Mixed mining method capable of improving recovery ratio of thick oil in shallow oil reservoir
A mining method and recovery technology, applied in the field of mixed mining, to achieve the effect of increasing oil production
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[0014] An embodiment of the present invention is described below.
[0015] A mixed production method for enhancing heavy oil recovery in shallow oil reservoirs, comprising the following steps:
[0016] 1) In the shallow oil reservoir area, set three horizontal wells with a depth directly below the oil reservoir. The steam injection and oil production casing strings are run in the middle horizontal well. The three horizontal wells are located on the same horizontal plane below the oil reservoir. Dig the well vertically downward, and when the depth of the well reaches the bottom of the oil reservoir, turn to excavate the horizontal well; the horizontal distance between the three horizontal wells should not exceed 50m, and 10-30m is the most suitable;
[0017] 2) First, inject high-temperature and high-pressure steam into three horizontal wells at the same time by using the steam stimulation method, then close the three horizontal wells, let the steam heat in the three horizontal...
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