American Petroleum Institute

Technical Report on Temperatures for  Cement Operating Thickening Time Tests; 1993 Report from the  Task Group on Cementing Temperature Schedules - First Edition
 N TR 10TR3

Annotation

Temperature is the single most important variable affecting cement hydration [1]. Therefore, accurate information about temperatures in a well is critical to cementing operations. Many variables affect wellbore temperature, and measurement of temperature during an actual cementing operation is dif?cult. However, since the early 1940s temperature data has been gathered, analyzed and converted into estimates of wellbore temperatures with depth. These estimates of temperature versus depth have been incorporated into American Petroleum Institute (API) guides for testing cement formulations since the late 1940s. The API well-simulation test schedules have been valuable tools for the petroleum industry as guides for testing cement formulations in the laboratory and as estimations of wellbore temperatures for cementing operations.

Work performed by the 1984?91 API Task Group on Cementing Temperature Schedules to update the temperatures in API well-simulation test schedules is summarized in this report. The Task Group reviewed the largest set of temperature data available to the industry to date. Changes were proposed to temperatures in the well-simulation test schedules in API Speci?cation 10, 5th, Edition, based upon review of the data.

This report documents:

a. The proposed changes for temperatures.

b. The process used to develop the proposed changes.

c. The process used to develop temperatures in API Speci?- cation (Spec) 10, 5th Edition well-simulation test schedules.

d. The comparison of temperature data sets used to develop the proposed changes to temperatures in API Spec 10, 5th Edition, well-simulation test schedules.