Downhole Chemical Injection Pump Powered by ESP Motor
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Solution Overview
Problem
Existing electric submersible pumps (ESPs) face efficiency decline and failure in harsh downhole environments due to scale production and corrosion, and require surface space for chemical injection pumps.
Innovation Solution
A damage-resistant apparatus with an electric submersible pump component and a chemical injection pump component, where the chemical injection pump operates independently and is powered by the ESP, eliminating the need for a surface injection pump by using a capillary tube to receive inhibitors and mix with production fluids.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a surface injection pump is used to inject chemicals through a capillary tube, then chemical injection is achieved, but surface space is required and device complexity increases
Solution Approach 1:
The chemical injection pump is extracted from the surface location and relocated to the downhole environment, specifically positioned below the ESP motor. This eliminates the need for surface injection pumps and reduces surface space requirements while maintaining chemical injection functionality through the capillary tube
Solution Approach 2:
The chemical injection pump is merged with the ESP system by positioning it below the motor and integrating it into the same downhole assembly. The ESP motor provides power to both the main pump and the chemical injection pump, creating a unified system that reduces overall device complexity
2Reliability
If chemicals are injected to protect against scale and corrosion, then ESP reliability improves, but the system requires additional components and space
Solution Approach 1:
The chemical injection pump is merged with the ESP system by positioning it below the motor and integrating it into the same downhole assembly. The ESP motor provides power to both the main pump and the chemical injection pump, creating a unified system that reduces overall device complexity
Solution Approach 2:
The ESP motor serves dual purposes: it powers both the main production pump and the chemical injection pump. This self-service approach eliminates the need for separate power sources and reduces system complexity while ensuring reliable chemical injection for corrosion and scale protection
Data Source
AI summary
A chemical injection pump is installed below an electric submersible pump. In general, the chemical injection pump is either driven by an electric motor that draws power from the electric submersible pump motor or from energized fluid leaving the electric submersible pump output port. The electric submersible pump provides electric or hydraulic power to run the chemical injection pump.