Eventos Anais de eventos
ENCIT 2020
18th Brazilian Congress of Thermal Sciences and Engineering
Thermal Effects on Pressure Changes of Fluids Confined in Pipes
Submission Author:
Ricardo Knesebeck , PR
Co-Authors:
Ricardo Knesebeck, Arthur Gaideski Portela, Alexandre Yuji Imano, Gabriel Merhy de Oliveira, Cezar Otaviano Ribeiro Negrao
Presenter: Ricardo Knesebeck
doi://10.26678/ABCM.ENCIT2020.CIT20-0624
Abstract
In oil and gas exploration, the safety of pipelines sealing is assured by tightness tests. During these tests, the fluid is pressurized inside a pipeline and then confined while its pressure is measured. Authors argue that there are others effects besides leak offs that can cause a pressure drop and a false test failure. These effects can be rheological or thermal, the present paper focus on the latter. An experimental procedure was developed in order to simulate a confined fluid with controlled temperature changes and pressure measurements. It was verified that the thermal effects are, indeed, significant on the pressure change. Two numerical models were developed to predict both temperature and pressure, based on the test results, one that considers a constant volume of fluid and one that considers the deformation of the pipe’s wall. Both models were simulated and compared with experimental results. It was determined that the pipe’s wall deformation is very significant in the pressure prediction and must be included in order to minimize errors, as the isovolumetric model had a relative error of over 60%.
Keywords
thermal expansion, Confined Fluid, Tightness test, pressure, Temperature
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