Oil well cementing operations are imperative in drilling and completion operations of oil and gas wells to ensure adequate zonal isolation between the wellbore and well environment in order to preserve contamination of surface water zones and also prohibit fluid exchange among geological formations. The cementing operations provide effective support to the casing in place, providing well stability amongst paramount reasons. A jeopardized or, rather, compromised cementing operation renders the integrity to surmountable issues in the long-term productivity of the well and also the neighboring surroundings to environmental concerns. Diverse classes of ordinary Portland cement singularly used in oil well cementing operations have shown to perform below par in adverse conditions and presented situations that demand the design of cement slurries with optimum efficiency in those conditions. The purpose of this study is to optimize the concentration of fly ash and cement using Class F fly ash and Class G Portland cement, two commonly-used combinations, to study micro-mechanical structure and robustness of the varied resultant pozzolanic combinations. The changing morphology, due to varied concentrations of both materials, curing temperature, and humidity, provided the avenue to optimize compressive strength, Gibbs energy, and moisture content, thereby verifying the optimum combination and its applicability in the cementing operations of the oil and gas industry.
Robustness and micro-mechanical structures of pozzolanic cement activated under standard specified conditions for the used materials were studied at temperatures of 1870 F and humidity of 32 Hg. The introduction of fly ash to the Portland cement initially aided desired results, but subsequently depreciated in mechanical effects of the pozzolanic cement.
The most desirable micro-mechanical results were recorded at mixtures of 20% fly ash and 80% Portland cement after different curing times, and these observations are in tandem with researched experiments in the cementing and drilling fields.
|Commitee:||Boukadi, Fathi, Feng, Yin|
|School:||University of Louisiana at Lafayette|
|School Location:||United States -- Louisiana|
|Source:||MAI 56/01M(E), Masters Abstracts International|
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