Formation of Two Calcium Diethylenetriaminepentakis(methylene phosphonic acid) Precipitates and Their Physical Chemical Properties

Kan, Amy T.; Oddo, J.E.; Tomson, Mason B.

doi:10.1021/la00017a022

Cited by 86 publications

(69 citation statements)

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“…Close to the structure phosphates are phosphonates, which are also known to form relatively insoluble metal salts. As an example, solubility product constant in the order of 10 −50 had been reported for calcium methylene phosphonate salts [14]. Preliminary analysis in this research has also confirmed the ability of phosphonate to precipitate out other toxic metals such as Cu 2+ , Pb 2+ and Zn 2+ in aqueous solutions.…”

Section: Heavy Metal Precipitation By Ppeisupporting

confidence: 71%

Heavy metal precipitation by polycation–polyanion complex of PEI and its phosphonomethylated derivative

Navarro

Wada

Takagi

2005

Journal of Hazardous Materials

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Section: Heavy Metal Precipitation By Ppeisupporting

confidence: 71%

Heavy metal precipitation by polycation–polyanion complex of PEI and its phosphonomethylated derivative

Navarro

Wada

Takagi

2005

Journal of Hazardous Materials

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“…Therefore, small changes in solution composition, due to precipitation/dissolution reactions, change the overall ionic strength only a few percentage. Such small changes in ionic strength have a negligible effect on solution phase ion activity [2,22,27]. In Fig.…”

Section: Resultsmentioning

confidence: 93%

Adsorption and precipitation of an aminoalkylphosphonate onto calcite

Kan

Tomson

2005

Journal of Colloid and Interface Science

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“…The transformation among calcium phosphonate solid phases is still unclear. Kan et al (1994) suggested that an amorphous solid initially precipitates and slowly matures into a thermodynamically stable crystalline phase after calcium mixes with phosphonate. Much higher phosphonate return concentrations at the first 10 pore volumes of return fluid (Figures 1 to 3) may indicate the initial formation of amorphous calcium phosphonate in the column.…”

Section: Figures 2 Andmentioning

confidence: 99%

Laboratory and Field Studies of Long-term Release Rates for a Solid Scale Inhibitor

et al. 2011

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Mineral scale build-up decreases permeability of the formation, reduces well productivity and shortens the lifetime of production equipment. Chemical scale inhibitors are commonly used in production wells to prevent scaling in the formation and/or in the production lines downhole and at the surface. An ideal scale inhibition treatment will last as long as possible and minimize the production interruption for treatment. In the art for introducing scale inhibitors into production wells, adding a solid scale inhibitor into the producing formation in conjunction with a hydraulic fracturing operation is often preferred to extend scale inhibition lifetime.This study quantified release rates of a solid scale inhibitor for use in fracturing treatment. Tests were conducted under dynamic conditions with various loading rates as a percentage of sand proppant. Results show that this solid derivative of a phosphonate inhibitor has a sustained long-term release profile. Inhibitor release rate gradually increases with solid inhibitor loading. However, this effect slows when the loading exceeds 5% (wt/wt).Based on the test results, a mathematical model was developed to describe the release rate profile and thereby predict the long-term behavior of inhibitor returns from initial solid inhibitor loading. Actual data collected from treated wells were compared to the mathematical model. The earliest wells treated with this type of product have achieved 5 years of production with continued effective residual chemical measured in the produced water. Other wells treated have achieved greater than 1 million barrels of produced water with continued effective residual chemical measured in the produced fluid. The data from this laboratory release study have verified that additional long-term protection can be achieved by increasing initial loading rates. IntroductionTraditionally, liquid chemical inhibitors were primarily used to control the formation of scale in oil and gas production. These chemicals can be administered through batch, continuous or squeezed applications (Szymczak et al., 2006). A main drawback of conventional squeeze treatments in a carbonate formation is that most of the acidic phosphonate inhibitor is precipitated near the formation face because the reaction of acid with carbonate and the formation of Ca-phosphonate precipitation take place very quickly. As a result, only limited reservoir protection distance can be provided near the wellbore. In a sandstone formation, the squeeze treatment depends on adsorption of the phosphonate inhibitor on the formation. Adsorption squeezes are often performed in reservoirs where a neutralized inhibitor pill solution is injected into the formation. However, compared with precipitation squeeze, little or negligible amount of inhibitor can be retained and released slowly from the formation. A large fraction of the phosphonate tends to flow back within a few days and then decreases to an extremely low value, which is not enough to effectively inhibit scale formation (Shen, et al., 200...

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Formation of Two Calcium Diethylenetriaminepentakis(methylene phosphonic acid) Precipitates and Their Physical Chemical Properties

Cited by 86 publications

References 0 publications

Heavy metal precipitation by polycation–polyanion complex of PEI and its phosphonomethylated derivative

Heavy metal precipitation by polycation–polyanion complex of PEI and its phosphonomethylated derivative

Adsorption and precipitation of an aminoalkylphosphonate onto calcite

Laboratory and Field Studies of Long-term Release Rates for a Solid Scale Inhibitor

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