Buda-Georgetown Lime Play

Production Decline

Most wells in the play show a hyperbolic decline with high Initial Potentials and steep decline in the first two years; however, the decline begins to flatten to 10 to 20 percent beyond year three. Figure 3 shows the decline curve for the Sage Energy Pack Unit 1H in ICI Field. The well shows an initial steep decline, with an Initial Production rate of 650 BOPD for the first full month of production. This curve is typical of some of the better wells within the field.

A decline at the same field, the Belco Lillie Mae Dickson 1H, shows how a well in the play can respond to a slick-water fracture treatment ( Figure 4). After the treatment, the rate increased and new reserves were added beyond the initial completion.

Hydraulic fracture treatments are not common in the trend. Even though slick-water fracs and “dendritic” fracs using diverters are common in the Austin Chalk, they are not often applied in the Buda-Georgetown. This is likely due to the fact that fracture stimulations yield marginal results where there is little or no matrix porosity, or micro-fracturing. But the area where matrix porosity occurs in the Georgetown can show good results from hydraulic fracture treatments.