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12 - Production and Depletion

from Part II - Stimulating Production from Unconventional Reservoirs

Published online by Cambridge University Press:  14 June 2019

Mark D. Zoback
Affiliation:
Stanford University, California
Arjun H. Kohli
Affiliation:
Stanford University, California
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Summary

As introduced in Chapter 1, production rates from unconventional wells decline very rapidly during the first 2–3 years of production. In this chapter we first demonstrate that production rates (and cumulative production) are dominated by linear flow from the almost impermeable matrix into much more permeable fracture planes. The permeable fracture planes consist of the hydraulic fractures themselves and the pre-existing fractures and faults that have slipped in shear during stimulation. As we show, the rapid decrease in production rates is a natural consequence of depletion in these extremely low permeability formations. We argue that the cumulative area of permeable fracture planes created during stimulation is a key factor influencing ultimate resource recovery.

Type
Chapter
Information
Unconventional Reservoir Geomechanics
Shale Gas, Tight Oil, and Induced Seismicity
, pp. 345 - 374
Publisher: Cambridge University Press
Print publication year: 2019

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