Mitigating sustained casing pressure by managing gas migration and annular flow.
Mitigating sustained casing pressure (SCP) starts with selecting the right cement barrier. Because SCP is often caused by a combination of flow mechanisms, it can be difficult to identify why it occurs. The IsoBond cement system proactively and economically mitigates SCP at its source, on all fronts, by delivering a barrier that minimizes fluid loss, shortens transition time, improves shear bonding, and reduces permeability.
SCP affects more than 30% of wells globally and is an indication that well integrity has been compromised, which can have an impact on wellbore isolation, emissions, and well production.
CC (or less) per 30 minutes fluid loss
Minutes (or less) transition time
Reduction in permeability
Shear bond improvement
The IsoBond cement system provides tight fluid loss control of 50 cc per 30 minutes or less for applications up to 250ºF. Tight fluid loss control helps to ensure successful placement of the cement slurry across challenging formations – and to also mitigate annular flow through unset cement by reducing the volume of losses created by the loss of filtrate from the cement slurry.
The IsoBond cement system provides a transition time of less than 30 minutes, which helps to mitigate the potential for gas or fluid flow through the cement slurry. After placement, the cement starts to build gel strength until it is no longer transmitting hydrostatic pressure to the annulus below, which often leads to a loss of overbalance pressure. This loss in overbalance pressure leaves the unset cement susceptible to gas and fluid flow through the unset cement. The IsoBond cement system builds gel strength rapidly, and this short transition time reduces the risk of gas or fluid influx, thereby reducing the risk of sustained casing pressure due to flow through unset cement.
The IsoBond system has been developed to reduce cement permeability by up to 75% compared to similar cement systems. Higher permeability cement is more susceptible to corrosive fluids and gases that can lead to degradation of the cement sheath. The reduction in permeability that IsoBond cement provides results in a cement sheath with increased resistance to degradation from corrosive fluids. IsoBond cement also has less susceptibility to gas influx and has proven to be a more dependable barrier to gas migration and annular flow for long-term integrity.
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