The purpose of this work is to study experimentally the feasibility of a Class F Fly Ash based Geopolymer Cement in Oil Well Cementing (OWC) for deep wells; comparing it with Class H Cement to see if it can provide solutions to the problems posed by Ordinary Portland Cement (OPC).The use of geopolymers in the past in the oil/gas industry has been unsuccessful due to not being able to attain a reasonable thickening time. Unconfined Compressive Strength (UCS), shear bond strength, shrinkage, thickening time, fluid loss, gel strength and free water tests have been conducted in this study to compare it with Ordinary Portland Cement at the same conditions. Temperature is a critical factor that affects the thickening time of the Geopolymer mix slurry. Thickening time of more than four hours was recorded for the optimized mix with the aid of a blend of superplasticizer and retarder. A high compressive strength was observed after fourteen days of curing of the Geopolymer mix. This shows that for the Geopolymer mix the strength increases whereas strength retrogression effects are observed in Portland cement. Higher Shear bond strengths have been observed for the Geopolymer mix and the free water test was successful and showed no channeling or free fluid in the geopolymer mix. The mix has a capacity to operate for circulating temperatures of up to 250° F. The shrinkage in the Geopolymer mix is significantly less than in Portland cement. Increasing the ratio of alkali to fly ash results in much longer thickening times for the geopolymer mix designs. With the results of the study it can be justified that the Fly Ash based Geopolymer mix design has the potential to replace Portland cement after being adequately tested in the field applications.
|Advisor:||Salehi, Saeed, Khattak, Mohammad Jamal|
|School:||University of Louisiana at Lafayette|
|School Location:||United States -- Louisiana|
|Source:||MAI 56/05M(E), Masters Abstracts International|
|Subjects:||Engineering, Petroleum engineering|
|Keywords:||Cementing, Fly ash, Geopolymer|
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