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Download Applied Hydroaeromechanics in Oil and Gas Drilling by Eugeniy G. Leonov PDF

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By Eugeniy G. Leonov

Hydromechanical procedures underlie nearly all of know-how operations in drilling, and current a vital drawback because the velocity and intensity of drilling raises in today’s energy-hungry global. utilized Hydroaeromechanics in Oil and fuel Drilling bargains a distinct source for correctly modeling and knowing the hydrodynamic forces affecting a drilling website. Combining hydrodynamic conception with particular drilling purposes, this insurance offers readers with a entire reference for designing, making plans, and optimizing drilling operations.

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Example text

Rheological equations formulated for viscous fluids by Newton in 1685 (Krilow, 1936), for viscous-plastic media by Shvedoff in 1889 (Reiner, 1960) and Bingham in 1916 (Bingham, 1922), and for pseudoplastic media by Ostwald in 1924 (Reiner, 1960) are of profound importance in solving problems of drilling hydro-aeromechanics. With the help of these equations, formulas were obtained for pressure distribution in stationary laminar flow of viscous (Poiseuille, 1840, 1841; Stokes, 1845, 1850, 1901), viscous-plastic (Buckingham, 1921), and pseudoplastic (Rabinowitch, 1929; Mooney, 1931) fluids in circular pipes.

3 shows an annular element of the pipe. Z-axis coincides with the direction of the gravity acceleration. Now, obtain the sum of algebraic projections of mass and surface forces on z-axis. 3 Derivationof momentum (motion) equationin projectionson z-axis. 26 HYDRO-AEROMECHANIC EQUATIONS OF DRILLING PROCESSES Projections of surface forces acting at the external and internal surfaces of an elementary particle (Fig. 27), the minus sign is especially adapted to make p positive. 21) at i ¼ 1, w1 ¼ 1, wz1 ¼ w 6¼ 0, wr1 ¼ ww1 ¼ 0, tzz ¼ 0, @twz/@w ¼ 0, and trz ¼ t.

14). 14) will also be used to describe stresses in turbulent flows at consistency parameter k depending on the distance from channel walls in accordance with Prandtl–Karman hypothesis. 15). 13) for negative g_ , if for positive g_ it is experimentally estab- lished Bingham dependence tð_gÞ ¼ t0 þ h_g. SOLUTION The function tð_gÞ is odd.

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