Downhole Reservoir & Formation Testing - Drill Stem Testing | SLB

Downhole reservoir testing

Reliable, repeatable drillstem test data for informed characterization decisions

Schlumberger working with hand on the downhole reservoir testing tool.
Illustration depicting downhole reservoir testing tools.

The information you need to understand the reservoir

Since performing the first drillstem test (DST) in 1926, we’ve performed downhole tests that help customers economically achieve their test objectives. When your goal is to unambiguously determine reservoir pressure, permeability, skin, and productivity, our downhole technologies reliably deliver the right answers.

Even in hostile well conditions, we’ll get you accurate downhole pressure measurements. Flexible tool designs deliver reservoir information from multiple zones on the same test, saving rig time and powering rapid updates for your reservoir models.

1927 advertisement for the Johnson Well Tester.

Formation Testing: The Early Days

Discover how, in 1926 near El Dorado, Arkansas, Edgar and Mordica Johnston performed the first commercial drillstem test (DST).

Read More

Downhole Reservoir Testing Offerings

  • Illustration of a downhole pressure gauge.
    Downhole Pressure Gauges
    High-quality pressure measurement in all reservoir testing environments

    Obtain precise pressure measurements in a wide range of environments with reliable downhole recorders. View

  • Quartet Product Sheet
    Downhole reservoir testing system

    Monitor and manage wellbore events as they happen, validate pressure data while you test, and ensure that you've met your test objectives before ending your test. View

  • Two Schlumberger workers reviewing data on a monitor (right) and illustration of the Quartet downhole reservoir testing system downhole (left).
    Downhole Test Tools
    Optimize the test string to meet your test objectives

    Assemble an optimal downhole test string with a wide variety of tools and equipment designed to fit your test objectives in any operating environment. View

  • Quartet-HT downhole reservoir testing system
    High-temperature downhole reservoir testing system

    Get reservoir-representative fluid samples and high-resolution pressure measurements with multicycle flexibility in a single run and at ultrahigh temperatures. View

  • Man pushing a button on the SenTREE 3 console.
    SenTREE 3
    Subsea test tree

    Perform well test and cleanup from any floating rig with a singular subsea safety solution. View