Slidable Isolation Sleeve With I-Shaped Seal for Multilateral Wellbores
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Solution Overview
Problem
In multilateral wellbores, the need for drilling or workover rigs during treatment fluid operations, such as hydraulic fracturing, poses challenges in protecting existing equipment and tools, especially as the number of secondary wellbores increases, leading to potential damage and increased costs.
Innovation Solution
A system utilizing an I-shaped seal and a main bore isolation sleeve within an isolation system to isolate secondary wellbores from high-pressure fluids, allowing for stimulation operations without the need for drilling or workover rigs, using I-shaped seals to create a metal-to-metal seal and a straddle stimulation tool to access the secondary wellbores.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If drilling or workover rigs are deployed for treatment fluid operations in multilateral wellbores, then stimulation operations such as hydraulic fracturing can be performed, but existing equipment and tools in the wellbore may be damaged and costs increase
Solution Approach 1:
The patent introduces an isolation sleeve as an intermediary device positioned between the wellbore and the stimulation tool. This isolation sleeve acts as a mediator that blocks high-pressure treatment fluids from damaging existing equipment while still allowing the stimulation operation to proceed through the isolated path, thus resolving the contradiction between performing stimulation operations and protecting existing equipment
Solution Approach 2:
The wellbore is segmented into isolated zones using the isolation sleeve, which divides the wellbore into a protected zone (containing existing equipment) and a treatment zone (where stimulation occurs). This segmentation allows the high-pressure fracturing fluid to be directed away from existing equipment while maintaining access to the formation for stimulation operations
2Productivity
If the number of secondary wellbores increases, then production capacity increases, but the difficulty in protecting existing equipment during treatment operations increases
Solution Approach 1:
The isolation sleeve is designed as a universal device that can be applied to any wellbore configuration, whether single-lateral or multi-lateral. It provides the same protective function across different wellbore types, making the protection system multi-functional and adaptable to increasing numbers of secondary wellbores without requiring different protection strategies for each configuration
Solution Approach 2:
The isolation sleeve serves as a universal intermediary device that can be deployed in any wellbore to provide protection. By using this standardized mediator, the complexity of protecting equipment in multilateral wellbores with multiple secondary wellbores is reduced, as the same solution applies regardless of the specific wellbore configuration
3Object-affected harmful factors
If isolation systems with I-shaped seals are used to isolate secondary wellbores, then existing equipment is protected from high-pressure fluids, but the device complexity increases
Solution Approach 1:
The I-shaped seal uses a flexible sealing element that can deform to conform to the wellbore geometry and create an effective seal. This flexible sealing mechanism provides protection from high-pressure fluids while reducing the complexity compared to rigid sealing systems, as the flexible element adapts to minor variations in wellbore dimensions and positioning
4Ease of manufacture
If hydraulic fracturing operations are performed without rig deployment, then costs are reduced, but the ability to protect existing equipment is compromised
Solution Approach 1:
The isolation sleeve acts as a cost-effective intermediary that provides equipment protection without requiring expensive rig deployment. By blocking the path of high-pressure fluids with this relatively simple device, the system maintains reliability in protecting existing equipment while achieving the cost reduction associated with avoiding full rig deployment
Solution Approach 2:
The isolation sleeve represents a cheaper, simpler alternative to permanent rig-based protection systems. It is a relatively inexpensive device that can be deployed and removed as needed, providing adequate protection during the critical fracturing operation without the high costs and complexity of permanent rig installations
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
Enables hydraulic fracturing and other stimulation operations without damaging existing equipment, reducing the need for rigs and associated costs, while effectively isolating secondary wellbores from primary wellbores, thus enhancing production and reducing wellbore maintenance.
Implementation Method 1
utilizing an I-shaped seal and a main bore isolation sleeve within an isolation system to isolate secondary wellbores from high-pressure fluids, allowing for stimulation operations without the need for drilling or workover rigs, using I-shaped seals to create a metal-to-metal seal
Data Source
AI summary
Provided is a downhole tool. The downhole tool, in one aspect, includes an isolation system for placement at a junction between a first wellbore and a secondary wellbore. In at least one aspect, the isolation system includes an elongated tubular, the elongated tubular having an opening connecting an interior of the elongated tubular and an exterior of the elongated tubular; and a slot located in the elongated tubular, the slot spanning the opening. In at least one aspect, the isolation system further includes an isolation sleeve located within the isolation system, the isolation sleeve configured to slide within the slot to either isolate the interior of the elongated tubular from the exterior of the elongated tubular or provide access between the interior of the elongated tubular and the exterior of the elongated tubular, and an I-shaped seal located in an annulus between the elongated tubular and the isolation sleeve.