Settable Compositions and Methods of Use

A method for introducing a settable composition into a wellbore, the method comprising:

• providing a settable composition comprising pumice, hydrated lime, a set retarder, and water;
• introducing the settable composition into the wellbore such that the settable composition forms a puddle in the bottom of the wellbore;
• and
• allowing the settable composition to remain static in the wellbore, wherein the settable composition remains in a pumpable fluid state for a period of about 1 day or longer while static in the wellbore.

A settable composition system for setting a casing comprising:

• wellbore casing disposed within a wellbore;
• a settable composition for placing into the wellbore and capable of remaining in a fluid state of less than 70 Bc for a time period of about 1 days or longer while static in the wellbore, wherein the settable composition comprises:
• water,
• pumice,
• hydrated lime, and
• a set retarder;
• mixing equipment capable of mixing the settable composition;
• and
• pumping equipment capable of pumping the settable composition into the wellbore.