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The Wolfcamp play key to Permian Basin production growth

Published by
World Pipelines,

Increased oil and natural gas development in the Wolfcamp play has helped drive overall crude oil and natural gas production growth in the Permian Basin during the past decade. Drilling and completion operations within the Wolfcamp play have been responsible for much of the crude oil and natural gas production growth in the Permian Basin since 2007. As of September 2018, the Wolfcamp accounted for about 1 million bpd of crude oil and 4 billion ft3/d of natural gas. Crude oil production in the Wolfcamp accounts for nearly one-third of total Permian crude oil production and more than one-third of Permian natural gas production.

Rising productivity in the Wolfcamp, like in other plays in the Permian Basin, has been driven mostly by drilling longer horizontal laterals and optimising completions. The length of the horizontal segments, or laterals, in the Wolfcamp increased from an average of 2500 linear ft in 2005 to more than 8500 linear ft in 2018. Well completion efficiency has also improved, primarily by more effectively using sand, or proppant, during the hydraulic fracturing process, as well as by using zipper fracturing – the completion of two or more wells side by side.

The number of producing wells in the Wolfcamp increased from 2200 in 2005 to 7750 in mid 2018. Average initial daily crude oil production per well for the first six months of operation grew from 37 bpd to 515 bpd, and average natural gas production per well for the first six months of operation grew from 0.1 million ft3/d to 2.0 million ft3/d during the same period. EIA expects Wolfcamp production to continue to drive production increases in the Permian region, although pipeline capacity constraints in the region are expected to slow the rate of growth through 2019.

The Wolfcamp formation extends across the Delaware Basin, Central Basin Platform, and Midland Basin – the three sub-basins that comprise the Permian Basin. The stacked formation has four intervals, called benches, which are designated from top to bottom as A, B, C and D. Most of the current drilling activities take place in the Delaware and Midland Basins and target the Upper Wolfcamp (benches A and B), which is more oil-rich, rather than the Lower Wolfcamp (benches C and D), which is more natural gas-rich.

Of the stacked shale formations that comprise the Permian Basin, the Wolfcamp is the deepest and thickest but varies significantly across the formation. Wolfcamp subsea depth varies in the Delaware Basin from 0 ft in the west to 9500 ft in the central areas. In the Midland Basin, the subsea depth ranges from 2000 ft in the east along the Eastern Shelf to 7000 ft along the basin axis, near the western basin edge. Wolfcamp thickness ranges from about 800 ft to more than 7000 ft thick in the Delaware Basin, and thickness ranges from 400 ft to more than 1600 ft thick in the Midland Basin, varying from 200 ft to 400 ft in the adjacent Central Basin Platform.

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