Eventos Anais de eventos
ENCIT 2016
16th Brazilian Congress of Thermal Sciences and Engineering
ANALYSIS OF MATHEMATICAL CORRELATION FOR INDIRECT DETERMINATION OF LEVEL IN OIL WELLS
Submission Author:
Rodrigo Maciel , ES , Brazil
Co-Authors:
Fabio de Assis Ressel Pereira
Presenter: Rodrigo Maciel
doi://10.26678/ABCM.ENCIT2016.CIT2016-0159
Abstract
Some operations as the indirect determination of oil level in annulus of wells, and level measurement in the annulus space, between well casing and production tubing, are common tasks under the oil production engineering. Specially to obtain necessary data to design lifting systems. The SONOLOG method is devoted to this task, however it demands productions interruption, and the allocation of a considerable handwork. Those factors make this technique relatively expensive. Thereby the objective of this work is to study a theoretical methodology based in mass balance found in literature that aimed to an indirect determination of dynamic level in annulus space of oil well. With this propose, a detailed study on this model was done, using a central composite design technique and ANOVA (Analysis of Variance) to evaluate the sensitivity and influence of the model’s variables in the result. This methodology also allows us to determine ranges of dependents variables that minimize or maximize the response. It also makes this work convenient to understand the limits of this models that might be applied to estimate the fluid level in the annulus of production wells. The application of experimental design methodology and statistical analysis shows that the variable of greatest effect on the well level is the gas flow rate through the annular, then the gas compressibility. It is also noted that the combined effect of these two variables is thirdly in influence on the studied model, it is noted that this effect is more significant than the effect of temperature alone.
Keywords
Keys words: Well’s level, Mass Balance, Design Technique, ANOVA.
