Title:

Thermal Expansion, Fluid Flow, and Thermal Shock of Cement and a Cement/Steel Interface at Elevated Pressure and Temperature

Authors:

Stephen BAUER, Perry BARROW, Tatiana PYATINA, Toshi SUGAMA

Key Words:

cement, high temperature and pressure, well integrity

Conference:

Stanford Geothermal Workshop

Year:

2020

Session:

General

Language:

English

Paper Number:

Bauer

File Size:

3447 KB

View File:

Abstract:

A critical parameter for the well integrity in geothermal storage and production wells subjected to frequent thermal cycling is the interface between metal casing and cement composite. A team from Sandia and Brookhaven National Labs is evaluating Thermal Shock-Resistant Cement (TSRC) to facilitate its use during severe and repeated thermal cycling in geothermal wells. For this portion of the laboratory study we report on preliminary results from subjecting TSRC to high temperature (T more than 200°C), at a confining pressure of 13.8 MPa, and pore water pressure of 10.4 MPa and to heat cycling tests (250°C heat – 18°C water). Our work includes developing the test system to measure dimensional changes during heating and cooling and fluid flow at elevated temperature and pressure. We studied three sample types; steel, solid cement and a steel cylinder sheathed with cement. In the latter sample type, we flowed water through the inside of the steel cylinder rapidly to develop an inner to outer thermal gradient on this test geometry. Comparison of TSRC and common ordinary Portland Cement (OPC)-based formulations in heat-water cycles showed cement- carbon steel (CS) bond to be the weak point for both systems with OPC-CS bond strength decrease of 84% and TSRC-CS bond decrease of 11% after 20 cycles. The better TSRC performance could not be explained by the difference in cement’s coefficients of thermal expansion but was shown to be, at least partially, the result of differences in their interfacial chemistries. Sandia National Laboratories is a multimission laboratory managed and operated by National Technology and Engineering Solutions of Sandia, LLC., a wholly owned subsidiary of Honeywell International, Inc., for the U.S. Department of Energy’s National Nuclear Security Administration under contract DE-NA-0003525. SAND2019-12547 A


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