Taggant-Based Rock Cuttings Depth Detection During Drilling
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Solution Overview
Problem
Inaccurate determination of rock cutting depth during drilling operations, particularly in deviated and horizontal wells, leads to uncertainties of several centimeters or meters, affecting the efficacy of mud logging and well placement.
Innovation Solution
A method and system utilizing taggants, such as polymeric nanoparticles with encoded identification codes, are injected into drilling fluid to impregnate rock cuttings, detected at the surface, and analyzed to generate injection profiles, adjusting pump parameters for precise depth determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional methods are used for rock cutting depth determination, then the system is simple, but the measurement precision is poor with uncertainties of several centimeters or meters
Solution Approach 1:
The patent introduces taggants as intermediary markers that are injected into the drilling fluid and attach to rock cuttings. These taggants serve as mediators between the drilling process and the detection system, enabling precise depth determination through optical or other detectable signals without requiring complex direct measurement equipment at the drill bit
Solution Approach 2:
The patent replaces complex mechanical depth measurement systems with an optical/detection-based system using taggants. Instead of using mechanical sensors or complex positioning systems downhole, the invention uses detectable taggant markers that can be identified at the surface, substituting mechanical complexity with optical or electromagnetic detection
2Measurement precision
If taggant injection is used to improve depth determination, then the measurement precision improves, but the device complexity increases due to pump control requirements
Solution Approach 1:
The patent implements a feedback control system where the detection of taggant signals provides information about cutting depth and taggant distribution. This feedback is used to automatically adjust pump injection parameters, creating a closed-loop system that improves precision while managing complexity through automated control rather than manual operation
Solution Approach 2:
The system uses the natural circulation of drilling fluid to transport taggants and cuttings through the wellbore, eliminating the need for complex pumping systems downhole. The existing mud circulation system serves the dual purpose of cooling the bit and transporting both taggants and rock cuttings, reducing additional device complexity
3Measurement precision
If multiple batches of taggant are injected to improve depth resolution, then the measurement precision improves, but the loss of time increases due to multiple injection cycles
Solution Approach 1:
The patent employs periodic injection of taggant batches at regular intervals during drilling operations. This periodic action creates distinct temporal signatures for different depth zones, enabling high-resolution depth determination through time-based separation of taggant signals without requiring continuous or frequent injections that would waste time
Solution Approach 2:
The system performs preliminary injection of taggant batches before reaching critical depth zones or formation boundaries. By proactively tagging cuttings in advance, the system ensures that depth information is captured before the drilling condition changes, eliminating the need for repeated injection cycles to achieve the same depth resolution
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
Accurately determines the depth of rock cuttings with an uncertainty of 0.3 meters, improving petrophysical analysis and well placement by enhancing the quality of mud logging.
Implementation Method 1
the first batch of taggant are transported downhole by the drilling fluid to impregnate a first batch of rock cuttings
Implementation Method 2
detecting, using a taggant detector at a surface location, a first time-dependent signal from the first batch of taggant
Implementation Method 3
the first batch of taggant are transported up-hole by the drilling fluid subsequent to impregnating the first batch of rock cuttings
Data Source
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AI summary
A method for depth determination of drilled rock cuttings is disclosed. The taggant is injected and transported downhole along the mud stream (204, 205) and attaches to the rock cuttings. Taggant impregnated cuttings are detected at the surface (108) based on molecular weight, emission wavelengths or radio frequency characteristics for encoding the taggant. The identification code identifies the depth of the drill bit when the particular batch of the taggant is released into the mud. The detection data, in addition to mud properties, flow rates, drill volume and penetration rates, formation characteristics, and well specifications are transferred to and analyzed by a taggant analysis and control engine (202). The taggant analysis and control engine (202) controls an IoT controller (203) that adapts the parameters of the taggant injection pump (206) to achieve an intelligent controlled release to optimize the depth characterization process.