More than 4,000 horizontal wells have been drilled in the prolific Austin Chalk play which now stretches from southwest Texas to eastern Louisiana, at depths between 7,000' and 15,000' (2,250- 4,840 m). Although initial production rates can exceed 1,000 barrels of oil per day with cumulative production of 1 million barrels of oil, 30-40% of all horizontal wells produce less than 150,000 barrels and are not economically viable. Economic success in this play hinges on choosing and staying in the correct target horizon.

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