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JOHNSON, RANDY J., Callon Petroleum Company, Natchez, MS

ABSTRACT: Recent Horizontal Drilling in Lockhart Crossing Field, Livingston Parish, Louisiana: Its impact on Geological Interpretation

Recent horizontal completions drilled to date by Callon Petroleum Company in the Lockhart Crossing field have optimized production in the lower Eocene First Wilcox sandstone, a 40-45-ft-thick marine bar composed of very fine- to fine-grained glauconitic sand. The First Wilcox sandstone reservoir has produced a cumulative of 16 MMBO and 17 BCFG from a total of 40 wells on the Lockhart Crossing field since 1982.

Well-site geology was a key factor in these successful horizontal completions because mud logs, electric logs, and cores were not taken for these well bores. Over 3000 ft of drilled cuttings, taken at 10-ft intervals, were examined to maintain the drilling well bore near the top of the First Wilcox sandstone, which has the highest degree of permeability and porosity. By drilling horizontally, we encountered First Wilcox sandstone structure that was not previously mapped using existing subsurface well control.

Callon's International Paper Company (IPCO) #6 well, the first of three horizontal wells drilled in the Lockhart Crossing field, flowed at a rate of 527 BOPD and 400 MCFGD with a final tubing pressure of 650 lb from the First Wilcox Sandstone in March 1992. The IPCO #6 horizontal well, located upthrown to a down-to-the-south fault, has produced 147 MBO an should adequately drain this area of the reservoir.

AAPG Search and Discovery Article #90989©1993 GCAGS and Gulf Coast SEPM 43rd Annual Meeting, Shreveport, Louisiana, October 20-22, 1993.