| 摘要 |
<p>A method for shortening the shear recovery time of cationic, zwitterionic, andamphoteric viscoelastic surfactant fluid systems by adding an effective amountof a rheology enhancer selected from partially hydrolyzed polyvinyl ester andpartially hydrolyzed polyacrylates. The rheology enhancer also increasesfluid viscosity and very low rheology enhancer concentration is needed. Preferredsurfactants are betaines and quaternary amines. The fluids are useful in oilfieldtreatments, for example fracturing and gravel packing.</p> |
