Dual-Cone Flow Stabilizer for Gas Well Liquid Loading
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Solution Overview
Problem
Gas wells face liquid loading issues due to declining reservoir pressure, leading to reduced production and necessitating shut-in, as existing methods like artificial lift and velocity strings are inefficient in maintaining stable gas-liquid flow.
Innovation Solution
A dual-cone flow stabilizing device is installed in the production tubing to accelerate gas velocity and maintain a stable liquid film, preventing liquid film reversal and optimizing flow efficiency by modifying gas phase velocity and controlling pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a velocity string (smaller diameter tubing) is installed to increase gas velocity and lift liquid, then liquid loading is eliminated, but production rate decreases significantly
Solution Approach 1:
The flow stabilizing device segments the flow path into multiple regions (central core flow and annular flow between device and tubing wall), allowing different flow patterns in different zones to optimize both velocity and production
Solution Approach 2:
The invention transitions from one-dimensional velocity increase (velocity string) to two-dimensional flow control by creating a structured flow pattern with central and annular flow paths, enabling simultaneous optimization of velocity and production rate
2Reliability
If artificial lift or conventional pumping methods are used to re-energize fluid flow, then liquid loading is mitigated, but device complexity and operational cost increase
Solution Approach 1:
The flow stabilizing device uses the existing two-phase flow itself to generate the desired flow pattern, without requiring external power sources, moving parts, or complex mechanical lift mechanisms
Solution Approach 2:
The invention replaces complex mechanical lift systems (pumps, plunger mechanisms) with a passive flow conditioning device that uses fluid dynamics and pressure gradients to achieve flow stabilization
3Stability of the object's composition
If gas flow rate is increased to maintain annular flow regime, then liquid lifting capability is improved, but pressure requirements increase and well performance declines
Solution Approach 1:
The device changes flow parameters (velocity distribution, pressure gradient) through its geometric structure, creating optimal flow conditions without requiring excessive gas flow rates or pressures
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 solution extends the life of gas wells by sustaining a steady two-phase annular flow regime, increasing gas production and recovering condensate, with a 400% increase in production compared to conventional coiled tubing velocity strings.
Implementation Method 1
a first portion facing upstream, wherein the distal end of the first portion forms a first apex that faces upstream; a second portion facing downstream, wherein the distal end of the second portion form a second apex that faces downstream; a passageway extending from the first apex through the second apex
Implementation Method 2
The flow stabilizing device is dimensioned and configured so that the exterior surface of the flow stabilizing device does not touch the adjacent inner wall of the tubing, wherein a first portion of the mixture flows through the passageway; and wherein a second portion of the mixture flows around the flow stabilizing device
Data Source
AI summary
A method and apparatus for stabilizing gas/liquid flow in a vertical conduit by utilizing one or more flow stabilizing devices positioned inside the conduit along a structural support tube. The flow stabilizing devices are configured and dimensioned to accelerate the velocity of the flowing two-phase fluid mixture in the conduit to sustain upward liquid flow.