Wellbore Packer Spacer Mitigates Swabbing Forces
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Solution Overview
Problem
Wellbore isolation devices face limitations in run-in speed due to swabbing, where high velocity fluid flow causes premature actuation and damage to sealing elements, restricting the rate of fluid displacement and increasing operational costs.
Innovation Solution
The design incorporates a spacer with an inverse airfoil configuration to divert fluid flow and mitigate swabbing, along with support shoes that provide axial and radial support, including a jogged leg to prevent extrusion and create a seal, allowing faster run-in speeds and higher circulation rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the run-in speed of the wellbore isolation device is increased, then operational efficiency is improved, but swabbing occurs causing premature actuation and damage to sealing elements
Solution Approach 1:
A swab mitigation device is introduced as an intermediary component between the sealing element and the high-velocity fluid flow. This device includes a body with a flow diversion feature that redirects fluid away from the sealing element, and a swab mitigation element positioned between the sealing element and the diverted flow, thereby protecting the sealing element from swabbing forces while allowing fast run-in speeds
Solution Approach 2:
The device is segmented into distinct functional components: a body, a flow diversion feature, and a swab mitigation element. This segmentation allows each component to perform its specific function independently - the body provides structural support, the flow diversion feature redirects fluid, and the swab mitigation element protects the sealing element from premature actuation
2Productivity
If the volume or rate of fluid displacement is increased, then productivity is improved, but swabbing occurs causing premature actuation of the sealing element
Solution Approach 1:
The swab mitigation element acts as an intermediary that shields the sealing element from high-velocity fluid flow during displacement operations. This allows increased fluid displacement rates to be achieved without causing the sealing element to prematurely actuate, thereby improving productivity while maintaining reliability
Solution Approach 2:
The design converts the harmful effect of high-velocity fluid flow into a beneficial configuration by using the flow diversion feature to redirect the flow in a controlled manner. The swab mitigation element then utilizes this redirected flow path to protect the sealing element, transforming what would be a harmful swabbing force into a controlled flow pattern that maintains sealing element stability
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
This configuration reduces the risk of premature actuation and damage to sealing elements, enabling faster deployment and higher circulation rates without swabbing, thus reducing operational time and costs.
Implementation Method 1
The spacer is configured to create a low-pressure, high velocity zone that mitigates swabbing of the sealing elements
Implementation Method 2
when wellbore fluids flow around the sealing element during run-in, the high velocity fluid flow can generate a pressure drop that urges the sealing element radially outward
Data Source
AI summary
A packer assembly includes an elongate body, an upper shoulder and a lower shoulder each disposed about the elongate body, and an upper sealing element and a lower sealing element each disposed about the elongate body and positioned axially between the upper and lower shoulders. A spacer interposes the upper and lower sealing elements and has an annular body that provides an upper end, a lower end, and a recessed portion extending between the upper and lower ends. A diameter of the annular body at the upper and lower ends is greater than the diameter at the recessed portion.