SPE Journal
Volume 15,
Number 2,
June 2010,
pp. 294-300
Summary
This work was intended to study the interaction between ferrous-iron and
calcium ions simultaneously toward carbonate ions in supersaturated solution in
a continuous stirred tank reactor (CSTR) and to establish an acceptable
experimental design as a preparation step to study the kinetics of other types
of ferrous iron salts. The experiments were conducted in 0.5 M NaCl solution at
55°C. The pH values were between 6.2 and 7.8. It was found that calcium ions
have a strong influence in increasing the solubility of iron carbonate. On the
other hand, ferrous iron did not affect the solubility of calcium carbonate
significantly. This might be caused by increasing the stability of ferrous iron
carbonate complexes in the presence of calcium. Also, the molar ratios of
calcium to iron in the solution were compared with their molar ratios in the
precipitated salts. It was found that the relation was greater than unity;
Rsolid/Rsolution = 2.39. Thus, calcium
carbonate has a preference to precipitate. This result seems to be in agreement
with water dissolution rates of divalent ions and also with reaction-rate
constants of iron carbonate and calcium carbonate reported in the
literature.
© 2010. Society of Petroleum Engineers
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History
- Original manuscript received:
23 February 2009
- Meeting paper published:
20 April 2009
- Revised manuscript received:
28 July 2009
- Manuscript approved:
5 October 2009
- Published online:
11 March 2010
- Version of record:
17 June 2010
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