Capacitor Plate Measurement Tool for Virgin Fluid Identification
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Solution Overview
Problem
Existing formation testing tools face challenges in accurately distinguishing between virgin formation fluid and contaminated fluid during borehole drilling, due to contamination from drilling fluids, which affects the reliability of productivity assessments in oil and gas reservoirs.
Innovation Solution
A measurement tool that uses a pair of capacitor plates to measure the dielectric constant of fluids within a pipe, allowing for the differentiation between virgin and contaminated fluids by determining the capacitance and resistivity of the fluid, thereby providing more accurate assessments of reservoir productivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If formation testing is conducted during borehole drilling, then productivity assessment data can be obtained, but the formation fluid becomes contaminated with drilling fluid filtrate
Solution Approach 1:
The instrument measures dielectric constant and resistivity parameters of formation fluid in advance, before contamination occurs or while contamination is minimal. This preliminary measurement approach allows identification of virgin formation fluid characteristics before drilling fluid infiltrates the formation zone, ensuring reliable productivity assessment data is captured at the optimal time window.
Solution Approach 2:
The patent uses dielectric constant and resistivity measurements as intermediary parameters to indirectly identify and differentiate virgin formation fluid from contaminated fluid. These electrical properties serve as mediators that reveal fluid composition and contamination levels without requiring direct chemical analysis, enabling real-time assessment of fluid purity during the testing process.
2Measurement precision
If multiple fluid parameters are measured to identify virgin fluid, then measurement precision improves, but device complexity increases
Solution Approach 1:
The instrument combines dielectric constant measurement and resistivity measurement capabilities into a single integrated tool. By merging these two measurement functions that both relate to electrical properties of fluid, the device achieves enhanced precision in identifying virgin formation fluid through correlated parameter analysis while avoiding the complexity of separate independent measurement systems.
Solution Approach 2:
The measurement instrument is designed with multi-functionality, capable of measuring both dielectric constant and resistivity parameters using a unified sensor system. This universal approach allows a single device to perform multiple measurement tasks that together provide comprehensive fluid characterization, improving identification precision without proportionally increasing device complexity.
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 precise identification of virgin formation fluid, reducing contamination-related errors and enhancing the accuracy of reservoir assessments by measuring dielectric constant and resistivity simultaneously, even in challenging downhole conditions.
Implementation Method 1
a pair of capacitor plates mounted adjacent to the pipe, a signal generator which can deliver an alternating electrical signal to at least one of the capacitor plates, and a detector for measuring a signal dependent upon the electrical capacitance between the capacitor plates
Implementation Method 2
the fluid being tested in order to evaluate the likely productivity of the oil or gas well... determining the dielectric constant and resistivity of the fluid
Data Source
AI summary
This invention relates to a measurement tool and method of use, and in particular to a measurement tool for use in determining a parameter of a stationary or moving fluid. The measurement tool has been designed primarily for use in borehole formation testing. The measurement tool can measure the dielectric constant of a fluid within a pipe or surrounding the tool. The pipe or wall between the tool and the fluid is electrically insulating. The tool has pair of capacitor plates mounted adjacent to the pipe or wall, a signal generator which can deliver an alternating electrical signal to at least one of the capacitor plates, and a detector for measuring a signal dependent upon the electrical capacitance between the capacitor plates. The measurement tool can additionally measure the electrical resistivity of the fluid.