Compressible Load Shoulder Dampens Shock in Downhole Telemetry
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Solution Overview
Problem
Mud-pulse telemetry systems face signal attenuation issues due to friction reduction tools, leading to reduced surface detectable signal levels, which are compounded by increased shock and vibration from higher amplitude pressure pulses, negatively impacting the performance and reliability of downhole communications.
Innovation Solution
A shock and vibration dampener is positioned at the point of impact for the piston in the mud pulse telemetry tool, selectively movable to generate high amplitude pressure pulses while reducing detrimental effects of shock and vibration on sensitive electronics, using a combination of springs or fluid compression to absorb impact and dissipate kinetic energy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If friction reduction tools are used to attenuate positive mud-pulse signals, then signal transmission through the drill string is improved, but surface detectable signal levels are reduced
Solution Approach 1:
The patent changes the amplitude parameter of the pressure pulses by designing tighter poppet and orifice combinations and increasing piston velocity to generate higher amplitude pulses that can overcome signal attenuation from friction reduction tools while maintaining reliable transmission
2Illumination intensity
If higher amplitude pressure pulses are generated to compensate for signal attenuation, then surface detectable signals are increased, but impact loading on the mud-pulse tool increases
Solution Approach 1:
The patent applies beforehand cushioning by positioning a shock sonde between the pulser tool and sensor sonde to absorb and dampen the impact shocks generated by high velocity piston movement, protecting the tool from excessive impact loading while maintaining the ability to generate high amplitude pressure pulses
3Stress or pressure
If tighter poppet and orifice combinations are used to generate higher amplitude pressure pulses, then pressure pulse amplitude is increased, but impact energy on the piston stop increases
Solution Approach 1:
The shock sonde is positioned beforehand at the point of piston impact to absorb and dissipate the kinetic energy of the high velocity piston, reducing the impact energy transmitted to the metal stop while allowing the tighter poppet and orifice combination to generate the required high amplitude pressure pulses
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 solution enables reliable detection of high amplitude pressure pulses at the surface while minimizing the adverse effects of shock and vibration on drill string electronics, improving the overall performance and reliability of downhole communications without increasing tool length or cost.
Implementation Method 1
using a combination of springs or fluid compression to absorb impact and dissipate kinetic energy
Implementation Method 2
A shock and vibration dampener is positioned at the point of impact for the piston in the mud pulse telemetry tool, selectively movable to generate high amplitude pressure pulses while reducing detrimental effects of shock and vibration
Implementation Method 3
A flow mandrel is positioned within the fluid chamber and is movable between a first position and a second position. The flow mandrel dampens shock and vibration from impact of the piston with the piston stop by moving from the first position to the second position in response to the impact
Data Source
AI summary
A mud pulse telemetry tool includes a dampener for reducing shock and vibration. The mud pulse telemetry tool includes a housing having a shoulder formed along an inner surface thereof, the housing including an orifice formed therein. A piston assembly is longitudinally movable in the housing between a retracted position and an extended position. The piston assembly includes a poppet disposable in the orifice in the extended position and a piston connected to the poppet. The dampener is disposed longitudinally between the piston and the shoulder, the piston being movable in contact with the dampener when the piston assembly is in the extended position.