Limits...
Characterizing and Exploring the Formation Mechanism of Salt Deposition by Reusing Advanced-softened, Silica-rich, Oilfield-produced Water (ASOW) in Superheated Steam Pipeline.

Dong B, Xu Y, Lin S, Dai X - Sci Rep (2015)

Bottom Line: In addition, the solubility of the deposition was about 99%, suggesting that it is very different from traditional scaling.The results of a simulation experiment and thermal analysis system (TGA and TG-FTIR) proved that Na2CO3 and Si(OH)4 (gas) are involved in the formation of Na2Si2O5, which is ascribed mainly to the temperature difference between the superheated steam and the pipe wall.These findings provide an important reference for improving the reuse of ASOW and reducing its deposition.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, Shanghai, 200092, China.

ABSTRACT
To dispose of large volumes of oilfield-produced water, an environmentally friendly method that reuses advanced-softened, silica-rich, oilfield-produced water (ASOW) as feedwater was implemented via a 10-month pilot-scale test in oilfield. However, salt deposition detrimental to the efficiency and security of steam injection system was generated in superheated steam pipeline. To evaluate the method, the characteristics and formation mechanism of the deposition were explored. The silicon content and total hardness of the ASOW were 272.20 mg/L and 0.018 mg/L, respectively. Morphology and composition of the deposition were determined by scanning electron microscope-energy dispersive spectrometry (SEM-EDS), inductively coupled plasma-mass spectroscopy (ICP-MS), X-ray diffraction (XRD), laser Raman spectroscopy (LRS) and X-ray photoelectron spectroscopy (XPS). Na2Si2O5, Na2CO3 and trace silanes were identified in the deposition. In addition, the solubility of the deposition was about 99%, suggesting that it is very different from traditional scaling. The results of a simulation experiment and thermal analysis system (TGA and TG-FTIR) proved that Na2CO3 and Si(OH)4 (gas) are involved in the formation of Na2Si2O5, which is ascribed mainly to the temperature difference between the superheated steam and the pipe wall. These findings provide an important reference for improving the reuse of ASOW and reducing its deposition.

No MeSH data available.


Elemental composition of samples SD-1, SD-2 and SD-3: (a) elemental percentage in powder samples by EDS analysis; (b) elemental content of digested samples by ICP-MS analysis.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC4660299&req=5

f1: Elemental composition of samples SD-1, SD-2 and SD-3: (a) elemental percentage in powder samples by EDS analysis; (b) elemental content of digested samples by ICP-MS analysis.

Mentions: SEM images and the raw EDS data for the powder samples (SD-1, SD-2 and SD-3) and ICP-MS data for the digested powder samples are summarised in the Supplementary Information (Figure S6 and Tables S5 and S6). The EDS and ICP-MS analysis indicated that the most frequently detected elements in the salt deposition were O, Si, Na, C and a small quantity of Al (Fig. 1 (a,b)). As shown in Fig. 1, there were no obvious differences in the elemental content of the SD-1, SD-2 and SD-3 samples. The mole percentages of the four main elements (O, Si, Na and C) in the salt depositions were about 52.0%, 18.6%, 21.3% and 7.9%, respectively. In addition, the Na content was about 190 mg/g and the molar ratio of Na/Si was about 1.6 (Fig. 1(b)).


Characterizing and Exploring the Formation Mechanism of Salt Deposition by Reusing Advanced-softened, Silica-rich, Oilfield-produced Water (ASOW) in Superheated Steam Pipeline.

Dong B, Xu Y, Lin S, Dai X - Sci Rep (2015)

Elemental composition of samples SD-1, SD-2 and SD-3: (a) elemental percentage in powder samples by EDS analysis; (b) elemental content of digested samples by ICP-MS analysis.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4660299&req=5

f1: Elemental composition of samples SD-1, SD-2 and SD-3: (a) elemental percentage in powder samples by EDS analysis; (b) elemental content of digested samples by ICP-MS analysis.
Mentions: SEM images and the raw EDS data for the powder samples (SD-1, SD-2 and SD-3) and ICP-MS data for the digested powder samples are summarised in the Supplementary Information (Figure S6 and Tables S5 and S6). The EDS and ICP-MS analysis indicated that the most frequently detected elements in the salt deposition were O, Si, Na, C and a small quantity of Al (Fig. 1 (a,b)). As shown in Fig. 1, there were no obvious differences in the elemental content of the SD-1, SD-2 and SD-3 samples. The mole percentages of the four main elements (O, Si, Na and C) in the salt depositions were about 52.0%, 18.6%, 21.3% and 7.9%, respectively. In addition, the Na content was about 190 mg/g and the molar ratio of Na/Si was about 1.6 (Fig. 1(b)).

Bottom Line: In addition, the solubility of the deposition was about 99%, suggesting that it is very different from traditional scaling.The results of a simulation experiment and thermal analysis system (TGA and TG-FTIR) proved that Na2CO3 and Si(OH)4 (gas) are involved in the formation of Na2Si2O5, which is ascribed mainly to the temperature difference between the superheated steam and the pipe wall.These findings provide an important reference for improving the reuse of ASOW and reducing its deposition.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, Shanghai, 200092, China.

ABSTRACT
To dispose of large volumes of oilfield-produced water, an environmentally friendly method that reuses advanced-softened, silica-rich, oilfield-produced water (ASOW) as feedwater was implemented via a 10-month pilot-scale test in oilfield. However, salt deposition detrimental to the efficiency and security of steam injection system was generated in superheated steam pipeline. To evaluate the method, the characteristics and formation mechanism of the deposition were explored. The silicon content and total hardness of the ASOW were 272.20 mg/L and 0.018 mg/L, respectively. Morphology and composition of the deposition were determined by scanning electron microscope-energy dispersive spectrometry (SEM-EDS), inductively coupled plasma-mass spectroscopy (ICP-MS), X-ray diffraction (XRD), laser Raman spectroscopy (LRS) and X-ray photoelectron spectroscopy (XPS). Na2Si2O5, Na2CO3 and trace silanes were identified in the deposition. In addition, the solubility of the deposition was about 99%, suggesting that it is very different from traditional scaling. The results of a simulation experiment and thermal analysis system (TGA and TG-FTIR) proved that Na2CO3 and Si(OH)4 (gas) are involved in the formation of Na2Si2O5, which is ascribed mainly to the temperature difference between the superheated steam and the pipe wall. These findings provide an important reference for improving the reuse of ASOW and reducing its deposition.

No MeSH data available.