Indexing Control Mechanism for Repeated Downhole Tool Activation
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Solution Overview
Problem
Existing hydraulic activation mechanisms for downhole tools in drilling operations are either expensive, time-consuming, or limited to one-time use, necessitating the development of a purely mechanical system for repeated activation and deactivation without breaking the tool string or tripping it out of the borehole.
Innovation Solution
An indexing control system using a barrel cam with a cam track and pin mechanism, activated by varying fluid pressures, allows for repeated uphole and downhole movements to control the activation and deactivation of downhole tools like stabilizers or reamers, utilizing mechanical components and fluid pressure changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wireline activation and deactivation methods are used, then downhole tools can be activated and deactivated, but the process is expensive and time-consuming requiring concurrent use of wireline or slickline assemblies
Solution Approach 1:
The patent replaces complex electronic/wireline control systems with a purely mechanical cam and pin mechanism that uses differential hydraulic pressure to automatically activate and deactivate the stabilizer. The cam track geometry mechanically guides the pin through different positions (retracted, intermediate, extended) based on pressure differential, eliminating the need for wireline operations.
Solution Approach 2:
The invention uses differential hydraulic pressure applied to opposite sides of the cam mechanism to control activation and deactivation. By controlling pressure differentials between upper and lower hydraulic circuits, the system can move the stabilizer between retracted and extended positions without wireline intervention.
2Ease of manufacture
If shear pins and ball drop mechanisms are used, then hydraulic activation can be achieved, but they are generally one-time or one-cycle mechanisms that do not typically allow for unlimited repeated activation and deactivation
Solution Approach 1:
The cam mechanism is designed with a reusable cam track that allows the pin to repeatedly traverse through different positions. The cam and pin form a dynamic system that can cycle indefinitely between activation and deactivation states, unlike one-time shear pin mechanisms. The mechanical components are designed for repeated operation without degradation.
Solution Approach 2:
The system enables periodic activation and deactivation of the stabilizer through repeated application of differential hydraulic pressure. The cam track geometry is designed to accommodate multiple cycles of pin traversal, allowing the stabilizer to be extended and retracted repeatedly during drilling operations.
3Adaptability or versatility
If electronic activation systems with MWD and solenoid valves are used, then wide range of activation instructions can be executed, but the systems are highly complex and expensive and limited by reliability and accuracy of MWD and telemetry
Solution Approach 1:
The patent extracts and eliminates all electronic control components (MWD systems, solenoid valves, telemetry equipment) from the activation mechanism, retaining only the essential mechanical cam and pin system. This simplification removes dependencies on complex electronic systems while maintaining sufficient control capability for stabilizer activation.
Solution Approach 2:
The mechanical cam system is self-actuating through differential hydraulic pressure that naturally exists during drilling operations. The system uses the drilling fluid pressure differential to automatically move the pin along the cam track, requiring no external electronic control signals or complex activation sequences.
4Reliability
If conventional hydraulic activation mechanisms are used, then tool activation can be achieved, but they require breaking or tripping the tool string which is time-consuming and costly
Solution Approach 1:
The cam and pin mechanism serves multiple functions within a single integrated assembly: it controls stabilizer extension and retraction, provides mechanical advantage for force multiplication, and enables repeated activation cycles without tool string interruption. This multi-functionality eliminates the need for separate activation procedures that would require tripping the tool.
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
Enables repeated activation and deactivation of downhole tools with enhanced control and speed, reducing operational costs and eliminating the need for complex electronic systems, while maintaining tool integrity.
Implementation Method 1
a first downhole fluid pressure urges the barrel cam in a downhole direction
Implementation Method 2
a second downhole fluid pressure allows the barrel cam to move in an uphole direction
Implementation Method 3
a third downhole fluid pressure urges the barrel cam to move in a downhole direction
Implementation Method 4
a fourth downhole fluid pressure allows the barrel cam to move in an uphole direction
Data Source
AI summary
A downhole tool assembly is configured for repeated and selective hydraulic activation and deactivation. A spring member biases the indexing control section 210 towards a first axial position while drilling fluid pressure in the tool body urges the indexing control section 210 towards other axial positions. Downhole tool activation and deactivation may repeatedly be controlled from the surface by cycling the drilling fluid pressure.