Real-Time Borehole Positioning via Gamma Log Marker Matching
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Solution Overview
Problem
Current drilling technologies face challenges in accurately navigating boreholes due to increased complexity and depth, leading to costly errors and potential long-term reduction in well output, as they fail to adequately address positional uncertainties and geological complexities during directional drilling.
Innovation Solution
A system and method that utilizes baseline and planned markers, created from formation information, to identify and adjust drilling plans in real-time by comparing gamma logs and other data, allowing for precise alignment with intended targets and correcting deviations during the drilling process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If current drilling technologies are used to navigate boreholes, then drilling operations can be performed, but positional accuracy deteriorates due to increased depth and geological complexity
Solution Approach 1:
The system segments the drilling monitoring process into distinct functional modules: gamma ray detection, formation evaluation, marker identification, and real-time drilling plan adjustment. Each module performs a specific function, allowing the complex drilling operation to be managed through coordinated simpler subsystems, thereby improving positional accuracy without overwhelming system complexity
Solution Approach 2:
The system implements continuous feedback by comparing actual borehole position (determined through gamma log analysis) with the planned drilling trajectory. Real-time feedback enables dynamic adjustments to the drilling plan, correcting deviations before they accumulate, thus maintaining high positional accuracy throughout the drilling operation
2Manufacturing precision
If real-time marker identification is implemented, then drilling accuracy is improved, but system complexity increases
Solution Approach 1:
The system creates a virtual model (copy) of the subsurface formation by analyzing gamma ray logs and comparing them against known formation characteristics and marker patterns. This digital replica allows for real-time identification of geological markers and comparison with planned drilling targets, achieving high drilling precision through information processing rather than physical complexity
Solution Approach 2:
The system replaces complex mechanical positioning and measurement systems with gamma ray spectroscopy and computational analysis. Instead of relying on purely mechanical sensors and actuators, the invention uses nuclear physics-based gamma detection combined with real-time data processing to achieve precise borehole positioning and marker identification
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
This approach enhances drilling accuracy by enabling real-time adjustments, minimizing errors and ensuring the borehole aligns correctly with planned targets, thereby reducing operational costs and maintaining well productivity.
Implementation Method 1
A gamma log detector used to obtain a gamma log while drilling the borehole
Data Source
Figure 1A~11
Figure 1B
Figure 1C~2
AI summary
Provided are a system and method for identifying planned markers while drilling a borehole. In one example, the method includes obtaining a plan containing planned markers that each corresponds to a baseline marker from an existing well. Each of the baseline markers corresponds to a waveform from a log file obtained from the existing well and is associated with a waveform representation of the corresponding waveform. Each of the planned markers is associated with an estimated true vertical depth (TVD) value. A second log file corresponding to the borehole is obtained that contains waveforms representing formation information detected within the borehole. The second log file is scanned for a planned marker based on the estimated TVD value and the waveform representation of the baseline marker corresponding to the planned marker. At least one match may be identified and reported for the planned marker.