Page 184 - Applied Petroleum Geomechanics

178 Applied Petroleum Geomechanics

In-situ stress, pressure (psi)
0 2000 4000 6000 8000 10000 12000
8000
Pp depletion
Sh depletion
SH depletion
8500 DFIT closure pressure
DFIT pore pressure
Depleted H1 pressure
Orig. OB well pressures
9000 Pp Sh SH Sv
Depth TVD (ft) 9500 Mid Bakken HydrostaƟc

Lodgepole

10000

Three Forks
10500

11000
Figure 5.11 Measured and estimated pore pressure and in situ stresses with 4285 psi
production depletion in the Middle Bakken reservoir from the DFIT and pressure
gauge measurements (symbols in the figure). DFITs were performed in the Bakken and
Three Forks formations (without depletion) in the observation and nearby wells. Gauge
pressure measurements are also plotted for the depleted pressure in the production
well and undepleted pressures in three observation (OB) vertical wells (Dohmen et al.,
2014).

(A) (B)
10000 Un-depleted 14000 Un-depleted
Minimum horizontal stress (psi) 6000 Minimum horizontal stress (psi) 10000
Depleted or refrac
12000
Refrac, depleted
8000
8000
6000
4000
4000
2000
0 2000 0
0 2000 4000 6000 8000 10000 0 2000 4000 6000 8000 10000 12000 14000
Reservoir pore pressure (psi) Reservoir pore pressure (psi)
Figure 5.12 Measured minimum horizontal stresses as a function of the reservoir
pressure and depletion. (A) The Middle Bakken and Three Forks reservoirs; (B) tight
sandstone of the Vicksburg formation.