Modular Geosteering Tool With Tilted Antennas
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Solution Overview
Problem
Conventional resistivity tools lack azimuthal sensitivity, making it difficult to detect and avoid approaching bed boundaries during horizontal drilling, and are not easily customizable as new measurement techniques are developed.
Innovation Solution
A modular geosteering tool assembly with extension modules that provide azimuthal sensitivity by tilting antennas, allowing for custom configuration and deeper measurement capabilities without lengthening the tool string, enabling detection of bed boundaries and geosteering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional resistivity tools are used, then the tool structure is simple and manufacturing is easy, but the tools lack azimuthal sensitivity and cannot detect bed boundaries
Solution Approach 1:
The resistivity tool is divided into multiple independent modules, each with specific antenna configurations. Base modules provide standard resistivity measurement while extension modules add azimuthal sensitivity through tilted antennas. This segmentation allows the system to achieve enhanced measurement precision without requiring complete redesign of the entire tool.
Solution Approach 2:
The modular architecture enables a single tool platform to perform multiple functions. The base module can operate independently for standard resistivity logging, while extension modules can be added to provide azimuthal sensitivity for bed boundary detection. This multi-functionality resolves the contradiction by allowing the tool to adapt its capabilities to different measurement needs without increasing base complexity.
2Adaptability or versatility
If conventional single-unit resistivity tools are manufactured, then manufacturing processes are standardized and costs are controlled, but the tools cannot be customized for new measurement techniques
Solution Approach 1:
The tool is segmented into standardized base modules and extension modules with defined interfaces. This segmentation enables independent manufacturing of each module type using standardized processes, while allowing unlimited customization through different combinations of modules. The standardized interfaces maintain ease of manufacture while the modular configuration provides adaptability.
Solution Approach 2:
The modular design transforms the tool from a static, fixed-configuration instrument to a dynamic, reconfigurable system. Modules can be added or removed based on specific measurement requirements, allowing the tool to adapt to new measurement techniques while maintaining standardized manufacturing processes for each module type.
3Measurement precision
If the tool string is lengthened to achieve deeper measurement capabilities, then measurement depth increases, but drilling efficiency decreases and operational complexity increases
Solution Approach 1:
Instead of increasing measurement depth by lengthening the tool string in the axial dimension, the invention achieves deeper effective measurement capability through the radial dimension. Tilted antennas in extension modules are positioned to radiate electromagnetic energy at angles, enabling detection of bed boundaries at greater radial distances from the tool without increasing the axial length of the tool string, thus maintaining drilling efficiency.
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 accurate detection and avoidance of bed boundaries, improving drilling efficiency by maintaining the well bore within the pay zone and allowing for custom tool configurations to adapt to new techniques, reducing manufacturing and maintenance costs.
Implementation Method 1
One such tool is the resistivity tool, which includes one or more antennas for transmitting an electromagnetic signal into the formation and one or more antennas for receiving a formation response
Data Source
AI summary
A retrievable tool for steering through an earth formation includes a first tool assembly and a tilted antenna attached to the first tool assembly. The tool also includes a second tool assembly attached to the first tool assembly and a tilted antenna attached to the second tool assembly. The first tool assembly attaches to the second tool assembly so that the antennas are tilted in predetermined directions. The tilted antennas are transmitter antennas or receiver antennas. Each tool assembly is a tubular cylinder with a longitudinal axis running the length of the cylinder, wherein the tubular cylinder has two ends, each end including a rotational attachment mechanism. The tool assemblies attach to each other through their rotational attachment mechanisms. The rotational attachment mechanism may be a screw-on mechanism, press-fit mechanism, or welded mechanism.