Reservoir Geomechanics
1. Why do we need to forecast
both the ‘stress-regimes’ and ‘pore-pressure distribution’
prior to drilling?
2. Feasible to capture
the evolution of
‘restructuring of pore-geometry’
as the pore-pressure regime
evolves with hydrocarbon production?
3. When does the difference between
solid and fluid expansion to rock stresses and
fluid diffusion
become critical?
4. Under what circumstances,
do we have a significant deviation -
from the assumption that
“mechanical compaction is solely driven
by the vertical effective stress
exerted by the over-burden”?
5. Under what circumstances,
‘pore-pressure’ cannot be considered
to be
the ‘average oil-water phase pressure’?
6. Under what circumstances,
‘the reservoir rock saturated with oil and water’
tends to have
‘a “significant” elastic deformation’; and in turn,
ruling out the assumption that
“the reservoir rock remains to be in dynamic equilibrium state”?
7. As against the ‘reduction in reservoir permeability’
resulting from ‘rock compaction’ -
upon ‘increase in net stress’
(resulting from the changes in the initial stress state – associated with the reduction of pore pressure during reservoir production),
how frequently do we encounter the cases,
where the ‘increase in net stress’ lead to
‘the enhancement in permeability’
associated with the ‘stress paths’?
8. Which ONE of the following data
remains relatively easier
to secure from a real field scenario?
(a) permeability hysteresis behavior;
(b) stress-dependent permeability; and
(c) strain-dependent permeability (from strain-dependent porosity as a function of deformation & pore-pressure).
9. How do we decide whether
a particular reservoir
needs to be characterized either by using
(a) poro-elasticity theory; or, by using
(b) poro-elasto-plasticity theory?
Do we have enough data with us?
If not, what is the very purpose of solving
the governing equations of ‘reservoir’ and ‘rock deformations’ “simultaneously”
“at every time step” (fully coupled) –
that remains unconditionally stable?
Stress regime and pore pressure closely linked to each other.. it will affect well bore condition’s during drilling and hence drilling cost. Also, at reservoir level, have direct impact Hydrocarbon In-Place , Resources and production forecasts. This will directly affect the project viability, Economics, profitability and ROI.
Re 1: the short answer - so that we can drill the well safely and without encountering well instability problems by properly designing mud weight relative to the stress regime and the pore pressures.
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