes through several phases and requires data regarding the formations where the well will be built. Some of this data is the fracture and pore pressure gradient that are essential for the construction of the operational window, in which it is possible to determine the characteristics of the drilling fluid and the number of phases to which the well will be subjected. With a catalog of available pipes, the designer must calculate the internal and external pressure and axial load resistance, as well as investigate the possible scenarios that may lead the casing to failure. The design for the infallibility of the casing is completed by checking the safety factors. Executing these calculations without a computational tool takes time and attention, time that becomes scarce in the industry. This work was performed in order to design the casing string of an example well found in the literature, calculating its resistances, internal forces and loads with electronic spreadsheets, which is a type of computational tool which is still widely used by engineers, and using an expert software that assists in the design process. The application web Score, developed by the partnership UFAL/LCCV and CENPES/Petrobras, has come to optimize this time, doing in a reliable and precise way the necessary calculations for the dimensioning, facilitating the experience of the project elaboration by the engineer. In this work, the dimensioning of the casings was performed using electronic spreadsheets and the SCORE application, in order to compare and verify the associated error. The relative percentage error was considered minimal, not reaching 0.5% in any of the cases studied, thus generating reliable and efficient results.