Closed-Loop Zonal Inflow Analysis Using Chemical Tracer Signatures
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional methods for assessing zonal contributions in oil and gas wells, such as production logging tools (PLTs), incur high operational costs, pose logistical challenges, and risk tool malfunction or getting stuck, especially in sour environments, and manual sampling with downhole tracers is cumbersome and hazardous.
Innovation Solution
A real-time zonal inflow analysis system with chemical tracer modules in each perforation zone interacting with produced fluids to generate unique zonal signatures, combined with a surface chemical analysis panel for immediate concentration measurement and a monitoring dashboard for real-time decision-making.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If production logging tools (PLTs) are used to assess zonal contributions, then measurement precision is improved, but device complexity and operational cost increase significantly
Solution Approach 1:
The wellbore is divided into multiple perforation zones, each equipped with its own tracer module. This segmentation allows independent tracking of fluid contributions from each zone, achieving precise zonal measurement without requiring complex centralized logging tools.
Solution Approach 2:
The patent replaces complex mechanical production logging tools with a chemical-tracer-based measurement system. Tracer modules inject chemical signatures into specific zones, and surface detection instruments measure these signatures to determine zonal contributions, eliminating the need for heavy downhole mechanical equipment.
2Measurement precision
If production logging tools (PLTs) are deployed in sour environments, then measurement capability is maintained, but reliability decreases due to H2S exposure risks
Solution Approach 1:
The patent replaces vulnerable mechanical downhole tools with chemical tracer modules that are either surface-deployed or easily replaceable. The tracer chemistry remains stable in sour environments, and surface-based detection equipment avoids exposure to H2S, maintaining measurement capability while improving reliability.
Solution Approach 2:
The tracer modules are designed as disposable or easily replaceable components. If a tracer module encounters sour environment damage, it can be replaced without recovering or repairing complex equipment, ensuring continuous reliable operation in challenging conditions.
3Measurement precision
If manual sampling with downhole tracers is performed, then zonal identification is achieved, but productivity decreases due to cumbersome procedures
Solution Approach 1:
The patent implements continuous tracer injection and continuous surface monitoring, replacing discrete manual sampling events. This allows real-time tracking of zonal contributions as production occurs, eliminating downtime associated with manual sampling procedures and significantly improving productivity.
Solution Approach 2:
The system uses the produced fluid itself as the transport medium for the tracers. The tracers are injected downhole and naturally carried to the surface with the production stream, eliminating the need for separate sampling operations or additional fluid handling equipment.
4Measurement precision
If manual sampling procedures are used in sour wells, then zonal analysis is possible, but safety deteriorates due to H2S release risks
Solution Approach 1:
The patent introduces chemical tracers as intermediary substances that can be detected at the surface without requiring direct handling of produced fluids from sour zones. The tracer signature detection occurs in controlled surface laboratories, completely isolating operators from H2S exposure while maintaining measurement precision.
Solution Approach 2:
The patent replaces manual sampling operations with automated surface-based detection systems. Produced fluids are routed through closed-loop piping to surface laboratories where tracer analysis occurs in controlled environments, eliminating the need for workers to manually handle or sample fluids from sour well zones.
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 real-time, safe, and efficient zonal contribution quantification, optimizing production operations by reducing manual sampling risks, enhancing operational efficiency, and improving safety in diverse well conditions.
Implementation Method 1
the chemical tracer module interacts with produced fluid of the well to produce a zonal signature of a corresponding perforation zone, the zonal signature comprising a chemical reaction product of the chemical tracer module and the produced fluid
Data Source
AI summary
A real-time zonal inflow analysis system including a chemical analysis panel and a chemical tracer module disposed in each of a plurality of perforation zones in a well. The chemical tracer module produces a zonal signature of a corresponding perforation zone, where the zonal signature uniquely identifies the corresponding perforation zone. The chemical analysis panel includes an automated instrument and an integrated monitoring dashboard. The automated instrument obtains a production flow that includes a plurality of zonal contributions of the produced fluid from the plurality of perforation zones. The automated instrument measures, in the production flow, a concentration of the zonal signature of each perforation zone and determines, based on each concentration, a respective measure of each zonal contribution. The integrated monitoring dashboard displays the respective measure of each of zonal contribution to facilitate a production operation of the well.