Differential Pressure Flow Valve With Rotating Main Element
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Solution Overview
Problem
Existing mud-operated pulsers (MOPs) used in Measurement While Drilling (MWD) systems are complex, costly, and prone to frequent failures due to erosion and wear of moving parts, requiring frequent replacement and reducing drilling efficiency.
Innovation Solution
A simplified fluid-operated pulser design using a pilot valve to directly actuate a main valve with fewer moving parts, featuring a spherical or cylindrical main valve element that rotates within a volume adjacent the pilot valve, reducing erosion and eliminating the need for frequent replacements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional mud-operated pulsers with multiple moving parts are used, then the pulser can generate pressure pulses for MWD communication, but the moving parts are prone to erosion and wear requiring frequent replacement
Solution Approach 1:
The patent extracts and eliminates the complex piston assembly, seals, and multiple moving parts from traditional MOP designs. The invention uses a simple poppet valve that opens and closes a flow path in response to pressure differential across it, removing all intermediate mechanical components that were prone to wear and erosion.
Solution Approach 2:
The patent replaces the complex mechanical piston-seal system with a pressure-differential-actuated poppet valve system. The poppet valve responds directly to pressure differential across it, eliminating the need for mechanical seals, pistons, and linkages that were subject to erosion and wear in traditional designs.
2Ease of operation
If complex piston and seal assemblies are used in MOPs, then the valve can be actuated, but the seals wear quickly requiring frequent rebuilding
Solution Approach 1:
The patent removes the piston assembly and seals entirely from the design. The poppet valve is actuated directly by pressure differential across it, eliminating all sealing surfaces and mechanical linkages that required maintenance and rebuilding.
Solution Approach 2:
The patent employs a simple, robust poppet valve design that is inherently more durable and less prone to wear than traditional piston-seal assemblies. The simplified design with no seals makes it effectively maintenance-free for the duration of its service life in the harsh downhole environment.
3Reliability
If traditional MOP designs with multiple components are used, then the valve can function, but the manufacturing cost is high
Solution Approach 1:
The patent extracts and eliminates multiple complex components including pistons, seals, and linkages from traditional MOP designs. The resulting poppet valve design with minimal parts reduces manufacturing complexity and cost while improving reliability through fewer potential failure points.
Solution Approach 2:
The patent combines the functions of multiple components (piston, seals, actuation mechanism) into a single integrated poppet valve design. This consolidation reduces the total number of parts, simplifies manufacturing, and lowers overall system cost while maintaining or improving operational reliability.
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 improved pulser design enhances reliability, reduces operational costs, and extends the life of the valve by minimizing wear, thus improving drilling efficiency and reducing the frequency of equipment replacement.
Implementation Method 1
The invention uses a differential pressure inside the volume under a pilot valve to directly actuate a main valve to block or unblock the fluid flow through the orifice
Implementation Method 2
The main valve element can be spherical or cylindrical and rotate in a volume adjacent the pilot valve. The variable exposure of surface area results in reduced erosion on the main valve element
Data Source
AI summary
The disclosure provides an improved fluid operated pulser. The pulser utilizes a pilot valve to create differential pressure to directly actuate a main valve to block or unblock a fluid flow. The invention provides a main valve that is simpler, more reliable, and wear resistant. The invention uses a differential pressure inside the volume under a pilot valve to directly actuate a main valve to block or unblock the fluid flow through the orifice, and thus creates a positive pressure pulse inside the collar. The main valve has only one moving part, the main valve element, and sometimes a spring. The main valve element can be spherical or cylindrical and rotate in a volume adjacent the pilot valve. The variable exposure of surface area results in reduced erosion on the main valve element to extend the main valve life, and reduced need for stopping expensive operations to replace the pulser.