Analisis Pengaruh Penambahan Additif Fly Ash Batu Bara Terhadap Filtration Loss dan Free Water Pada Semen Pemboran Kelas G

Zakaria, Muharram (2020) Analisis Pengaruh Penambahan Additif Fly Ash Batu Bara Terhadap Filtration Loss dan Free Water Pada Semen Pemboran Kelas G. Other thesis, Universitas Islam Riau.

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Abstract

The cementing process is one of the processes that determines the success of the drilling process. Failure of the cementing process will cause both material and non material losses. One of the causes of cementing failure is the occurrence of filtration loss or the entry of the cement filtrate into the formation, and free water or separate water in the cement suspension. To overcome this various additives have been developed, one example is additives containing carbon. Coal fly ash is one additive containing carbon, therefore research is needed to determine its effect on filtration loss and free water cement drilling. The first stage of the study was a literature study, then conducted a test to determine the effect of the addition of coal fly ash to filtration loss and free water using concentrations of 0%, 2,5%, 5%, 7,5%, 10%, 15%. The fly ash is filtered using mesh 200, and the filtration loss test is carried out using a filter press type LPLT (Low Pressure Low Temperature), while the free water test uses a measuring cup filled with a suspension of cement as much as 250 ml and allowed to stand for 2 hours until there is water which is free on the top of the measuring cup. In class G drilling cement, the addition of coal fly ash concentrations can reduce the filtrate volume. filtration loss testing with a concentration of 15% yields 180 ml filtrate, this value meets the API standard. Whereas in the free water test, each addition of coal flyash concentration reduces free water. And the results of free water that meets the API standard is at a coal fly ash concentration of 1.2% which is obtained 3 ml. In research using the Minitab software obtained significant linear regression results because each testing device obtained the results of analysis of variants smaller than 95% or 0.05. Obtained equation, filtration loss 235.2 - 465.7 mass, correlation value -0.889 and p-value 0.015. Free water equation 0.03717 - 0.2126 mass, correlation value -0.851 and p-value 0.032.

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