Self-Powered Downhole Injection via Wellhead Pressure
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Solution Overview
Problem
Downhole injection systems for wells at remote locations face high installation and maintenance costs, and reliance on unreliable or unavailable electrical power for pumping chemicals into the wellbore.
Innovation Solution
Self-powered downhole injection systems utilize the pressure from wellhead assemblies, such as gases and fluids, to pump chemicals into the wellbore without requiring external power or electricity, employing a pumping chamber with a movable plate that separates wellhead pressure and chemical portions to facilitate the flow of chemicals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrical pumps are used to drive chemicals into the wellbore, then chemical injection can be achieved, but external power sources are required which are unreliable or unavailable at remote locations
Solution Approach 1:
The system uses the wellhead assembly's own pressure to drive the movable plate and inject chemicals, making the system self-powered without external electricity. The wellhead pressure portion receives pressure from the wellhead assembly and uses it to move the movable plate back and forth, enabling self-service operation at remote locations.
Solution Approach 2:
The movable plate acts as an intermediary that transfers energy from the wellhead pressure portion to the chemical portion. It converts the pressure energy from wellhead materials into mechanical motion to pump chemicals into the wellbore, bridging the energy transfer without requiring external power sources.
2Ease of manufacture
If electrical pumps are installed at remote well locations, then chemical injection is possible, but installation and maintenance costs increase
Solution Approach 1:
The wellhead assembly serves multiple functions: it not only controls well pressure but also acts as the power source for chemical injection by providing pressure to the wellhead pressure portion. This multi-functionality eliminates the need for separate power systems, simplifying installation and reducing complexity at remote locations.
Solution Approach 2:
The invention extracts the power source function from external electrical systems and integrates it into the wellhead assembly itself. By taking out the dependency on external power infrastructure, the system becomes simpler to install and maintain at remote well locations without requiring complex power delivery systems.
3Power
If a movable plate is used to separate wellhead pressure and chemical portions, then self-powered pumping is achieved, but the system requires selective communication with wellhead assembly
Solution Approach 1:
The pumping chamber is segmented into distinct portions: the wellhead pressure portion and the chemical portion, separated by the movable plate. This segmentation allows independent pressure application from the wellhead assembly while maintaining chemical containment, achieving self-powered pumping through structured division of functions.
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
Enables the effective and cost-efficient injection of chemicals into the wellbore using wellhead pressure, reducing reliance on external power sources and lowering operational costs, while maintaining reliable chemical delivery.
Implementation Method 1
a wellhead pressure portion (112) in selective communication with the wellhead assembly, where the wellhead pressure portion is maintained at a wellhead pressure
Data Source
AI summary
A downhole injection system in selective communication with a wellhead assembly and a wellbore, the downhole injection system including a pumping chamber in selective communication with the wellhead assembly, the pumping chamber defining a wellhead pressure portion defining a wellhead pressure inlet in selective communication with the wellhead assembly and a wellhead pressure outlet in selective communication with the wellhead assembly, where the wellhead pressure portion is maintained at a wellhead pressure, and a chemical portion in selective communication with the wellbore, and a movable plate positioned within the pumping chamber, where the chemical portion is separated from the wellhead pressure portion by the movable plate.