Real-Time Pore Pressure Detection: Indicators and Improved Methods

High uncertainties may exist in the predrill pore pressure prediction in new prospects and deepwater subsalt wells; therefore, real-time pore pressure detection is highly needed to reduce drilling risks. The methods for pore pressure detection (the resistivity, sonic, and corrected d-exponent method...

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Bibliographic Details
Published in:Geofluids 2017-01, Vol.2017 (2017), p.1-12
Main Authors: Zhang, Jincai, Yin, Shangxian
Format: Article
Language:English
Subjects:
Bending stresses
Calibration
Clay
Data logging
Decision analysis
Deep water
Deepwater drilling
Detection
Drilling
Drilling muds
Indicators
Instability
Logging
Mathematical models
Methods
Minerals
Monitoring
Mud
Plastics stretching
Pore pressure
Pressure
Real time
Stability
Stability analysis
Trends
Velocity
Well logs
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Summary:High uncertainties may exist in the predrill pore pressure prediction in new prospects and deepwater subsalt wells; therefore, real-time pore pressure detection is highly needed to reduce drilling risks. The methods for pore pressure detection (the resistivity, sonic, and corrected d-exponent methods) are improved using the depth-dependent normal compaction equations to adapt to the requirements of the real-time monitoring. A new method is proposed to calculate pore pressure from the connection gas or elevated background gas, which can be used for real-time pore pressure detection. The pore pressure detection using the logging-while-drilling, measurement-while-drilling, and mud logging data is also implemented and evaluated. Abnormal pore pressure indicators from the well logs, mud logs, and wellbore instability events are identified and analyzed to interpret abnormal pore pressures for guiding real-time drilling decisions. The principles for identifying abnormal pressure indicators are proposed to improve real-time pore pressure monitoring.
ISSN:1468-8115
1468-8123
DOI:10.1155/2017/3179617