Reservoir Compressibility: Useful only in land subsidence?
Feasible to deduce the compressibility of a petroleum reservoir (sandstone) as a function of fluid-pressure drop in a reservoir?
How difficult would it remain to deduce the ‘relative changes in reservoir thickness’ in order to estimate the above sandstone’s rock-matrix compressibility? Feasible to deduce the role of individual contributions: (a) deformation of the solid-grain matrix of the reservoir; (b) expansion of brine, oil and gas – upon hydrocarbon production from a confined reservoir?
How useful would it remain, if we deduce the value of ‘Storativity’ (S: a dimensionless property) of a petroleum reservoir as a function of (a) drop in piezometric-head; (b) surface area of the reservoir being produced from; and (c) volume of fluids withdrawn from stored reservoir (S = ab/c)?
Could the estimation of ‘specific storage (SS)’ of a reservoir also remain useful in reservoir engineering, (estimated as a function of Storativity over reservoir thickness’ (SS = S/thickness)?
OR
Whether the correlation between ‘specific-storage’ as a function of rock-compressibility (RC), fluid compressibility (FC), reservoir porosity (P) and specific-weight of the fluid (SWF) has any vital information associated with the draining principle of reservoir engineering {SS = (SWF*RC)+(P*FC)}?
OR
The concept of ‘Storativity’ would remain useful - only in the estimation of ‘reservoir compaction’ and its associated ‘land subsidence’?
How do we ensure whether a reservoir undergoes a ‘normal compaction’ upon hydrocarbon production? How do we know that the deformation of the solid-grains of a sandstone reservoir remains concurrent with the fluid expulsion?
Or
How do we know that the ‘rate of loading’ remains larger than the ‘rate of fluid expulsion’ so that we could conclude that there is a ‘disequilibrium compaction’ of the concerned reservoir? And, in such cases, how do we estimate the ‘enhanced fluid-pressure’ resulting from the fact that ‘the fluid temporarily carries part of the load, which remains ultimately transferred to the solid-grain matrix of the reservoir’?
Compressibility can also be used to assess the effect of changes in the stress state of reservoirs on their porosity, permeability, and other physical properties of rocks, not only to assess subsidence.
Zhukov V.S., Kuzmin Yu.О. Comparison of the approaches to assessing the compressibility of the pore space. Journal of Mining Institute. 2022. Vol. 258, p. 1008-1017. DOI: 10.31897/PMI.2022.97
Zhukov V.S., Kuzmin D.K. Estimates of Compressibility of the Pore Space of the Reservoirs of the Uvyazovskoe Underground Storage Facility // Seismic Instruments, 2022, Vol. 58, Suppl. 2, pp. S328–S336.
Suresh,
In poorly consolidated (= highly compressible) reservoirs compaction can be a relativrly significant drive mechanism ( cf the squeezing of a sponge to eject the fluid from the spone’s pore space)
A well known example of an offshore field in which compaction was significant is the Ekofisk field in the Norwegian sector of the North Sea. Sea floor subsidence on the order of 10 metres necessitated raising the plarforms at a yotal cost on the order of $ 1 billio
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