Mitigation of transient gels in cements

A method comprising:

• providing a cement slurry comprising:
• graphene;
• a cement;
• and water, wherein the graphene comprises bioderived renewable graphene (BRG), wherein the BRG comprises nanosheets comprising greater than 90 weight percent carbon, and wherein the nanosheets have a surface area of at least 2000 m2/g and up to 2496 m2/g, a pore volume of at least 3 cc/g and up to 5.0 cc/g, or a combination thereof, and wherein the cement slurry has reduced transient gel formation relative to a same cement slurry absent the graphene;
• placing the cement slurry in a workspace, wherein the workspace comprises a wellbore penetrating a subterranean formation;
• and
• allowing the cement slurry to set to provide a hardened cement.

A method of making a cement slurry, the method comprising:

• combining graphene with water to provide a mix water, wherein the graphene comprises bioderived renewable graphene (BRG), wherein the BRG is produced by:
• combining a renewable carbohydrate material with a dehydration solvent to aid hydrolysis;
• removing glycosidic linkages and water via chemical and/or thermal activation to provide an intermediate fused carbon material;
• thermochemically activating the intermediate fused carbon material to exfoliate intercalated carbon layers of the intermediate fused carbon material and to initiate chemical bonding of carbon atoms to form the BRG, wherein the BRG comprises a network of high surface area and pore volume sp2 bonded carbon nanosheets, wherein the nanosheets have a surface area of at least 2000 m2/g and up to 2496 m2/g, a pore volume of at least 3 cc/g and up to 5.0 cc/g, or a combination thereof:
• combining the mix water with a cement to provide the cement slurry,
• wherein the cement slurry has reduced transient gel formation relative to a same cement slurry absent the graphene;
• and
• pumping the cement slurry into a workspace, wherein the workspace comprises a wellbore penetrating a subterranean formation.