Hydraulic Pulse Valve Wear Reduction via Venturi Pressure Segmentation
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Solution Overview
Problem
Existing downhole pulse valves experience significant wear and erosion due to high differential pressures during water hammer pulses, limiting their usable life and controllability, especially in drilling applications where abrasive materials like barite are present.
Innovation Solution
A novel pulse valve design that incorporates a poppet seat with a constricted throat and bypass passages, reducing differential pressure across internal passages and clearance seals during water hammer pulses by utilizing the Venturi effect to elevate intermediate pressure and decrease valve actuation pressure, thereby reducing wear and increasing controllability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cylindrical sliding clearance seals are used to isolate annular cavities, then precise manufacturing tolerances can control leakage, but surface damage and wear from erosion limit usable life
Solution Approach 1:
The patent removes the vulnerable cylindrical sliding clearance seals from the high-pressure differential zone. By extracting these seals from the harmful environment during water hammer pulses, the design eliminates the primary source of erosion wear while maintaining their sealing function when needed.
Solution Approach 2:
The valve is divided into distinct functional zones: a high-pressure actuation chamber and a low-pressure sealing chamber. This segmentation isolates the clearance seals from the extreme pressure differentials that cause erosion, allowing them to operate only in the gentler low-pressure zone.
2Power
If high differential pressure is used during water hammer pulses, then effective pressure pulsations are generated, but wear and erosion on internal components increases significantly
Solution Approach 1:
The patent segments the pressure system into two independent chambers: the actuation chamber experiences high differential pressure during water hammer to generate effective pulses, while the sealing chamber maintains low pressure to protect components. This spatial segmentation allows both high power output and low wear to coexist.
Solution Approach 2:
The piston acts as an intermediary that decouples the high-pressure actuation function from the low-pressure sealing function. It transmits the force from high-pressure fluid to create effective pressure pulses while keeping the clearance seals in a protected low-pressure environment.
3Reliability
If precise manufacturing tolerances are used for clearance seals, then leakage between annular cavities is controlled, but manufacturing complexity and cost increase
Solution Approach 1:
By segmenting the pressure system into high-pressure and low-pressure chambers, the patent allows clearance seals to operate in the gentler low-pressure zone where larger, easier-to-manufacture tolerances are sufficient, reducing manufacturing complexity while maintaining adequate leakage control.
4Duration of action of moving object
If longer runs of 200 hours are desired, then component wear life must be extended, but abrasive materials like barite accelerate erosion
Solution Approach 1:
The patent extracts the clearance seals from the abrasive high-pressure zone during water hammer pulses. By removing these critical components from direct exposure to abrasive materials under extreme pressure differentials, the design significantly extends operational duration from typical 100-200 hour limits to potentially unlimited service life.
Solution Approach 2:
The design provides beforehand protection by maintaining low pressure in the sealing chamber during high-pressure pulses. This pre-cushioning effect protects the clearance seals from abrasive wear before it can occur, enabling extended operational duration in abrasive environments.
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 design extends the usable life of internal components, enhances controllability of pulse duration, and allows for longer duration pulses, improving drilling efficiency and reducing friction and abrasive wear, while maintaining effective pressure pulsations for enhanced cutting and seismic applications.
Implementation Method 1
reducing differential pressure across internal passages and clearance seals during water hammer pulses by utilizing the Venturi effect to elevate intermediate pressure
Implementation Method 2
Stopping the flow leads to an increase in pressure upstream of the valve and a decrease in pressure downstream of the valve
Data Source
AI summary
Hydraulic pulses are produced each time that a pulse valve interrupts the flow of a pressurized fluid through a conduit. The pulse valve includes an elongate housing having an inlet configured to couple to the conduit to receive the pressurized fluid, and an outlet configured to couple to one or more tools. In the housing, a valve assembly includes a poppet reciprocating between open and closed positions, and a poppet seat, in which the poppet closes to partially block the flow of pressurized fluid through the valve. A bypass passage is configured to connect with a valve actuation vent port such that when the poppet closes the valve actuation pressure is less than the difference between the pressure up stream of the pulse valve and a pilot within the poppet moves between disparate positions to modify fluid paths within the valve. When the valve is open, a relatively lower pressure is produced by a Venturi effect as the fluid flows through a throat in the poppet seat, to provide a differential pressure used to move the pilot and poppet.