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Byron Energy makes greater than expected oil find in Gulf of Mexico



Byron Energy have reported that their South Marsh Island Block 71 F4 well in the Gulf of Mexico has hit a total of 91 feet measured depth of net hydrocarbon pay (87 feet true vertical thickness) - a result that exceeds pre-drill expectations.

The SM-71 well was drilled by Byron in the Gulf of Mexico
(Image via Byron)

The well was drilled and evaluated 25% below budget.

The well reached a final, total depth of 8,130 feet in D5 Upper Sand. Byron’s Logging While Drilling (LWD) program logged high-quality reservoir characteristics with an average porosity of 30%, a low water saturation with no observable water contacts. It indicated a mostly likely high gas content oil, though the final hydrocarbon type will not be determined until after the well is placed into production.

They also reported a further 11 feet MD (10 feet true vertical thickness) of hydrocarbons in the J1 sand. The well will be cemented in a manner that will allow the J1 sand to be produced if the company deem it necessary to efficiently produce the reserves attributed to it. 

Byron say that the presence of hydrocarbons in the D5 Upper Sand also validates their model for the entire D5 Sand package as a complex series of amalgamated and stacked sand channels.

“The SM71 F4 well has more than met our pre-drill expectations,” said Byron CEO Maynard Smith.

“Once again, Byron’s RTM seismic data has proven to be an extremely accurate tool for finding oil and gas in the South Marsh Island 71 area. The short cycle time to first production will be of great value to us in our SM58 development program.

“It’s also very gratifying to drill this well under time and under budget. Our team has made huge strides in finding ways to drill better wells and reduce our risk dollars.”

Currently the Enterprise Offshore Drilling 264 (EOD 264) drilling rig is preparing to run a seven-inch casing to the bottom to begin completion operations. 

Frac-pack sand control measures will be used to minimise pressure drawdown across the perforations and allow optimised production rates. Completion operations are expected to take 16 days. 

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Byron Energy makes greater than expected oil find in Gulf of Mexico - Time to read 2 min
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