ENHANCED OIL RECOVERY PROCESS USING WATER SOLUBLE POLYMERS HAVING IMPROVED SHEAR RESISTANCE

摘要

An enhanced oil recovery process using high molecular weight water soluble polymer consisting in: —dispersing said polymer in injection brine, —and then injecting the dispersed polymer in the subterranean formation, characterized in that the high molecular weight water soluble polymer contains at least a non-ionic monomer and at least an amphiphilic monomer containing at least a side chain having an HLB above 4.5, said high molecular weight water soluble polymer having a molecular weight of more than 10 000 000.