Precipitation and Dissolution of Calcium−ATMP Precipitates for the Inhibition of Scale Formation in Porous Media

Pairat, R.; Sumeath, C.; Browning, Frank; Fogler, H. Scott

doi:10.1021/la9608425

Cited by 49 publications

(34 citation statements)

References 6 publications

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“…ATMP is known to form insoluble compounds with calcium ions [24,25,27,28]. Thus it was reasonable to study the binary Ca-ATMP system light scattering under the large excess of calcium ions over ATMP.…”

Section: Ca -Atmp Equilibria Studymentioning

confidence: 99%

DLS study of a phosphonate induced gypsum scale inhibition mechanism using indifferent nanodispersions as the standards for light scattering intensity comparison

2018

Int. J. Corros. Scale Inhib.

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The dynamic light scattering (DLS) special technique is used to study the bulk supersaturated gypsum aqueous solutions during the induction period in 0.2 mol·dm -3 NaCl at pH 9 and 25°C. It is based on the standard SiO 2 nanoparticles (Ludox TM40) injection into the supersaturated gypsum solution. These nanoparticles act as an internal indifferent light scattering intensity reference and provide a semiquantitative measurement of a relative gypsum particles content in a blank solution and in the system treated with aminotris(methylenephosphonic acid), ATMP. It is found that ATMP sufficiently reduces the number of gypsum nuclei, spontaneously formed in the supersaturated solutions. In a parallel way the chemical forms of antiscalant in the experimental systems have been modeled. A tentative nonconventional mechanism of scale inhibition is proposed. It assumes that the active crystal formation centers already exist in any analytical grade aqueous solution in the form of solid nanoimpurities with a size ranging from one to several hundred nm. The ATMP antiscalant competes with Ca 2+ and 2 4 SO  for these centers and blocks them. Therefore the number of gypsum growth centers diminishes significantly. Thus the concentration of corresponding CaSO 4 ·2H 2 O particles gets reduced at least 10-fold. The collision rate of such particles decreases 100-fold. This explains both induction time prolongation by ATMP and sub-stoichiometry of its efficacy.

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Section: Ca -Atmp Equilibria Studymentioning

confidence: 99%

DLS study of a phosphonate induced gypsum scale inhibition mechanism using indifferent nanodispersions as the standards for light scattering intensity comparison

2018

Int. J. Corros. Scale Inhib.

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“…Following this observation, low solubility phase of calcium phosphonate precipitates were reported for other common phosphonate inhibitor such as, NTMP, and polyphosphinocarboxylic acid (PPCA) by the same approach (Xiao et al 2001;Kan et al 2003). Fogler and his co-worker (Browning and Fogler 1996;Pairat et al 1997) demonstrated different Ca-HEDP and Ca-ATMP precipitates by changing the pH and calcium-tophosphonate molar ratios. In addition, Jonasson et al (Jonasson et al 1996) observed that high temperature can favor the formation of calcium phosphonate precipitates.…”

Section: Introductionmentioning

confidence: 87%

Attchment/Release of Phosphonate to/from a CaCO Surface in Supersaturated Brines

Zhang¹,

Kan²,

Tomson³

2014

SPE International Oilfield Scale Conference and Exhibition

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One of the most intractable concerns when engineers try to reuse the produced water as frac fluid in the Bakken and some other shale plays is the scale formation caused by the incompatibility of produced water with additives in the frac fluids and with the formation. In order to obtain a more efficient scale treatment for a successful hydraulic fracing that handles the extraordinary amount of water with high supersaturation level, the better understanding of inhibitor retention and release in the production system is urgent.To explore the mechanism of attachment/release of phosphonate to/from a mineral surface, calcite supersaturated feed solutions with different diethylenetriamine penta (DTPMP) concentrations were introduced into the steel tubing that was internally pre-coated with a thin layer of CaCO 3 . It is unveiled that DTPMP attachment was dominated by the precipitation of calcium phosphonate solid once the solution is supersaturated with Ca 3 H 4 DTPMP (pKspϭ53.5), and the total amount of DTPMP attached on the calcite surface added up with the increasing supersaturation of Ca 3 H 4 DTPMP. The co-precipitation of CaCO 3 and Ca 3 H 4 DTPMP has facilitated the attachment of the inhibitor with the increase of supersaturation of CaCO 3 . The retained phosphonate was released from the surface with a steady and low level inhibitor concentration over extended period of time. Combining with the kinetics of calcium carbonate precipitation in the presence of inhibitor, a 1500 gram of calcium phosphonate precipitation can protect the scaling for about 100 days (100 bbl/day) when the saturation index of calcium carbonate (SI calcite ) is as high as 1.3.The results provide a better understanding of calcium-phosphonate-carbonate interaction, and show the phosphonate inhibitor can continuously accumulate on the carbonate and slowly dissolve. We anticipate this study can shed a light on how much inhibitor can be delivered to the unconventional reservoir as well as the theoretical limitation of inhibitor return in the flowback water.

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“…The procedure is repeated until a 60-80% decrease of permeability is reached. From time to time, small amounts of solution are sampled from the outflow port of the equipment, and the pH is measured, [7]. The pH of the feed solutions is adjusted in the range 6-7 so that the formation of the desired phase of calcium phosphate is favored.…”

Section: Experiments In Packed Bedsmentioning

confidence: 99%

“…Consolidation of the formation is obtained through in situ precipitation of calcium phosphate within the granular stratum, achieved by alternating injection, mixing, and reaction of two aqueous solutions of calcium chloride and potassium phosphate. Visual observations for the in situ precipitation and dissolution of an inorganic salt in glass porous micromodels are reported in the work of Fogler and his co-workers (6,7). Emphasis in these works is given in the precipitation of phosphonates that are used to prevent scale nucleation/crystal growth processes in scale-prevention treatments.…”

Section: Introductionmentioning

confidence: 99%

Sandbed Consolidation with Mineral Precipitation

Paraskeva

Charalambous

Stokka³

et al. 2000

Journal of Colloid and Interface Science

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Precipitation and Dissolution of Calcium−ATMP Precipitates for the Inhibition of Scale Formation in Porous Media

Cited by 49 publications

References 6 publications

DLS study of a phosphonate induced gypsum scale inhibition mechanism using indifferent nanodispersions as the standards for light scattering intensity comparison

DLS study of a phosphonate induced gypsum scale inhibition mechanism using indifferent nanodispersions as the standards for light scattering intensity comparison

Attchment/Release of Phosphonate to/from a CaCO Surface in Supersaturated Brines

Sandbed Consolidation with Mineral Precipitation

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