Mechanism Research of Supercharging Effect Response in Formation
Pressure Testing While Drilling

doi:10. 3863/j. issn. 1674 – 5086. 2013. 03. 016

Abstract

Abstract:

While-drilling formation pressure testing can provide real time information of formation pressure，which can improve
the drilling efficiency and optimize drilling technology. When while-drilling formation pressure testing is conducted，mud
cake is formed against the borehole wall because of the mud loss，which is the reason for the supercharging effect around the
wellbore and has a great influence on formation pressure data. This paper has analyzed the primary reason and mechanism of
supercharging effect，and built a theoretical model of supercharging effect in mud cake condition on the basis of supercharging
mechanism. Supercharging effect response rules were simulated under different formation，formation fluent，mud cake and
wellbore conditions，which revealed the response mechanism of supercharging effect in while-drilling formation pressure. Our
research shows the main factors which have a significant influence on supercharging effect are formation permeability，mud
cake permeability and overbalance pressure. Supercharging effect will obviously increase in low formation permeability，high
mud cake permeability conditions.

Key words: measurement while drilling, formation pressure, supercharging effect, response mechanism；drilling

Yang Zaisheng1，2, Chen Ping1, Yang Chuan1, Ma Tianshou1. Mechanism Research of Supercharging Effect Response in Formation
Pressure Testing While Drilling[J]. 西南石油大学学报(自然科学版), DOI: 10. 3863/j. issn. 1674 – 5086. 2013. 03. 016.

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