Case Studies
BioSqueeze® on “Difficult” Plug and Abandon Well
BioSqueeze Inc. was contracted by an operator in the DJ Basin of Colorado to remediate high bradenhead pressure (sustained annular pressure) on a well slated for abandonment.
View StudyEliminate Sustained Annular Pressure in P&A Wells
When it’s time to retire an oil and gas well for good, BioSqueeze® permanently eliminates methane leakage and sustained annular pressure in the well without having to return several times to meet regulations. For P&A jobs where a cement plug in the wellbore has already failed, BioSqueeze® can seal cracks in the cement plug to eliminate leaks without the need for any drill out.
BioSqueeze® can eliminate sustained annular pressure in plug and abandon wells using three different techniques, shown below.
Bottom Annular Gas Squeeze
Operator Preparation
Step 1:
Identify problem annulus through bond logging.
Step 2:
Place bridge plug and perforate or notch casing to target leakage pathways.
Step 3:
Set packer and run tubing to bottom perf/notch to squeeze into the annulus.
BioSqueeze® Execution
Step 4:
The first day, connect equipment and pump low-viscosity, environmentally friendly biomineralization solution in position downhole using tubing.
Step 5:
Pump fluids into problem annuli for about 6 hours, applying pressure to squeeze fluids deep into leakage pathways. Monitor injection rate and pressure until gas migration is eliminated.
Step 6:
Seal the well in overnight at pressure to continue to form the barrier.
Step 7:
The following day, return to continue pumping fluids, ensuring that all problem annuli are fully sealed.
Bullhead Squeeze
Operator Preparation
Step 1:
Identify problem annuli and ensure cement is to surface.
BioSqueeze® Execution
Step 2:
The first day, connect equipment and pump low-viscosity, environmentally friendly biomineralization solution into the cement at the top of the problem annulus.
Step 3:
Pump fluids into the annulus for about 6 hours, applying pressure to squeeze fluids deep into leakage pathways. Monitor injection rate and pressure until gas migration is eliminated.
Step 4:
Seal the well in overnight at pressure to continue to form the barrier.
Step 5:
The following day, return to continue pumping fluids, ensuring that micro annuli are fully sealed.
Deep Cement Top Squeeze
Operator Preparation
Step 1:
Set packer and run tubing to just above existing cement plug.
BioSqueeze® Execution
Step 2:
The first day, connect equipment and pump low-viscosity, environmentally friendly biomineralization solution into the leaking cement plug.
Step 3:
Pump fluids into the wellbore for about 6 hours, applying pressure to squeeze fluids deep into leakage pathways. Monitor injection rate and pressure until gas migration is eliminated.
Step 4:
Seal the well in overnight at pressure to continue to form the barrier.
Step 5:
The following day, return to continue pumping fluids, ensuring that all micro annuli are fully sealed.
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