Compact Cyclone Well Testing for Wet-Gas Measurement
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Solution Overview
Problem
Conventional well testing systems for oil and gas wells suffer from high measurement uncertainty and require extensive rig-up and rig-down times, making them inefficient and costly, especially for wet gas wells.
Innovation Solution
A compact well testing system incorporating a two-phase cyclone separator to separate gas-liquid-sand flows into distinct streams, using gas and liquid mass flow meters and a sand measurer, with optional microwave water cut meter and control valves, for accurate measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional horizontal three-phase separator is used, then gas, oil, and water can be separated, but the measurement uncertainty is high (about 5% for each phase) and the system requires extensive rig-up and rig-down time
Solution Approach 1:
The conventional horizontal three-phase separator is segmented into two separate cyclone separators: a solid-liquid cyclone separator that separates sand from gas-liquid mixture, and a gas-liquid cyclone separator that separates gas from liquid. This segmentation allows each separator to specialize in one separation task, improving measurement precision for each phase while reducing overall system complexity and rig-up time
Solution Approach 2:
The patent replaces the conventional mechanical three-phase separator with cyclone separators that utilize centrifugal force generated by rotating flow. This mechanical substitution eliminates the need for complex internal mechanics and long residence times required by conventional separators, thereby reducing rig-up time while achieving better separation and measurement accuracy
2Productivity
If multiphase flow meters (MPFM) are used for wet gas wells, then real-time monitoring is achieved, but the measurement uncertainty is high (5-20%) and accuracy is insufficient for highly accurate well testing
Solution Approach 1:
The invention extracts the solid particles (sand) from the wet gas flow using a solid-liquid cyclone separator before the gas-liquid separation stage. By removing solids that interfere with MPFM measurements, the subsequent gas-liquid cyclone separator and flow meters can operate with much higher accuracy, reducing measurement uncertainty from 5-20% to less than 1% for gas and liquid phases
Solution Approach 2:
The solid-liquid cyclone separator performs preliminary separation of sand particles from the gas-liquid mixture before the flow enters the gas-liquid cyclone separator and flow measurement devices. This preliminary action prevents sand from interfering with flow meter measurements, thereby improving measurement precision while maintaining real-time monitoring capability
3Reliability
If a conventional well testing system is used, then comprehensive separation of oil, gas, and water is achieved, but the system complexity and operational costs are high
Solution Approach 1:
The patent merges the functions of solid-liquid separation and gas-liquid separation into a compact two-stage cyclone separator system. The solid-liquid cyclone separator handles sand removal, while the gas-liquid cyclone separator handles gas-liquid separation. This merging of functions into specialized cyclone units reduces overall system complexity compared to conventional multi-component separators while maintaining reliable separation of all three phases
Solution Approach 2:
The invention changes the operating parameters of the cyclone separators, specifically utilizing high rotational velocity and centrifugal force to achieve rapid separation. By optimizing parameters such as inlet velocity, cyclone diameter, and separation pressure, the system achieves complete separation of gas, liquid, and solid phases with simpler equipment and lower operational costs
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
Achieves high accuracy in measuring gas, liquid, and sand rates with average bias errors of −0.35% and 1.1% respectively, reducing operational inefficiencies and costs.
Implementation Method 1
generating strong centrifugal force with the demisting cyclone to separate liquid droplets into an annulus through an tangential opening slot of the demisting cyclone wall
Implementation Method 2
allowing the gas-liquid-sand flow to enter a solid separation cyclone; generating strong centrifugal force with the solid separation cyclone to separate solid particles into an annulus through an tangential opening slot of the solid cyclone wall
Data Source
AI summary
A cyclonic system and method for gas-liquid-solid separation is provided. The system may comprise a Gas-Liquid Cylindrical Cyclone (GLCC) for gas-liquid separation, a cyclone for solid particle separation, and a cyclone for droplet separation. The GLCC may have a vertical churn flow coalescer and a horizontal inlet with an internal inclined flow diverting plate to direct the flow tangentially to the GLCC. The cyclone with a horizontal tangential inlet for solid separation may be installed at the lower section of the vertical churn flow coalescer. Solid particles may be collected at the bottom and discharged. The cyclone for droplet separation may be installed at the upper section of the GLCC. Liquid may be collected in the annulus and drained to the lower section of the GLCC.