Bypassed Pay in a Carbonate
Making a good well better
The Hummingbird pool has produced oil for over 40 years. This example well, 102-07-26-02-19 w2, was spudded in February, 1960. On the initial completion the well was perforated at the base of the Mississippian Ratcliffe and the base of the Oungre formations. Initial production was about 250 barrel of oil per day (BOPD) and 25 barrels of water per day (BWPD). By the summer of 1985 it was producing about 50 BOPD and 5 BWPD, and had cumulative production of over a half million barrels of oil. A production plot of daily versus cumulative oil production shows that ultimate oil recovery from this well should be 0.8 million barrels of oil.
7-26 was a good well by North American standards.
During a routine pump repair in the summer of 1985 Roke’s Quad Technology data was recorded across the Ratcliffe and Oungre formations. The resulting log showed significant amounts of oil remaining in porous, non-perforated intervals. This log data prompted the operator to perforate and acidize five more intervals in the producing horizons. Resulting production peaked at about 800 BOPD and 80 BWPD.
Currently (2008) the well is producing 30 BOPD and 300 BWPD, and has cumulative production in excess of 1.6 million barrels of oil. The daily versus cumulative oil production plot now shows that the additional oil produced is incremental, not accelerated production.
7-26 is now a very good well by North American standards!