A dry cementitious material mixture for 3D-printing, includes a hydraulic cement, at least one viscosity enhancing admixture, and clay and optionally aggregates, wherein the at least one viscosity enhancing admixture is present in an amount of 0.05-1.5% by weight based on the hydraulic cement and the clay is present in an amount of 0.01-5.0% by weight based on the hydraulic cement.

A dry cementitious material mixture for 3D-printing, includes a hydraulic cement, at least one viscosity enhancing admixture, and clay and optionally aggregates, wherein the at least one viscosity enhancing admixture is present in an amount of 0.05-1.5% by weight based on the hydraulic cement and the clay is present in an amount of 0.01-5.0% by weight based on the hydraulic cement.

Geopolymeric compositions are presented that are useful for cementing subterranean wells. The compositions may contain an aluminosilicate source, a metal silicate, an alkali activator and a slurry density modifier that may contain uintaite, vitrified shale, petroleum coke or coal or combinations thereof. Methods for placing the geopolymeric compositions in subterranean wells are also presented.

Geopolymeric compositions are presented that are useful for cementing subterranean wells. The compositions may contain an aluminosilicate source, a metal silicate, an alkali activator and a slurry density modifier that may contain uintaite, vitrified shale, petroleum coke or coal or combinations thereof. Methods for placing the geopolymeric compositions in subterranean wells are also presented.

Geopolymeric compositions are presented that are useful for cementing subterranean wells. The compositions may contain an aluminosilicate source, a metal silicate, an alkali activator and a slurry density modifier that may contain uintaite, vitrified shale, petroleum coke or coal or combinations thereof. Methods for placing the geopolymeric compositions in subterranean wells are also presented.

Geopolymeric compositions are presented that are useful for cementing subterranean wells. The compositions may contain an aluminosilicate source, a metal silicate, an alkali activator and a slurry density modifier that may contain uintaite, vitrified shale, petroleum coke or coal or combinations thereof. Methods for placing the geopolymeric compositions in subterranean wells are also presented.