Blending Signal Analysis for Wellbore Flush Volume Detection
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Solution Overview
Problem
Conventional methods for determining when a fracturing fluid has transitioned from a proppant-laden to a clean state in fracturing operations rely on radioactive densometers, which are burdensome due to regulatory issues, high costs, and additional safety risks.
Innovation Solution
A system and method that analyze blending signals to construct calibration profiles and detect the transition from a proppant-laden to a clean fluid state at a downhole blender, using non-radioactive sensors such as torque sensors, flowmeters, and pressure transducers to control operational characteristics and mark the beginning of a wellbore flush volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If radioactive densometers are used to detect fluid transition from proppant-laden to clean state, then measurement precision is improved, but device complexity and safety risks increase due to regulatory requirements and special handling needs
Solution Approach 1:
The patent removes the radioactive source from the detection system entirely, extracting only the necessary measurement function. Instead of using radioactive densometers, the system employs standard sensors (pressure transducers, flowmeters, torque sensors) that are already present in the fracturing system, thereby eliminating regulatory and safety complexities while maintaining measurement capability through alternative physical principles
Solution Approach 2:
The patent replaces the radioactive measurement system with a mechanical/electrical sensing system. By using torque sensors to detect changes in pump load, flowmeters to measure fluid velocity, and pressure transducers to monitor pressure differentials, the system substitutes the radioactive detection mechanism with conventional mechanical and electrical sensors that do not require special regulatory handling
2Measurement precision
If radioactive densometers are deployed at fracturing sites, then fluid composition monitoring is improved, but ease of operation deteriorates due to special handling and transportation requirements
Solution Approach 1:
The system utilizes sensors and data processing capabilities that are already self-present in the fracturing operation. The control system automatically processes data from existing sensors (pressure, flow, torque) to detect proppant concentration changes and mark flush volume initiation, eliminating the need for separate radioactive densometer deployment and simplifying operational procedures
Solution Approach 2:
The patent makes the existing fracturing system sensors serve multiple functions: they not only monitor standard operating parameters but also detect proppant concentration changes to mark flush volume. This multi-functionality eliminates the need for dedicated radioactive densometers, making the system easier to operate without sacrificing measurement precision
3Measurement precision
If conventional radioactive densometer methods are used, then flush volume marking accuracy is improved, but loss of time increases due to regulatory compliance and installation requirements
Solution Approach 1:
The system performs preliminary calibration by establishing baseline readings from existing sensors during normal proppant injection operations. By pre-configuring the control system to monitor specific parameter combinations (pressure differential, flow rate, torque) and their relationships, the system is ready to immediately detect flush point without requiring time-consuming radioactive densometer setup or regulatory compliance procedures
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 allows for accurate determination of the flush volume initiation without radioactive materials, reducing regulatory and safety concerns while ensuring proper proppant dispersion and well cleanliness, thereby enhancing the efficiency and safety of fracturing operations.
Implementation Method 1
These devices operate on the principle that the density of a fluid is inversely proportional to the count rate of the detector
Data Source
AI summary
Disclosed are systems and methods for detecting the beginning of a flush volume. A blended fluid is output by a fluid blending apparatus and pumped into a wellbore. The blended fluid transitions from a first composition to a second composition. A blending signal comprising time-varying data relating to characteristics of the blending apparatus or measured from sensors associated with the blending apparatus is received. Based on a first portion of the blending signal corresponding to the first composition, a calibration profile is generated. Based on the calibration profile and a second portion of the blending signal corresponding to the second composition, a transition indicator corresponding to a change in the blended fluid from the first composition to the second composition is determined. Based on the transition indicator, a flush signal indicating the beginning of a flush volume being output by the blending apparatus and pumped into the wellbore is generated.