Pairing Wireline Formation Testing With Drillstem Testing Unlocks Potential

This paper compares deep transient testing with drillstem testing in a high- and low-permeability gas reservoir, including test-selection implications and best practices.

February 1, 2026

Journal of Petroleum Technology

Pictures of the different types of FT probes used in Field B.

In Southeast Asia, reservoirs are frequently laminated, thinly bedded, and compartmentalized. Testing every individual (main) zone with drillstem tests (DSTs) is not economical because of cost and rig-time constraints. Interval pressure transient tests (IPTT) and deep transient testing (DTT) have been introduced as greener alternative wireline-testing methods. This paper provides examples wherein DSTs with either IPTT or DTT have been acquired on the same well.

Digital Workflow for DTT

First, a power planner is run to determine the maximum system power available.

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