Annulus Pressure Regulation for ESP Power Cable Protection
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Solution Overview
Problem
Hydrocarbon producing wells with electric submersible pumps face pressure fluctuations that can damage downhole equipment, particularly the power cables within the annulus, leading to potential failure and reduced operational life.
Innovation Solution
A surface-positioned pressure regulator and control system that monitors real-time annulus pressure and autonomously adjusts the pressure by bleeding annulus fluid in controlled steps and intervals to maintain optimal pressure, preventing rapid decompression and protecting the power cables.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the annulus pressure is allowed to fluctuate naturally, then the system operates with simpler control mechanisms, but the power cable within the annulus is damaged due to rapid decompression
Solution Approach 1:
The pressure regulator valve is configured to bleed annulus fluid in controlled steps and at predefined time intervals before rapid decompression can occur. This preliminary controlled action prevents the harmful rapid pressure drop that would damage the power cable, while maintaining a relatively simple system architecture without requiring complex real-time control mechanisms.
2Reliability
If the pressure regulator valve operates continuously to maintain constant pressure, then the power cable is better protected, but the system consumes more energy and reduces productivity
Solution Approach 1:
The pressure regulator valve operates periodically at predefined time intervals rather than continuously. This periodic operation maintains adequate pressure protection for the power cable while allowing the system to return to normal production operations between intervals, thereby minimizing the impact on hydrocarbon production efficiency and energy consumption.
3Device complexity
If rapid decompression of the annulus fluid is allowed, then the pressure control system is simpler, but the power cable is damaged
Solution Approach 1:
The pressure regulator valve is configured to bleed annulus fluid in controlled steps beforehand, creating a cushioning effect that prevents rapid decompression. This gradual pressure reduction protects the power cable from the harmful effects of sudden pressure changes while maintaining a simple pressure control mechanism without requiring complex active regulation systems.
Data Source
AI summary
A method includes operating a downhole electrical submersible (ESP) assembly arranged at a distal end of production tubing arranged within a wellbore, monitoring a real-time annulus pressure within an annulus defined between the production tubing and an inner wall of the wellbore, the ESP assembly including a power cable extending within the annulus, providing the real-time annulus pressure reading to a control system arranged at a well surface and in communication with a pressure regulator valve, comparing the real-time annulus pressure reading with a predetermined target pressure for the annulus, sending a command signal to the pressure regulator valve when the real-time annulus pressure exceeds the predetermined target pressure, and operating the pressure regulator valve in one or more steps and at predefined time intervals to thereby selectively bleed an annulus fluid from the annulus, which prevents rapid decompression of the annulus and thereby protects the power cable.