Methods of treating subterranean wells using changeable additives

A method of treating a subterranean formation intersected by a wellbore, comprising:

• (a) providing a well treatment composition comprising a well treatment fluid and an additive, the additive in the composition having an external surface shape;
• (b) injecting the well treatment composition into a wellbore;
• (c) contacting the subterranean formation with the well treatment composition;
• and
• (d) modifying at least one property of the external surface shape of the additive after injecting the composition into the wellbore by controlling a parameter,
• wherein after first modifying the at least one property, further modifying a property of the external surface shape of the additive, and further wherein the property after the further modification is substantially the same as prior to the first modification.

A method comprising:

• (a) providing a well treatment fluid comprising a liquid component and a solid component;
• (b) combining the well treatment fluid with an additive to form a well treatment composition, the additive in the composition having an external surface shape;
• (c) injecting the well treatment composition into a wellbore, the wellbore intersecting a subterranean formation;
• (d) forming a pack comprising the solid component and the additive at a desired location in the wellbore or formation;
• and
• (e) modifying at least one property of the external surface shape of the additive after injecting the composition into the wellbore by controlling a parameter,
• wherein the additive is a composite additive selected from at least one of at least two phases of the same component, combinations of at least two phases of at least two components, and combinations thereof.