Setting Tool Isolation for Precise Liner Hanger Deployment
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Solution Overview
Problem
Conventional hydraulic liner hangers are prone to premature actuation during run-in due to increased fluid circulation, leading to unintended setting and the need for subsequent wellbore operations.
Innovation Solution
A liner string with a liner hanger assembly and deployment assembly, featuring a setting tool that isolates fluid communication between a central bore and the liner hanger actuation assembly until the desired setting depth is reached, using movable sleeves and shearable members to prevent premature actuation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If fluid circulation is increased during run-in to facilitate moving the liner string through deviations, then the liner string can be deployed more effectively, but the liner hanger may be inadvertently actuated above the intended setting location
Solution Approach 1:
The setting tool is segmented into multiple functional zones: a central bore for fluid passage, a chamber for pressure accumulation, and a sleeve mechanism for controlled isolation. This segmentation allows fluid to flow through the tool without directly actuating the hanger until the desired depth is reached.
Solution Approach 2:
The chamber acts as an intermediary between the central bore and the liner hanger actuation assembly. Fluid must first fill this intermediate chamber before it can reach the actuation assembly, creating a pressure buffer that prevents premature actuation during high-flow run-in operations.
2Device complexity
If a conventional hydraulic liner hanger is used without isolation mechanism, then the structure is simpler, but unintended setting occurs during run-in operations
Solution Approach 1:
The sleeve is designed to be movable rather than fixed, transitioning from a closed position (blocking fluid to chamber) to an open position (allowing fluid communication). This dynamic element provides a simple yet effective mechanism for controlling pressure isolation without complex valve systems.
Solution Approach 2:
The chamber is pre-configured to accumulate pressure before it can reach the actuation assembly. This preliminary pressure buildup in the isolated chamber ensures that fluid pressure must reach a specific threshold and depth before hanger actuation can occur, preventing unintended setting during run-in.
3Ease of operation
If the setting tool allows direct fluid communication with the liner hanger actuation assembly, then actuation is simpler, but premature setting occurs before reaching the intended depth
Solution Approach 1:
The design adds a spatial dimension to pressure control by introducing a chamber that fluid must fill before reaching the actuation assembly. This volumetric intermediate space creates a depth-dependent pressure threshold, ensuring actuation only occurs at the intended setting depth while maintaining simple actuation mechanics.
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
Prevents premature actuation of the liner hanger, allowing for precise setting at the intended depth, reducing the risk of collapse and enabling deeper wellbore operations without the need for repeated interventions.
Implementation Method 1
a first sleeve disposed in the central bore and movable from a closed position to an open position
Implementation Method 2
the chamber is isolated from the central bore when the first sleeve is in the closed position
Data Source
Figure 1A
Figure 1B
Figure 1C
AI summary
A liner string includes a liner hanger assembly and a liner hanger deployment assembly. The liner hanger assembly includes a liner hanger. The liner hanger includes a plurality of slips and a liner hanger actuation assembly configured to set the plurality of slips. The liner hanger deployment assembly is disposed within the liner hanger assembly. The liner hanger deployment assembly includes a setting tool configured to selectively allow fluid communication between a central bore of the setting tool and the liner hanger actuation assembly.