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A drilling rig uses a hoisting system to drill wellbores

A drilling rig uses a hoisting system to drill wellbores. After drilling a 25,000 ft well, it is established that the drilling bit needs to be replaced by tripping out (i.e. pulling out). The available engine horsepower for this operation is 3500 hp.

    1. Considering the following data, estimate the maximum travelling block speed when the length of drilling string is 1500ft.
      1. Average drag force is 0.0025 ๐‘™๐‘๐‘“/๐‘“๐‘ก per 1 ๐‘“๐‘ก/๐‘š๐‘–๐‘› speed of drillstring,
      2. Weight per foot drill pipe = 22 lbf/ft,
  • Weight per foot of drill collar = 170 lbf/ft,
  1. Length of Drilling collar= 1200 ft,
  2. Mud weight is 10 ppg,
  3. Hoist efficiency is 79%
  • Drawworks efficiency is 81%.
  • Drillstring density is 65.5 ppg
  1. Neglect the weight of the bit.
  2. While pulling the drilling string out of the well, a fracture is created at the depth of 2000 ft where pore pressure is 880 psi and mud loss occurs until pressure equalises at that depth. Determine the height of mud column in the well after losing mud into the fracture.
  3. Redo part A considering the calculated mud height in part B.

Reservoir properties distribution for a typical reservoir within the pay thickness interval

Reservoir properties distribution for a typical reservoir within the pay thickness interval 10653 -10686ft is given in below. A cut-off permeability of 20 mD was applied throughout the distribution. Reservoir pressure and bottomhole pressures are 3000 psia and 2000 psia respectively. Wellbore and external drainage radius are 0.3 ft and 2500 ft while oil viscosity is 2.5 cP. Calculate the following:

    1. Production rate (bbl/day)
    2. Productivity index (PI), if the pressure drawdown is 800 psia. (15 Marks)

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Permeability values for depth interval 10653-10686 ft

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Depth Interval (ft) Permeability (mD)
10653 – 10657 58
10657 – 10663 18
10663 – 10669 55
10669 – 10675 65
10675 โ€“ 10680 70
10680 – 10686 72

An offshore platform producing reservoir fluid of 7000 Scf/STB

An offshore platform producing reservoir fluid of 7000 Scf/STB and basic sediment content of 2%. As the surface facility engineer, suggest an appropriate separator to be used on the platform.