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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.

Calculations of the Atomic Structure for Fe XVII Lines

86%

Zhou C., Cao J.-J., Liang L., Yu G.-H., Wang Z.-M., He H.-Y.

Acta Physica Polonica A

2016

vol. 129

issue 6

1109-1117

Energy levels, line strengths, oscillator strengths, radiative decay rates and fine structure collision strengths are presented for sixteen-times ionized iron (Fe XVII). The atomic data are calculated with the AUTOSTRUCTURE code, where relativistic corrections are introduced according to the Breit-Pauli distorted wave approach. The calculations of atomic data for 89 fine-structure levels generated from eleven configurations 2s²2p⁶, 2s²2p⁵ (3s, 3p, 3d), 2s²2p⁵ (4s, 4p, 4d, 4f) and 2s¹2p⁶ (3s, 3p, 3d) of the Ne-like Fe ion are presented. Fine structure collision strengths for transitions from the ground and the first four excited levels are presented at four electron energies: 75, 125, 175, and 250 Ry. These atomic structure data are compared with the available experimental and theoretical results.

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2 Acta Physica Polonica A

2 2016

2 Zhou C.

1 Cao J.-J.

1 He H.-Y.

1 Li H.

1 Liang L.

1 Ren Z.

1 Wang Z.-M.

1 Wu X.

1 Xin Y.

1 Yu G.-H.

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

Calculations of the Atomic Structure for Fe XVII Lines