Variable Geometry Mud Pulser Flow Regulation
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Solution Overview
Problem
Existing mud pulsers in drilling operations are limited in their effectiveness across a range of drilling fluid flowrates, often failing to generate detectable pressure pulses at flowrates outside a specific range, which hampers data transmission and steering decisions during wellbore formation.
Innovation Solution
A mud pulser system featuring a stator with angularly spaced channels, a rotor with slots that register and unregister with the channels, and a plug assembly that selectively controls fluid flow to generate pressure pulses by altering the cross-sectional area, allowing for adjustable flow velocities and pulse generation across varying flowrates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mud pulsers use internally located valves with reciprocating piston or rotating shear valve to generate pressure pulses, then data transmission capability is improved, but the device becomes ineffective above or below certain flowrates
Solution Approach 1:
The invention changes the operational parameters of the mud pulser by introducing a variable geometry nozzle system that can adjust its cross-sectional area. This allows the device to maintain effective pressure pulse generation across a broader range of drilling fluid flowrates by dynamically adjusting the flow parameters rather than being fixed to a specific operating range
Solution Approach 2:
The invention transitions from static valve mechanisms to a dynamic variable geometry nozzle system. The nozzle's cross-sectional area can be adjusted in real-time to match changing flow conditions, making the mud pulser adaptive to varying drilling operations rather than being limited to fixed flowrate ranges
2Power
If the cross sectional area of the drilling fluid flow path is selectively altered with internally located valves, then pressure pulses are generated for data transmission, but the system is limited to a specific flowrate range
Solution Approach 1:
The invention modifies the flow path geometry parameters through a variable cross-sectional area nozzle design. By changing the nozzle geometry, the system can generate adequate pressure pulses across varying flowrates, extending operational flexibility beyond fixed-flowrate valve systems
Solution Approach 2:
The variable geometry nozzle serves multiple functions: it acts as a flow regulator, pressure pulse generator, and adaptability mechanism all in one component. This multi-functional design replaces the need for complex valve systems while expanding the operational flowrate range
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 system enables the generation of detectable pressure pulses across a broader range of drilling fluid flowrates, enhancing data transmission and steering capabilities during wellbore operations by controlling fluid velocity and flow regulation.
Implementation Method 1
a rotor having one or more slots that selectively move into and out of registration with outlets of the channels with rotation or oscillation of the rotor... the drilling fluid flowing through the one or more channels other than the designated channel is at a velocity of sufficient magnitude to generate pressure pulses in the drilling fluid
Implementation Method 2
a plug assembly that selectively defines a barrier to a flow of the drilling fluid through a designated channel... When the plug assembly defines a partial barrier to the flow of drilling fluid through the only channel of the stator, the drilling fluid that can still flow through the channel is at the velocity of sufficient magnitude
Data Source
AI summary
A velocity of a flow of drilling fluid is adjusted to a magnitude that is within the operating range of a mud pulser disposed in the flow of the drilling fluid. A stator in the mud pulser directs the flow of drilling fluid along one or more separate paths. The paths are defined by channels that extend axially along an outer surface of the stator and that are spaced angularly apart from one another. Also in the mud pulser is a rotor that alternatingly blocks the paths. The velocity is adjusted with a plug assembly that blocks flow through a designated channel. One type of plug assembly is a disk with passages that register with less than all of the channels, and that mounts on a downstream end of the stator. Other types of plug assemblies mount in the designated channel to block the flow path.