Drilling

New Geosteering Work Flow Integrates Real-Time Measurements With Geomodels

This work presents a systematic geosteering work flow that automatically integrates a priori information and real-time measurements to update geomodels with uncertainties and uses the latest model predictions in a decision-support system (DSS).

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Fig. 1—Proposed geosteering work flow. The top part contains inputs to the work flow. The left part of the figure depicts the update loop. The part of the figure to the right contains the decision system that is based on the updated Earth model. The “drill ahead” decision results in new measurements that trigger another update and complete the full loop of the work flow.

To place a well in the best possible reservoir zone, operators use geosteering to support real-time well-trajectory adjustments. Geosteering refers to the process of making directional well adjustments on the basis of real-time information acquired while drilling. This work presents a systematic geosteering work flow that automatically integrates a priori information and real-time measurements to update geomodels with uncertainties and uses the latest model predictions in a decision-support system (DSS). The DSS supports geosteering decisions by evaluating production potential against drilling and completion risks.

Introduction

This paper presents a consistent, systematic, and transparent work flow for geosteering. The starting point is a priori information, for example a probabilistic geomodel representing a geological interpretation based on surface seismic and logs from offset wells, including relevant interpretation uncertainties.

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