Variable Orifice Gas Lift Valve Autonomous Pressure Control
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Solution Overview
Problem
In hydrocarbon production, gas lift methods face challenges in maintaining optimal production pressure and flow rates due to varying reservoir conditions, leading to inefficiencies and potential wear on gas lift valves.
Innovation Solution
A variable orifice gas lift valve controlled autonomously by sensors, adjusting the injection flow rate based on real-time production pressure and flow rate data to optimize gas lift operations, minimizing wear and ensuring optimal production conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If gas lift valve operates with fixed orifice, then device complexity is reduced, but productivity decreases due to inability to adapt to varying reservoir conditions
Solution Approach 1:
The gas lift valve incorporates a variable orifice that can dynamically adjust its opening size in response to changing reservoir conditions. The orifice transitions from a fixed static opening to a dynamic adjustable aperture, allowing the valve to adapt to varying production rates and reservoir pressures, thereby maintaining optimal productivity throughout the well's life cycle.
Solution Approach 2:
The valve design enables changing the flow parameters by adjusting the orifice size. As reservoir pressure declines and production conditions change, the orifice diameter can be modified to maintain appropriate gas injection rates, allowing continuous optimization of lift efficiency without requiring valve replacement.
2Reliability
If gas lift valve operates without control mechanism, then ease of operation is improved, but reliability decreases due to inability to maintain optimal production pressure
Solution Approach 1:
The gas lift valve incorporates a feedback mechanism where downhole sensors monitor production pressure and reservoir conditions, transmit this information to surface control systems, which then adjust the orifice size accordingly. This closed-loop control ensures production pressure remains within optimal ranges while automating the operation to maintain reliability without requiring manual intervention.
Solution Approach 2:
The valve system is designed to monitor and adjust its own operation based on real-time conditions. The automated control system performs self-diagnosis and self-adjustment of the orifice position, enabling the valve to maintain optimal performance autonomously without requiring frequent manual operations or monitoring.
3Productivity
If gas lift valve operates continuously at high flow rate, then productivity is maintained, but loss of substance increases due to excessive gas consumption
Solution Approach 1:
The variable orifice mechanism allows the valve to adjust the gas injection rate parameter based on actual production needs. When reservoir pressure is high, the orifice closes partially to reduce gas consumption. When pressure declines, the orifice opens to maintain productivity. This dynamic parameter adjustment optimizes the ratio between production output and gas input, reducing waste.
Solution Approach 2:
Instead of maintaining continuous maximum gas injection, the valve employs partial action by modulating the orifice opening to provide only the necessary amount of lift gas required at any given moment. This prevents excessive gas injection that would waste resources while still maintaining adequate production levels through precisely dosed gas injection.
4Duration of action of stationary object
If gas lift valve operates without adjustment, then device complexity is reduced, but duration of action decreases due to premature valve wear
Solution Approach 1:
The feedback control system continuously monitors valve operation parameters and adjusts the orifice position to prevent extreme operating conditions that accelerate wear. By maintaining operation within optimal parameters and avoiding sudden pressure differentials or excessive flow rates, the system extends valve lifespan while the automated control compensates for the added complexity.
Solution Approach 2:
The automated control system performs routine adjustments and maintenance functions autonomously, preventing wear through consistent optimal operation. The system self-regulates to avoid conditions that would cause premature failure, effectively serving its own maintenance needs and extending service life without requiring external intervention or simplification.
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
This solution enhances production efficiency by maintaining optimal production pressure and flow rates, reducing wear on the valve and optimizing gas usage, thereby improving hydrocarbon recovery rates and extending equipment lifespan.
Implementation Method 1
Lift gas may enter the production string, under control of the variable orifice gas lift valve, to mix with production fluids within the production string and assist to lift said production fluids to surface, by the known effect of reducing the effective weight of the fluid column within the production string
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A method for injection of a lift gas into a wellbore production string comprises determining production pressure within the production string, and autonomously controlling a variable orifice gas lift valve in accordance with the determined production pressure, wherein the variable orifice gas lift valve controls the injection flow rate of the lift gas into the production string. A valve comprises a housing defining an inlet, an outlet and a flow path therebetween, and a valve member linearly moveable within the housing between first and second positions to vary flow along the flow path, wherein the valve member is prevented from rotation relative to the housing during linear movement between the first and second positions. The valve further includes a rotary drive and a transmission arrangement interposed between the rotary drive and the valve member for converting rotation of the rotary drive to linear movement of the valve member.