Abstract

DAPEX (Detection of Abnormal Pressure while Drilling EXpert system) is an expert system which monitors and analyses drilling parameters in real-time during drilling. Its purpose is to perform a comprehensive pressure analysis based on data available from several sources, including surface measurements, downhole measurements (M WD) and predicted geological data. The system identifies abnormal pressure conditions as well as diagnoses their origins.

1. Introduction

High pressure exploration drilling is a knowledge-intensive operation which imposes strong requirements on the quality of the information gathered before and while drilling. DAPEX (Detection of Abnormal Pressure while Drilling EXpert system) is an expert system which monitors and analyses drilling parameters in real-time during drilling. Its purpose is to perform a comprehensive pressure analysis based on data available from several sources, including surface measurements, downhole measurements (MWD) and predicted geological data. The system identifies abnormal pressure conditions as well as diagnoses their origins. DAPEX is an interactive analysis tool for the field geologists on the drilling rig, and is intended to be used primarily on high pressure exploration wells. The system was put into its first field test on a North Sea high pressure well in January 1992.

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