Downhole Sensor Tool for Matrix Acidizing Fluid Control
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Solution Overview
Problem
During matrix acidizing procedures, it is challenging to ensure that acid uniformly stimulates both high and low permeability zones in a formation, as the injected acid often preferentially flows into high permeability zones, leading to inadequate invasion of low permeability zones.
Innovation Solution
A downhole tool equipped with sensors to measure the velocity and temperature of the wellbore fluid, allowing for the determination of heat flux and acid invasion length, which helps in optimizing the acid placement by adjusting the nozzle position to encourage acid flow into low permeability zones.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If acid is injected into the formation during matrix acidizing, then the permeability of high permeability zones is improved, but the acid preferentially flows into high permeability zones leaving low permeability zones inadequately stimulated
Solution Approach 1:
The patent employs real-time monitoring of downhole temperature and flow rate parameters to detect acid invasion patterns. Temperature sensors measure the thermal signature of acid-rock reactions, while flow rate sensors track fluid movement. This feedback information is used to determine whether acid is preferentially entering high or low permeability zones, enabling dynamic adjustment of injection parameters to achieve uniform acid distribution across different permeability zones.
Solution Approach 2:
The patent adjusts injection parameters including flow rate, pressure, and temperature based on real-time downhole measurements. By changing these parameters dynamically during the acidizing process, the system optimizes acid diversion into low permeability zones while maintaining effective stimulation of high permeability zones, thereby achieving uniform permeability restoration across the formation.
2Manufacturing precision
If downhole sensors are deployed to monitor acid invasion in real-time, then acid placement can be optimized, but device complexity increases
Solution Approach 1:
The downhole tool integrates multiple sensors (temperature, flow rate, pressure) and control functions into a single multi-functional device. This universal tool performs both monitoring and control operations, reducing the need for separate specialized equipment while achieving precise acid invasion control through real-time parameter measurement and adjustment.
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 enables more effective acid distribution, improving the restoration of permeability in low permeability zones by monitoring and adjusting the acid invasion length and heat flux in real-time, thereby enhancing the overall matrix acidizing process.
Implementation Method 1
determining parameters of a wellbore fluid during a matrix acidizing procedure using at least a first sensor and a second sensor. The parameters include velocity of the wellbore fluid and a temperature difference between the first sensor and the second sensor
Implementation Method 2
a nozzle for ejecting a reactive fluid used in association with a matrix acidizing procedure adjacent the formation
Data Source
AI summary
Methods and apparatus of adjusting matrix acidizing procedures are disclosed. An example method includes determining parameters of a wellbore fluid during a matrix acidizing procedure using at least a first sensor and a second sensor. The parameters include velocity of the wellbore fluid and a temperature difference between the first sensor and the second sensor. The method also includes, based on the parameters, determining a characteristic relative to an invasion length of a reactive fluid within the formation, the reactive fluid used in association with the matrix acidizing procedure.