Everything is Broken (including our web site): Broken hands on broken ploughs, broken treaties, broken vows, broken pipes, broken tools, people bending broken rules…(Bob Dylan). In the spirit of global disorder, let’s look at failed #welltests… Sometimes mysterious, unusual, and bizarre things happen #welltesting. Occasionally we figure out what went wrong… Here’s an example of a gas well test that failed because the bottom hole assembly was not configured correctly – the sliding sleeve being set too high. With recorders in the hole, the sliding sleeve open, liquids filled up the tubing, destroying our test. Remember the hydrodynamic ‘U’ tube effect! Moreover, don’t forget the effect ‘capillary pressure’ has on liquid levels in the tubing vs. annulus (casing). Differential pressures between tubing and casing are a good diagnostic tool for identifying liquids, and you can calculate the difference in head (kPa/m, m). Surface tests can also be sorely affected by liquid movement downhole.