The gravity fire flooding is an important replacement method after steam injection in medium-deep thick heavy oil reservoirs. In order to clarify its sweep characteristics and control technology, a numerical simulation model of gravity fire flooding was established based on the relevant data of the gravity fire flooding block in Liaohe Oilfield, and the zonal characteristics, production change law and production control conditions of gravity fire drive were studied. The research shows: The oil production of horizontal wells through gravity fire flooding is mainly caused by vertical flow due to the increase of vertical upward mobility; the production dynamics of gravity fire flooding can be divided into four typical stages: establishment of cavity connectivity, lateral spreading effectiveness, stable combustion for oil drainage, and breakthrough decrement. The minimum gas injection rate can be calculated according to the formula of the ellipsoid model, and it is better to use 2 times of the theoretical calculated gas injection rate for production design; setting a certain back pressure can effectively suppress gas channeling to achieve balanced expansion of the fire line, and the optimal discharge-injection ratio is 1. The research results provide a basis for guiding the engineering design of gravity fire flooding mines.
Yu Xuefeng
. Characteristic Analysis and Control of Gravity Fire Flooding Based on Numerical Simulation[J]. Special Oil & Gas Reservoirs, 2022
, 29(5)
: 88
-93
.
DOI: 10.3969/j.issn.1006-6535.2022.05.012
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