Acoustic Diagnostics of Underwater Emissions Propagating in the Form of a Multiphase Jet

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The interaction of a pressure pulse with a gas-liquid zone, which is a section of a flooded multiphase jet consisting of a mixture of water and oil and containing a bubble core of methane, is numerically investigated. The possibility of determining the degree of expansion of the jet, the volume content of oil and gas in the jet from reflected signals is shown.

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作者简介

I. Gimaltdinov

Ufa State Petroleum Technological University

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Email: iljas_g@mail.ru
俄罗斯联邦, Ufa

M. Stolpovsky

Ufa State Petroleum Technological University

Email: iljas_g@mail.ru
俄罗斯联邦, Ufa

E. Kochanova

Ufa State Petroleum Technological University

Email: iljas_g@mail.ru
俄罗斯联邦, Ufa

参考

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2. Fig. 1. Schematic representation of the computational domain. D1–D6 – pressure sensors

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3. Fig. 2. Pressure diagrams at moments (a) - 1.62 ms, (b) - 2.5 ms, (c) – 3.5 ms. Calculation parameters: liquid – in the gas-liquid zone: a mixture of oil and water with volume contents ao0 = 0.75 and aw0 = 0.25, methane gas: ag0 = 0.001, a = 1.25 mm, x1 = 2.95 m, x2 = 3.05 m, x2l = 3.3 m, x1l = 2.7 m, x2g = 3.2 m, x1g = 2.8 m, ∆pl0 = 0.5 MPa, po00 = 830 kg/m3, pw00 = 1000 kg/m3,vo = 10-2 m2/s, vw = 10-6 m2/s, Co = 1225 m/s, Cw = 1500 m/s, pg00 = 50.19 kg/m3, cg = 2220 J/kg K, λg = 0.03 W/m K, T0 = 300 K, p0 = 7.0 MPa

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4. Fig. 3. Waveforms for sensors D3, D2, D1 having coordinates (2;2), (2;1) and (2;0) m, the letters r1 and r2 indicate the signals reflected from the boundaries “water–oil–water mixture-gas-liquid core” and “gas-liquid core-oil-water mixture- water.” All parameters are the same as for Fig. 2

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5. Fig. 4. Velocity field at 2.8 ms. The volume content of the gas is ag0 = 0.01.The other parameters are the same as in Fig. 2

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6. Fig. 5. Waveforms of reflected signals for the D3 sensor: bold lines correspond to the volume content of gas in the bubble core (a) – ag0 = 0.001 and (b) – ag0 = 0.01, thin lines correspond to the case of the absence of a bubble core in the jet (ag0 = 0). Volume content of oil and gas in the area of a multiphase jet: ao0 = 0.75, aw0 = 0.25. The other parameters are the same as in Fig. 2

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7. Fig. 6. The same as in Fig. 5. The bold line in both pictures corresponds to the case when the volume fraction of oil in the liquid phase of the bubble zone is ao0 = 0.75 (aw0 = 0.25), the thin one is ao0 = 0.25 (aw0 = 0.75). The volume content of the gas is (a) – ag0 = 0.001, (b) – ag0 = 0.01. The other parameters are the same as in Fig. 2

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