Patent ID: 11939518
Assignee: HALLIBURTON ENERGY SERVICES, INC.
Field: Basic materials chemistry (Chemistry)
Classification: CPC C | IPC C

Claim 0:
1. A method for displacing wellbore fluids, comprising:
providing a spacer fluid comprising water and a spacer additive, wherein the spacer fluid has a yield point of about 2 lbf/100 ft2 to about 50 lbf/100 ft2, wherein the spacer additive comprises a biopolymer polysaccharide gum, a modified cellulose, and a solid scouring material,
wherein the spacer additive is essentially free of crystalline silica;
wherein the spacer additive is essentially free of clay;
wherein the biopolymer polysaccharide gum is present in the spacer additive in an amount of about 2% to about 6% by weight of the spacer additive;
wherein the modified cellulose is present in the spacer additive in an amount of about 0.25% to about 3% by weight of the spacer additive; and
wherein the solid scouring material is present in the spacer additive in an amount of about 91% to about 97.9% by weight of the spacer additive; and

introducing the spacer fluid into a wellbore to displace at least a portion of a first fluid in the wellbore.