Weight-on-bit Sensor Correction via Pressure Differential
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Solution Overview
Problem
The existing drill bits face challenges in accurately measuring weight-on-bit due to the pressure differential caused by drilling fluid, which affects the reliability of measurements made by weight-on-bit sensors.
Innovation Solution
The method involves determining a corrected weight-on-bit by using sensors to measure both the weight-on-bit during drilling and the pressure differential across the drill bit, allowing for the subtraction of the pressure-induced offset to obtain accurate weight measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If weight-on-bit sensors are used to measure drilling parameters, then drilling operations can be monitored and controlled, but the measurements are affected by pressure differential across the drill bit body caused by drilling fluid
Solution Approach 1:
A pressure sensor is introduced as an intermediary device to measure the pressure differential across the drill bit body. This mediator allows the system to detect and quantify the harmful pressure effect, which is then used to correct the weight-on-bit measurements through computational processing, eliminating the measurement error without requiring physical modification of the load cell sensor itself.
Solution Approach 2:
The patent replaces purely mechanical weight measurement with a hybrid system that combines mechanical sensing (load cell) with pressure sensing and computational correction. Instead of relying solely on mechanical measurement that is directly affected by pressure, the system substitutes part of the measurement function with pressure sensing and mathematical correction, transforming a mechanical measurement problem into a combined sensorimetric-computational solution.
2Duration of action of stationary object
If drilling fluid is pumped through the drill bit to cool and lubricate the drill bit, then drill bit performance and life are improved, but a pressure differential is created that affects weight and torque measurements
Solution Approach 1:
The system implements feedback by continuously monitoring the pressure differential across the drill bit body using a pressure sensor and using this information to dynamically correct the weight-on-bit measurements. The correction factor is calculated based on the measured pressure differential and applied in real-time to compensate for the pressure effect, creating a closed-loop measurement system that adapts to changing drilling conditions.
Solution Approach 2:
The patent changes the measurement parameters by introducing pressure as an additional measured variable that is used to adjust the weight measurement. Instead of treating weight measurement as a single static parameter, the system transforms it into a dynamic parameter that is corrected based on simultaneous pressure measurements, allowing the measurement system to adapt to the changing physical conditions during drilling.
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 precise correction of weight-on-bit measurements, improving the accuracy of drilling operations and extending the life of drill bits and drilling assemblies by accounting for fluid pressure effects.
Implementation Method 1
the pressure inside the drill bit is greater than the pressure on the outside of the drill bit, thereby creating a pressure differential across the drill bit body. This pressure differential causes the drill bit body to act as a pressure vessel, affecting the measurements made by the weight-on-bit sensors in the drill bit.
Data Source
AI summary
In one aspect, a method of determining a corrected weight-on-bit is provided, which method, in one embodiment, may include: drilling a wellbore with the drill bit; determining a weight-on-bit while drilling the wellbore; determining a pressure differential across an effective area of the drill bit while drilling the wellbore; and determining the corrected weight-on-bit from the determined weight-on-bit and the determined pressure differential.