Combining production data

[areed145]

I have a data set of monthly oil production data from many wells in a field from different date ranges. I need to combine the different parameters from each well somehow to create field totals for every month. Is this possible short of adding them all up manually? I have attached the spreadsheet for reference. Each well has its own sheet. The result would look just like one of the sheets, but with totals from all the wells. This is a project for class and I cannot figure out how to accomplish this. Thanks in advance.