Dissertation/Thesis Abstract

Experimental Investigation of Shear Bond Strength and Microstructure of Fly Ash Geopolymer Cement for Oil and Gas Industry
by Bwala, Akilahyel H., M.S., University of Louisiana at Lafayette, 2015, 111; 10003604
Abstract (Summary)

A cementing operation is very important in drilling and completion of oil and gas wells to ensure effective casing support and zonal isolation to prevent the exchange of fluids among different geological formations. A compromised cementing operation integrity can hinder the long-term production capability of the well and can also result in some environmental concerns. Ordinary Portland cement used in well cementing has shown to perform ineffectively in adverse conditions.

The purpose of this study is to optimize the shear bond strength of fly ash geopolymer by studying its microstructure. The changing morphology due to the molar concentration of the alkaline activator, plasticizer and curing temperature so as to optimize shear bond strength and verify its applicability in the Oil and Gas industry.

Shear bond strength and Microstructure of fly ash geopolymer activated with 8M, 10M and 12M of NaOH alkaline activator was studied at 200°F and 150°F. The introduction of plasticizer to the mixture initially aided in the formation of aluminosilicate gel but subsequently slowed the geopolymerisation reaction. Steel Pipe with removed mill coating finish enhanced the shear bond strength by improving surface roughness and resulting in mechanically interlocked bond. Experimental results of 8M, 10M, and 12M NaOH concentration showed that increasing molar concentration of NaOH requires more energy in creating a shear fracture. Comparing Class H cement with NaOH activated geopolymer only 8M NaOH showed a lower fracture energy as compared to Class H cement. Toughness energy was also investigated and Class H showed more rigidity to deformation as compared to NaOH activated geopolymer.

Two variables Na/Al and Si/Al were studied to determine its effect on the shear bond strength of fly ash geopolymer. Highest adhesion force between the pipe and fly ash geopolymer binder was observed with Na/ Al ratio of 0.83 and Si/Al ratio of 2.22.

Indexing (document details)
Advisor: Salehi, Saeed, Khattak, Mohammed J.
Commitee: Feng, Yin
School: University of Louisiana at Lafayette
Department: Petroleum Engineering
School Location: United States -- Louisiana
Source: MAI 55/03M(E), Masters Abstracts International
Subjects: Engineering, Petroleum engineering
Publication Number: 10003604
ISBN: 978-1-339-42720-1
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