Effects of Fresh Nano Zeolite on Physical Properties of Oil Well Cement Slurry at High Temperature

Eric Broni-Bediako, Fulgence Maal-Ire Naatu

Abstract


There are several types of additives that have been used to improve upon the physical properties of cement slurries at high temperatures. The search for unconventional materials for cementing of oil and gas wells at high temperatures has increased worldwide. It is expected that the unconventional materials make oil well cement withstand adverse temperatures, pressures, and other adverse wellbore problems without altering the intended purpose of the cement. This research seeks to evaluate the effects of fresh nano zeolite on physical properties of oil well cement slurry at Bottomhole Circulating Temperature (BHCT) of 66 oC. Experiments were conducted on a base cement slurry mixed with varying concentrations of fresh nano zeolite from 1% bwoc to 3% bwoc to determine the physical properties such as compressive strength, thickening time, free fluid, fluid loss and rheology. The physical properties were determined based on API standards for Testing Cements. Test results showed that compressive strength was improved by the addition of fresh nano zeolite at 2% and 3% bwoc except for 1% bwoc. An increase in zeolite concentrations at 150 oF (66 oC) resulted in an increase in the thickening time of all the cement slurries. This shows that fresh nano zeolite has a high retardation effect. Plastic viscosity increased from base cement slurry when 1% and 3% bwoc were added. However, the addition of 2% bwoc of fresh nano zeolite resulted in a decreased Plastic Viscosity (PV) as compared to the base cement slurry. Yield Point (YP) decreased as fresh nano zeolite concentrations were increased at 150 ℉ (66 oC). Increase in concentrations of fresh nano zeolites resulted in an increasing trend in PV/YP values for all the cement slurries. The addition of fresh nano zeolite to the base cement slurry did not cause any free water separation.


Keywords


: Compressive Strength, Fluid Loss, Free Fluid, Thickening Time, Zeolite,

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References


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