Ferrous Iron Impact on Phosphonate and Polymeric Scale Inhibitors at Temperature Ranging from 25 to 70°C

Zhang, Zhang; Zhang, Fangfu; Wang, Qiliang ‘Luke’; Bhandari, Narayan; Yan, Fei; Liu, Ya; Dai, Zhaoyi; Wang, Lu; Bolanos, Valerie; Kan, Amy T.; Tomson, Mason B.

doi:10.2118/173770-ms

Cited by 27 publications

(11 citation statements)

References 19 publications

(14 reference statements)

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“…Results shows that when Fe(II) concentration increases from 1 mg/L to 20 mg/L, DTPMP inhibition efficiency drops from 85% to 48%. The detrimental effect of Fe(II) on scale inhibitor is also found to increase with temperature and pH and shows different extent of impairment on inhibitor with different inhibitor function groups (Zhang, Zhang et al, 2015).…”

Section: Fe(ii) Influence On Scale Inhibitor Performancementioning

confidence: 94%

“…The overall experimental method used in this study is described in detail in a previous paper (Zhang, Zhang et al 2015). The experimental apparatus is sketched in Figure 1 and Figure 2.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…The experiment starts after a calculated amount of solutions are transferred from stock bottles to the glass vial. Experimental procedure for Fe(II) and Fe(III) testing is described in more detail in previous paper (Zhang, Zhang et al 2015).…”

Section: Experimental Methodsmentioning

confidence: 99%

“…Fe(II) is also found to have a detrimental effect on scale inhibitor performance, as shown in Figure 7 (Zhang, Zhang et al 2015). Inhibition efficiency in Figure 7 is defined as follows:…”

Section: Fe(ii) Influence On Scale Inhibitor Performancementioning

confidence: 99%

“…The concentration of iron can vary from several mg/L to several thousand mg/L based on reservoir geochemistry, type of hydrocarbon produced, and characteristics of the production well (Zhang, Zhang et al 2015). Due to the highly anoxic conditions down hole, most of the iron should remain as Fe(II) form.…”

Section: Introductionmentioning

confidence: 99%

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Impact of FeIII/FeII on Scale Inhibition

Zhang

Dai

et al. 2016

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Little research has been done to understand how chelating agents might reverse the effect of Fe(III)/Fe(II) on scale inhibitors in oilfield conditions. Iron ions are common cations existing in oil and gas production water. Most Fe(II) ions come from dissolution of siderite in reservoir and corrosion of steel pipes. Fe(III) in solution, can be formed by Fe(II) reduction of H 2 O, dissolution of magnetite or other Fe(III) containing minerals or when produced water is exposed to air. Both Fe(II) and Fe(III) can cause severe problems in production. Fe(II) can form FeS and FeCO 3 scale. Fe(III) can precipitate as ferric hydroxide or with Fe(II) as magnitite particles and cause damage to formation permeability. Moreover, both Fe(II) and Fe(III) have significant detrimental effects on common scale inhibitors. One of the most popular methods for iron control is the application of chelating agents, such as EDTA, NTA or citric acid, to chelate Fe(II)/Fe(III)to prevent such detrimental effects.In this work it is shown that Fe(II) and Fe(III) can significantly impair performance of common scale inhibitors such as DTPMP, PPCA and PVS. The inhibition time of DTPMP for barite can drop more than 90% in the presence of 1 mg/L Fe(II) or Fe(III)at 70°C. In this research, a mechanistic study has been done to deduce whether EDTA and citric acid can reverse the loss of scale inhibitor performance by Fe(II)/Fe(III). We find that Fe(III) impairs scale inhibitor performance by forming iron hydroxide particles which can adsorb scale inhibitors from solution. Both EDTA and citric acid are found to be able to eliminate the negative impact of Fe(III) on scale inhibitors, but through different mechanisms. EDTA works by direct chelation of Fe(III) in solution, before a solid phase is formed; while citric acid works by competitive adsorption with scale inhibitor onto ferric hydroxide particle surfaces. The impact of EDTA and citrate on reversing Fe(II) effect on scale inhibition is also discussed.

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Section: Fe(ii) Influence On Scale Inhibitor Performancementioning

confidence: 94%

“…The overall experimental method used in this study is described in detail in a previous paper (Zhang, Zhang et al 2015). The experimental apparatus is sketched in Figure 1 and Figure 2.…”

Section: Experimental Methodsmentioning

confidence: 99%

Section: Experimental Methodsmentioning

confidence: 99%

“…Fe(II) is also found to have a detrimental effect on scale inhibitor performance, as shown in Figure 7 (Zhang, Zhang et al 2015). Inhibition efficiency in Figure 7 is defined as follows:…”

Section: Fe(ii) Influence On Scale Inhibitor Performancementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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