Production from only 64% of perforation clusters

Schlumberger and four operators of Eagle Ford wells in South Texas formed the Eagle Ford Completion Optimization Consortium to investigate improving completion design for horizontal wells through the use of log data. Of particular interest was accounting for the effect of lateral variation in stress along a well to improve the percentage of contributing perforation clusters, termed perforating efficiency, from the 64% average achieved with conventional geometric spacing.

Reservoir quality and completions quality based on logging data

ThruBit logging services were used to efficiently acquire through-the-bit quad-combo logs in 12 wells with minimal interruption to the operators' existing field development workflows. The Sonic Scanner acoustic scanning platform was also run in some wells, with conveyance in cased hole on the TuffTRAC tractor, to determine 3D mechanical properties.

The logging data were used by Schlumberger petrotechnical analysts to conduct a shale evaluation quicklook and assessment of 3D mechanical properties. The results of the petrophysical and geomechanical analyses were used as the completions quality and reservoir quality inputs to the completions advisor of Mangrove reservoir-centric stimulation design software to produce an engineered completion design.

Each of the wells was stimulated according to its customized treatment grouping for similarly stressed intervals, flowed back for cleanup, and logged with the Flow Scanner horizontal and deviated well production logging system conveyed on the MaxTRAC downhole wireline tractor system.