Patent ID: 11898085
Assignee: HALLIBURTON ENERGY SERVICES, INC.
Field: Basic materials chemistry (Chemistry)
Classification: CPC C | IPC C

Claim 8:
9. A method for introducing a spacer into a subterranean formation, the method comprising:
providing a spacer comprising:
a clay, wherein the clay comprises a smectite clay;
a hydroxylated polymer, wherein the a hydroxylated polymer comprises microfibrillated cellulose (MFC);
a cation;

the clay, the hydroxylated polymer, and the cation together in an amount sufficient to render the downhole fluid thermally stable at a temperature of 400° F.; and
at least one additional downhole fluid component-; and

pumping the spacer into the interior of a casing or a wellbore annulus in a wellbore in the subterranean formation to displace fluid remaining in the wellbore.