Prepare the pathway
The initial channel was cleaned with acid and neutralized before biomineralization treatment.
Case study 057 · Erie County, New York
Appalachian storage
well abandonment.
Two separate annular flow paths were treated with BioSqueeze. Both were sealed, sustained casing pressure was eliminated and the well was approved for plugging and abandonment.
ChallengeSustained casing pressure
DeploymentDownhole BioSqueeze®
ResultTwo annuli sealed
OutcomeApproved for P&A
The challenge
Gas flow across more than one annulus.
An operator contracted BioSqueeze to eliminate annular gas on the 4½-inch by 6⅝-inch annulus of a storage well being prepared for abandonment. Cement-bond logging showed sporadic intervals with little or no cement coverage.
After a cut was made in the 4½-inch casing at 490 feet, bubbling shifted from the annulus to the wellbore, confirming connection to the gas channel. During the initial BioSqueeze treatment, bubbling was also observed on the outer 6⅝-inch by 10¾-inch annulus, revealing a second connected integrity problem.
The treatment
Diagnose, access and progressively seal.
Treat the first annulus
BioSqueeze was injected through the casing cut at 490 feet to seal flow on the 4½-inch by 6⅝-inch annulus.
Access the outer annulus
Deep-penetrating perforations were placed at 370–373 feet through both casing strings.
Seal the second pathway
A second staged BioSqueeze treatment addressed the 6⅝-inch by 10¾-inch annulus.
The result
Two for two.
Both annuli sealed. SCP eliminated. Well approved for P&A.
0bubbles in 30 minutes on the inner annulus
0bubbles in 30 minutes on the outer annulus
140+ ftof cement healed on the inner annulus, confirmed by CBL
100%success across both targeted annuli
The case demonstrates how low-viscosity, self-diverting treatment can address multiple connected pathways within a complex well architecture.
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