Pressure-Activated Hold-Down Tool for Wellbore Positioning
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Solution Overview
Problem
Existing wellbore servicing device hold-down systems often become stuck due to sand, dirt, and other matter, fail to provide centralizing and selective radial placement, and require additional wellbore service procedures for activation and deactivation.
Innovation Solution
A pressure-activated hold-down tool that changes curvature in response to fluid pressure changes, engaging with the wellbore features to prevent longitudinal movement and provide centralizing or decentralizing functionality without needing special wellbore servicing procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If mechanical slips and/or wedges are used to provide robust holding strength, then holding force is improved, but the system becomes susceptible to becoming stuck due to sand, dirt, and other matter
Solution Approach 1:
The patent replaces traditional mechanical slips and wedges with a pressure-activated hold-down system that uses fluid pressure to inflate expandable elements (such as balloons or bellows). This substitution eliminates direct mechanical contact between moving parts and wellbore debris, preventing the system from becoming stuck while maintaining robust holding force through pneumatic expansion against the wellbore wall.
Solution Approach 2:
The patent employs pneumatic principles by using fluid pressure to activate and expand the hold-down elements. The expandable elements are inflated through fluid pathways from a workstring, allowing the system to engage with the wellbore wall without mechanical linkages that could be blocked by sand, dirt, or other matter. This pneumatic mechanism provides reliable holding force while resisting contamination.
2Ease of operation
If traditional hold-down systems are used, then holding function is provided, but additional wellbore service procedures are required for activation and deactivation
Solution Approach 1:
The pressure-activated hold-down system integrates multiple functions into a single mechanism: the same fluid pressure pathway that delivers operational fluid to the wellbore servicing device also activates the hold-down elements. The workstring serves dual purposes as both the service delivery conduit and the activation mechanism, eliminating the need for separate activation procedures and reducing overall service time.
Solution Approach 2:
The system uses the existing operational fluid pressure from the wellbore servicing operation itself to activate the hold-down mechanism. No separate activation system or additional service procedures are needed—the operational pressure automatically engages the hold-down elements when fluid is pumped through the workstring, and depressurization automatically disengages them when operations cease.
3Stability of the object's composition
If hold-down systems provide sufficient holding forces, then position stability is improved, but centralizing and selective radial placement functionality is not provided
Solution Approach 1:
The patent employs multiple expandable hold-down elements distributed around the circumference of the wellbore. By selectively inflating specific elements or adjusting their expansion differentially, the system can provide not only holding force but also centralizing action (by expanding elements symmetrically on opposite sides) or selective radial placement (by expanding specific elements to push the servicing device to a desired radial position). This local control of expansion provides both stability and adaptability.
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
Effectively maintains the position of wellbore servicing devices with reduced risk of lodging, providing both holding and centralizing functions without additional service procedures, and allowing for selective placement and easy disengagement.
Implementation Method 1
the pressure actuated elements are configured to cooperate to selectively lie increasingly deviated from the longitudinal axis in response to a change in pressure applied to the pressure activated hold-down tool
Data Source
AI summary
A method of maintaining a location of a wellbore servicing device includes connecting a pressure activated hold-down tool (PAHT) to the wellbore servicing device, delivering the wellbore servicing device and the PAHT into a wellbore, selectively increasing a curvature of the PAHT in response to a change in a fluid pressure, and engaging the PAHT with a feature of a wellbore to prevent longitudinal movement of the wellbore servicing device. A PAHT has pressure actuated elements that selectively provide an unactuated state in which the PAHT lies substantially along a longitudinal axis and the pressure actuated elements selectively lie increasingly deviated from the longitudinal axis in response to a change in pressure applied to the PAHT. At least one of the pressure actuated elements has a tooth configured for selective resistive engagement with a feature of the wellbore.