Development and Change of Compressive Strength for Class G Oil Well Cement under High Temperature

Abstract:

The compressive strength of oil well cement would be damaged by high temperature in deep oil wells, which was caused by the obvious change of the components and microstructure of cement hydration products. The adaptability of common oil well cement for cementing under higher temperatures was confined by above reasons. Characteristics of development and change of compressive strength of Class G oil well cement were studied under different temperatures by using Static Gel Strength Analyzer and High Temperature-High Pressure curing chamber. The influence law of temperature and silica sands on compressive strength was analyzed. The results showed that the critical temperatures at which the compressive strength begun to decline were about 110°C and 150°C respectively; The compressive strength increased with curing time during the initial period and would reduced after it reached a certain value when temperature exceeded 110°C; For cement with silica sands, the compressive strength development trend was in the shape of two-stage form with increase of curing time within the range of 110~150°C, but for 160~200°C temperature range the development form was in the shape of single stage; The reasonable amounts of silica sands which would be added to cement slurry to enhance the compressive strength of hardening paste were determined to be 30%~40%.

• Periodical: Advanced Materials Research (Volumes 941-944)
• Pages: 1441-1444
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.941-944.1441
• Online since: June 2014
• Authors: Jing Fu Zhang, Kai Liu, Rui Xue Hou, Bo Wang, Jin Long Yang
• Keywords: Cement Paste Matrix, Class G Oil well Cement, Comperssive Strength, High-Temperature, Silica Sand

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