The best practice of permanent plug and abandonment requires a cross sectional barrier, which is known as rock-to-rock barrier. The barrier is placed at the right depth where formation is capable to hold the maximum anticipated pressure. To fulfill the requirement, two general situations could be encountered: openhole plug placement or cased hole plug placement.
CITATION STYLE
Khalifeh, M., & Saasen, A. (2020). Fundamentals of Plug Placement (pp. 185–212). https://doi.org/10.1007/978-3-030-39970-2_7
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