Wellbore abandonment using recycled tire rubber

A method comprising:

• flowing a plug of cement into a wellbore to be abandoned;
• after the plug of cement has set, alternately flowing a quantity of a wellbore abandonment fluid and a quantity of a plug of cement, waiting for the plug of cement to set before flowing the quantity of the wellbore abandonment fluid, until a surface of the wellbore is reached, wherein each quantity of the wellbore abandonment fluid includes a mixture of rubber powder obtained by shredding rubber tires and well fluid;
• and
• plugging the surface of the wellbore with another plug of cement.

A method comprising:

• shredding waste tire rubber into shredded rubber;
• mixing at least a portion of the shredded rubber with a quantity of a wellbore fluid to form a wellbore abandonment fluid comprising at least the portion of the shredded rubber;
• and
• pumping the wellbore abandonment fluid into a wellbore during operations to abandon the wellbore.