Inhibition Of Barite Scale In The Presence Of Hydrate Inhibitors
- Mason B. Tomson (Rice U.) | Amy T. Kan (Rice U.) | Gongmin Fu (Rice U.)
- Document ID
- Society of Petroleum Engineers
- SPE Journal
- Publication Date
- September 2005
- Document Type
- Journal Paper
- 256 - 266
- 2005. Society of Petroleum Engineers
- 4.2.3 Materials and Corrosion, 4.1.2 Separation and Treating, 4.3.1 Hydrates, 6.5.4 Naturally Occurring Radioactive Materials, 4.3.4 Scale
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- 507 since 2007
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Large volumes of hydrate inhibitors [e.g., methanol, ethanol, monoethyleneglycol (MEG), and triethylene glycol (TEG) as cosolvent] are added to controlhydrate formation. Such practice has an adverse effect on scale formationbecause the mineral salts are generally less soluble in the cosolvent. Becauseof production from reservoirs, oilfield brines are often close to saturation asthey enter a well; even a small amount of added methanol, ethanol, and so on isoften sufficient to induce various minerals to precipitate, particularly thesparingly soluble minerals (e.g., barite). For example, barite solubility isreduced by as much as 20-fold with 50 wt% methanol.
In this paper, barite nucleation rates were studied over a wide range ofconcentrations, such as Ba2+ (0.5 to 1.8 mm) SO42- (0.5 to 1.8 mm) methanol (0to 40 wt%), MEG (0 to 40 wt%) or TEG (40 wt%). Barite nucleation rate issignificantly accelerated in as little as 5wt% methanol. The barite nucleationrate can be modeled with an equation modified from the classical nucleationtheory in this study. The inhibition of barite by two phosphonate inhibitorsand a polymer inhibitor in the cosolvent/brine solution is more complex. Atlower cosolvent concentrations (<30 wt%), the nucleation inhibition can bepredicted with a previously derived semi-empirical model that mathematicallyseparates the effect of added inhibitors from that of the uninhibited mineralphase. At high methanol (>30 wt%) concentration, barite nucleation may bedifficult to inhibit by scale inhibitors because of high supersaturation andthe tendency of phosphonate to be precipitated as metal salt.
Barium sulfate, BaSO4 scale, is commonly found in oil and gas wells andvarious industrial water treatment systems.It is problematic becauseBaSO4 is difficult to remove once formed.Furthermore, it is oftenenriched with radium as the result of coprecipitation.Therefore, thestudy of precipitation of BaSO4 from supersaturated solution is of bothscientific and practical importance.
|File Size||2 MB||Number of Pages||11|
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