BioSqueeze Inc. 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 for over three years with little success. Unsuccessful remediation efforts included numerous cement squeezes, micro-fine cements, resin, and an attempt to pull the casing. After all these attempts and well over $1 million spent on remediation efforts, Bradenhead pressure remained high.
Figure 1. Radial Bond Log Images
BioSqueeze Inc. performed BioSqueezes on this well at two different depths. The first BioSqueeze produced a significant formation of crystalized calcium carbonate as shown in Figure 1 and resulted in a reduction to the Bradenhead pressure but did not fully eliminate gas migration in the well. The operator indicated that there was evidence of gas coming into the annulus near the surface casing shoe, and subsequently received permission to perform a second BioSqueeze closer to the shoe.
During this BioSqueeze, pumping at constant pressure caused the injection rate to drop as shown in Figure 2, indicating sealing of fractures and micro-annuli in the cement. The second BioSqueeze permanently sealed the well as shown in Figure 1, reducing Bradenhead pressure to zero psi, and allowing the well to be subsequently cut and capped. Earlier use of BioSqueeze would have saved hundreds of thousands of dollars.
Figure 2. Graph of Injection Rate and Pressure
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