Well Control – Abnormal pore pressures

Well Control - Abnormal pore pressures For exploratory well, the prediction of abnormally pressured formations can be difficult. Correlation with nearby wells will provide the most reliable information. Before drilling a wildcat, seismic data will generally be the only source of information regarding abnormal pore pressures.

Different indications of abnormal pore pressures will be observed in clastic and impermeable formations:

Indications of abnormal pressures in clastic formations (e.g. unconsolidated sands):

  • Actual kick
  • Drop in circulating pressure (Good).
  • Increased drilling rate, called a "drilling break", (Good).
  • Increased pit level (Good, but . . .

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