Well treatment compositions and methods comprising certain microemulsions and certain clay control additives exhibiting synergistic effect of enhancing clay swelling protection and persistency

A method of treating a subterranean formation of an oil and/or gas well using a well treatment composition for clay control treatment, comprising the steps of:

• delivering a microemulsion to the subterranean formation, wherein the microemulsion comprises an aqueous phase from 10 wt % to 50 wt %, versus the total weight of the microemulsion;
• a surfactant from 10 wt % to 40 wt %, versus the total weight of the microemulsion;
• and a solvent from 5 wt % to 25 wt %, versus the total weight of the microemulsion;
• delivering a clay control additive to the subterranean formation, wherein the clay control additive comprises water from 30 wt % to 90 wt %, versus the total weight of the clay control additive;
• and a clay control compound from 10 wt % to 70 wt %, versus the total weight of the clay control additive, wherein the clay control compound comprises a cationic polymer, and wherein the cationic polymer comprises a polyquaternary ammonium resin having a molecular weight of less than 5,000 amu;
• delivering a carrier fluid to the subterranean formation;
• combining the microemulsion, clay control additive, and carrier fluid during injection into the subterranean formation to form the well treatment composition, wherein the microemulsion is from 75 wt % to 90 wt % of the total weight of the well treatment composition excluding the carrier fluid, wherein the clay control additive is from 10 wt % to 25 wt % of the total weight of the well treatment composition excluding the carrier fluid;
• and
• reducing swelling of a swelling clay.