A sandface pressure response to unit-rate production in the same or remote well.
It further splits into:
| DTR | Pressure pressure response to to unit-rate production in the same well |
| CTR | Pressure pressure response to to unit-rate production in the remote well |
The source of UTRs are:
| Numerical pressure or flow simulations | Deconvolution of long-term PDG data records | Pressure interference Testing |
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