Downhole Eccentric Reamer Tool Borehole Quality
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Solution Overview
Problem
Current drilling methods require frequent trips of the drillstring to change or add tools, leading to increased time, effort, and expense, and often result in borehole irregularities like ledges and sharp corners that require additional reaming, which complicates the drilling process.
Innovation Solution
A reaming tool with a tubular body and eccentric blades that can pass through a smaller diameter than the reamed diameter, allowing it to be rotated within a casing without damaging it and expanding the borehole to a larger diameter than the casing, reducing the need for additional trips and improving borehole quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a reamer is used to remove ledges and sharp corners to improve borehole quality, then borehole quality is improved, but the device complexity increases and additional trips are required
Solution Approach 1:
The patent combines the drilling function and reaming function into a single integrated tool assembly. The drill bit drills the borehole while the reamer, positioned adjacent to the drill bit, simultaneously removes ledges and sharp corners. This merging eliminates the need for separate reaming operations and additional trips, reducing operational complexity while maintaining high borehole quality.
Solution Approach 2:
The reaming tool is designed with multi-functionality, serving both as a drilling support device and a borehole finishing device. The tool can pass through the casing in a non-rotating state to avoid damage, then rotate to perform reaming operations. This universal design allows a single tool to handle multiple operations that would traditionally require separate specialized tools.
2Adaptability or versatility
If the drillstring is tripped frequently to change or add tools, then tool requirements are met, but the loss of time increases
Solution Approach 1:
The drill bit and reamer are combined into a single assembled tool that can be deployed together in one trip. The reamer is positioned in axial alignment with the drill bit and secured to the drillstring, creating an integrated drilling-reaming system. This eliminates the need for separate trips to add a reamer after drilling, significantly reducing time loss while maintaining the adaptability to meet both drilling and reaming requirements.
3Manufacturing precision
If the reaming tool is rotated within the casing during passage, then the reaming function is enabled, but the casing may be damaged
Solution Approach 1:
The reaming tool is designed with dynamic operational states. During passage through the casing, the tool remains in a non-rotating state to avoid damaging the casing. After passing through the casing and engaging the formation, the tool transitions to a rotating state to perform reaming operations. This dynamic state change allows the tool to adapt its rotational behavior based on the operational phase, preventing casing damage while enabling the reaming function.
Solution Approach 2:
The tool is designed to pass through the casing in a controlled non-rotating state before performing reaming operations. This preliminary action of navigating the casing without rotation prevents damage to the casing, and only after successfully passing through does the tool begin rotation to execute the reaming function on the formation.
Data Source
AI summary
Reaming tools for reaming a borehole and related systems and methods are described herein. In an embodiment, the tool includes a body having a central axis, and a plurality of blades. Each of the plurality of blades includes an uphole section that extends in a first helical direction, a downhole section that extends in a second helical direction that is opposite the first helical direction, and an arcuate central section that continuously extends from the uphole section to the downhole section. The plurality of blades are eccentric about the central axis such that the reaming tool is configured to pass axially through a first diameter and is configured to ream a borehole to a second diameter that is greater than the first diameter when the tool is rotated about the central axis in a cutting direction.