Multifunctional Cement for Geothermal Wells

Technical Report · Mon May 21 04:00:00 EDT 2018

DOI:https://doi.org/10.2172/1439327· OSTI ID:1439327

Pyatina, Tatiana ^[1]; Sugama, Toshifumi ^[1]

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1. Brookhaven National Laboratory (BNL), Upton, NY (United States)

This report compiles the work of BNL in support of Thermal Shock Resistant Cement evaluations (TSRC) by Schlumberger. BNL has worked on the formulation of thermal-shock resistant cement since 2011. All the materials on the blend including publications and presentations are in public domain and were sent to Schlumberger for review prior the beginning of the evaluations. Initial efforts focused on achieving long and controlled thickening time of TSRC at 85°C in thickening time tests in a pressurized consistometer. Since the results of BNL set control were not reproduced by Schlumberger technical feedback on Schlumberger testing was among the main efforts of the BNL team in the beginning of the collaboration. When it became clear that the main reason of results deviation was the difference in the mode of retarder addition (dry-blended at BNL and pre-dissolved at Schlumberger) the efforts shifted to the possible decrease in the cost of the formulation by changing concentrations and nature of the alkali activator as well as evaluating performance of more economical formulations with calcium-aluminate cement, Secar #51, Secar #71 and Ciment Fondu, suggested by Schlumberger based on communications with Kerneos (supplier of calcium aluminate cements). Another piece of information obtained by Schlumberger from Kerneos that prompted evaluations of different calcium-aluminate cements in the composition of TSRC was the fact that originally used Secar#80 contains some performance-improving additives that may interfere with the set control and rheological properties of the slurries. In summary, the report contains the following information: 1. Review of the setting behavior of TSRC slurries prepared by dry-blending TA powder or pre dissolving it in mix water in calorimetric tests at 85°C; 2. Results of evaluation of different alkali activators for improved compressive strength development and cost reduction; 3. Results of evaluation of Secar #51, 71 and cement Fondu as an alternative to Secar #80 in TSRC formulation – thermal shock tests and phases’ analyses of set cement; 4. A brief discussion of early-compressive-strength-development test conditions appropriate for geothermal wells.

• Research Organization: Brookhaven National Laboratory (BNL), Upton, NY (United States); Schlumberger Inc., Houston, TX (United States)
• Sponsoring Organization: USDOE Office of Science (SC); USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Geothermal Technologies Office
• DOE Contract Number: SC0012704; AC02-98CH10886
• OSTI ID: 1439327
• Report Number(s): BNL--205697-2018-CRAD; C-14-06
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
Lightweight Cement Composites