Wireline Milling Bottom Hole Assembly Axial Compression
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Solution Overview
Problem
Existing bottom hole assemblies for oil and gas wells face challenges in effectively engaging and cutting objects within the wellbore, particularly when using wireline deployment, as they lack sufficient axial movement and downward force to maintain tool engagement during milling operations.
Innovation Solution
The implementation of an axial compression device within the bottom hole assembly that allows for axial movement below an anchor point, combined with a hydraulically actuated motor and anchor system, enables increased downward force and stable engagement of the milling tool with objects in the wellbore, facilitating effective cutting or abrading operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If bottom hole assembly is deployed on wireline without axial movement capability, then deployment simplicity is maintained, but tool engagement stability deteriorates
Solution Approach 1:
The bottom hole assembly incorporates an axial compression device that enables dynamic axial movement below the anchor point during milling operations. This dynamic capability allows the tool to engage more effectively with objects in the wellbore while maintaining wireline deployment simplicity, resolving the contradiction between ease of operation and reliability.
2Force
If downward force on milling tool is insufficient, then tool engagement is weak, but increasing downward force requires additional axial movement capability
Solution Approach 1:
The axial compression device utilizes hydraulic principles to generate downward force on the milling tool. By using fluid pressure to compress the axial compression device, the system achieves increased downward force without requiring complex mechanical force multiplication mechanisms, thus improving force while limiting complexity increase.
3Productivity
If mill tool rotates at high speed, then cutting efficiency improves, but maintaining tool contact with object becomes difficult
Solution Approach 1:
The axial movement capability allows the mill tool to dynamically adjust its position and maintain contact with the object during high-speed rotation. The downward axial movement compensates for tool wear and engagement variations, ensuring reliable contact while maintaining high cutting efficiency.
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 configuration enhances the ability to engage and remove objects within the wellbore by providing increased downward force and maintaining tool contact, improving the efficiency of milling operations even when deployed on wireline, rather than traditional threaded pipe or coiled tubing.
Implementation Method 1
a hydraulically actuated motor disposed above the mill tool to rotate which, in turn, causes the mill tool to rotate
Implementation Method 2
an axial compression device that permits axial movement of a lower portion of the bottom hole assemblies disposed below an anchor or packer
Implementation Method 3
to abrade or cut away an object disposed in oil and gas wells
Data Source
AI summary
A bottom hole assembly for engaging and removing an object within a wellbore comprises a cutting tool at a lower end. Continued engagement of the cutting tool with the object is facilitated by an axial compression device disposed within the bottom hole assembly below the anchor of the bottom hole assembly. The axial compression device comprises a compressed position and an expanded or extended position. As the object is being cut or abraded, the axial compression device moves from the compressed position toward the expanded position so that a continued downward force is transferred to the object by the bottom hole assembly.