Bi-directional Flow Temperature Sensing for Wellbore Accuracy
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Solution Overview
Problem
Existing methods for determining fluid flow characteristics in subterranean wells, particularly in multi-zone wells, are inadequate as they fail to accurately measure flow rates when fluids from multiple zones are comingled, leading to uncertainties in flow rate analysis due to reduced temperature differences.
Innovation Solution
A well system and method that utilizes bi-directional flow and distributed temperature sensing, where fluids are measured in one direction through an annulus and then in the opposite direction, allowing for the calculation of Joule-Thomson effects and accurate determination of flow rates by comparing temperature profiles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If single-direction flow measurement is performed using distributed temperature sensing, then the measurement process is simple, but the flow rate analysis accuracy is insufficient due to reduced temperature differences in multi-zone comingled fluids
Solution Approach 1:
The patent implements periodic action by performing distributed temperature sensing measurements in two opposite flow directions (upward and downward) through the wellbore. This bidirectional periodic measurement approach allows the system to capture temperature differences that occur when fluids from multiple zones mix, enabling accurate flow rate calculation by comparing the temperature profiles from both directions. The periodic reversal of flow direction creates the necessary temperature contrast that resolves the measurement accuracy problem.
2Measurement precision
If bi-directional flow measurement is implemented, then flow rate analysis accuracy is improved, but the measurement time and operational complexity increase
Solution Approach 1:
The patent applies continuity of useful action by conducting temperature measurements during both upward and downward flow phases without interrupting the overall measurement process. The system continuously captures temperature data throughout the bi-directional flow cycle, ensuring that no valuable measurement information is lost. This continuous measurement approach maximizes the utilization of the flow process itself as the measurement medium, reducing total measurement time while maintaining high accuracy.
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
This approach enhances the accuracy of fluid flow rate analysis in subterranean wells by accounting for temperature changes during both flow directions, overcoming the limitations of previous methods and providing more precise data without increasing costs.
Implementation Method 1
Distributed temperature sensing in subterranean wells has been performed in the past using optical fiber sensors
Implementation Method 2
allowing for the calculation of Joule-Thomson effects and accurate determination of flow rates
Data Source
AI summary
A method of determining characteristics of fluids flowed between a wellbore and multiple zones intersected by the wellbore can include measuring a first distributed temperature profile of the fluids along the wellbore while the fluids flow in one direction through the wellbore, and measuring a second distributed temperature profile of the fluids along the wellbore while the fluids flow in an opposite direction through the wellbore. Another method can include flowing the fluids in a first direction through an annulus formed between tubular strings in the wellbore, measuring a first distributed temperature profile of the fluids while flowing the fluids in the first direction, flowing the fluids in a second, opposite direction through the annulus, and measuring a second distributed temperature profile of the fluids along the wellbore while flowing the fluids flow in the second direction.