Plunger Adapter Sandwiper for Downhole Pump Reliability
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Solution Overview
Problem
Downhole reciprocating pumps face challenges in efficiently pumping well fluids while preventing sand and particles from entering the pump assembly, leading to potential damage and reduced efficiency due to trapped gases and particle accumulation.
Innovation Solution
A plunger adapter with a sandwiper design, featuring a wear-resistant collar and strategically positioned fluid passages, which directs sand and particles away from the pump assembly and allows for pressure equalization, preventing damage and ensuring smooth operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sandwiper is added to prevent sand entry, then pump reliability improves, but device complexity increases
Solution Approach 1:
The sandwiper is integrated within the plunger adapter structure, with the adapter nested between the plunger and pump barrel. The sandwiper extends from the adapter into the annular space, creating a nested configuration that prevents sand entry without requiring a separate external sandwiper assembly.
Solution Approach 2:
The plunger adapter serves multiple functions: it connects the plunger to the rod string, provides pressure equalization ports for gas venting, and supports the sandwiper for sand prevention. This multi-functionality reduces the need for separate components, thereby improving reliability without proportionally increasing complexity.
2Productivity
If pressure equalization ports are provided, then gas trapping is prevented and pump efficiency improves, but device complexity increases
Solution Approach 1:
The plunger adapter integrates pressure equalization ports directly into its structure, allowing gas to escape from the annular space while the adapter simultaneously performs its primary function of connecting the plunger to the rod string. This eliminates the need for separate gas venting devices.
3Duration of action of stationary object
If wear-resistant coating is applied to collar, then pump duration improves, but manufacturing complexity increases
Solution Approach 1:
The wear-resistant coating is applied specifically to the collar portion of the plunger adapter that contacts the pump barrel, rather than coating the entire adapter. This localized application provides enhanced wear protection at the critical interface while minimizing the complexity and cost of the manufacturing process.
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 plunger adapter effectively prevents sand and particle entry, reduces stress on threaded components, and maintains fluid flow efficiency by venting gases and using a wear-resistant coating to minimize wear, thus enhancing the reliability and performance of downhole pumping operations.
Implementation Method 1
a wear-resistant coating to minimize wear
Implementation Method 2
allows for pressure equalization, preventing damage
Data Source
AI summary
A downhole reciprocating pump assembly for pumping wellfluids from a wellbore has a cylindrical barrel and a plunger disposed within the barrel. A plunger adapter for such pump assembly is configured to allow passage of sand or other particles through the adapter and into a central bore of the plunger so that it does not enter the space between the outer wall of the plunger and inner wall of the barrel of the pump assembly.