Pad Plunger With Adjustable Pads for Blockage Navigation
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Solution Overview
Problem
Existing pad plungers for well production are not cost-effective or long-lasting, and they struggle to efficiently reach the bottom of the well and maintain a seal due to issues with diameter adjustment and blockages.
Innovation Solution
A pad plunger design featuring a central mandrel with grooves for spinning descent, canted coil springs for maintaining seal pressure, and adjustable pads for navigating well blockages, made from heat-treated steel components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the plunger diameter is increased to create a better seal, then sealing performance is improved, but the plunger cannot navigate well blockages
Solution Approach 1:
The plunger incorporates adjustable diameter capability through expandable pads or flexible elements that allow the plunger to dynamically change its size. During descent, the plunger maintains a smaller diameter to navigate blockages, then expands to create a sealing contact with the wellbore wall for effective production lifting.
2Ease of manufacture
If conventional plunger designs are used, then manufacturing costs are reduced, but durability and maintenance life are shortened
Solution Approach 1:
The invention applies heat treatment processes to modify the physical and mechanical properties of the plunger material, specifically increasing hardness and wear resistance. This parameter change in material properties extends the operational life and durability of the plunger without fundamentally changing the manufacturing approach.
3Productivity
If the plunger descends quickly to reach the well bottom, then productivity is improved, but the ability to maintain a seal upon arrival is compromised
Solution Approach 1:
The plunger design enables rapid descent through a streamlined profile and reduced drag features, then transitions to a sealed configuration upon reaching the target depth. The adjustable diameter mechanism allows the plunger to maintain sealing contact with the wellbore wall after quick descent, resolving the trade-off between speed and seal reliability.
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
The design enhances the plunger's ability to quickly reach the well bottom and maintain a seal, improving efficiency and durability while reducing maintenance costs.
Implementation Method 1
canted coil springs for maintaining seal pressure
Implementation Method 2
made from heat-treated steel components
Data Source
AI summary
A pad plunger for lifting fluids in a well with a central mandrel attached to a top cap, a bottom cap, at least one capture ring, at least one canted coil spring, and at least one set of pads. The central mandrel is also comprised of at least one set of spring grooves, at least one pad groove disposed between the spring grooves, a central support ring, at least one outer support ring on the end of the central mandrel, and at least one series of outer threads beyond the outer support ring.