Multifunctional Magnetic Tags for Accurate Cutting Depth Logging
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Solution Overview
Problem
Existing methods for determining the origin depth of subterranean cuttings during drilling operations are inaccurate, especially in wells with long horizontal sections, leading to significant depth uncertainties and errors in formation characterization.
Innovation Solution
The use of magnetic nanoparticle tags comprising a superparamagnetic iron oxide core, a fluorescent dye intermediate layer, and a polymer shell, which are mixed with drilling mud to tag cuttings, allowing for precise determination of origin location through magnetic separation and fluorescent analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If mud tracers are used to determine mud cycle time, then circulation time can be measured, but depth uncertainty increases significantly when return trip time is lengthy
Solution Approach 1:
The patent introduces magnetic tags as intermediary markers that attach to cuttings at the drill bit. These tags serve as mediators between the drilling operation and the detection system, allowing direct tracking of cutting origin depth without relying on indirect circulation time measurements. The magnetic tags enable precise depth determination by providing a direct physical marker on the cutting itself.
Solution Approach 2:
The patent replaces the mechanical/time-based mud tracer system with a magnetic detection system. Instead of measuring circulation time through fluid flow mechanics, the system uses magnetic field interaction to detect and identify tagged cuttings, eliminating the time delay and uncertainty associated with lengthy return trips.
2Measurement precision
If circulation time is used to estimate cutting depth, then a measurement method is available, but measurement precision deteriorates in wells with long horizontal sections
Solution Approach 1:
Magnetic tags serve as intermediaries that directly mark cuttings at their point of origin. This eliminates the need to calculate depth based on complex wellbore geometry and circulation patterns, providing accurate depth information regardless of well configuration complexity.
Solution Approach 2:
The system changes the measurement parameter from indirect circulation time to direct magnetic tag detection. This parameter change allows accurate depth determination independent of wellbore geometry, as the magnetic tags provide direct identification of cutting origin depth rather than requiring calculation based on complex flow paths.
3Measurement precision
If magnetic tags with fluorescent dye are used, then cutting origin depth can be accurately determined, but manufacturing complexity increases
Solution Approach 1:
The magnetic tag structure employs nesting by placing fluorescent dye molecules inside or on the surface of magnetic nanoparticle cores. This nested structure allows the fluorescent functionality to be integrated within the magnetic particle framework, enabling accurate detection while maintaining a compact, manufacturable design.
Solution Approach 2:
The patent uses composite materials by combining magnetic nanoparticles with fluorescent dye molecules to create multifunctional tags. This composite approach integrates magnetic properties for separation/detection with fluorescent properties for identification, achieving high measurement precision while the composite nature simplifies manufacturing through established nanoparticle synthesis methods.
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 and efficient assignment of origin depth to cuttings by utilizing unique fluorescence and mass spectrometry signals, reducing depth uncertainties and enhancing formation characterization accuracy.
Implementation Method 1
a nanoparticle tag includes a superparamagnetic iron oxide core
Implementation Method 2
an intermediate layer comprising a fluorescent dye
Data Source
AI summary
Compositions and methods for determining the origin location of a subterranean sample are provided. Compositions include a nanoparticle tag including a superparamagnetic iron oxide core, an intermediate layer including a fluorescent dye, and a polymer shell. The nanoparticles can be synthesized by functionalizing a superparamagnetic iron oxide nanoparticle core and covalently bonding a fluorescent dye to the functionalized nanoparticle core. In some implementations, a polymer is covalently bonded to the functionalized, fluorescent superparamagnetic iron oxide nanoparticle core. The nanoparticle tag can be used to determine the origin location of a subterranean sample by mixing the nanoparticle tag into a fluid, flowing the fluid into a subterranean formation, recovering subterranean samples from the subterranean formation, and separating tagged samples from untagged samples using a magnet. The origin location of the subterranean sample can be determined by analyzing the fluorescent signal of the nanoparticle tag.