| 摘要 |
The invention provides a steam flooding assisted gravity drainage oil extracting method, which includes the steps: drilling a vertical well and a horizontal well; simultaneously injecting steam into the vertical well and the horizontal well; simultaneously extracting oil from the vertical well and the horizontal well; judging whether a next oil extracting phase is proceeded or not; continuously injecting steam into the vertical well with a first steam injecting amount, and continuously extracting oil from the horizontal well until the injecting and extracting difference achieves a preset value; continuously injecting steam into the vertical shaft with a second steam injecting amount, and continuously extracting oil from the horizontal well until the daily fluid production rate of the horizontal well drops to a preset value; and stopping injecting steam into the vertical well, and continuously extracting oil from the horizontal well until oil extracting stop conditions are met. By means of the steam flooding assisted gravity drainage oil extracting method, oil displacement efficiency can be improved, oil drainage speed can be increased, recovery ratio for heavy oil development can be increased, and recoverable reserve can be increased. |
