Four mature wells: 70% more oil, 25% less water

Key results

• Perforated completion
• 70% increase to the total oil rate
• 25% decrease in water
• 37% increase oil production average for a year post stimulation (10,600 bbls)

Challenge

The client operates a field where most wells have been producing for about 40 years. During that time, the oil production has gradually declined, but more recently the water cut has increased significantly.

The client was looking for a way to identify the intervals still producing oil and then stimulate only those oil producing zones. Identifying any oil bearing zones that were missed in the original completion would be an added bonus.

• Depth: 4,500 ft (1,400 m)
• Sandstone reservoir
• Temperature: 150-200 °F (66-93 °C)

Solution

Improve production in a mature reservoir by running a case hole neutron logging tool and the BLUESPARK® stimulation service.

• The client chose 4 wells that showed decreased oil production and increased water cut.
• A cased hole neutron tool was run to identify the oil/water contact in each well. In Well #3, some bypassed pay was also identified.
• The BLUESPARK® tool was run on third-party E-Line and selectively stimulated only the oil-bearing intervals identified by the neutron log (including the bypassed pay zone in Well #3).
• The wells were put back on production and monitored.

Outcome

• All wells saw an immediate increase in oil production.
• The total oil rate for all 4 wells increased 70% for the first 3 months, while the total water decreased by 25%.
• For the entire year post stimulation, the oil production rate averaged a 37% increase vs the 3-month pre-stim rate. An extra 10,600 bbls of oil were produced in that year.