Effect of High Pressure and Temperature on Strength of Oil Well Cement

Development of high early-age compressive strength oil well cement is an important task in the oil well cement design. Achievement of suitable early-age compressive strength of oil well cement ensures both the structural support for the casing and hydraulic/mechanical isolation of borehole intervals. Holding this issue in mind, in this research, the effect of pressure and temperature changes inside the borehole on the class G oil well cement compressive strength has been studied. In the proposed work, in contrast to the mostly previous studies which considered some certain temperatures and atmospheric pressure in their tests, the effects of contemporary pressure and temperature changes on the early-age compressive strength of oil well cement have been investigated. Using a non-destructive method, the compressive strength of 48 hours cured cement samples under progressive changing of simultaneous pressures and temperatures coincident to a real oil well data were measured and recorded continuously at predefined intervals during this 48 hours period time. The case study was an oil well located in Darquain region of Khuzestan province in Iran.