It is all about pressure: drilling a high-pressure well in record time using

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This paper was prepared for presentation at the SPE Latin American & Caribbean Petroleum Engineering Conference held in Lima, Peru, 1–3 December 2010.
This paper was selected for presentation by anSPE program committee following review of information contained in an abstract submitted by the author(s). Contents of the paper have not been reviewed
by the Society of Petroleum Engineers and aresubject to correction by the author(s). The material does not necessarily reflect any position of the Society of Petroleum Engineers, its officers, or
members. Electronic reproduction, distribution,or storage of any part of this paper without the written consent of the Society of Petroleum Engineers is prohibited. Permission to reproduce in print is
restricted to an abstract of not more than 300words; illustrations may not be copied. The abstract must contain conspicuous acknowledgment of SPE copyright.

The Lisama field located in the middle Magdalena basin is well known as oneof the high pressure areas drilled in Colombia by
ECOPETROL (NOC). Densities up to 21.0 ppg are often reached and side tracks due to hole instability are common in the area,
sometimes as many asthree (3) per well, making plans in days and costs difficult to control.
The use of real time tools such as Pressure While Drilling (PWD) on the Lisama No 167 well demonstrated that only
monitoringthe fluid density at surface is not enough to keep the hole open and stable. Monitoring with PWD demonstrates that
real annulus pressure involves all kind of parameters affecting the mud densityincluding temperature, solids content and
compressibility, so that the real pressure and the Equivalent Mud Weight (EMW) can be determined at any point of the wellbore.
In this directional well, thechallenge for the service company is to use an MWD system that works with high-density fluid
conditions. Conventional systems have an operational limit of 18.0 ppg, so an electromagnetic telemetry...
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