Paper: Case History of CO2 Remedial Treatments Improved Production In The Wolfcamp Intervals, Val Verde Basin, West Texas

Fluid cleanup effects have hampered stimulation success in many tight, naturally fractured sandstone reservoirs. In some cases, cleanup problems affect not only short-term but long-term reservoir deliverability. The Wolfcamp intervals in Val Verde Basin, West Texas are tight, naturally fractured reservoirs and exhibit better responses to CO2 energized fluids than non-energized fluids. We will present data from a case study of several wells in the Wolfcamp intervals where 100% COz treatments have increased productivity in both initial and remedial applications. We will discuss how production was increased by 100% CO2 treatments in wells where non-energized and energized fluids were previously pumped. Then we will discuss treatments where 100% CO2 was effectively to propagate a fracture and transport proppant. An economic evaluation will be presented on the 100% CO2 remedial treatments in the Wolfcamp intervals. Finally operational concerns and the equipment set up for 100% CO1 and CO2 proppant treatments will be discussed.