Wellbore Scale Identification Using Pulsed Neutron Logging
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Solution Overview
Problem
Current methods for identifying scale in wellbore tubing are inefficient, requiring sample analysis which can be difficult due to crystalline nature and location issues, leading to indiscriminate treatment and increased downtime and costs.
Innovation Solution
A system comprising a first logging tool for measuring elemental makeup using pulsed neutron logging and a second tool for measuring deviations in the inner diameter, allowing for real-time identification of scale type and location without sampling, using tools like the RMT Elite™ Reservoir Monitor Tool and Multi-Sensor Caliper Tool.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If scale samples are taken and analyzed, then scale type identification is possible, but sample analysis is difficult due to crystalline nature and location issues, and gaps in analysis occur
Solution Approach 1:
The patent replaces the mechanical sampling and physical analysis system with a chemical detection system. The scale detection device uses chemical reactions between scale samples and reagents to produce detectable signals (color changes, fluorescence, etc.), eliminating the need for manual sampling and physical examination of crystalline scale deposits.
Solution Approach 2:
The patent introduces chemical reagents as intermediaries between the scale samples and the detection system. These reagents react with specific scale components to produce measurable signals, serving as a mediator that translates the presence and type of scale into detectable form without requiring direct physical analysis of the scale crystals themselves.
2Measurement precision
If scale samples are taken for analysis, then scale type can be identified, but treatment fluids are applied indiscriminately, increasing downtime and costs
Solution Approach 1:
The patent implements a feedback system where the detection device provides real-time information about scale type and location, which immediately guides the selection and application of appropriate treatment fluids. This closed-loop feedback eliminates the trial-and-error approach and reduces well downtime by ensuring the correct treatment is applied from the first attempt.
Solution Approach 2:
The patent performs preliminary detection and identification of scale type before applying treatment fluids. The scale detection device is deployed to identify scale characteristics in advance, allowing treatment strategies to be predetermined and prepared, thus avoiding unnecessary trial treatments and reducing overall well downtime.
3Measurement precision
If scale samples are analyzed, then scale type is identified, but the process is wasteful requiring multiple trial treatments
Solution Approach 1:
The patent performs preliminary identification of scale type using the detection device before applying any treatment fluids. This advance knowledge allows for precise selection of treatment fluids matched to the specific scale type, preventing wasteful application of ineffective treatments and reducing overall treatment fluid consumption.
4Measurement precision
If sampling is performed at every section of tubing, then complete analysis is achieved, but isolation of samples at every section is not possible, creating gaps in analysis
Solution Approach 1:
The patent replaces the mechanical sampling operation with a chemical detection system that can be deployed through the tubing without requiring sample isolation or extraction at each section. The detection device circulates reagents through the tubing and detects scale presence and type in situ, making the operation feasible and eliminating gaps in 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
Enables targeted scale treatment, reducing downtime and costs by accurately identifying scale type and location, thereby optimizing well operations.
Implementation Method 1
a first logging tool for measuring scale elemental makeup; providing first logging tool (10) comprising tool body (15), neutron source (50) coupled to tool body (15), and detectors (55) coupled to tool body (15). First logging tool (10) may comprise a pulsed neutron logging tool.
Data Source
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AI summary
Scale identifier systems and methods for generating a log of scale type and location in subterranean formations, and, more particularly, in wellbore tubing are provided. A method for scale identification may be provided. The method may comprise providing a first logging tool comprising a tool body, a neutron source coupled to the tool body, and detectors coupled to the tool body; providing a second logging tool for measuring deviations in inner diameter of a tubing in a wellbore; placing the first logging tool and the second logging tool into the wellbore; logging the interior of the tubing with the first logging tool and the second logging tool to generate data; and generating a log of scale location and type from the data.