2016
DOI: 10.2118/178977-pa
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Solubility and Inhibition Efficiency of Phosphonate Scale Inhibitor_Calcium_Magnesium Complexes for Application in a Precipitation-Squeeze Treatment

Abstract: Summary Scale-inhibitor (SI) squeeze treatments are applied extensively for controlling scale formation during oil and gas production. The current research involves phosphonate/metal precipitate studies in the context of precipitation-squeeze treatments. The main focus here is on the precipitation and solubility behavior of the SI_calcium (Ca)_magnesium (Mg) complexes of HEDP (a diphosphonate), DETPMP (a pentaphosphonate), and OMTHP (a hexaphosphonate); these mixed phosphonate/divalent precipita… Show more

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Cited by 18 publications
(19 citation statements)
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“…In the PAPE/calcite system, the normalized calcium concentration in PAPE/calcite system at 60 °C leveled off at ∼1, which means that all calcium generated in situ was consumed, and there was no excess calcium in solution, whereas in the same system at 80 °C, normalized [Ca 2+ ] decreased even below the baseline, which means that some calcium was consumed from the NSSW. Indeed, the calcium involved in complexation for PAPE/calcite system at 60 °C was less than that at 80 °C, meaning that less reaction occurred at lower temperature, leading to less apparent adsorption. , …”
Section: Resultsmentioning
confidence: 98%
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“…In the PAPE/calcite system, the normalized calcium concentration in PAPE/calcite system at 60 °C leveled off at ∼1, which means that all calcium generated in situ was consumed, and there was no excess calcium in solution, whereas in the same system at 80 °C, normalized [Ca 2+ ] decreased even below the baseline, which means that some calcium was consumed from the NSSW. Indeed, the calcium involved in complexation for PAPE/calcite system at 60 °C was less than that at 80 °C, meaning that less reaction occurred at lower temperature, leading to less apparent adsorption. , …”
Section: Resultsmentioning
confidence: 98%
“…For pH 0 4 at 80 °C compatibility tests (no substrate), there was no noticeable change in final pH (see Figure (a)), showing that PAPE was compatible with NSSW at these conditions. The final pH increased when the tests were repeated in the presence of 5 or 10 g of either carbonate substrate because of the dissolution of calcite or dolomite with the associated liberation of Ca 2+ (and Mg 2+ for dolomite) and carbonate (CO 3 2– ). , This trend was observed until the retention regime changed from pure adsorption to coupled adsorption/precipitation, at which point the divalent cations generated in situ were consumed by the formation of an SI–M 2+ complex. , The final pH for dolomite was higher than that of the calcite system, resulting in a greater degree of PAPE dissociation and a higher tendency for apparent adsorption (as shown in Figure (a,b)).…”
Section: Resultsmentioning
confidence: 99%
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“…Because of the strong complexing effect of their functional groups with calcium ions, the solubility of calcium ions in water can increase, which is considered to be the main reason for the scale inhibition of chemical scale inhibitors. In addition, the scale inhibitors can also adsorb on the crystal surface of the sediment, resulting in the change in the crystal form of calcium carbonate [37]. Therefore, most of the chemical scale inhibitors have both solution scale inhibition performance and surface scale inhibition performance.…”
Section: Resultsmentioning
confidence: 99%