Ball Seat Non-Linear Profile for High Pressure Sealing
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Solution Overview
Problem
Conventional isolation devices for frac plugs fail to effectively seal zones at high temperatures and pressures due to material limitations, leading to leaks or failure, as the bearing area between the ball and seat is small, and the ball may deform or extrude through the seat.
Innovation Solution
A frac plug with a ball seat having a non-linear profile that corresponds to the profile of the ball, providing a smaller radial clearance and increased bearing area, allowing the ball to deform slightly and maintain contact, thus enhancing the seal under high pressure and temperature conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional tapered or funnel seating surface is used for the ball seat, then the initial seal is formed, but the bearing area between the seating surface and the ball is small, leading to ball failure under high compressive loads
Solution Approach 1:
The ball seat incorporates a spherical seating surface that matches the curvature of the ball, replacing the conventional tapered or funnel shape. This spherical geometry maximizes the contact bearing area between the ball and seat, distributing compressive loads more effectively and preventing ball material failure under high pressure conditions while maintaining the sealing function.
2Ease of manufacture
If commonly available ball materials are used at high temperatures above 300°F, then the ball can be manufactured, but the mechanical properties degrade, causing the ball to extrude through the seat or crack
Solution Approach 1:
The ball is constructed from composite materials that combine the manufacturability of conventional materials with the high-temperature mechanical properties required for reliable operation above 300°F. This composite construction allows the ball to maintain structural integrity, resist extrusion through the seat, and prevent cracking while remaining manufacturable using standard processes.
3Ease of operation
If a large radial distance is maintained between the inside diameter of the seating surface and the outside diameter of the ball, then the ball can be easily seated, but the bearing area is reduced, increasing the likelihood of ball failure
Solution Approach 1:
The spherical seating surface is designed with a radius that optimizes the balance between ease of seating and bearing area. The curved geometry guides the ball into proper alignment during seating operations while simultaneously maximizing the contact area, eliminating the need for excessive radial clearance and ensuring adequate load distribution.
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 effectively maintains a seal up to 15,000 psi at 400° F, preventing material failure and ensuring a leak-tight pressure seal, even as the mechanical properties of the ball material degrade at high temperatures.
Implementation Method 1
the ball to deform slightly and maintain contact
Data Source
AI summary
An isolation device for a frac plug, the isolation device including a ball seat having a seating surface and a ball configured to contact the seating surface, wherein a profile of the seating surface corresponds to a profile of the ball. A frac plug including a mandrel having an upper end and a lower end, a sealing element disposed around the mandrel, and a ball seat disposed within a central bore of the mandrel, wherein the ball seat includes a seating surface having a non-linear profile. A method of isolating zones of a production formation, the method including setting a frac plug between a first zone and a second zone, disposing a ball within the frac plug, and seating a ball in a ball seat of the frac plug, the ball seat including a seating surface having a profile that substantially corresponds to the profile of the ball.