Investigating the effect of oil well cement composition on the cement sheath integrity

Document Type : Research Paper

Authors

Faculty of Petroleum and Natural Gas Engineering

10.22124/jcr.2024.26195.1635

Abstract

Oil and gas wells are usually cased and cemented to provide a long-term integrity during the life of the well. Maintaining the integrity of the oil and gas wells, which is largely dependent on the characteristics of the cement, can prevent irreparable damage to the environment. To maintain well integrity, cement sheath must have low porosity, low permeability, sufficient bond strength at the contact surfaces, and suitable rock mechanical properties to withstand the induced stresses. In this research, cement compositions based on Portland cement, silica flour and magnesium oxide were developed and experimentally tested to evaluate their ability of well integrity provision. Tests were performed on raw materials, cement slurry and set cement samples. These tests included measurements of density, slurry free fluid, set cement porosity, permeability, bond strength, compressive strength, and Young's modulus. The results showed that with the addition of silica fluor, the porosity and permeability of set cement decreased to 9.76% and 0.037 mD, and with the addition of magnesium oxide, the bond strength and Young's modulus increased to 503.4 and 418.32 MPa. Also, the results showed that the addition of these materials leads to a reduction in the cement compressive strength.

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Concrete Research

Articles in Press, Accepted Manuscript
Available Online from 04 March 2024

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