Isolation plugs, ratchet systems, and methods to set a packing element

A ratchet system for setting a packing element downhole, comprising:

• a ratchet wedge having a set of threads formed along an interior surface of the ratchet wedge, the set of threads configured to permit movement in a first direction towards the ratchet wedge and to restrict movement in a second direction away from the ratchet wedge;
• and
• a ratchet shoe configured to shift in the first direction to ratchet into the ratchet wedge to engage the ratchet wedge, wherein the ratchet shoe comprises a corresponding set of threads that are configured to engage the set of threads of the ratchet wedge to permit the ratchet shoe to shift in the first direction, and restrict movement in the second direction once the set of threads are engaged with the corresponding set of threads,
• wherein pressure applied by the ratchet wedge and the ratchet shoe onto a packing element positioned in between the ratchet shoe and the ratchet wedge expands the packing element radially to set the packing element.

A method to set a packing element, comprising:

• shifting a ratchet shoe in a first direction towards a ratchet wedge, the ratchet wedge having a set of threads formed along an interior surface of the ratchet wedge, the set of threads configured to permit movement in the first direction towards the ratchet wedge and to restrict movement in a second direction away from the ratchet wedge;
• setting a packing element positioned in between the ratchet shoe and the ratchet wedge as the ratchet shoe is shifted in the first direction;
• and
• engaging the set of threads of the ratchet wedge with a corresponding set of threads of the ratchet shoe to restrict movement in the second direction once the set of threads are engaged with the corresponding set of threads.