Control Heat of Hydration by Characterizing Cementitious Components

A method of designing a cement composition for use in a wellbore, the method comprising:

• selecting a target time and temperature,
• wherein the target heat of hydration is for setting of the cement composition in the wellbore,
• wherein the target time is a setting time to reach the target heat of hydration, and wherein the temperature is a setting temperature for the cement composition;
• selecting one or more cementitious components and a weight percent of each of the one or more cementitious components for the cement composition;
• calculating a time dependent concentration of each of the one or more cementitious components in the cement composition at the selected temperature;
• determining an approximate time dependent heat of hydration for the cement composition for the target time and the temperature using the time dependent concentration of each of the one or more cementitious components,
• wherein the approximate time dependent heat of hydration is a sum of a component heat of hydration for each of the one or more cementitious components,
• wherein the component heat of hydration is obtained from a database comprising calorimetric data for each of the one or more cementitious components,
• wherein the one or more cementitious components and the weight percent is selected such that the approximate time dependent heat of hydration is less than or equal to the target heat of hydration;
• preparing the cement composition;
• and
• allowing the cement composition to set.

A system of generating a cement composition for use in a wellbore comprising:

• a plurality of cementitious components;
• and
• a computer system configured to accept input from a user and generate concentrations of the cementitious components for the cement composition,
• wherein the input comprises a target time dependent heat of hydration for setting of the cement composition and a target time to reach the target time dependent heat of hydration,
• wherein the computer system is further configured to generate concentrations of cementitious components based on the target time dependent heat of hydration,
• wherein computer system is further configured to determine an approximate time dependent heat of hydration of the cement composition at the target time,
• wherein computer system is further configured to determine a time dependent concentration of each of the one or more cementitious components in the cement composition at the selected temperature;
• wherein the approximate time dependent heat of hydration is a sum of a component heat of hydration for each of the one or more cementitious components,
• wherein the one or more cementitious components and the weight percent is selected such that the approximate time dependent heat of hydration is less than or equal to the target time dependent heat of hydration at the target time.