The operator needed a solution that didn’t involve pulling the tubing.
Pressure and Temperature: Although the deployment did not fully meet High Pressure High Temperature conditions, setting depth parameters of 14,295ft and 8055psi meant using specialist high temperature alloys for the plug material to counter the amplified effects of the environment.
Narrow Restriction: Restrictions in the well necessitated the diameter of the BiSN tool string to be 97°C no larger than 3.25”. This prevented the use of cast-alloy tools due to the geometric limitations.
Due to this challenge the Wel-lok™ MXD (Maximum Drift Tool) tool was selected allowing unique BiSN alloy beads to be deployed past the restriction in sufficient volume to form an effective plug.
Using the MXD tool which utilizes bailers and heaters in the same string, allowed us to make a highly effective plug in one single run giving significant time and cost savings.
High H2S Environment: The well presented a highly corrosive environment with 6% H2S present. With the corrosion-resistant properties of BiSN alloys, and by using NACE compliant materials in the MXD tool itself, the job was completed without impact from the H2S, and the plug formed a long-term barrier without threat of corrosion.