Fluid Pressure Measuring Device for Measurement-While-Drilling Tools
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Solution Overview
Problem
Current drilling tools face challenges in measuring fluid pressure both inside and outside the drill collar simultaneously, leading to instability in pulse wave amplitude due to varying flow rates, which complicates decoding and requires adjustments to the actuator.
Innovation Solution
A fluid pressure measuring device for measurement-while-drilling tools, comprising a first and second sensor assembly and a sealing member, where the sensor assemblies are mounted in a mounting groove on the drill collar, with dedicated liquid inlet holes for measuring pressures inside and outside the drill collar, ensuring accurate and reliable pressure measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the flow rate of liquid decreases, then the liquid consumption is reduced, but the amplitude of the pulse wave is weakened
Solution Approach 1:
The patent employs pressure sensors to detect liquid pressure and flow rate, with the control unit adjusting the actuator opening degree based on detected values to maintain stable pulse wave amplitude while optimizing liquid consumption. This feedback mechanism allows dynamic adjustment to resolve the contradiction between reducing liquid usage and maintaining pulse wave strength.
Solution Approach 2:
The actuator opening degree is dynamically adjusted based on real-time pressure and flow rate measurements. The control unit modifies the actuator position continuously to maintain optimal pulse wave amplitude despite varying flow conditions, transforming a static system into a dynamic one that adapts to changing conditions.
2Reliability
If the actuator opening degree is adjusted to maintain pulse wave amplitude, then the pulse wave stability is improved, but the device complexity increases
Solution Approach 1:
The patent integrates the pressure sensor, flow rate sensor, control unit, and actuator into a unified measurement and control system within the drill collar. By merging these components into a single integrated apparatus, the patent reduces overall system complexity while achieving stable pulse wave amplitude through coordinated operation of all components.
Solution Approach 2:
The control unit automatically adjusts the actuator opening degree based on feedback from pressure and flow rate sensors without requiring external intervention. The system serves itself by using its own sensors and processors to maintain optimal operation, reducing the need for complex external control mechanisms.
3Measurement precision
If pressure measurement is implemented inside and outside the drill collar, then the measurement precision is improved, but the device complexity increases
Solution Approach 1:
The patent divides the pressure measurement function into separate sensors positioned at different locations: one sensor measures pressure inside the drill collar through the center flow channel, while another sensor measures pressure outside the drill collar through the sealing member. This segmentation allows independent optimization of each measurement point while maintaining overall system simplicity.
Solution Approach 2:
The drill collar structure serves multiple functions: it acts as both the drill string component and the housing for the measurement system. The sealing member simultaneously provides sealing and serves as a mounting structure for sensors. This multi-functionality reduces the need for additional dedicated components, thereby reducing device complexity while maintaining measurement precision.
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
The device effectively measures pressures inside and outside the drill collar, enhancing the stability and accuracy of pulse wave amplitude, facilitating better decoding and actuator adjustments.
Implementation Method 1
both the first sensor assembly and the second sensor assembly are fixedly mounted in the mounting groove; a first liquid inlet hole is formed in the sealing member; a second liquid inlet hole communicated with a center flow channel of the drill collar is formed in the mounting groove
Data Source
AI summary
The disclosure relates to a fluid pressure measuring device for a measurement-while-drilling tool, which including a first sensor assembly (1), a second sensor assembly (2) and a sealing member (3), wherein a mounting groove (5) is formed on an outer side wall of a drill collar (4) of a measurement-while-drilling tool; the sealing member (3) is fixedly mounted on the mounting groove (5); a first liquid inlet hole (7) is formed in the sealing member (3); a second liquid inlet hole (9) communicated with a center flow channel (8) of the drill collar (4) is formed in the mounting groove (5); a liquid inlet end of the first sensor assembly (1) is communicated with the first liquid inlet hole (7); and a liquid inlet end of the second sensor assembly (2) is communicated with the second liquid inlet hole (9).