公开(公告)号：US20180266222A1

公开(公告)日：2018-09-20

申请号：US15925039

申请日：2018-03-19

Applicant: CONOCOPHILLIPS COMPANY

Inventor： Medhi BAHONAR ,  Danial Kaviani

IPC: E21B43/24 ,  C09K8/592

CPC classification number: E21B43/2406 ,  C09K8/592 ,  E21B43/2408

Abstract: The invention relates to a system and method for steam assisted gravity drainage of hydrocarbons having increased solvent recovery thus improving the economics of steam-only injection processes such as steam assisted gravity drainage while reducing environmental impact. Embodiments aid the condensation of solvent either by shutting-in or reducing the steam injection or by injecting a secondary lighter and cheaper solvent post solvent-steam co-injection, after which, normal steam injection at optimized operating conditions is restarted and continued until blow down while primary solvent recovery is continued, thus significantly accelerating and maximizing the recovery of solvent injected without affecting the long term cumulative bitumen production.