Madden Systems Tubing Check - Bad Gas Lift Page 1 of 2

http://www.maddensystems.com/tbg_chk2.htm 12/14/03

Tubing Checks II - Gas Lift System

Test Information:

This well has a gas lift system with 5 mandrels and valves. All data presented here was acquired in the tubing while the lift gas was being injected under normal, stabilized conditions.

Can you make the call?

Study the plot and then click here or pan down to see if you get the same answer we did.

Tubing Check Log Seg

Madden Systems Tubing Check - Bad Gas Lift Page 2 of 2

http://www.maddensystems.com/tbg_chk2.htm 12/14/03

Tubing Check Strategies Tubing Check Procedures

Tubing Check Intro Gas Lift Inspection I Hole In Tubing Test Your Interpretive Skills

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Madden Systems Incorporated

Analysis

Let's take a look. We see the Spinner indicating the pronounced negative spikes (left) at points A, B, C, D, and E. The 5 lift mandrels. However we see no clear baseline shift. Point E could reflect a small entry. However, we see no collaborating evidence from the other sensors.

Spinner, Temperature, Capacitance, and Delta PSI all indicate a substantial entry at point F.

We have a hole in the tubing, below all the valves, allowing all the lift gas to make an uncontrolled entry.

Tubing Check Log Seg