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Influence of In-situ Stress Distribution on Selection of Fracturing Fluid Backflow Technology

100%

Zhou C., Wu X., Li H., Ren Z., Xin Y.

Acta Physica Polonica A

2016

vol. 130

issue 1

347-351

The distribution of in-situ stress has significant influence on fracture propagation direction so as to affect the selection of the fluid backflow technology. The influences on the longitudinal cracks in fracture propagation direction, caused by vertical stress distribution of the interlayer-oil layer, was firstly analyzed. Then, the settling rule of proppant within the fractures during the flowing back process was analyzed. Meanwhile, the bottomhole pressure curves under different nozzle diameters after shut-in were obtained by the volume balance principle. Therefore, the facture closure time and the maximum proppant settling distance were determined. Finally, combined with the field data, fracturing fluid backflow process, which considered the influence of in-situ stress, was optimized. Calculation shows that the location of oil layer in the in-situ stress zone and the proppant settling distance have close relations with the selection of fracturing fluid backflow technology. Hence, the optimization of fracturing fluid backflow technology requires consideration of the key factors above.

Chemical, Magnetic and X-Ray Diffraction Studies of the Sediments from Oil Field in Argentina

80%

Kopeć M., Kąc M., Bałanda M., Budziak A., Kąc S., Perzanowski M., Góra M.

Acta Physica Polonica A

2012

vol. 121

issue 2

566-570

Chemical, magnetic, and phase composition analysis of deposits taken from sedimentation tank from oil plant in Argentina was carried out. Energy dispersive spectroscopy indicates iron as a main sediment component with the site dependent fraction ranging from 11% to 78% (weight percentage). Moreover, large fractions of sulfur (4%-33%), oxygen (8%-28%), calcium (1%-14%), and silicon (1%-11%) were found. The chemical analysis performed with wet chemical methods also indicated Fe as a main component (about 35%), additionally a large fraction ( ≈ 15%) of the sulfur and under 10% fractions of calcium ( ≈ 7%), carbon ( ≈ 6%), and silicon ( ≈ 5%) were found in the sample. The phase composition studies performed using X-ray diffraction showed magnetite - Fe_3O_4, goethite - α-FeOOH, lepidocrocite - γ-FeOOH, siderite - FeCO_3, and iron-sulfur compounds (mackinawite - FeS, stoichiometric FeS, greigite - Fe_3S_4) and other compounds like aragonite - CaCO_3, calcite - CaCO_3, anorthite - CaAl_2Si_2O_8, quartz - SiO_2 and barium sulphate Ba(SO_3)_{0.3}(SO_4)_{0.7}. Studies performed by the Mössbauer spectroscopy, confirmed presence of majority of compounds identified by X-ray diffraction. Magnetic AC susceptibility measurements show that magnetite is a main component of the studied deposit. High concentration of the magnetic compounds deposited in the sedimentation tank points to the advisability to install the magnetic device designed to support water treatment processes, i.e.: flocculation, coagulation, sedimentation, and filtration. This device could simultaneously inhibit microbiological and chemical corrosion.

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2 Acta Physica Polonica A

1 2016

1 2012

1 Bałanda M.

1 Budziak A.

1 Góra M.

1 Kopeć M.

1 Kąc M.

1 Kąc S.

1 Li H.

1 Perzanowski M.

1 Ren Z.

1 Wu X.

1 Xin Y.

1 Zhou C.

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Influence of In-situ Stress Distribution on Selection of Fracturing Fluid Backflow Technology

Chemical, Magnetic and X-Ray Diffraction Studies of the Sediments from Oil Field in Argentina