Setting a Balanced Cement Plug

Basic procedure:

  • a) Pump water spacer
  • b) Pump slurry
  • c) Pump water spacer
  • d) Displace with mud {either (i) underdisplace or (ii) balanced)
  • e) Pull stinger slowly and do not rotate string (will disturb cement)

CALCULATE

  • a) Quantity of cement and mixwater required
  • b) Thickening time and compressive strength

Prior to withdrawal of stinger determine:

  • c) Height of cement column
  • d) Height of water spacer ahead of slurry
  • e) Volume of water required behind slurry to achieve a balanced condition
  • f) Chase volume

CALCULATIONS

The following calculations are for setting a plug in open hole only (i.e. one size of annulus). The water spacer ahead is also considered to be in open hole/tubing stringer annulus (i.e. one size of annulus). If more than one annulus exists then the calculations will have to be adjusted.

(a) Quantity of cement and mixwater required Vc = Cap0H x Length of plug

(b) Thickening time and compressive strength See Halliburton Cementing Tables

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