Rotating Control Seal Pressure Relief for Longer Seal Life
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Solution Overview
Problem
Rotary seals in rotating control devices experience premature failure due to excessive pressure differentials, leading to frequent maintenance and high costs in well operations.
Innovation Solution
Incorporation of a pressure relief device with an elastomeric ring in the rotating control device that allows fluid communication between annular areas based on pressure differentials, preventing excessive pressure buildup and seal wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If rotary seals are used in rotating control devices, then sealing effectiveness is improved, but seal life deteriorates due to excessive pressure differentials causing premature failure
Solution Approach 1:
The seal housing is divided into multiple chambers (first chamber, second chamber, third chamber) with separate pressure zones. The elastomeric ring creates additional segmentation within the grooves to isolate pressure differentials. This segmentation allows each seal to operate in a controlled pressure environment, preventing excessive pressure differentials from causing premature failure while maintaining sealing effectiveness.
Solution Approach 2:
The elastomeric ring acts as an intermediary element between the pressure zones. It responds to pressure differentials by deforming and opening communication paths, thereby mediating the pressure distribution across the seals. This intermediary mechanism protects the seals from excessive pressure differentials while maintaining the necessary sealing function.
2Duration of action of stationary object
If pressure relief device with elastomeric ring is added, then seal life is improved by preventing excessive pressure buildup, but device complexity increases
Solution Approach 1:
The elastomeric ring provides self-regulating pressure relief without requiring external control systems. It automatically responds to pressure differentials by deforming and opening communication paths between chambers. This self-service mechanism extends seal life while adding minimal complexity, as the pressure relief function is inherent in the elastomeric material's physical response to pressure.
Solution Approach 2:
The elastomeric ring changes its physical state (deformation, opening/closing of communication paths) in response to pressure parameter changes. This parameter-based response provides adaptive pressure relief that extends seal life without requiring complex mechanical or electronic control systems, thereby limiting the increase in device complexity.
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
Extends the useful life of rotary seals by preventing premature failure, reducing the need for costly maintenance and improving operational efficiency in well operations.
Implementation Method 1
the elastomeric ring is configured to permit fluid communication between the first and second annular areas in response to a pressure differential from the first annular area to the second annular area
Implementation Method 2
an elastomeric ring disposed in the groove and isolating an inner portion of the groove from an outer portion of the groove
Data Source
AI summary
A rotating control device can include a groove formed on a housing, and an elastomeric ring isolating inner and outer portions of the groove, the elastomeric ring permitting fluid communication between the inner and outer portions of the groove in response to a pressure differential from the inner to the outer portion of the groove. A method can include forming a circumferentially extending groove, providing fluid communication between the groove and an annular area isolated between rotary seals, and positioning an elastomeric ring in the groove, the elastomeric ring preventing fluid flow from an exterior of the groove to the annular area, and permitting fluid flow from the annular area to the exterior of the groove. Another rotating control device can include an elastomeric ring in a groove, and a passage in a housing that provides fluid communication between the groove and an annular area between rotary seals.