Overview of High-Resolution Array Induction Logging Tool (HDIL)
The High Definition Induction Logging Tool (HDIL) is an advanced logging instrument. Based on the principle of electromagnetic induction, it features a multi-frequency and multi-coil array design, enabling it to provide high-precision formation resistivity measurement data. It plays a crucial role in oilfield exploration and development, and is widely applied in fields such as formation evaluation, reservoir identification, and fluid property analysis.
Technical Principles
The HDIL generates an alternating magnetic field through its transmitting coil, inducing induced currents in the conductive media within the formation. The receiving coil measures the secondary magnetic field generated by these induced currents, thereby calculating the formation's conductivity and resistivity. Equipped with multiple frequencies (e.g., 10 kHz to 150 kHz) and multiple receiving coils, the instrument can generate resistivity curves with varying detection depths and vertical resolutions.
Instrument Features
High resolution: It provides resistivity curves with three vertical resolutions (1 ft, 2 ft, 4 ft) and six radial detection depths (10 inches to 120 inches).
Multi-frequency operation: Simultaneous measurements using multiple frequencies enhance measurement stability and accuracy.
Strong data processing capability: Through specialized software processing, it can generate radial imaging maps of formation resistivity, intuitively reflecting formation characteristics.
Logging Environment Requirements
Mud performance: Mud resistivity must exceed 0.02 Ω·m to ensure an adequate signal-to-noise ratio for measurements.
Borehole conditions: Borehole size and deviation angle affect measurement accuracy and must remain stable within a certain range.
Instrument stability: During logging, the instrument's coils must be kept parallel to the borehole wall to avoid swinging.
Application Scenarios
Reservoir identification: High-resolution curves effectively identify thin reservoirs, improving the precision of reservoir division.
Fluid property analysis: Qualitative identification of oil-water layers can be achieved by comparing flushed zone resistivity with true formation resistivity.
Permeability evaluation: Analysis of resistivity variations across different radial detection depths enables qualitative evaluation of formation permeability.
Advantages and Limitations
Advantages: High precision and resolution make it suitable for exploring complex formations and thin layers.
Limitations: It has strict requirements for logging environments, and both the instrument cost and maintenance expenses are relatively high.
Future Development Directions
With technological advancements, the HDIL will evolve toward higher resolution, stronger anti-interference capability, and more intelligent data processing, further enhancing its application value in oil and gas exploration.
Summary
The High-Resolution Array Induction Logging Tool is an indispensable instrument in modern oil and gas exploration. Its high precision and multi-parameter measurement capabilities provide a critical basis for reservoir evaluation and fluid identification. However, its application is constrained by logging environment conditions and costs. In the future, with continuous technological innovation, this instrument is expected to play a more significant role across a broader range of geological conditions. For the latest technological progress or product inquiries, please contact sales@celestep.com.
