Avalia??o de correla??es para determina??o de par?metros de escoamento de pasta de cimento

• Autor(a) principal: Santos, Deividson Silveira dos
• Data de Publicação: 2013
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações da UFRRJ
• Texto Completo: https://tede.ufrrj.br/jspui/handle/jspui/3419
• topic: Cimenta??o; perda de carga; pasta de cimento; loss of cargo; cement slurry; Cementation; Engenharia Qu?mica

During the well construction process, fluids are used in all stages of the well formation. The lubrication of the drill bit, the well pressure control, removal of cuttings, amongst others, are some functions of the drilling fluids in the drilling process. The use of the cement slurry in its turn is intended to promote the hydraulic seal and isolate the rock traversed, allowing a reliably drilling operation. This work is the result of a line of research that studies the flow of cement paste and aims to assess the correlations found in the literature for the prediction of pressure drop in the flow of the folder. Moreover, a statistical study of the equations used in the flow of cement slurries used in the cementing process was made. The work is divided into two distinct parts. In the first was evaluated the flow characteristics of a lightweight cement slurry containing microspheres. The second stage is performed the statistical analysis of simulations gathering the data obtained in this work with those determined for Para?so (2011), in studying the flow said heavy folders, folders and also medium, studied at the Laborat?rio de Escoamento de Fluidos, UFRRJ. To obtain the experimental tests were performed load loss in the three cement pastes with solids concentrations that altered the flow of the same and were used in the cementing operation of oil wells. The slurries formulations were provided by CENPES / PETROBRAS. To develop the proposed study, a flow loop was built for the slurries? flow. This experimental flow loop consists of a system operating in a closed circuit, composed of galvanized iron tubes, a helical pump of 25HP (GEREMIAS/WEATHERFORD), and other equipment. The experimental sections were composed of a circular tube 1" in diameter and three concentric annulars with the following outer to inner diameter ratios: Annular I (2? - 1 ??), Annular II (1 ?? - 1?), and Annular III (1 ?? ? 3/4?). The experiments were made at three different temperatures: 15, 25, and 60?C. The rheological data were obtained in a FANN-35A viscometer. We analyzed three rheological models, three hydraulic diameter correlations, nine friction factor correlations, and five critical Reynolds equations. We obtained data of the laminar, transitional and turbulent flow. The rheological model of Herschel-Buckley, the hydraulic diameter correlation DH2, and the Ellis and George (1977) correlation obtained the best results. The equations Johnson (1959) and Mishra and Tripathi (1971) proved to be more efficient in all three cases.