Wellbore Interactive-Deflection Mechanism for Multilateral Junctions
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Solution Overview
Problem
Multilateral wellbore systems face challenges in efficiently completing the junction between main and lateral boreholes due to the need for multiple downhole trips, leading to increased time and cost, and the risk of wellbore collapse and pressure loss.
Innovation Solution
An interactive-deflection mechanism using a window sleeve with a selective-deflection profile and a whipstock assembly to deflect junction assembly legs into their respective boreholes, eliminating the need for a separate deflector assembly and enhancing isolation between the main and lateral boreholes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a junction assembly is positioned in the wellbore to provide simultaneous connectivity to the main borehole and lateral borehole while maintaining isolation, then hydraulic sealing and isolation between boreholes is improved, but the number of downhole trips and installation time increases
Solution Approach 1:
The patent combines the deflection mechanism and junction assembly into a single integrated unit. The deflection mechanism is incorporated directly into the junction assembly, allowing both functions (deflection and junction formation) to be performed in one installation operation, thereby reducing the number of downhole trips while maintaining hydraulic sealing reliability
Solution Approach 2:
The deflection mechanism is pre-configured on the junction assembly before deployment. The asymmetric profile is already formed on the junction assembly body, enabling it to be deflected into the correct position within the lateral borehole during a single run, eliminating the need for separate deflection operations
2Reliability
If multiple downhole trips are performed to complete the junction, then proper positioning and isolation can be achieved, but operational cost and time consumption increase
Solution Approach 1:
The patent merges the deflection mechanism and junction assembly into a single integrated unit. The deflection mechanism is incorporated directly into the junction assembly, allowing both functions (deflection and junction formation) to be performed in one installation operation, thereby reducing the number of downhole trips while maintaining hydraulic sealing reliability
Solution Approach 2:
The junction assembly is designed with an asymmetric profile that enables it to self-deflect into the correct position within the lateral borehole upon deployment. The asymmetric geometry causes the assembly to naturally orient and position itself during installation, eliminating the need for complex external deflection operations and multiple trips
3Device complexity
If the junction between main borehole and lateral borehole is not reinforced, then device complexity is reduced, but the wellbore becomes susceptible to collapse at the junction point
Solution Approach 1:
The junction assembly is designed as a segmented structure with multiple functional components including isolation elements, deflection mechanisms, and reinforcement features. This segmentation allows each component to perform its specific function while collectively providing structural support and preventing wellbore collapse at the junction point
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 solution reduces installation time and cost by over half a day, ensuring efficient completion of the wellbore with improved hydraulic sealing and reduced risk of collapse and pressure loss.
Implementation Method 1
a window sleeve having a profile for deflecting (i) a lateral leg of a junction assembly into a lateral borehole of a wellbore and (ii) a mainbore leg of the junction assembly into a through-bore of a whipstock assembly
Data Source
AI summary
A deflection mechanism may include a first incline and a second incline for interacting with legs of a junction assembly to selectively deflect each of the legs in a desired direction in a multilateral wellbore system. The deflection mechanism may include a window assembly for a main borehole of the wellbore and having a selective-deflection profile positioned proximate to an entrance into a lateral borehole extending from the main borehole. One leg of the junction assembly may include a surface profiled corresponding to an angle of the first incline to deflect the leg toward the lateral borehole. Another leg of the junction assembly may include a surface profiled corresponding to an angle of the second incline to deflect the leg toward a whipstock assembly positioned internal to the window assembly.