1887

Abstract

Summary

Formation pressure is one of the important subsurface properties for drilling and completion of wells. If assumed or predicted pressures are too low or too high than the actual either a kick can occur or the well could not be drilled to its target depth respectively. Current practice is to make an assessment of the formation pressures to be encountered using offset wells and other geological and seismic information. These estimates are then monitored against the while-drilling measurements. These measurements, however, are all behind the bit and they do not directly indicate what is ahead of the bit where it matters the most.

A new technique that integrates local seismic data and real-time logs providing while-drilling formation pressure estimates “ahead” of the bit has recently been published. We present a field test of this integrated approach conducted in offshore Nigeria. Results show a formation-pressure ramp over 600 m ahead of the bit is predicted and placed within 50 m of its actual location and formation pressure values are predicted within 0.05 to 0.1 g/cm3 of their post-drill prognosis.

Loading

Article metrics loading...

/content/papers/10.3997/2214-4609.201413297
2015-06-01
2019-12-06
Loading full text...

Full text loading...

References

  1. Eaton, B.A.
    [1975] The equation for geopressure prediction from well logs. Society of Petroleum Engineers, 5,544.
    [Google Scholar]
  2. Esmersoy, C., Kania, A., Kashikar, S., Ramirez, A., Hannan, A., Lu, L., Teebenny, S., and Duan, L.
    [2011] Optimum use of seismic data to reduce drilling risk and improve well placement. 73rd EAGE Conference & Exhibition, Extended Abstracts, C046.
    [Google Scholar]
  3. Sayers, C.M.
    [2010] Geophysics under stress: Geomechanical applications of seismic and borehole acoustic waves. SEGDistinguished Instructor Series, No. 13. ISBN 978-1-56080-210-5.
    [Google Scholar]
http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609.201413297
Loading
/content/papers/10.3997/2214-4609.201413297
Loading

Data & Media loading...

This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error