ADIPEC 2014 Conference , 2014-11-10

Title : ( Improvement of Water Displacement Efficiency in Sandstone Reservoirs Using Buffered Sodium Silicate )

Authors: Hossein Ali Akhlaghi Amiri ,

Citation: BibTeX | EndNote

Sodium silicate is an inexpensive environmentally friendly chemical with initial water-like viscosity, favorable for well and reservoir water managements. The interest in the application of sodium silicate for water control is increasing among oilfield operators, especially in the Norwegian sector of the North Sea. However due to complexity of its gelation kinetics under reservoir conditions, still there are concerns about sodium silicate field applications. Controlling gelation time is the major concern for field application of sodium silicate, especially in the case of deep placements. The major concern for field application of sodium silicate is controlling gelation time. This paper addresses sodium silicate gelation kinetics as a function of different effective factors, using accurate experimental measurements. The main factors affecting the gel time in the alkaline silicate systems are silicate content, pH, salinity especially divalent ions and temperature. Increasing silicate content and reducing pH resulted in lower gelation time. Divalent ions in formation water, e.g., Ca2+ and Mg2+, reduced the gel time and caused metal silicate precipitation at high concentrations. Plotting the gelation time data versus pH and divalent ion concentrations for different silicate contents resulted in linear trends in semilogarithmic scales. Arrhenius plot of gelation time as a function of reciprocal absolute temperature showed that activation energy of sodium silicate gelation reaction below 40 °C is lower than that of higher temperatures (approximately 70 kJ/mol for T>40 °C). Based on the obtained results of the study and due to linearity of the trends in semilogarithmic plots of gelation time, a graphical method was developed to estimate the gel time under combined effects of the different factors. There was a very good agreement between the prediction results and experimentally measured values. The outcomes of this study provide useful knowledge for oilfield operators which are interested in reservoir water managements and profile control.

Keywords

, sodium silicate, gelation
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@inproceedings{paperid:1059276,
author = {Akhlaghi Amiri, Hossein Ali},
title = {Improvement of Water Displacement Efficiency in Sandstone Reservoirs Using Buffered Sodium Silicate},
booktitle = {ADIPEC 2014 Conference},
year = {2014},
location = {ابوظبی},
keywords = {sodium silicate; gelation time},
}

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%0 Conference Proceedings
%T Improvement of Water Displacement Efficiency in Sandstone Reservoirs Using Buffered Sodium Silicate
%A Akhlaghi Amiri, Hossein Ali
%J ADIPEC 2014 Conference
%D 2014

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