Degradable Polymer Tracers for Mud Logging Depth Accuracy
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Solution Overview
Problem
Traditional chemical tracers used in mud logging accumulate in drilling mud, leading to detection noise and depth uncertainty in wellbore cuttings, especially in horizontal sections, due to poor bonding and recycling issues, and human error in labeling.
Innovation Solution
Development of degradable polymeric additives with a tracer functional group bonded to a base polymeric component via a hydrolysable covalent bond, which degrades under downhole conditions, preventing accumulation in drilling mud and reducing detection noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional chemical tracers are used in mud logging, then tracer detection is enabled, but accumulation in drilling mud causes detection noise and depth uncertainty
Solution Approach 1:
The patent employs biodegradable polymer tracers that naturally degrade in the drilling mud environment, transforming from persistent accumulating substances into temporary markers. These tracers perform their tagging function and then break down into harmless byproducts, eliminating the accumulation problem while maintaining detection capability throughout the drilling operation
Solution Approach 2:
The invention changes the chemical stability parameter of the tracer from permanent to time-limited by incorporating biodegradable polymer structures. This parameter change allows the tracer to remain stable enough for detection during the drilling process but ultimately degrade to prevent accumulation, directly resolving the contradiction between detection utility and substance accumulation
2Reliability
If tracers are introduced in highly concentrated amounts for short periods, then tagging effectiveness is improved, but detection noise increases due to accumulation
Solution Approach 1:
By using biodegradable tracers with limited lifecycles, the system can safely employ high concentrations for effective tagging without long-term accumulation concerns. The tracers fulfill their tagging purpose reliably and then naturally eliminate themselves, preventing the harmful detection noise that would result from persistent accumulation
Solution Approach 2:
The patent converts the potential harm of tracer accumulation into a benefit by designing tracers that degrade into detectable byproducts or completely harmless substances. The degradation process itself becomes useful, allowing the system to achieve both effective tagging and automatic elimination of excess tracer material
3Measurement precision
If tracers are used to mark cuttings in horizontal sections, then depth correlation is attempted, but poor bonding and recycling issues cause depth uncertainty
Solution Approach 1:
The patent employs composite tracer structures combining biodegradable polymer matrices with cutting-specific binding agents. This composite approach enhances the bonding reliability between tracer and cutting particles while maintaining the overall biodegradability of the system, ensuring both accurate depth correlation and eventual degradation to prevent accumulation
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
The degradable polymeric additives effectively reduce depth uncertainty in mud logging by eliminating accumulation and noise, improving the accuracy of depth association and reducing human and machine errors in tracing wellbore cuttings.
Implementation Method 1
The base polymeric component is bonded to the tracer functional group by a hydrolysable covalent bond
Data Source
AI summary
Degradable polymer additives are provided. The degradable polymer additives include a tracer functional group that is bonded to a base polymeric component by a hydrolysable covalent bond. The base polymeric component is a polysaccharide. The tracer functional group is selected from the group comprising a halogen-containing functional group, a substituted heterocyclic aromatic group, and combination thereof. A method utilizing the degradable polymeric additives in an altered drilling fluid is provided. Such a method includes introducing the altered drilling fluid into a wellbore and recovering an associated wellbore cutting from a depleted drilling fluid.