[AccessD] 3 month moving total

I was wondering if it is possible to create a 3 month moving total in a query. I have had no luck in finding an answer in any searches. Below is some sample data and what the results should be. Thanks for any ideas.

SAMPLE DATA
Well       Date                      Oil
1              1/1/2012              10
1              2/1/2012              14
1              3/1/2012              8
1              4/1/2012              11
1              5/1/2012              9
1              6/1/2012              13
1              7/1/2012              12
2              1/1/2012              7
2              2/1/2012              20
2              3/1/2012              18
2              4/1/2012              5
2              5/1/2012              9
2              6/1/2012              10
2              7/1/2012              14

INTENDED RESULTS
1              3/1/2012              32
1              4/1/2012              33
1              5/1/2012              28
1              6/1/2012              33
1              7/1/2012              34
2              3/1/2012              45
2              4/1/2012              43
etc