Study on Start-Up Process of SAGD by Solvent: Experiment Research and Process Design
Table 3
Comparison of the time required for the temperature between the two horizontal wells to rise to 80°C.
No.
Process program
Process plan
1
Steam circulation well washing
Inject steam to circulate and displace the remaining drilling fluid and washing fluid in the well. The cycle time is 1 d.
2
Prestage plug solvent
Injecting wells and production wells simultaneously with 35 m3 of solvent at the maximum allowable bottomhole pressure
3
Solvent soaking
12 days off, let the solvent soak and mix in the formation
4
Steam cycle
Bringing a fluid that can be flowed after being soaked in a solvent, the steam is further circulated at a high injection amount until it can be injected into SAGD production.
5
Pre-SAGD and fluid connectivity test
Injecting steam into the well, producing wells, monitoring the bottom temperature and return conditions of the production well, and determining whether the fluid between the two wells is connected
