Investigating the Effect of Nanozeolite on the Rheological and Mechanical Properties of Heavy-Weight Cement Slurry for Drilling Wells in Iranian Southern Oil Field

Document Type : Research Paper

Authors

1 MS 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 pumped into the well to isolate productive zones, protect the casing pipe, perform remedial operations, control 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 a specific gravity higher than cement, which can weigh up the slurry to overcome the hydrostatic pressure of mud and perform an excellent cementing job. Improving the mechanical properties of these cement slurries has always been an essential issue in the discussion of oil well cementing. In this study, the effects of nanozeolite on heavy-weight oil-well cement slurry are investigated in the laboratory to improve the rheological and mechanical properties of the cement. In the designed experiments, nano-zeolite is added to the slurry with 1, 2, and 3% by weight of cement (BWOC). The results show that nanozeolite is an additive to reduce the thickening time, increase the plastic viscosity, and reduce the slurry’s yield point. Thus, it should be noted that the pumping time of the cement slurry can be adjusted using other additives based on the required cementing job timing schedule. The experiments also show that adding nano-zeolite to the cement slurry from 1 to 3% BWOC increases the free fluid of the cement slurry but does not show any effect on controlling the fluid loss. Finally, by adding 2% BWOC of nanozeolite, the compressive strength of the cement stone increases, and the initial setting time of the cement slurry decreases.

Highlights

  • Impact of nanozeolite on rheological and mechanical properties of heavy cement slurry;
  • The effect of nanozeolite on the compressive strength of heavy cement slurry;
  • The effect of nanozeolite on the thickening time of heavy cement slurry.

Keywords

Subjects

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  • Receive Date 16 March 2022
  • Revise Date 09 May 2022
  • Accept Date 11 May 2022