METHOD OF TREATING SUBTERRANEAN ZONES with VISCOUS AQUEOUS FLUIDS CONTAINING XANTHAN AND A COMBINATION CROSSLINKER - BREAKER

摘要

Viscous aqueous fluids containing xanthan biopolymer gelling agent and a combination cross-linker and delayed breaker are provided. A viscous cross-linked aqueous treating fluid of the invention comprises water, a xanthan polymer gelling agent, and a combination cross-linker and delayed breaker for said xanthan biopolymer gelling agent.