关键词: 聚电解质, 粘度, 膨胀, 絮凝

Abstract: Two cation polyelectrolytes were respectively mixed with two anion polyelectrolytes, and the resultant complexes were examined on their ability to stabilize the wall of well and inhibit swelling of clay. Analyses were made on the compatibility, salt resistance and optimum proportions of the polyelectrolytes in the complexes, with the influence of pH taken into consideration.Results of the tests show that the complexes are highly salt-
and acid-resistant and are good in properties of inhibiting clay expansion and upholding the properties of drilling fluid. The mechanism of clay-swell inhibition by the complexes is discussed.

Key words: polyelectrolyte, viscosity, clay expansion, flocculation, mechanism