The waterflood performance depends on two major components: the sweep efficiency and displacement efficiency.

The sweep efficiency depends on proper understanding of the vertical and lateral distribution of reservoir properties.

One of the methods to check and calibrate this understanding is to perform pressure interference test (PIT) in few cross-well intervals.

Unfortunately, a proper implementation of traditional step-response PIT with objective for quantitative interpretation requires shutting-down the wells, preferably the whole area around receiving well resulting in punishing production deferment.

This was a bottle-neck for wide spread of quantitative PIT for many decades.

This paper describes the experience with a specific implementation of PIT – Pressure Pulse Code Test (PCT) – which allows data acquisition under scheduled production.

The trade-offs are usually acceptable: longer field operations, high resolution downhole gauges, more complex and longer data processing, advanced software tools and as result – a more expensive service, which anyway comes much cheaper than production deferment.

The paper shows how PCT can be qualified using the synthetic field tests and real field tests and shows a typical application of PCT findings in one of the Eastern Siberian carbonate reservoirs.

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