Abstract: A method for well cementing may include supplying a settable composition including a cement composition and water into a well bore, and allowing the settable composition to set to form hardened concrete. The cement composition may include a hydraulic cement and natural glass, and the hardened concrete may have a strength activity index of at least 125%. A method for making well cement may include combining hydraulic cement and natural glass to form a cement composition, and adding water to form a settable composition. The method may further include allowing the settable composition to set to form hardened concrete, wherein the hardened concrete may have a strength activity index of at least 125%. A cement composition for use in well cementing may include hydraulic cement and natural glass having a median particle size (d50) of less than 12 microns and a top particle size (dm) of less than 30 microns.

Abstract: A proppant composition may include at least about 50 wt % total silica and up to about 50 wt % total alumina and a connected porosity greater than or equal to about 5%. A proppant precursor composition may include an alumina- or aluminosilicate-containing material and diatomaceous earth, wherein the diatomaceous earth may be greater than or equal to about 25 wt %. A method of making a proppant may include mixing an alumina- or aluminosilicate-containing material and diatomaceous earth to form a precursor composition, pelletizing the precursor composition, and sintering the pelletized precursor composition to form a sintered proppant having a connected porosity greater than or equal to about 5%. A method of treating a fracture site may include delivering a sintered proppant including an active agent to a well site, and dispersing the active agent from the sintered proppant within the well site.