BioSqueeze Inc. was contracted by an operator in the DJ Basin of Colorado to remediate high bradenhead pressure (sustained casing pressure) on four of their horizontal producing wells. These wells had bradenhead pressure ranging from 80 psi to almost 900 psi. An advanced cement bond log was used to identify an appropriate location on each well to perform a BioSqueeze®. Preparation consisted of a rig crew setting a bridge plug, perforating the well, and running tubing. The workover rig was then moved to the next well. After the rig had moved on, we connected hoses from our trailer to the wellhead to begin our sealing process.
While pumping fluids, the pressure and injection rate were monitored as shown in Figure 1. Fluids were pumped at constant pressure and the injection rate fell steadily over time, indicating fractures and micro-annuli in the cement and associated zones were being sealed. After determining that the injection zone was plugged, we moved our equipment to the next well. This process was then repeated for all four wells.
With just one BioSqueeze® application to each well, bradenhead pressure was completely eliminated. Each well also passed mechanical integrity tests with no additional intervention, allowing them to be promptly returned to production.
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