This is a good question for www.amien.org. Please register at that site and post your question in the Sizes and Grounds Discussion Forum or the Oil Paints Discussion Forum.
To give you the short reply, no, you should not expect the oil paint to separate from an acrylic primed canvas.On the other hand, one must be sure to apply the 'fat over lean ' principle.And of course, the medium used would be another factor to consider. k