Document Type : Research Paper

Authors

• Amin Poorzangheneh ¹
• Bijan Ghanavati ²
• Borzu Asgari Pirbalouti ³

¹ M.S. Student, Department of Petroleum Engineering, Mahshahr Branch, Islamic Azad University, Mahshar, Iran

² Professor, Department of Petroleum Engineering, Mahshahr Branch, Islamic Azad University, Mahshar, Iran

³ Assistant Professor, Department of Petroleum Engineering, Masjed_ Soleiman Branch, Islamic Azad University, Masjed_ Soleiman,Iran

Abstract

Oil well cementing is a multi-purpose operation, in which cement slurries are prepared by mixing water, cement and various additives and is pumped into the well in order to isolate productive zones, protect the casing pipe, perform remedial operations, controlling drilling fluid lost or abandon the well. Various additives are used to improve the mechanical properties of the slurry, like cement retarders and accelerators which increase and decrease the thickening time of the cement slurry, respectively. Weight-enhancing additives are materials with specific gravity higher than cement, which can weight-up the slurry to overcome the hydrostatic pressure of mud and performing a good cementing job. Improving the mechanical properties of these type of cement slurries has always been an important issue in the discussion of oil wells cementing. In this study, the effects of nano zeolite on heavy-weight oil well cement slurry were investigated in laboratory to improve the rheological and mechanical properties of the cement. In the designed experiments, nano-zeolite was added to the slurry with the amount of 1, 2 and 3% BWOC (By Weight of Cement). The results showed that nano zeolite acts as an additive to reduce the thickening time, increase the plastic viscosity and reduces the yield point of the slurry. So, it should be noted to adjust the pumping time of the cement slurry by using other additives based on the required cementing job timing schedule. The experiments also showed that in general, the addition of nano-zeolite to the cement slurry from 1 to 3% BWOC led to an increase in the free fluid of the cement slurry, but did not show any effect on the control of the fluid loss. Finally, by adding 2% BWOC of nano zeolite, the compressive strength of the cement stone increased and the initial setting time of cement slurry decreased

Highlights

• Impact of nano zeolite on rheological and mechanical properties of heavy cement slurry
• The effect of nano zeolite on the compressive strength of heavy cement slurry
• The effect of nano zeolite on the thickening time of heavy cement slurry

Keywords

• Casing pipe
• High weight cement slurry
• Nano zeolite
• Oil well cementing

Main Subjects

• Petroleum Engineering