Abstract: The present invention disclosed a cross-linked plugging agent stimulated by high density brine which comprises: main agent: 21 wt %-53 wt %, gelling agent: 0.5 wt %-9 wt % and pure water; wherein the saline solution is selected from the group consisting of a Dipotassium phosphate (K2HPO4), a Tripotassium phosphate (K3PO4) and a Potassium pyrophosphate (K4P2O7); the gelling agent is selected from the group consisting of a Xanthan gum and a kappa carrageenan. The gelling time is controlled within 0.5-12 h under an experiment temperature of 90° C.-160° C. The final gelling strength is controlled within D-H. The density is controlled within 1.2-1.55 g/cm3.

Abstract: The present invention disclosed a cross-linked plugging agent stimulated by high density brine which comprises: main agent: 21 wt %-53 wt %, gelling agent: 0.5 wt %-9 wt % and pure water; wherein the saline solution is selected from the group consisting of a Dipotassium phosphate (K2HPO4), a Tripotassium phosphate (K3PO4) and a Potassium pyrophosphate (K4P2O7); the gelling agent is selected from the group consisting of a Xanthan gum and a kappa carrageenan. The gelling time is controlled within 0.5-12 h under an experiment temperature of 90° C.-160° C. The final gelling strength is controlled within D-H. The density is controlled within 1.2-1.55 g/cm3.

Abstract: The present invention disclosed a cross-linked plugging agent stimulated by high density brine which comprises main agent: 10 wt %-90 wt %, gelling agent: 0.5 wt %-9 wt % and pure water; wherein the main agent is selected from the group consisting of a Dipotassium phosphate (K2HPO4), a Tripotassium phosphate (K3PO4) and a Potassium pyrophosphate (K4P2O7), a Potassium Dihydrogen Phosphate (KH2PO4), a Sodium dihydrogen phosphate (NaH2PO4); the gelling agent is selected from the group consisting of a Xanthan gum and a kappa carrageenan. The gelling time is controlled within 0.5-12 h under an experiment temperature of 90° C.-160° C. The final gelling strength is controlled within D-H. The density is controlled within 1.0-1.55 g/cm3. The plugging agent is able to be applied in well completion and workover under high temperature, high pressure, multi-pressure series of strata oil and gas environment when temporary blockage and leak proof is required, protection of reservoir near perforations and water plugging.