Eccentric Ported Disc Pressure Pulsing Tool
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Solution Overview
Problem
Current well stimulation tools are unable to generate optimal fluid pressure pulses with low frequencies, short rise times, and slow decay rates, especially in narrower tubing like coiled tubing, due to their size and operational speed limitations.
Innovation Solution
The development of a pressure-pulsing tool that includes an upstream ported disc and a downstream ported disc with eccentric ports, which rotate to form a passageway for fluid to exit, allowing for the generation of fluid pressure pulses by storing fluid in a chamber and releasing it through aligned eccentric ports, optimizing pressure pulse characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If current well stimulation tools are used, then they can operate in typical well casings, but they cannot pass through narrower inner diameters of tubing such as coiled tubing
Solution Approach 1:
The patent employs a nested structure where the rotor assembly with eccentric ports is positioned inside the stator housing, and the entire pressure pulsing tool is designed to fit within coiled tubing inner diameters. This nested arrangement allows the tool to pass through narrow tubing while maintaining functional components
Solution Approach 2:
The tool is divided into segmented components including the stator housing, rotor assembly, and eccentric port structures that can be arranged in a compact configuration, enabling the tool to fit within constrained diameters while preserving functionality
2Power
If tools operate at typical mud motor speeds, then they can provide high power output, but they cannot generate optimal pressure pulses with low frequencies and short rise times
Solution Approach 1:
The patent uses periodic action by incorporating eccentric ports that create pulsating fluid flow at specific intervals during rotor rotation. The eccentric port geometry and rotation speed are optimized to produce periodic pressure pulses with low frequencies (e.g., 0.1-10 Hz) and short rise times, achieving optimal well stimulation effects without requiring high continuous rotation speeds
Solution Approach 2:
The system dynamically adjusts pressure pulse characteristics by varying rotor rotation speed and eccentric port configuration, allowing transition from high-speed continuous operation to low-speed pulsating operation to match different well stimulation requirements
3Manufacturing precision
If fluid is stored in a chamber and released through aligned eccentric ports, then optimal pressure pulse characteristics are achieved, but the device complexity increases
Solution Approach 1:
The patent employs asymmetry through eccentric ports that are offset from the centerline of the rotor and stator. This asymmetric configuration creates the pressure differential needed for pulse generation while maintaining a relatively simple overall device structure. The eccentric offset distance can be optimized to achieve desired pulse characteristics without adding complex control mechanisms
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 tool effectively generates pressure pulses with amplitudes of 1,000 to 1,300 psi, suitable for well stimulation, including chemical placement and waterflood recovery, by exploiting the elasticity of well equipment to produce optimal fluid displacement and pressure.
Implementation Method 1
The upstream ported disc may include an upstream eccentric port that rotates about the central axis as the upstream ported disc rotates. The downstream ported disc may include a downstream eccentric port. The downstream eccentric port may align with the upstream eccentric port to form a passageway for fluid to exit from the chamber
Implementation Method 2
The tool effectively generates pressure pulses with amplitudes of 1,000 to 1,300 psi, suitable for well stimulation, including chemical placement and waterflood recovery, by exploiting the elasticity of well equipment to produce optimal fluid displacement and pressure
Data Source
AI summary
Apparatuses and methods for generating fluid pressure pulses are disclosed. An example apparatus may include a chamber that can collect fluid and an upstream ported disc coupled to a downstream end of the chamber. The upstream ported disc may rotate about a central axis. The upstream ported disc includes an upstream eccentric port that rotates about the central axis as the upstream ported disc rotates. The example apparatus may include a downstream ported disc coupled to a downstream end of the upstream ported disc such that the downstream ported disc remains substantially rotationally fixed relative to the upstream ported disc. The downstream ported disc includes a downstream eccentric port that may align with the upstream eccentric port to form a passageway for fluid to exit from the chamber to outside of the apparatus, at some time in a rotation cycle of the upstream ported disc.