Paper: Robert Reyes, John Brown and Gerry Torres, Halliburton Lito Perin and Jamie Lopez, Pioneer Natural Resources

As the gap between supply and demand continues to increase for oil and gas, operators are challenged to develop wells in various economic environments. Because of the cyclical nature of the commodity market and the constant change in commodity prices, operators reduce the overall cost while pursuing more and more challenging wells. One such environment is the "Wolfberry" play in West Texas. Because of the rapid early production decline in these wells they must be drilled and completed as efficiently and cost effectively as possible. This includes drilling to total depth quickly, running affordable casing and successfully achieving zonal isolation in a severely under-pressured environment. Single stage production cementing is a must to maintain the economic viability of these wells. In order to maintain long term stability of the well-bore, cement must be brought above the top of the Spraberry formation (7000" to 7500") from TD (9500"-10,500") without fracturing the well. The Spraberry formation typically has a fracture gradient on the order of 0.43