Applied Drilling Circulation Systems: Hydraulics, by Boyun Guo PhD, Gefei Liu

By Boyun Guo PhD, Gefei Liu

Used to wash the borehole, stabilize rock, regulate pressures, or increase drilling charges, drilling fluids and their circulate platforms are utilized in all levels of a drilling operation. those structures are hugely dynamic and intricate to version formerly. Written by way of an writer with over 25 years of expertise, Applied Drilling stream structures: Hydraulics, Calculations and Models supply clients with the mandatory analytical/numerical versions to address difficulties linked to the layout and optimization of competitively priced drilling movement platforms.

The merely booklet which mixes approach modeling, layout, and kit, Applied Drilling circulate platforms: Hydraulics, Calculations and Models offers a transparent and rigorous exposition of conventional and non-traditional flow platforms and kit through self contained chapters referring to approach modelling purposes. Theories are illustrated through case reviews in accordance with the author's genuine lifestyles experience.

The e-book is followed by means of an internet site which allows readers to build, validate, and run types making use of Newtonian fluids, Bingham Plastic fluids, strength legislation fluids, and aerated fluids ideas. this mixture e-book and site association will end up relatively valuable to drilling and construction engineers who have to plan operations together with pipe-tripping, running-in casing, and cementing.

  • In-depth insurance of either on- and offshore drilling hydraulics.
  • Methods for optimizing either on- and offshore drilling hydraulics.
  • Contains difficulties and strategies in response to years of experience.
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Additional resources for Applied Drilling Circulation Systems: Hydraulics, Calculations and Models

Example text

The shear stress takes a nonzero value at zero shear rate. This nonzero shear stress is called gel strength. It means that an initial force is required to deform and mobilize the fluid. Because of the plastic behavior, this type of fluid is called plastic fluid, or Bingham plastic fluid. Plastic fluids can be obtained by adding claylike solid particles to Newtonian fluids. Curve c shows a nonlinear relationship between the shear rate and the shear stress. The flow resistance increases less than linearly with deformation.

34) The turbulence criterion for Power Law fluids is based on a critical Reynolds number (N Rec) that depends on the value of the flow behavior index. 8 is circulating at 250 gpm in an 8-¾-in-diameter wellbore. 826-in ID), and in the drill pipe/hole annulus. Solution Inside the drill pipe: v = 250 = 6:98 ft/s 2:448 × ð3:826Þ2  0:8 ð2−0:8Þ = 34,788 NRe = 89,100 × 10:5 × 6:98 × 0:0416 × 3:826 20 3 + 1/0:8 NRec − Lam = 3,470 − 1,370 × 0:8 = 2,374 NRec − Tur = 4,270 − 1,370 × 0:8 = 3,174 Since NRe > 3,174, turbulent flow exists inside the drill pipe.

The threads of the drill collar connections are usually not the same as the threads at the ends of the drill pipe joint. A special crossover sub is used to connect the drill pipe to the collars. The number of drill pipe joints used depends on the depth of the borehole. Conventional drill pipe joints are not designed to work in compression. 9 A bottomhole assembly used in the petroleum industry. 10 The major components of a mud motor. 11 Drill pipe stands. 11). The length of the drill pipe stands depends on the type of drill rig used.

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