Estudo experimental da combustão molhada na recuperação de oleo pesado / Experimental study of the wet combustion on heavy oil recovery

AUTOR(ES)

Lucia Ines Bonet Gonçalves

DATA DE PUBLICAÇÃO

2010

RESUMO

One way to improve the performance of the oil recovery method, known as dry forward in situ combustion, is to inject water either simultaneously or intermittently with the air, named as wet forward in situ combustion. The specific heat of the dry air is considerably lower than that of water, such that water may render a better transport of the heat generated by the combustion front, leading to a reduction of the amount of air required to sweep a specified reservoir volume. The objectives of the present work are to evaluate, through combustion tube tests, the wet combustion performance for a heavy oil (12,88°API) from Espírito Santo Basin and to obtain helpful combustion parameters for the design of a future field pilot. For this, four combustion tube tests were performed (one dry combustion and three wet combustions), using the experimental apparatus in the Laboratory of Thermal Methods of Recovery from the Department of Petroleum Engineering at UNICAMP, and it was also developed a thermal simulation model to help on the prediction of the lab tests, using a commercial simulator. The experimental results showed that the wet combustion process is stable for the studied oil, since the experimental conditions are kept under control. For the studied water-air ratios (1,00 x 10-3 m3/m3; 0,56 x 10-3 m3/m3 and 0,33 x 10-3 m3/m3), the presence of water decreases the fuel deposition, increasing the combustion front velocity and decreasing the amout of the air required. A reduction in the average temperature of the combustion front (from 493 ºC to 460 ºC) was observed, but still, in the range of the high temperature oxidation reactions. The results of the simulation model showed an adjustment close to the experimental ones regarding the temperature profile

ASSUNTO(S)

heavy oil engenharia de reservatorio de oleo combustão petroleos pesados thermal oil recovery petroleum engineering engenharia de petroleo combustion recuperação termica do petroleo oil reservoir engineering

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