Downhole Pump Valve Insert Assembly for Low-Drag Ball Control
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Solution Overview
Problem
Existing downhole pump valve assemblies in reciprocating pump systems face challenges in robustness and efficient fluid operation, leading to issues such as fluid drag, ball chatter, and potential gas breakout, which affect the reliability and efficiency of fluid extraction.
Innovation Solution
A valve assembly for downhole pumps is designed with a housing and an insert that features a tapered sidewall and a ball stop, secured through thermal expansion and metallurgical securement, creating a smooth flow transition and reducing fluid drag, while preventing ball chatter and gas breakout.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional valve assembly is used in a downhole pump, then the structure is simpler and easier to manufacture, but fluid drag increases and ball chatter occurs reducing reliability
Solution Approach 1:
The valve assembly is divided into distinct functional components: a body, a separate insert with tapered sidewall, a ball, and a seat. The insert is a discrete component that can be independently manufactured and assembled into the body, allowing each part to be optimized for its specific function while maintaining overall reliability.
Solution Approach 2:
The insert introduces a localized tapered sidewall geometry within the flow passage that differs from the cylindrical body. This localized geometric modification creates a smooth transition zone specifically where fluid flow and ball movement occur, reducing fluid drag and preventing ball chatter without requiring complex modifications to the entire valve assembly structure.
2Loss of energy
If a smooth flow transition is created using a tapered sidewall, then fluid drag is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The tapered sidewall is implemented as a separate insert component rather than being integral to the main body. This segmentation allows the tapered geometry to be manufactured with high precision using specialized processes while the main body can be manufactured using standard, less precise methods. The insert is then assembled into the body, combining precision and simplicity.
Solution Approach 2:
The insert material or surface properties may be modified through thermal processes (thermal expansion and compression mentioned in the code) to achieve the precise tapered fit. By changing physical parameters such as temperature during assembly, the insert can be expanded or contracted to facilitate installation while maintaining precise dimensional tolerances for the tapered sidewall geometry.
3Reliability
If thermal expansion and compression are used to secure the insert, then the engagement is enhanced and reliability improved, but the manufacturing process becomes more complex
Solution Approach 1:
Thermal parameters (temperature) are utilized during the assembly process to control the dimensional state of the insert. Heating causes thermal expansion allowing the insert to be inserted, and subsequent cooling causes thermal contraction creating a tight interference fit. This parameter change approach enables reliable engagement through a controlled, repeatable process.
Solution Approach 2:
The assembly process utilizes the phase transition concept of thermal expansion and contraction. By cycling the temperature, the insert transitions between expanded and contracted states, facilitating easy insertion followed by secure locking in place. This phase transition approach simplifies what would otherwise require complex mechanical fastening methods.
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 solution enhances the robustness and efficiency of fluid operation by reducing fluid drag, minimizing wear, and preventing gas breakout, thereby improving the overall performance and reliability of the downhole pump system.
Implementation Method 1
increasing the engagement of the tapered surface of the insert against the tapered sidewall of the flow passage using thermal expansion from the applied heat
Implementation Method 2
thermal compression from subsequent cooling
Implementation Method 3
brazing a brazing material between the longitudinal surface of the insert and the longitudinal sidewall of the flow passage in response to the applied heat
Data Source
AI summary
A downhole pump used for a reciprocating pump includes a barrel and a plunger. The barrel couples to a tubing string and has a standing valve. The plunger couples to a rod string and has a traveling valve. One or both of the valves can include an assembly comprising a housing and an insert. The insert allowing for flow therethrough has a ball stop and a ball passage. Positioned in the housing, one end of the insert engages a tapered sidewall in the housing. The insert is secured with metallic material metallurgically affixed between the insert and the housing. For example, brazing material can be brazed at the end of the insert to metallurgically affix the insert in the passage. A ball is positioned in the insert, and a seat is positioned adjacent an end of the insert. The assembly is then incorporated into components of the pump.