From a reader, December 21, 2020:
It may bear close watching to ascertain whether
those extraordinarily low numbers for water to frac the Topaz wells are,
indeed, accurate.
While you may well be correct that it is incomplete data, it actually MIGHT prove to be the actual numbers.
If so, another step change/milestone will have been achieved in fracturing technology.
Long
story short (I am poor in explaining this stuff), the water used in
fracturing is the medium by which elevated pressure 'opens up' the
pre-existing microfissures. In addition, it transports the proppant
(sand) which maintains the fissures in an open state.
We all know this already.
However, the incentive for years has been to accomplish these twin goals with as minimal amount of water as necessary.
The
biggest reason - of many - is that the expanding 'tip' of the frac
might encroach offset wells (horizontally) and/or potentially go 'out
of zone' vertically which invites much higher volumes of unwanted
produced water which is already in the rock.
If
operators - and the Bakken boys are absolutely out front -
technology-wise in these matters - have been able to control/contain
the fracture geometry to the extent only 2 and a half milluon gallons of
water are needed, that would be an incredible achievement.
Through
the use of diverters (temporary blocking plugs), close real time
monitoring of frac propagation, and precise pressure and volume
management of the pumped water/frac fluid, these guys may have been able
to maintain an elevated 'pressure bubble' of, say, >500 psi, by
which the micro fissures will open but the fluid will NOT expand outside
the desired geometry (horizontal and vertical) due to
diverter/pressure/water volume being tightly and effectively used.
Essentially,
WPX may have been able to create an environment wherein a high degree
of fracturing and proppant placement has occurred while avoiding a 'too
big' an area where frac fluid/water has traveled.
If this has taken place, it will be a HUGE advancement in field development.
Key will be observing future amounts of water used in completions.