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Effect of Hydrofluoric Acid on Well Cement during Acidizing

Dionysius Asai, Crescentia Estrall (2010) Effect of Hydrofluoric Acid on Well Cement during Acidizing. Universiti Teknologi Petronas. (Unpublished)

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Abstract

This paper covers the study of the effect of hydrofluoric acid (HF) on well cement class G when wells are subjected to acidizing operation. It has been shown that well cement, when exposed to acid attack, will show loss of integrity in providing zonal isolation to the well. Its compressive strength is also affected. Cement samples are cured at a range of pressure and temperature before subjected to acid attack. The effect of acid on the cement samples is quantified in terms of mass loss in cement, decrease in compressive strength and also compositional changes in the cement sample. There are claims that acid attack is purely superficial, where it only attacks the surface of the cement. Further attack is said to be hindered by the formation of a white precipitate identified as fluorite. From the result of the experiment, white precipitate is indeed observed on the surface of the cement cubes exposed to acid attack. To determine whether the attack is confined only to the surface, the sample was sliced open to include the middle portion for x-ray fluorescence (XRF) and scanning electron microscope (SEM) testing. Results show that the middle portion of the cement sample experience little damage to acid attack. For cement cubes cured at higher pressure and temperature, the effect of acid on the well cement is less damaging. We can deduce that pressure and temperature do play a role in determining cement resistance to acid, and that HF attack on cement is superficial.

Item Type: Final Year Project
Academic Subject : Academic Department - Chemical Engineering - Ionic Liquid
Subject: T Technology > TP Chemical technology
Divisions: Engineering > Chemical
Depositing User: Users 2053 not found.
Date Deposited: 22 Oct 2013 11:56
Last Modified: 25 Jan 2017 09:42
URI: http://utpedia.utp.edu.my/id/eprint/9364

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