masterThesis
Avaliação de diferentes métodos para determinação de parâmetros reológicos em pastas de cimento para poços HPHT
Fecha
2019-02-18Registro en:
ARAÚJO, Victor Moreira. Avaliação de diferentes métodos para determinação de parâmetros reológicos em pastas de cimento para poços HPHT. 2019. 73f. Dissertação (Mestrado em Ciência e Engenharia de Petróleo) - Centro de Ciências Exatas e da Terra, Universidade Federal do Rio Grande do Norte, Natal, 2019.
Autor
Araújo, Victor Moreira
Resumen
Temperature is an important factor for the determination of rheological properties of a cement
slurry. The American Petroleum Institute (API) recommends in its RP 10B-2 standard that
rheological parameters of cement slurries, at bottom hole circulation temperature (BHCT)
greater than 190 °F, must be determined in two steps: (i) the slurry must be conditioned at
BHCT conditions using a pressurized consistometer and (ii) cooled down to 190 °F and
depressurized to atmospheric conditions so an atmospheric viscometer can be used. In this
work, rheology tests of HPHT (High Pressure High Temperature) slurries were carried out on
a pressurized viscometer, which allows the tests to be entirely executed at the BHCT conditions.
This way, there was no need for cooling, depressurizing and transferring the slurry between
equipments. The results were compared to what was obtained with the API RP 10B-2
procedures. Significantly different rheological parameters were observed between these two
methods. In addition, hydraulic simulations were performed to evaluate the impact of those
differences on cement slurry displacement in a cementing job. The simulation revealed that, for
the evaluated scenarios, the difference between the rheological parameters obtained with each
method influenced the result of the operation, considering indicators such as the maximum
equivalent circulation density (ECD) and slurry displacement efficiency.