Cementing operation is very important in drilling and completion of oil and gas wells to ensure effective casing support and zonal isolation in order to prevent 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 develop environmental friendly fly ash based geopolymer material as substitute for ordinary Portland cement. This study involved conducting rheology, compressive strength, slurry stability and thickening time test for the optimized substitute material. The optimized fly ash geopolymer mix showed an increase in the compressive strength as the curing temperature increases, whereas increasing the temperature decreases the compressive strength in ordinary Portland cement. At 300°F, the compressive strength of fly ash based geopolymer increased to about 4100psi while that of Portland cement decreased to about 1400psi. The study also show that alkaline activated fly ash based geopolymer slurry does not exhibit fluid breakout and channeling and there is minimal settling tendency of the slurry solid components.
The thickening time test shows that temperature has a great effect on fly ash geopolymer slurry thickening time, while pressure has an insignificant effect. At higher temperature, the fly ash geopolymer slurry showed shorter thickening time. Addition of plasticizer can increase the thickening time of fly ash geopolymer when sodium silicate is not a component of the slurry mix. The result and observations from this research shows that with further study and improvement, fly ash based geopolymer can effectively be used as an alternative to ordinary Portland cement in oil and gas well.
|Commitee:||Boukadi, Fathi, Khattak, Mohammad J.|
|School:||University of Louisiana at Lafayette|
|School Location:||United States -- Louisiana|
|Source:||MAI 54/06M(E), Masters Abstracts International|
|Subjects:||Engineering, Petroleum engineering|
|Keywords:||Compressive strength, Fly ash, Fracture energy, Geopolymer, Modulus, Thickening time|
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