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Resistivity

Resistivity

When a voltage is applied to a conductor, an electrical field is generated, and charges in the conductor feel the force due to the electrical field. The current density that results depends on the electrical field and the properties of the material. In some materials, including metals at a given temperature, the current density is approximately proportional to the electrical field. In these cases, the current density can be modeled as:

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A New Logging-While-Drilling Method for Resistivity Measurement in Oil-Based Mud.

Yongkang Wu¹, Baoping Lu², Wei Zhang^2,3

¹State Key Laboratory of Industrial Control Technology, College of Control Science and Engineering, Zhejiang University, Hangzhou 310027, China.

Sensors (Basel, Switzerland)

|February 22, 2020

Summary

A new oil-based logging-while-drilling (LWD) method uses capacitively coupled contactless conductivity detection (C4D) to overcome oil-based mud challenges. This innovative approach enables accurate reservoir estimation in challenging wellbore environments.

Keywords:

capacitively coupled contactless conductivity detection (C4D) technique inductive coupling principle logging-while-drilling (LWD)oil-based mud (OBM)resistivity logging

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Area of Science:

Geophysics
Petroleum Engineering
Electrical Engineering

Background:

Resistivity logging is crucial for reservoir identification and estimation.
Oil-based mud (OBM) improves drilling but impedes traditional low-frequency logging-while-drilling (LWD) methods due to its non-conductive nature.
Existing LWD methods struggle with the electrical insulation properties of OBM.

Purpose of the Study:

To propose a novel oil-based LWD method overcoming OBM limitations.
To develop a practical logging instrument based on the new method.
To validate the effectiveness and accuracy of the proposed technique.

Main Methods:

Combined capacitively coupled contactless conductivity detection (C4D) with the inductive coupling principle.
Developed a specialized logging instrument for oil-based mud environments.
Conducted numerical simulations and practical experiments (resistance box and well logging).

Main Results:

The proposed C4D-based LWD method effectively overcomes OBM's electrical insulation.
Numerical simulations demonstrated good measurement accuracy, deep detection depth, and high vertical resolution.
Practical experiments confirmed the instrument's resistance measurement accuracy and ability to identify wellbore features.

Conclusions:

The developed oil-based LWD method is feasible and effective for reservoir characterization.
The new technique provides accurate resistivity measurements in OBM environments.
This advancement enhances LWD capabilities in wells drilled with oil-based mud.