Simple pumping gets only about 30% of the oil in a reservoir rock out of the ground. To increase the pumping/recovery rate, what kind of secondary recovery technique can be used?

a. Force the steam into the ground nearby (the steam heats the oil in the ground, making it less viscous)
b. Use new drill bits
c. Hydrofracturing (or fracking)
d. Use a more powerful pump
e. Both a and c


Ans: e. Both a and c

Environmental & Atmospheric Sciences

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