Rotating Electromagnetic Logging Tool for Anisotropic Formation Steering
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Solution Overview
Problem
Current electromagnetic logging tools fail to accurately measure formation resistivity in anisotropic formations and determine dip and strike angles, leading to inaccurate drilling direction adjustments and reduced exposure to hydrocarbon-bearing formations.
Innovation Solution
A rotating electromagnetic tool with tilt antenna systems and a processing scheme that calculates relative azimuthal angle sensitivity, allowing for the determination of tool orientation and steering towards underground targets by matching raw measurements to modeled responses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional electromagnetic logging tools are used to measure formation resistivity, then the measurement process is simple, but the measurement precision is poor in anisotropic formations
Solution Approach 1:
The tool divides the measurement system into multiple independent antenna elements (at least two antennas) that can be individually oriented and controlled. Each antenna measures resistivity in its specific orientation, allowing the system to decompose the complex anisotropic formation properties into separate horizontal and vertical resistivity components, thereby improving measurement precision without requiring a completely new tool design
Solution Approach 2:
The tool employs rotatable antenna elements that can dynamically change their orientation relative to the formation. The antennas rotate to different angular positions to measure resistivity in multiple directions (horizontal and vertical), enabling the tool to adapt its measurement geometry to the formation's anisotropic properties and achieve accurate measurements across varying formation conditions
2Manufacturing precision
If tools without dip and strike measurement capability are used, then the device complexity is low, but the drilling direction adjustment accuracy is reduced
Solution Approach 1:
The antenna system serves multiple functions: it measures formation resistivity, determines dip angle, and determines strike angle simultaneously. By making the antenna system multi-functional, the tool achieves accurate drilling direction adjustment capability without adding separate dedicated sensors for each function, thus improving precision while controlling overall device complexity
Solution Approach 2:
The tool uses real-time signal analysis from the antenna measurements to calculate dip and strike angles, providing feedback on the borehole's orientation relative to the formation. This feedback enables dynamic adjustment of drilling direction to maintain optimal exposure to hydrocarbon-bearing formations, improving manufacturing precision through iterative correction
3Productivity
If the borehole is drilled perpendicular to formation beds, then the drilling process is simple, but the exposure to hydrocarbon-bearing formations is reduced
Solution Approach 1:
The tool performs preliminary measurements of formation resistivity and orientation parameters (dip and strike angles) before finalizing the drilling path. By pre-characterizing the formation's anisotropic properties and bed orientation, the system can plan optimal drilling trajectories that maximize hydrocarbon exposure while managing operational complexity through systematic data collection and analysis
Solution Approach 2:
The system changes the drilling parameters (borehole orientation angles) based on measured formation properties. By adjusting the drilling direction to match the formation's dip and strike angles, the tool optimizes the borehole's exposure to hydrocarbon-bearing zones. This parameter adjustment transforms the drilling operation from a fixed perpendicular approach to an adaptive trajectory that responds to real-time formation characteristics
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables precise steering of the drilling tool to hydrocarbon-bearing formations by accurately determining formation resistivity and orientation parameters, improving drilling efficiency and exposure to target zones.
Implementation Method 1
a transmitter transmits an electromagnetic signal that passes through formation materials around the borehole and induces a signal in one or more receivers
Data Source
AI summary
A method of processing data from an electromagnetic resistivity logging tool which includes a transmitter coil and a receiver coil is disclosed. The electromagnetic resistivity logging tool is placed at a desired location. The transmitter coil and the receiver coil are positioned at a first azimuthal angle. A signal is transmitted from the receiver coil. The receiver coil then receives a signal. The signal at the receiver coil, a tilt angle of the transmitter coil, a tilt angle of the receiver coil and the first azimuthal angle are then used to calculate a first complex voltage representing at least one component of the received signal.