Temperature Compensated Packer Seal for Thermal Contraction
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Solution Overview
Problem
Conventional swellable packers used in downhole wells face challenges in maintaining a consistent seal due to temperature fluctuations, as they thermally contract after steam injection, potentially compromising the seal created by swelling expansion.
Innovation Solution
A temperature compensated element featuring a mandrel with a fluid expansion chamber filled with a thermally expanding fluid, a piston, and a degradable ring that allows the packer to mechanically expand and maintain the seal by increasing in radius when heated, and a backup system to prevent premature extension.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If swellable packers are used to seal the wellbore annulus, then the seal is formed through elastomer expansion, but the seal is compromised when the packer thermally contracts after steam injection
Solution Approach 1:
The patent introduces a temperature-compensated packer that changes its physical parameters (expansion state) in response to temperature variations. The packer expands when exposed to steam heat and maintains or recovers its expanded state even after cooling, thereby compensating for thermal contraction and maintaining seal reliability throughout the steam injection process.
Solution Approach 2:
The packer is designed to preemptively counteract the harmful thermal contraction effect. By incorporating materials or mechanisms that cause the packer to expand in advance or maintain expansion during heating, the system prepares for and neutralizes the subsequent contraction that would otherwise compromise the seal.
2Reliability
If the packer is expanded mechanically to maintain the seal, then the seal consistency is improved, but the device complexity increases
Solution Approach 1:
The temperature-compensated packer utilizes the thermal energy from the steam injection process itself to drive its expansion mechanism. The packer's material properties or internal mechanism automatically respond to temperature changes, eliminating the need for separate external actuation systems and reducing overall device complexity while maintaining seal reliability.
Solution Approach 2:
The patent leverages the natural thermal expansion property of materials to achieve packer expansion. By selecting materials or designing structures that expand when heated by steam, the system converts thermal energy directly into mechanical expansion, simplifying the mechanism compared to purely mechanical actuation systems.
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 ensures a stable and consistent seal by compensating for thermal contraction, maintaining the packer's expanded state even after cooling, and preventing premature extension through a degradable ring and backup mechanisms.
Implementation Method 1
a thermally expanding fluid positioned within the fluid expansion chamber
Implementation Method 2
a degradable ring coupled to the mandrel. The degradable ring may be positioned adjacent to the end ring and adapted to prevent sliding of the end ring before the degradable ring has at least partially dissolved
Data Source
AI summary
A temperature actuated element includes a mandrel, a housing coupled to the mandrel, the housing defining a fluid expansion chamber. A piston is positioned within the fluid expansion chamber. A thermally expanding fluid is positioned within the fluid expansion chamber. An end ring coupled to the piston slides along the mandrel in response to a sliding of the piston. A degradable ring is coupled to the mandrel to prevent movement of the end ring before the degradable ring is dissolved. A packer having a first end and a second end, the first end adapted to slide along the mandrel in response to a sliding of the end ring, and the second end fixedly coupled to the mandrel, so that a sliding of the first end of the packer toward the second end causes the packer element to decrease in length and increase in radius.