EFFECT OF ADDED SALT ON PROPERTIES OF AQUEOUS SMP SOLUTION

Sulfomethylated phenolic resin (SMP) is a drilling mud additive having good fluid loss and dispersion characters and may be resistant to the action of high temperature and high salt frequently encountered in we ll drilling, especially in deep wells. SMP is one kind of polyelectrol yte. There are dissociable groups (-CH2SO3-Na+) along the chain of SMP . The conformations and properties of SMP in solution are affected gre atly due to electrostatic attraction and repulsion. From the experimen tal results of viscosities and fluorescence spectra of polyelectrolyte SMP in pure water and aqueous solutions containing added salt, the ef fects of added salt on molecular conformations of SMP in aqueous solut ion and properties of reducing fluid loss of water base drilling mud a re discussed. (C) 1995 John Wiley and Sons, Inc.