Frac Window System Isolates Multilateral Wellbores
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In multilateral wellbores, the need for drilling or workover rigs during treatment fluid operations, such as hydraulic fracturing, poses challenges due to the difficulty in protecting existing equipment and the increased complexity with multiple secondary wellbores, which can lead to equipment damage and increased costs.
Innovation Solution
The implementation of a frac window system that includes a tubular with an opening aligned with a secondary wellbore window, annular seals, and an orientation device, allowing for the isolation of secondary wellbores from high-pressure fluids and enabling operations like hydraulic fracturing without the need for rigs, using a straddle stimulation tool and main bore isolation sleeve to manage pressure and isolate specific wellbores.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If drilling or workover rigs are used during treatment fluid operations in multilateral wellbores, then hydraulic fracturing and other stimulation operations can be performed, but the complexity of protecting existing equipment increases and equipment damage risk rises
Solution Approach 1:
The wellbore system is segmented into isolated zones using individual isolation tools for each secondary wellbore. Each isolation tool creates a separate sealed environment, allowing independent stimulation operations without affecting other zones. This segmentation eliminates the need for complex rig-based protection systems while maintaining equipment safety.
Solution Approach 2:
Isolation tools act as intermediary devices between the stimulation equipment and existing wellbore equipment. These tools include seals and barriers that prevent direct contact between high-pressure treatment fluids and sensitive equipment, providing protection without requiring heavy rig infrastructure.
2Productivity
If multiple secondary wellbores are drilled from a first wellbore, then hydrocarbon production is enhanced, but the difficulty in protecting equipment during treatment operations increases
Solution Approach 1:
Each secondary wellbore is equipped with its own isolation tool, creating independent operational zones. This allows simultaneous or sequential stimulation of multiple wellbores without cross-contamination or equipment interference, enabling enhanced productivity while maintaining equipment protection through zone isolation.
Solution Approach 2:
Protection and isolation capabilities are applied locally at each secondary wellbore junction rather than requiring system-wide rig-based protection. Each isolation tool provides tailored protection for its specific zone, allowing high-pressure operations in one area without exposing equipment in other areas to damage risks.
3Ease of manufacture
If hydraulic fracturing is performed after drilling rig removal to reduce costs, then operational expenses decrease, but the ability to protect equipment during high-pressure operations is compromised
Solution Approach 1:
Lightweight isolation tools serve as intermediary protection devices that can be deployed without heavy workover rigs. These tools include packers, seals, and isolation valves that provide necessary equipment protection during high-pressure fracturing operations, enabling cost-effective post-drilling stimulation while maintaining reliability.
Solution Approach 2:
The isolation tools are designed as temporary, cost-effective solutions for the duration of stimulation operations. Rather than requiring expensive, heavy-duty permanent protection systems, these disposable or temporary isolation devices provide adequate protection during high-pressure operations and can be removed or abandoned after use, significantly reducing operational costs.
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 allows for efficient hydraulic fracturing and production operations in multilateral wellbores without the need for drilling or workover rigs, reducing equipment damage and operational costs while enabling independent stimulation of individual wellbores, thereby enhancing hydrocarbon production.
Implementation Method 1
isolating the secondary wellbore from a high pressure treatment fluid
Implementation Method 2
pumping a treatment fluid (e.g., a fracturing fluid) into a wellbore that penetrates a subterranean formation at a sufficient hydraulic pressure to create one or more cracks, or 'fractures,' in the subterranean formation
Data Source
AI summary
Systems and methods for stimulating wells include a frac window system positioned in a first wellbore adjacent a secondary wellbore extending from the first wellbore so that an opening in the frac window system aligns with a window in the first wellbore casing. The frac window system includes an elongated tubular with annular seals along the outer surface above and below the opening in the elongated tubular, and further includes an orientation device carried within the tubular. A main bore isolation sleeve is positioned within the frac window system to seal the opening, isolating the secondary wellbore from pressurized fluid directed farther down the first wellbore. A whipstock seats on the orientation device so that a surface of the whipstock is aligned with the secondary wellbore window of the first wellbore casing. The whipstock guides a straddle stimulation tool into the secondary wellbore from the first wellbore.