Experimental and Numerical Investigation on Infilled Vertical Well LASER-Assisted SAGD

In the SAGD process with dual horizontal wells in heterogeneous reservoirs, injection pressure of steam huff-n-puff by infilled interwell vertical is too high, and heat communication between wellpairs long, which leads to a series problems. The solvent-assisted well stimulation (LASER) technology proposed solve problems above. solvent formula was optimized, its key mechanism studied viscosity reduction experiments, multicomponent phase behavior experiments at high temperature pressure, scaled two-dimensional physical experiments. experimental results show that when adding 10% 2# or 3# oil, crude oil can reach 96.65% 96.73%, respectively. HTHP visualized experiment mixture low flash point (volumetric ratio 3 : 2) has excellent solubility stability similar water vapor behavior, so it determined as ideal formula. reducing porous flow resistance, expanding sweep region injected fluid accelerating thermal communication. cycle reduced from 6 3, greatly shortened time. From rate recovery were improved 19.86% 6.3%, Field-scale numerical simulation performed, production performance compared conventional CSS-SAGD investigated, shows into stimulation, cycles reduced, incremental factor 27.3% 13.2%, improvement LASER been validated 4 field practice, long-term prediction result significant potential reservoirs.