Unitary Bumper Spring Impact Head for Plunger Lift Systems
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Solution Overview
Problem
Current bumper assemblies in plunger lift systems for wells experience connection failures between the spring and impact head due to the impact of the plunger, leading to potential damage and operational issues.
Innovation Solution
The bumper assembly integrates a unitary mandrel and impact head with a slotted flow cage, where the one-piece mandrel/impact head combination is attached to the flow cage using a latching mechanism held by the tension of a spring, eliminating the need for threads, pins, or welding, and includes a retaining ring for additional locking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If threads, pins, or welding are used to connect the spring to the impact head, then the initial connection strength is sufficient, but the connection fails over time due to plunger impact
Solution Approach 1:
The patent combines the spring and impact head into a single integrated unit, eliminating the connection interface that fails under repeated impact. The spring is formed with an integrated impact head portion that directly contacts the plunger, removing the vulnerable threaded or welded joints between separate components.
Solution Approach 2:
The patent introduces a retaining ring as an intermediary component that secures the spring assembly to the bumper body. This retaining ring provides a reliable mechanical connection that distributes impact forces and prevents the spring-impact head assembly from detaching during plunger impact events.
2Ease of manufacture
If a traditional bumper assembly with separate components is used, then manufacturing and assembly are straightforward, but the connection between spring and impact head fails under impact
Solution Approach 1:
The spring and impact head are merged into a single formed component, which simplifies the overall assembly process by reducing the number of parts to be assembled. The integrated design eliminates the need for separate assembly steps to attach the impact head to the spring, while the retaining ring provides a single securement action to complete the assembly.
3Ease of repair
If the impact head is separately attached to the spring, then replacement of individual components is possible, but the connection is destroyed by plunger impact
Solution Approach 1:
The spring and impact head are combined into a single replaceable unit, which maintains ease of repair at the assembly level while eliminating the weak connection interface. The integrated design ensures that the entire spring-impact head assembly can be replaced as one unit if needed, while preventing connection failure during operation.
Solution Approach 2:
The retaining ring serves as an intermediary that secures the integrated spring-impact head assembly to the bumper body, providing a robust connection that can withstand repeated plunger impacts while still allowing for assembly replacement.
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 design enhances the durability and reliability of the bumper assembly by maintaining the connection between the spring and impact head, preventing damage and ensuring smooth operation of the plunger lift system.
Implementation Method 1
the spring absorbs the energy of the plunger/free piston
Implementation Method 2
The spring is held between the mandrel/impact head and the flow cage. A retaining ring may be placed over the mandrel between the spring and the cage to provide an additional lock to maintain the flow cage and the mandrel in their relative positions.
Implementation Method 3
the plunger pushes the liquid above the plunger to the wellhead as the plunger moves upwards in the well driven by the gas below it
Implementation Method 4
Plunger lift uses a piston, generally referred to as a plunger, which use the flow produced by the well to lift liquid from the well by acting as an interface between the driving flow beneath the plunger and the liquids above it
Data Source
AI summary
A plunger lift system includes a bumper assembly to reduce the impact of the plunger at the bottom of the well and in some circumstances to reconfigure the plunger for the plunger's next ascent. The bumper assembly has a spring, a mandrel, an impact head, and a flow cage. The impact head and mandrel are constructed from a single piece of material thereby removing a joint between the impact head and mandrel. The unitary impact head/mandrel is connected to the flow cage using a first cooperating shoulder at the lower end of the unitary impact head/mandrel and a second cooperating shoulder within the flow cage. The first cooperating shoulder and the second cooperating shoulder are held in place with respect to each other by a force provided by the spring.