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Prestimulation testing in low-permeability reservoirs typically serves two purposes: to estimate formation properties for fracture-treatment optimization and to estimate formation permeability for use in analyzing post-fracture pressure-transient tests.

Unfortunately, prefracture testing is often omitted from the well planning, drilling, and completion process for a number of reasons. Perhaps the primary reason for not conducting prefracture pressure-transient tests is a perception that the cost is not justified. In many tight gas reservoirs, wells will not flow without at least a breakdown treatment, adding to the cost of testing.

In infill drilling programs where the reservoir is well understood and post-fracture treatments perform as expected, there might be some justification for not running prefracture tests. However, in new reservoirs and in existing reservoirs where post-fracture performance is consistently lower than projected, prefracture testing is recommended as a powerful tool for understanding completion and reservoir performance.

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