Eccentering Correction for Gamma Ray Logging Tools
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Solution Overview
Problem
Existing techniques for monitoring the conditions of a subterranean well's annular space using gravel pack imaging tools are hindered by motion distortions, which affect the accuracy of signal detection, leading to inefficiencies in identifying defects such as voids and non-uniform material distribution, thereby increasing maintenance costs and fluid production issues.
Innovation Solution
A system and method that utilize a logging tool with detectors to generate an eccentering corrected response by correcting radial shift distortions in gamma ray photon counts, employing a computer processor and data transmission device to process tool responses and eliminate eccentering distortions, allowing for effective detection of defects in the annular space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Difficulty of detecting and measuring
If a logging tool is used to detect defects in the annular space, then defect detection capability is improved, but motion distortions cause radial shift in tool response reducing measurement precision
Solution Approach 1:
The system applies eccentering correction by using feedback from the detected radial shift in tool response. The computer processor calculates the magnitude and direction of the radial shift based on the gamma ray photon counts from multiple detectors, then adjusts the tool response data to compensate for this shift, improving measurement precision while maintaining defect detection capability
Solution Approach 2:
The system changes the parameters of the tool response by applying eccentering correction factors to the gamma ray photon counts. This involves transforming the raw detector signals into corrected measurements that account for the radial shift, thereby resolving the contradiction between maintaining detection sensitivity and achieving measurement accuracy
2Reliability
If gravel pack imaging is performed to monitor annular space conditions, then defect detection is improved, but motion distortions increase device complexity
Solution Approach 1:
The computer processor performs multiple functions: it detects radial shift, calculates correction factors, applies eccentering correction, and identifies defects. By consolidating these functions into a single processing unit, the system improves monitoring reliability without proportionally increasing device complexity
Solution Approach 2:
The eccentering correction technique acts as an intermediary processing step between raw data acquisition and defect identification. This intermediate correction layer simplifies the overall system by providing a standardized method to handle motion distortions, reducing the complexity of subsequent defect analysis
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 eccentering correction technique enhances the accuracy of defect detection in the annular space, reducing noise and distortion, thereby improving the reliability of monitoring and maintenance operations, and minimizing the introduction of particulate materials into extracted fluids.
Implementation Method 1
The tool response includes scattered gamma ray photon counts distorted by a radial shift of the logging tool
Data Source
AI summary
A system for generating eccentering corrected response includes a logging tool configured to examine a material filled in an annular space to generate a tool response. The material is filled in an annular space formed by an outer conduit and an inner conduit disposed in the outer conduit. The logging tool is disposed in an inner conduit. The tool response includes scattered gamma ray photon counts distorted by a radial shift of the logging tool. The system includes a data transmission device coupled to a plurality of detectors and configured to transmit data detected by the plurality of detectors. The system also includes a computer processor linked to the data transmission device and configured to receive the tool response. The computer processor is configured to process the tool response and generate an eccentered corrected response by correcting effects of the radial shift in the tool response using eccentering correction technique.