Sidetrack Window Cutting Tool for Casing Extraction
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Solution Overview
Problem
Current methods for drilling sidetrack wellbores are inefficient, requiring multiple trips and causing damage to equipment due to milling operations, and lack precision in creating windows in casings.
Innovation Solution
A sidetrack assembly with a cutting tool and whipstock that allows for cutting and removing a portion of the casing in one trip, using a movable cutter and mechanical fasteners, and a whipstock that can be set and removed with pressure pulses, enabling precise window creation and sidetrack drilling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional milling operations are used to create windows in casing, then the casing can be opened for sidetrack drilling, but equipment damage occurs and multiple cleaning runs are required
Solution Approach 1:
The invention extracts the problematic milling operation and replaces it with a cutting tool that removes the casing window section entirely. The cutting tool cuts through the casing and extracts the window section as a separate piece, eliminating the harmful milling process that causes equipment damage and requires multiple cleaning runs.
Solution Approach 2:
The invention replaces the traditional mechanical milling system with a cutting tool system that uses a different mechanical approach - cutting and extraction rather than milling. This substitution eliminates the harmful effects of milling while achieving the same functional goal of creating an opening for sidetrack drilling.
2Reliability
If multiple trips are made for sidetrack operations, then thorough cleaning and preparation can be achieved, but the duration of operations increases
Solution Approach 1:
The invention merges multiple separate operations (cutting, window creation, and cleaning) into a single integrated operation. The cutting tool performs all necessary functions in one trip, combining the benefits of thorough preparation with reduced operation time by eliminating the need for multiple separate trips.
Solution Approach 2:
The invention maintains continuous useful action throughout the operation. The cutting tool continuously cuts through the casing and removes the window section in one uninterrupted sequence, eliminating the interruptions and idle time associated with multiple trips and cleaning operations.
3Ease of manufacture
If conventional cutting methods are used, then casing can be cut, but precision in window creation is insufficient
Solution Approach 1:
The cutting tool is configured to copy or replicate a predetermined window geometry. The tool follows a programmed path or template that ensures precise reproduction of the desired window shape and size, achieving high manufacturing precision while maintaining ease of cutting operation.
Solution Approach 2:
The invention controls cutting parameters (speed, depth, angle, feed rate) to achieve precise window creation. By optimizing and controlling these parameters, the system achieves both ease of cutting and high precision in window geometry, resolving the contradiction between cutting capability and precision.
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 method reduces the duration of sidetracking operations, minimizes equipment damage, increases accuracy, and eliminates the need for multiple cleaning runs by cutting and removing the casing in a single trip, allowing for more efficient and precise sidetrack wellbore drilling.
Implementation Method 1
actuating the cutter, cutting along a cut profile of the casing to cut free a portion of the casing at the target zone
Implementation Method 2
fluidly isolating the target zone from a section of the wellbore downhole of the whipstock includes actuating, by pressure pulses through the wellbore string, a packer of the whipstock
Implementation Method 3
The turbine is in fluid communication with the wellbore string and configured to rotate under fluidic pressure. The power generator is configured to transmit, to the electric motor or to a battery pack configured to power the electric motor, electricity generated by rotation of the turbine
Implementation Method 4
The turbine is in fluid communication with the wellbore string and configured to rotate under fluidic pressure
Implementation Method 5
activating, by pressure pulses, the key profile, retracting the key profile and disengaging the cutting tool from the whipstock
Implementation Method 6
actuating, by pressure pulses, the jar assembly to loosen or remove the portion of the casing from cement retaining the portion of the casing to the wall of the wellbore
Data Source
AI summary
A sidetracking method includes lowering a sidetrack assembly to a target zone of a wellbore comprising a casing. The sidetrack assembly comprising a cutting tool coupled to a wellbore string and a whipstock releasably coupled to the cutting tool. The method includes setting the whipstock on a wall of the wellbore, pulling the wellbore string, decoupling the cutting tool from the whipstock, actuating the cutter, cutting along a cut profile of the casing to cut free a portion of the casing at the target zone, actuating the mechanical fasteners, fastening the portion of the casing to the cutting tool, pulling the wellbore string, detaching the portion of the casing from the wall of the wellbore, drilling, with a directional drill string a sidetrack wellbore extending from the window to a downhole location of the sidetrack wellbore, and removing the whipstock from the wellbore.