Method for enhancing recovery of heavy oil reservoirs with hot nitrogen foam after multiple rounds of steam huff and puff
A heavy oil reservoir, hot nitrogen technology, applied in the direction of production fluid, earthwork drilling, wellbore/well components, etc.
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Embodiment 1
[0085] To exploit multiple rounds of steam huff and puff late stage heavy oil reservoirs, the specific exploitation steps are as follows:
[0086] (1) Pretreatment slug: open the first injection port 71 of the injection well 7, communicate with the discharge port of the first surface injection device 5 in the nitrogen supply unit 10, close the The second injection port 72 and the third injection port 73 inject the pressurized hot nitrogen gas from the first surface injection device 5 through the injection well 7 and then through the vertical well 8 into the formation, wherein The temperature of the hot nitrogen is 300° C. and the concentration is 99%.
[0087] (2) Foam solution slug: open the second injection port 72 of the injection well 7, and communicate with the foaming agent aqueous solution supply unit 40, close the first injection port 71 and the third injection port Inlet 73, the foaming agent aqueous solution from the second surface injection device 10 is injected in...
Embodiment 2
[0093] To exploit multiple rounds of steam huff and puff late stage heavy oil reservoirs, the specific exploitation steps are as follows:
[0094] (1) Pretreatment slug: open the first injection port 71 of the injection well 7, communicate with the discharge port of the first surface injection device 5 in the nitrogen supply unit 10, close the The second injection port 72 and the third injection port 73 inject the pressurized hot nitrogen gas from the first surface injection device 5 through the injection well 7 and then through the vertical well 8 into the formation, wherein The temperature of the hot nitrogen is 320° C. and the concentration is 97%.
[0095] (2) Foam solution slug: open the second injection port 72 of the injection well 7, and communicate with the foaming agent aqueous solution supply unit 40, close the first injection port 71 and the third injection port Inlet 73, the foaming agent aqueous solution from the second surface injection device 10 is injected in...
Embodiment 3
[0101] To exploit multiple rounds of steam huff and puff late stage heavy oil reservoirs, the specific exploitation steps are as follows:
[0102] (1) Pretreatment slug: open the first injection port 71 of the injection well 7, communicate with the discharge port of the first surface injection device 5 in the nitrogen supply unit 10, close the The second injection port 72 and the third injection port 73 inject the pressurized hot nitrogen gas from the first surface injection device 5 through the injection well 7 and then through the vertical well 8 into the formation, wherein The temperature of the hot nitrogen is 350° C. and the concentration is 95%.
[0103] (2) Foam solution slug: open the second injection port 72 of the injection well 7, and communicate with the foaming agent aqueous solution supply unit 40, close the first injection port 71 and the third injection port Inlet 73, the foaming agent aqueous solution from the second surface injection device 10 is injected in...
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