PCD Insert Mounting With Expansion Anchor for Abrasive Valve Wear
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Choke valves used in drilling and production systems experience reduced performance due to wear and tear from abrasive materials, particularly when the needle and seat are formed from non-superhard materials, leading to altered flow characteristics and operational inefficiencies.
Innovation Solution
A polycrystalline diamond (PCD) insert is secured to a base portion using an expansion anchor, where the expansion anchor is inserted through a bore in the PCD insert and expanded to create a secure interlocked connection, minimizing wear and enhancing the longevity of the needle and seat components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the needle and seat are formed from non-superhard materials, then the manufacturing cost is reduced and ease of manufacture is improved, but wear from abrasive materials increases and operational lifetime is reduced
Solution Approach 1:
The needle is constructed as a composite structure with a base portion made from non-superhard material (such as steel) and a tip portion made from superhard material (polycrystalline diamond). This composite construction allows the majority of the needle to be made from easily manufactured material while the tip portion provides wear resistance against abrasive materials in the fluid stream.
2Reliability
If the needle and seat are formed from superhard materials, then wear resistance is improved and operational lifetime is increased, but manufacturing complexity increases and ease of manufacture is reduced
Solution Approach 1:
Instead of making the entire needle from superhard material, the superhard material (polycrystalline diamond) is applied only to the tip portion where wear resistance is most critical. The base portion remains made from conventional material that is easier to manufacture and machine. This local application of superhard material provides wear resistance exactly where needed while maintaining manufacturing efficiency.
3Device complexity
If the needle is secured to the base portion using traditional methods, then the assembly process is simple, but the connection strength is insufficient to withstand abrasive wear forces
Solution Approach 1:
The needle is divided into two distinct segments: a base portion made from non-superhard material and a tip portion made from superhard material. These segments are joined together through a bores in the base portion and secured with an expansion anchor. This segmentation allows each portion to be optimized for its specific function while being securely connected to handle the abrasive wear forces.
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 secure connection using an expansion anchor significantly increases the operational lifetime of the needle and seat by reducing wear from abrasive materials, maintaining effective flow control in challenging environments.
Implementation Method 1
The expansion anchor is expanded until at least a portion of the expansion anchor engages an inner wall of the bore
Data Source
AI summary
A retention mechanism for a PCD insert includes an expansion bolt inserted through a mounting element into a bore of the PCD insert. The bore of the PCD insert has an opening diameter that is greater than a terminal diameter at a terminal end of the bore. The expansion anchor is expanded in the bore, and an interference of the expanded expansion bolt with the body of the PCD insert secures the PCD insert to the mounting element.