There are two combustion states of in-situ combustion, namely low-temperature and high-temperature oxidation of crude oil. To address the problems of unstable low-temperature oxidation process, low thermal efficiency and low recovery percent, indoor physical simulation and numerical simulation experiment were carried out with the in-situ combustion in Du 66 Block as the study object, a kinetic model of in-situ combustion reaction was established through the historical fitting of oxygen consumption and different-component exhaust gas data, and a transform boundary chart of high- and low-temperature oxidation was constructed based on the initial temperature and ventilation intensity at the front edge of the in-situ combustion. The results of the study showed that in high-temperature oxidation, the apparent H/C atomic ratio of crude oil in Du 66 Block was 0.5 to 2.0 and the CO/CO2 volume ratio was 0.13 to 0.40; the combustion during low-temperature oxidation was unstable and easily extinguished; the initial temperature and ventilation intensity at the critical front edge of high- and low-temperature oxidation of in-situ combustion in Du 66 Block were 280°C and 1.0 m3/(m2·h) respectively; if lower than or close to the critical value, there may be a risk of low-temperature oxidation or even extinction; development countermeasures were put forward based on in-situ combustion in Du 66 Block, including maintaining the minimum ventilation intensity and stratified in-situ combustion. The study provides a theoretical basis for the engineering design of in-situ combustion reservoirs.
Hu Changhao
. Study on Transform Boundary of High-temperntwe and Low-Temperature Oxidation in In-situ Combustion[J]. Special Oil & Gas Reservoirs, 2021
, 28(5)
: 86
-92
.
DOI: 10.3969/j.issn.1006-6535.2021.05.012
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