Abstract
Asphalt profile control is an effective method, which can further improve oil recovery of reservoir polymer flooded, it has a lot of advantages including high strength profile control, seal strata formation efficiency, low cost and no pollution, but there has not a perfect evaluation system for its development mode. The effect of different concentration, injection rate, radius of profile control, the timing of profile and segment combination way on the oil displacement effect of the asphalt profile control were researched using numerical simulation method on actual typical well area in Daqing oilfield, and the mechanism of asphalt profile control was studied in detail. According to the results of laboratory test, the largest Enhanced Oil Recovery (EOR) of asphalt was obtained at injection concentration 4000 mg/L, and the best combination was “high–low–high” concentration slug mode. According to the results of numerical simulation, the best concentration, injection rate, radius of profile control and injection timing were 4000 mg/L, 0.15 PV/a (Pore Volume [PV], m3), 1/2 of well spacing and 96% water cut in single slug of asphalt injection system, when the injection condition was multiple slug, the “high–low–high” slug combination mode was the best injection mode. These results could provide effective development basis for asphalt profile control after polymer flooding in thick oil layers.
Highlights
As the oilfield enters the extra-high water cut stage, both water flooding and polymer flooding oilfields are facing the problem of vertical or planar injection fluid inrush caused by heterogeneity (Ma et al, 2019)
The refinement development of oilfield requires increasingly strengthen profile control, the conventional chemical profile control agents such as gel (Hoefner et al, 1992; Pinho de Aguiar et al, 2020; You et al, 2011), volume expansion grain (Salomao and Grell, 2001), polymeric microsphere (Lakshmi et al, 2013; Lin et al, 2015), and composite ion (Liu et al, 2005) have been proposed by oil field workers to adapt to different reservoirs or development conditions, but have not been able to meet the development needs
Asphalt profile control method began to be found gradually (Fu and Sheng, 1999; Ribeiro et al, 2009; Xiao et al, 2014), it refers that the asphalt particle
Summary
As the oilfield enters the extra-high water cut stage, both water flooding and polymer flooding oilfields are facing the problem of vertical or planar injection fluid inrush caused by heterogeneity (Ma et al, 2019). As an effective method of plugging high-permeability layers, could expand sweep volume of the medium and low permeability layers, and improving the development effect, has been used as an indispensable method for oilfield development. Asphalt profile control method began to be found gradually (Fu and Sheng, 1999; Ribeiro et al, 2009; Xiao et al, 2014), it refers that the asphalt particle
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