Wellbore Machining Device CNC Control and Vibration Damping
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Solution Overview
Problem
Existing down-hole machining devices face inefficiencies and precision issues due to vibrations, requiring frequent tool relocation and tripping to the surface for tool changes, leading to increased machining time and wear.
Innovation Solution
A wellbore machining device equipped with a computer numerical control (CNC) system, utilizing electric servo motors for precise control of machining tools along multiple axes, and featuring a tool changing mechanism and particle collector to minimize vibrations and debris contamination, allowing for precise and efficient machining without the need for frequent tool relocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If prior art down-hole machining devices are used, then machining operations can be performed down-hole, but vibrations occur which reduce efficiency and precision and accelerate wear
Solution Approach 1:
The patent employs active vibration cancellation systems that generate counter-vibrations to neutralize the harmful vibrations produced during machining operations. Sensors detect vibration patterns and actuators produce opposing vibrations to cancel them out, thereby maintaining machining precision and reducing wear without compromising operational reliability.
Solution Approach 2:
The machining device incorporates damping elements and vibration isolation mechanisms installed beforehand to absorb and reduce vibrations before they can affect machining precision. These cushioning elements are integrated into the device structure to prevent vibration transmission to critical components.
2Productivity
If milling operations are performed with prior art devices, then windows can be cut into casing, but the milling operation often has to be interrupted and the tool has to be retracted to surface level
Solution Approach 1:
The patent implements a nested tool configuration where multiple machining tools are arranged concentrically or in compact arrays, allowing them to be transported together through the wellbore without requiring sequential trips to the surface. This nesting arrangement enables continuous machining operations and eliminates time-consuming tool retraction and relocation cycles.
Solution Approach 2:
The machining device is designed to maintain continuous cutting action without interruptions by providing sufficient tool life, efficient cooling systems, and real-time monitoring capabilities that allow the tool to complete the entire machining operation in one continuous pass, eliminating the need for periodic retraction to surface level.
3Adaptability or versatility
If windows are cut with prior art devices, then casing junctions can be created, but the windows are often rough and cause damage to sophisticated equipment
Solution Approach 1:
The patent replaces traditional mechanical milling with advanced machining methods such as laser machining, waterjet cutting, or plasma cutting. These non-contact or minimal-contact methods eliminate mechanical vibrations and tool wear that cause rough surfaces, while still creating precise windows for casing junctions. The substitution of mechanical systems with energy-based systems produces smoother surfaces that do not damage subsequent equipment.
Solution Approach 2:
The machining device incorporates real-time parameter adjustment capabilities that modify cutting speed, feed rate, and depth based on material conditions and tool wear. By dynamically optimizing these parameters, the system maintains consistent cutting quality throughout the operation, producing smooth window surfaces that prevent damage to downstream equipment while preserving the ability to create various junction configurations.
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
The CNC system enhances precision and efficiency by controlling tool movement and cutting parameters, reduces machining time through in-situ tool changes, and effectively manages debris, improving the overall performance and reliability of down-hole machining operations.
Implementation Method 1
the actuators are electric servo motors controlling an actual position of the tool member with respect to a path and/or a sequence of desired positions defined by the control unit
Implementation Method 2
the tool member comprises a sensing device responsive to a reference mark provided at the tubular component, wherein the control unit is responsive to the sensing device to position the tool member relatively to the tubular component
Data Source
AI summary
A wellbore machining device is proposed for machining a tubular component of a wellbore. The device includes a control unit at the surface level of the wellbore and a down-hole tool unit connected to the control unit through a wire line. The tool unit includes an elongated guide member, a tool member movably supported on the guide member with respect to at least three axes of motion and a plurality of actuators controlled by the control unit and adapted to move the tool member with respect to the axes of motion. The tool unit further includes two anchor members each mounted to an axial end of the guide member and adapted to releasably clamp the tool unit to the tubular component. The control unit and the tool unit form a computer numerical control device (CNC device) wherein the actuators are electric servo motors controlling an actual position of the tool member with respect to a path and/or a sequence of desired position defined by the control unit.