I first addressed better source rock stimulation in November of 2012. EOG Resources
pioneered fraccing shorter and wider fractures.
Before this, operators
were trying to create longer fracs in an attempt to garner increased
shale surface area contact deeper into the shale. It was believed this
would maximize recoveries, but it also created issues. Longer fractures
are further from the well bore. This distance is difficult to bridge, as
it has to push proppant over a greater distance. Less proppant is
secured in the fractures and this increases crushing and closure of
those fractures. This significantly decreases EURs. Thinner fractures
also have less surface area, which creates greater pressures. These
greater pressures require more resilient ceramic proppant, which is
approximately 10 times more expensive than sand. Since EOG Resources
creates shorter, wider fracs, it reduces that pressure allowing for the
use of all sand fracs. The increased void created by this completion
design requires more proppant.
In some cases, these wells use up to a
million pounds of sand for every 1000 feet of lateral. EOG first used
this in the Eagle Ford and Permian Basin.
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