What is it about?
Subsurface Pore pressure usually increases with depth. The presence of structural feature within the oil/gas trap causes a pressure regression (retreat) instead of transgression. If mud pressure is excessively higher than the reservoir pressure, lost mud circulation takes place and causes the oil bearing reservoir to be damaged.
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Why is it important?
It is very important to recognize this phenomenon before drilling deep to a high pressure reservoir and condition the mud weight accordingly. The wire-line measurement tools can't detect hydrocarbon in a damaged formation. Consequently, the whole project can be abandoned based on false measurement.
Perspectives
It is important to create a pore pressure profile from seismic velocity before drilling. Correlating this profile with the post stack seismic semblance along the bore-hole trajectory can help avoiding plugging and abandonment of a genuine oil field.
Dr Selim S. Shaker
Read the Original
This page is a summary of: Formation Damage Circumvent in HP-HT due to Pore Pressure Regression, January 2018, Society of Petroleum Engineers (SPE),
DOI: 10.2118/189558-ms.
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