Downhole Tool Activation via Cyclical Indexing Coordination
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Solution Overview
Problem
Existing methods for controlling multiple downhole tools on the same drill string lack the ability to coordinate their operational states, limiting flexibility and control during drilling operations.
Innovation Solution
A system featuring cyclical indexing mechanisms for each downhole tool, with at least one actuator to coordinate the operational states of multiple tools via a common stimulus, allowing for coordinated cyclical sequences of states to enhance control and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single indexing mechanism is used to control multiple downhole tools, then device complexity is reduced, but the ability to coordinate operational states of multiple tools is lost
Solution Approach 1:
The patent divides the control system into separate indexing mechanisms for each downhole tool, with each mechanism independently controllable. This segmentation allows each tool to be coordinated independently while maintaining overall system manageability, resolving the contradiction between simplicity and coordination capability.
Solution Approach 2:
The patent implements a universal actuator that can control multiple indexing mechanisms through a common stimulus. This multi-functional actuator enables coordinated control of multiple tools without requiring separate control systems for each tool, thereby maintaining device simplicity while achieving operational coordination.
2Adaptability or versatility
If independent control mechanisms are provided for each downhole tool, then coordination flexibility is improved, but device complexity increases
Solution Approach 1:
The patent merges the control functions for multiple downhole tools into a single actuator that responds to a common stimulus. This combining approach allows independent control flexibility while reducing the overall control system structure, as one actuator serves multiple indexing mechanisms rather than requiring separate control systems for each tool.
Solution Approach 2:
The universal actuator is designed to control multiple indexing mechanisms through a common stimulus, enabling coordinated control of multiple tools without proportionally increasing device complexity. The actuator's multi-functional capability allows it to manage multiple tools efficiently.
3Measurement precision
If multiple separate actuation systems are used for each downhole tool, then operational control precision is improved, but loss of time increases
Solution Approach 1:
The patent implements preliminary action by preparing multiple indexing mechanisms to respond to a common stimulus in advance. The systems are configured so that when the actuator is triggered, multiple tools can be coordinated to change operational states simultaneously or in a predetermined sequence, reducing the time required compared to sequential actuation of separate systems.
Solution Approach 2:
The patent ensures continuity of useful action by enabling multiple downhole tools to be actuated in a coordinated continuous manner through a single stimulus. Rather than requiring separate discrete actuation steps for each tool, the system maintains continuous operational flow by coordinating multiple tools simultaneously, thereby reducing total actuation time while preserving control precision.
Data Source
AI summary
An apparatus for use in controlling first and second downhole tools includes a first cyclical indexing mechanism associated with a first downhole tool, and a second cyclical indexing mechanism associated with a second downhole tool, wherein the first indexing mechanism defines at least three sequential indexing positions within a cycle and the second indexing mechanism defines at least two sequential indexing positions within a cycle. The apparatus includes at least one actuator for actuating the first and second indexing mechanisms in response to a common stimulus to cause said first and second indexing mechanisms to advance between respective indexing positions so as to permit co-ordination of the operational states of the associated first and second downhole tools. The apparatus may be used for controlling first and second under reamers or for controlling an under reamer and a corresponding stabilizer.