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Fines Removal from Clogged Porous Media

A. K. Sharifullah
Joint Director
Bangladesh Academy for Rural Development, Comilla.

Abstract/ Executive Summary:

Water has been used in the removal of fine particles from clogged porous media for a long period with varying degrees of success. But experimentation shows that water may not be the most efficient fluid for the removal of fines. Xanthan gum is one of the well known polymeric fluids used in drilling industry. The experiment shows that Xanthan gum is reasonably efficient in removing fines at its 0.30 percent of concentration under flushing pressure of 21 psi. The percentage of fines removed was proportional to the concentration of fines in the porous media. This trend was consistent in both coarse and fine formations. There were no significant differences between water and Xanthan gum application regarding fine particle removal from highly clogged porous media.

Keywords: Water, Xanthan gum, Porous media, Clossing

Location: Bangladesh Academy for Rural Development, Comilla

Start Date:

End Date:

Program Area: Risk Management in Agriculture

Commodity: Water quality

Objectives:

To show the suitable concentration and pressure under which it acts well in removing fine particles from water well formations.

Methodology:

Each of the formations was clogged with predetermined 1, 7 and 14 percent of fines. At first, the weight of the volume of the unclogged formation just enough to fill the cells was taken. The corresponding weight of fines to attain, 1, 7 and 14 percent concentration of clogging were next obtained. The required fines and formation samples were then mixed in a container and later placed into the cells via a funnel. Flushing out of fines commenced after initial stirring of the previously mixed fluid through the bypass pipe work of the system and the drilling fluid container. Two different levels of pressure were maintained in the annulus by adjustment of the valves within the system. Flushing period was normally terminated when the flow rate of the filtrate becomes constant. This generally occurred around 10 minutes of the flushing period. After the flushing period, a final measurement of permeability with water was repeated. The latter results gave an indication of the percentage of permeability recovered by each fluid when compared to the original unclogged permeability of the sample.

Source of Information: Agricultural Engineering Division, Vol. 23/ AE, No.1, 66-76, Dec. 1995

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Xanthan gum works reasonably in removing fine particles and corresponding permeability impairment in granular formations at a flushing pressure of 21 psi and 0.30 percent of its concentration. At a high clogging concentration of the formation there is no significant Improvement in permeability recovery through application of Xanthan gum compared to normal water. Water can be applied reasonably in high clogged formation for initial development from an economic point of view. It needs further examination to determine the maximum limit of chemical application for highly dogged porous media.

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