The Effect of pH, Calcium, and Temperature on the Adsorption of Phosphonate Inhibitor Onto Consolidated and Crushed Sandstone

Sorbie, K.S.; Jiang, Ping; Yuan, M.D.; Chen, Ping; Jordan, M.M.; Todd, A.C.

doi:10.2523/26605-ms

Cited by 7 publications

(12 citation statements)

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“…(iv) At the same time through the acidity, the system is coupled to the carbonate system in solution and solid (CaCO 3 ). To understand this fully, it must be modeled as an equilibrium system of coupled equations describing these parts i to iv above, and some progress has been made on this as described in ref . However, in outline, an approximate chemical explanation of the observations can be sene as explained in the following conclusion.…”

Section: Discussionmentioning

confidence: 99%

“…Finally, the adsorption of a phosphonate inhibitor (DETPMP) decreased predictably at higher pH (at 25 °C) in the absence of Ca 2+ ions. 31 Ibrahim et al investigated static compatibility and coupled adsorption/precipitation experiments using a range of phosphonate SIs and several mineral substrates. They concluded that for all phosphonate SI/mineral systems, pure adsorption observed at low [SI] concentrations would correctly describe the SI/mineral retention mechanism, while coupled adsorption/ precipitation occurs at high concentrations and a coupled adsorption/precipitation (Γ/Π) model would be required.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Moreover, inhibitor adsorption was lower at pH 0 4 than at pH 0 2 or 6, when calcium ions were present. Finally, the adsorption of a phosphonate inhibitor (DETPMP) decreased predictably at higher pH (at 25 °C) in the absence of Ca 2+ ions . Ibrahim et al investigated static compatibility and coupled adsorption/precipitation experiments using a range of phosphonate SIs and several mineral substrates.…”

Section: Introductionmentioning

confidence: 99%

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Mechanistic Investigation of Adsorption Behavior of Two Scale Inhibitors on Carbonate Formations for Application in Squeeze Treatments

Jarrahian

Sorbie

2020

Energy Fuels

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Understanding the mechanisms of scale inhibitor (SI) retention in carbonate formations is key to designing efficient SI "squeeze" treatments in oil reservoirs. By performing "apparent adsorption" experiments, this paper demonstrates that a coupled adsorption/precipitation (Γ/Π) retention mechanism dominates in calcite and limestone for two widely applied scale inhibitors, DETPMP and PPCA. Precipitation was a more dominant retention mechanism at both initial pH values (pH 0 4 and 6) and T = 80 and 95 °C for both SIs. At 95 °C, the pure adsorption (Γ) region only extends up to [SI] ∼ 100 ppm, above which precipitation (Π) dominates. At lower temperatures (T = 80 °C), the solubility of the SI−M 2+ complex increases, resulting in less precipitation. The apparent adsorption results are supplemented by measuring the corresponding solution [Ca 2+ ], pH values in solution, and environmental scanning electron microscopy/energy dispersive X-ray analysis (ESEM/EDX) and particle size analysis (PSA), which give us a full mechanistic explanation of our results. For DETPMP, the retention increased as the solution pH increased, while retention of PPCA increased as the test pH decreased. Moreover, DETPMP was retained more than PPCA due to their differences in chemistry. Furthermore, the retention of both SIs was greater for the limestone sample due to Fe 2+ traces enhancing the precipitate of SI−M 2+ .

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Section: Discussionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Mechanistic Investigation of Adsorption Behavior of Two Scale Inhibitors on Carbonate Formations for Application in Squeeze Treatments

Jarrahian

Sorbie

2020

Energy Fuels

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“…28−30 Both mechanisms can occur concurrently depending upon the chemical nature of the inhibitor and on formation parameters such as mineralogy, divalentcation concentration, pH, and temperature. 31 The first detailed mechanistic study on SI retention was conducted by Vetter. 32 It was found that the "adsorption isotherms" of sand at different pH values at low temperature were almost identical, and there was a very small increase at higher pH.…”

Section: ■ Introductionmentioning

confidence: 99%

“…32 It was found that the "adsorption isotherms" of sand at different pH values at low temperature were almost identical, and there was a very small increase at higher pH. Sorbie et al 31 investigated the impact of pH, temperature, and calcium on the retention of phosphonate scale inhibitors onto consolidated and crushed sandstone. They showed that scale-inhibitor adsorption onto the crushed rock material increased at higher temperatures.…”

Section: ■ Introductionmentioning

confidence: 99%

Experimental Investigation of the Interaction between a Phosphate Ester Scale Inhibitor and Carbonate Rocks for Application in Squeeze Treatments

et al. 2019

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Studying the interaction between scale inhibitors (SIs) and chemically reactive carbonate minerals is crucial for determining SI retention in “squeeze” treatments. This study investigated the retention of the environmentally friendly SI, polyhydric alcohol phosphate ester (PAPE), on calcite and dolomite substrates. Elemental analysis of the supernatant solution as well as pH measurement and environmental scanning electron microscopy (ESEM) with energy dispersive X-ray analysis (EDX) were all used to investigate SI retention and to identify the morphology/composition of the resultant SI–Ca precipitates. Results revealed that PAPE was retained by calcite via pure adsorption at an initial test pH (pH0) of 4 and then precipitated at pH0 6. In contrast, the PAPE/dolomite system was found to be effectively pH-independent, with precipitation dominating at both pH0 values. Any temperature effect was negligible for dolomite/PAPE retention, whereas with calcite, retention was smaller at lower temperature, which is attributed to the temperature-dependence of the substrate solubility. Overall, the final pH of the system and the resulting degree of SI dissociation contributed more to PAPE retention than did the final calcium concentration. EDX analysis confirmed scale-inhibitor phosphorus in the deposited solids, indicating coupled adsorption/precipitation. This phosphorus increased with the amount of precipitation and with the temperature, confirming the corresponding static adsorption test results.

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Experimental Analysis of Scale Inhibitors Retention in Carbonate Formations for Application in Squeeze Treatments

et al. 2022

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In this work, static adsorption/precipitation (Γ/Π) experiments were conducted for two widely used scale inhibitors (DETPMP and VS-Co) using two different size fractions of Moroccan calcite (315–500 and 125–250 μm) to study the effect of particle size on the “apparent adsorption” of these SIs onto carbonate. The reason for performing these experiments at two particle size ranges was to determine whether the relative surface area to volume ratios (as presented as particle size) would affect whether the precipitating SI–Ca complex forms as a “skin” on the mineral surface and, if so, to determine whether this “skin” could affect the further interaction between the SI and the carbonate mineral by a “surface poisoning” effect. The results of both environmental scanning electron microscopy/energy dispersive X-ray analysis (ESEM/EDX) and direct particle size analysis (PSA) clearly showed that no (or very little), such surface deposition or coating around calcite grains occurred for either of these SIs. Essentially, the results for both particle sizes were qualitatively the same for each of the SIs. The DETPMP retention showed coupled Γ/Π behavior, which was predominantly precipitation at [DETPMP] > 100 ppm and was quantitatively almost the same for both calcite particle sizes. Likewise, the results for VS-Co were quantitatively almost identical for both particle sizes and the retention was predominantly via adsorption up to [VS-Co] ≈ 3000 ppm, with some small degree of precipitation at higher concentration observed. The rather different behavior of DETPMP and VS-Co may be ascribed to different functional groups having different pK a values and strengths of SI–Ca binding. Both sets of static adsorption/precipitation experimental results for DETPMP and VS-Co on each calcite particle size fraction were also predicted using a previously published model.

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The Effect of pH, Calcium, and Temperature on the Adsorption of Phosphonate Inhibitor Onto Consolidated and Crushed Sandstone

Cited by 7 publications

References 0 publications

Mechanistic Investigation of Adsorption Behavior of Two Scale Inhibitors on Carbonate Formations for Application in Squeeze Treatments

Mechanistic Investigation of Adsorption Behavior of Two Scale Inhibitors on Carbonate Formations for Application in Squeeze Treatments

Experimental Investigation of the Interaction between a Phosphate Ester Scale Inhibitor and Carbonate Rocks for Application in Squeeze Treatments

Experimental Analysis of Scale Inhibitors Retention in Carbonate Formations for Application in Squeeze Treatments

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