Montana Emergent Technologies (MET) was contracted by an operator in the DJ Basin of Colorado to remediate high bradenhead pressure on a well slated for abandonment. The operator had attempted to plug this well over a period of several months, with little to no success. Unsuccessful remediation efforts included numerous cement squeezes and an attempt to pull the casing. After all these attempts to fix, the bradenhead pressure remained high.
The radial cement bond log (Figure 1) showed several zones of poor cement above the surface casing shoe.
Figure 1. Radial Bond Log Images
MET performed several BioSqueezes® on this well at two different depths. While pumping fluids, the pressure and injection rate were monitored as shown in Figure 2. The first BioSqueeze® resulted in a reduction of the bradenhead pressure, but not completely. The operator indicated that there was evidence of gas coming into the annulus near the surface casing shoe, so they received permission to squeeze closer to the shoe. During this squeeze, pumping at constant pressure caused the injection rate to drop, indicating sealing of fractures and micro-annuli in the cement. The Post-BioSqueeze® #2 log in Figure 1 shows the significant amount of solids buildup behind casing. This second BioSqueeze® reduced the bradenhead pressure to zero psi and the well was subsequently cut and capped.
Figure 2. Graph of Injection Rate and Pressure
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