Telescopic Drill Sub Mandrel WOB Monitoring
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Solution Overview
Problem
Drilling operators face challenges in monitoring and controlling weight-on-bit (WOB) forces during wellbore drilling, as excessive WOB can lead to drill bit deterioration and costly replacements, with existing methods lacking effective real-time monitoring and feedback mechanisms.
Innovation Solution
A tubular apparatus within the drill string featuring telescopically arranged mandrels and biasing members that form a fluid seal when WOB exceeds a predetermined limit, generating a detectable pressure signal in the drilling fluids to indicate excessive force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If drilling operators use traditional methods without real-time monitoring, then the drilling operation can proceed without additional monitoring equipment, but the drill bit may deteriorate faster and require costly replacements
Solution Approach 1:
The patent implements a feedback mechanism where drilling fluid pressure is continuously monitored and fed back to the surface. When WOB exceeds a predetermined threshold, the sealing part closes the flow path, creating a pressure increase that is detected and transmitted to the surface, allowing operators to adjust drilling parameters in real-time to prevent drill bit deterioration
Solution Approach 2:
The patent uses drilling fluid pressure as a hydraulic indicator system. The sealing part acts as a hydraulic valve that closes when WOB exceeds the threshold, creating a pressure buildup in the drilling fluid system that serves as a detectable signal for excessive WOB conditions
2Measurement precision
If a sealing part is added to close the flow path when WOB exceeds threshold, then real-time WOB monitoring is achieved, but the device complexity increases
Solution Approach 1:
The patent combines the WOB sensing function with the existing drilling fluid flow path. The sealing part is integrated into the tubular body's central bore, merging the measurement function with the fluid circulation system, thereby achieving WOB monitoring without adding separate complex monitoring equipment
Solution Approach 2:
The sealing part automatically responds to WOB conditions by closing the flow path when the threshold is exceeded, without requiring external actuation or complex control systems. The drilling fluid pressure itself serves as the actuating force that closes the sealing part, creating a self-regulating monitoring system
3Loss of information
If the sealing part closes the flow path to indicate excessive WOB, then a detectable pressure signal is generated, but the drilling fluid flow is interrupted
Solution Approach 1:
The sealing part closes the flow path only periodically or temporarily when WOB exceeds the threshold, creating intermittent pressure signals rather than continuous flow interruption. Once WOB returns to acceptable levels, the sealing part opens and normal fluid flow resumes, allowing the system to maintain information transmission capability while providing warning signals
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 real-time monitoring of WOB values, preventing drill bit damage by alerting operators when forces exceed safe limits, thereby maintaining drilling efficiency and reducing replacement costs through timely intervention.
Implementation Method 1
a biasing member that biases the first mandrel and the second mandrel into the telescopically extended position, the biasing member having a biasing strength
Implementation Method 2
both sealing parts being within the fluid flow path of the tubular body, the first sealing part and the second sealing part are positioned to come together when the biasing strength of the biasing member is overcome by the weigh-on-bit, together the sealing parts form a fluid seal in the central bore to prevent the flow of fluids through the tubular body
Implementation Method 3
monitoring drilling fluid pressure to detect the formation of the fluid seal in the apparatus
Data Source
AI summary
An apparatus and method for producing pressure signals which indicate when weight-on-bit, during the drilling of a wellbore, exceed a predetermined, upper limit. The apparatus includes a first mandrel and a second mandrel that inserts into and is axially moveable within the first mandrel. The position of the second mandrel may be dependent upon the balance of a biasing member's biasing strength and the weight-on-bit exerted on the drill bit. If weight-on-bit values overcome the biasing strength of the biasing member, the second mandrel may move uphole within the first mandrel and create a pressure signal that is detectable at surface so that the operator is made aware that weight-on-bit values exceed the upper limit.