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Keywords: calcium
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Proceedings Papers

Paper presented at the SPE International Oilfield Scale Conference and Exhibition, May 14–15, 2014
Paper Number: SPE-169769-MS
... Table 1 Brine chemistries for calcium carbonate scaling tests Formation Water (ppm) Water-1 Water-2 Water-3 Na + 2000 10600 12257 Ca 2+ 8200 700 110 Mg 2+ 50 50 50 Cl - 17630 17330 14076 HCO 3 - 150 700 3000 pH 7.2 7.7...
Proceedings Papers

Paper presented at the SPE International Oilfield Scale Conference and Exhibition, May 14–15, 2014
Paper Number: SPE-169779-MS
... Penta Methylene Phosphonic (DETPMP), a commonly used commercial scale inhibitor (SI), when in contact with brine and calcium carbonate (CaCO 3 ). These tests are carried out at pH 2 and pH 4 and at a range of DETPMP concentrations from 0ppm to 5000 ppm. In these tests, the addition of disaggregated CaCO...
Proceedings Papers

Paper presented at the SPE International Conference on Oilfield Scale, May 30–31, 2012
Paper Number: SPE-155255-MS
..., with a focus on scale management to identify positive and negative aspects of each one. This work has identified that in fields with reservoir temperatures above 120°C and calcium concentrations above 7000 mg/l, significant sulphate stripping occurs due to anhydrite precipitation. This effect is...
Proceedings Papers

Paper presented at the SPE International Conference on Oilfield Scale, May 26–27, 2010
Paper Number: SPE-130374-MS
... Subsequently, this experiment was repeated using brine containing no barium, no strontium and no sulphate ions to eliminate the possibility of barite, celestite or calcium sulphate forming. Therefore, any measured decreases in brine calcium must be due exclusively to precipitation with SI...
Proceedings Papers

Paper presented at the SPE International Oilfield Scale Conference, May 28–29, 2008
Paper Number: SPE-114064-MS
... Abstract Little attention has been paid to the reaction of mixed calcium-iron carbonate in solutions in comparison with the reaction of other solids such as calcium carbonate, calcium sulfate and barium sulfate. As a result, little information is presently available about the interaction and...
Proceedings Papers

Paper presented at the SPE International Oilfield Scale Conference, May 28–29, 2008
Paper Number: SPE-114109-MS
... for Calcium Sulfate that can be formed in the membrane as a consequence of the concentration of the seawater in the SRU. The feed, permeate and concentrate fluids of the SRU were characterized. The chemical composition of the seawater in the polarization region (fluid located in the membrane surface...
Proceedings Papers

Paper presented at the SPE International Oilfield Scale Symposium, May 31–June 1, 2006
Paper Number: SPE-100515-MS
... Abstract In previous work (SPE 87447), the effect of pH on phosphonate/carbonate interaction was studied by performing variable pH core floods in short outcrop carbonate cores. Effluent concentrations of scale inhibitor (DETPMP), lithium tracer, calcium and magnesium were measured, as were the...
Proceedings Papers

Paper presented at the SPE International Oilfield Scale Symposium, May 31–June 1, 2006
Paper Number: SPE-100516-MS
... Abstract While barium stripping is commonly observed in sandstone reservoirs where seawater mixes with formation water that may be rich in calcium, strontium and barium ions, this paper presents evidence for in situ sulphate stripping in a sandstone reservoir. The formation brine composition...
Proceedings Papers

Paper presented at the SPE International Oilfield Scale Symposium, May 31–June 1, 2006
Paper Number: SPE-100517-MS
... (calcium content, acid distribution, presence of other chemical families) of these samples. These were suggested to be related also to crude oil chemistry changes and mitigation (chemical) strategies used. The implications of these new findings on the basic mechanisms of soap formation are discussed...
Proceedings Papers

Paper presented at the SPE International Oilfield Scale Symposium, May 31–June 1, 2006
Paper Number: SPE-100598-MS
... Abstract A new method to prevent sand permeation from unconsolidated or poorly consolidated reservoir formations has been developed. The Quasi Natural Consolidation (QNC)-method involves a controlled in situ precipitation of calcium carbonate scale on sand grains. Experiments show that calcium...
Proceedings Papers

Paper presented at the SPE International Symposium on Oilfield Scale, May 11–12, 2005
Paper Number: SPE-95127-MS
... asphaltene inhibition bottle test upstream oil & gas reactor hp ht condition calcium concentration dissolver calcium dissolution test condition normalised calcium concentration calcium carbonate scale remediation oilfield chemistry scale dissolver application scale dissolver...
Proceedings Papers

Paper presented at the SPE International Symposium on Oilfield Scale, May 26–27, 2004
Paper Number: SPE-87470-MS
... paraffin remediation lattice concentration hydrate inhibition inhibition mechanism hydrate remediation magnesium scale remediation asphaltene inhibition efficiency oilfield chemistry inhibition efficiency wax inhibition crystal growth retardation calcium inclusion mechanism wax...
Proceedings Papers

Paper presented at the SPE International Symposium on Oilfield Scale, May 26–27, 2004
Paper Number: SPE-87455-MS
... Abstract This paper describes laboratory and modeling work to utilize high-sulfate pit brine and calcium chloride solutions as a means to the permeability of water producing zones. The study included compatibility tests, coreflood experiments, and scale prediction to calculate SI and SA at...
Proceedings Papers

Paper presented at the International Symposium on Oilfield Scale, January 29–30, 2003
Paper Number: SPE-80402-MS
... Abstract Calcium carbonate scale was detected in the majority of wet producers in a tight carbonate reservoir in the northern part of Saudi Arabia. Extensive lab work indicated that a phosphonate-type scale inhibitor was effective in mitigating carbonate scale, as well as sulfate scale that...
Proceedings Papers

Paper presented at the International Symposium on Oilfield Scale, January 30–31, 2002
Paper Number: SPE-74667-MS
... barite dissolver asphaltene inhibition acid naoh concentration ion concentration carboxylic acid naoh concentration wax inhibition organic acid scale inhibition asphaltene remediation dissolution capacity calcium dissolver system naoh 0 production chemistry remediation of hydrates...
Proceedings Papers

Paper presented at the International Symposium on Oilfield Scale, January 30–31, 2001
Paper Number: SPE-68314-MS
... inhibition scale inhibitor application wax remediation concentration selection calcium scale remediation reservoir inhibitor concentration oilfield chemistry remediation of hydrates ph 5 ppm asphaltene remediation paraffin remediation core flood scale inhibition reduction thermal stability...
Proceedings Papers

Paper presented at the International Symposium on Oilfield Scale, January 26–27, 2000
Paper Number: SPE-60218-MS
... and CaCO3 scale and no precipitation when in contact with high levels of calcium ions. The last objective but not the least is the adsorption of the copolymer on the rock. This property is necessary for using the anti-scale additive in squeeze. For the polymers which answered at the first three...

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