Dual Isolation Pad Formation Tester In-Situ Switching
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Solution Overview
Problem
Existing formation testing tools face inefficiencies due to wear and tear of isolation pads, requiring frequent replacement and costly rig time for maintenance, which disrupts subterranean operations and affects the integrity of seal performance.
Innovation Solution
A formation tester system with dual isolation pads of different rubber materials and hardness, sharing a common metal base, allows for in-situ pad switching without removing the tool from the wellbore, optimizing sealing performance and reducing maintenance costs by using a backup pad when the active pad is compromised.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single isolation pad is used in formation testing tools, then the device structure remains simple, but the pad requires frequent replacement due to wear and tear, causing loss of time and disruption to subterranean operations
Solution Approach 1:
A second isolation pad is pre-installed on the tool in addition to the first isolation pad. This preliminary preparation ensures that when the first pad wears out or fails, a replacement pad is already in position, allowing for quick in-situ replacement without requiring tool retrieval to surface, thereby minimizing downtime and maintaining operational continuity.
Solution Approach 2:
The dual pad configuration acts as a backup system that cushions against the risk of seal failure. By having a redundant pad ready before the first pad fails, the system prepares in advance for potential seal degradation or failure, ensuring continuous operational capability and reducing the impact of pad-related interruptions.
2Reliability
If isolation pads are frequently replaced to maintain seal integrity, then seal performance is maintained, but rig time and operational efficiency are reduced
Solution Approach 1:
The second isolation pad is pre-positioned on the tool during assembly before deployment. This preliminary arrangement enables immediate replacement of the first pad with the second pad when needed, eliminating the need to retrieve the tool to surface for pad replacement. Consequently, seal integrity is maintained while minimizing disruption to drilling operations and preserving productivity.
Solution Approach 2:
The formation testing tool is designed to perform its own maintenance function by enabling in-situ replacement of isolation pads. The tool carries its own replacement pad and has the capability to swap pads downhole without external intervention, effectively servicing itself and eliminating downtime associated with pad replacement.
3Ease of repair
If the formation testing tool is removed from the wellbore to replace isolation pads, then pad maintenance is achieved, but costly rig time is lost and operational continuity is disrupted
Solution Approach 1:
The tool is equipped with a second isolation pad and the mechanical capability to replace the first pad with the second pad while remaining in the wellbore. This self-service capability allows maintenance to be performed in-situ without retrieving the tool to surface, eliminating costly rig time loss and maintaining operational continuity while still achieving necessary pad replacement.
Solution Approach 2:
The second isolation pad is pre-installed on the tool before deployment to the wellbore. This preliminary preparation enables the tool to perform its own pad replacement operation downhole without requiring retrieval to surface, making repair easy and quick while avoiding the time loss and cost associated with taking the tool out of the wellbore.
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 approach minimizes downtime and resource consumption by enabling pad replacement downhole, maintaining seal integrity, and optimizing sampling operations by selecting the best-suited pad for specific wellbore conditions, thereby enhancing the efficiency and cost-effectiveness of subterranean operations.
Implementation Method 1
the isolation pad 110 substantially seals against the mudcake 106 and around a probe 112
Implementation Method 2
The increase in mud density increases the hydrostatic pressure that helps maintain the integrity of the wellbore and prevents unwanted formation fluids from entering the wellbore
Implementation Method 3
the probe 112, which places an internal cavity 119 in fluid communication with a formation 122. This creates a fluid pathway that allows formation fluid to flow between the formation 122 and the formation tester 100
Implementation Method 4
a linear motion actuator 414 may be coupled to the metal base 408 and operable to move the isolation pad 402, 404 radially
Implementation Method 5
A formation tester system with dual isolation pads of different rubber materials and hardness
Implementation Method 6
The isolation pad 110 substantially seals against the mudcake 106
Data Source
AI summary
Methods and systems for improving operations of a formation tester are disclosed. The formation tester (400) is placed in a wellbore at a location of interest. The formation tester comprises a first isolation pad (402) coupled to a pad carrier (410) and a second isolation pad (404). The first isolation is extendable to substantially seal a probe of the formation tester against a wellbore wall. The first isolation pad is then replaced with the second isolation pad if it is determined that the first isolation pad should be replaced with the second isolation pad.