Hydraulic Pulse Valve Venturi Pilot Control
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Solution Overview
Problem
Existing hydraulic impulse generators for wellbore intervention tools produce short pressure pulses with high differential pressure, leading to tool wear and limited flow and pressure availability, and lack control over pulse amplitude, which is necessary for varying fluid flow rates and applications.
Innovation Solution
A novel pulse valve design featuring an elongate housing with a poppet and pilot mechanism that uses differential pressures created by a Venturi effect to control fluid flow, allowing for adjustable pulse amplitude and duration, and reducing pressure differential, enabling longer pulse duration and controlled cycle rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If existing hydraulic impulse generators are used, then pressure pulses are generated, but the pulse duration is short which limits pulse energy and effectiveness
Solution Approach 1:
The valve system dynamically adjusts the pulse duration by controlling the opening and closing timing of the poppet valve. The pilot valve dynamically regulates the pressure differential across the main valve, enabling flexible control of pulse characteristics to achieve longer duration pulses with optimized energy delivery.
Solution Approach 2:
The system changes the pressure differential parameter by using the pilot valve to modulate the pressure on both sides of the main valve. This allows extension of pulse duration while maintaining controlled energy release, directly addressing the limitation of short pulses in existing generators.
2Stress or pressure
If existing hydraulic impulse generators operate at high differential pressure, then pressure pulses are generated, but tool wear increases and flow and pressure availability for other tools is limited
Solution Approach 1:
The pilot valve acts as an intermediary component that mediates the pressure differential control. Instead of applying high differential pressure directly across the main valve, the pilot valve gradually modulates the pressure, reducing shock loads and wear on the main valve while still generating effective pressure pulses.
Solution Approach 2:
The system provides cushioning by using the pilot valve to pre-regulate pressure changes before they reach the main valve. This gradual pressure modulation reduces impact stresses and wear on valve components, enhancing reliability while maintaining pulse generation capability.
3Quantity of substance
If existing hydraulic impulse generators are used, then pressure pulses are generated, but there is no independent control over pulse amplitude which limits adaptability to varying fluid flow rate requirements
Solution Approach 1:
The pilot valve creates a feedback control mechanism where the pressure differential across the main valve is continuously regulated. By adjusting the pilot valve opening, the system provides independent control over pulse amplitude while maintaining the required fluid flow rate, enabling adaptation to varying job requirements.
Solution Approach 2:
The system dynamically controls pulse amplitude through the pilot valve's ability to modulate pressure in real-time. This dynamic control allows independent adjustment of pulse characteristics without changing the overall fluid flow rate, providing versatility for different applications such as hole cleaning or chemical placement.
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 generates longer duration pressure pulses with increased impulse energy, reduces tool wear, and allows for controlled impulse amplitude, enhancing drilling efficiency, chemical placement, and seismic applications by maintaining pulse duration and cycle rate.
Implementation Method 1
A differential pressure arises as a result of a higher pressure of the pressurized fluid within the internal passage and a relatively lower pressure produced in the at least one port in the throat and adjacent volume while the poppet is in the open position. The relatively lower pressure is produced in the at least one port by a Venturi effect as the pressurized fluid flows through the throat of the poppet seat
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 at least partially block the flow of pressurized fluid through the valve. 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. An optional bypass reduces the pulse amplitude.