Zonal Frac and Flow Valve Assembly for Reservoir Stimulation
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Solution Overview
Problem
Current methods for completing and stimulating tertiary reservoirs are inefficient in enhancing hydrocarbon fluid retrieval due to limitations in zonal control and proppant placement, leading to reduced production rates and increased operational complexity.
Innovation Solution
A zonal fracturing and flow system comprising a zonal frac and flow valve assembly, frac tip assembly, and resettable shifting assembly that enables precise control over frac sleeve operation, flow path manipulation, and proppant placement, allowing for efficient stimulation and production without over-displacing the formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional completion and stimulation methods are used in tertiary reservoirs, then operational complexity is reduced, but hydrocarbon fluid retrieval efficiency deteriorates
Solution Approach 1:
The system divides the reservoir into multiple zones using zonal isolation sleeves and packers, allowing independent stimulation and production control for each zone. This segmentation enables targeted proppant placement and frac pump pressure application in specific zones, improving overall retrieval efficiency while maintaining manageable operational complexity through modular zone-by-zone treatment
Solution Approach 2:
The system employs dynamically adjustable flow control valves and resettable shifting assemblies that can be repositioned and reconfigured during operation. This dynamic capability allows optimization of frac pump pressure distribution and proppant flow paths in real-time, enhancing retrieval efficiency without permanently increasing operational complexity
Solution Approach 3:
The system introduces intermediary components such as proppant, frac fluid, and zonal isolation packers that mediate between the stimulation equipment and the reservoir formation. These intermediaries enable controlled pressure transmission and proppant placement, improving retrieval efficiency while simplifying the direct interaction between equipment and formation
2Productivity
If zonal control is enhanced for better proppant placement, then hydrocarbon fluid retrieval is improved, but device complexity increases
Solution Approach 1:
The zonal control system is segmented into discrete isolation sleeves and packers that can be individually positioned and activated. Each zone has its own control mechanism, allowing precise proppant placement in specific intervals without requiring complex centralized control, thus improving placement precision while keeping individual zone complexity manageable
Solution Approach 2:
The system performs preliminary zonal isolation and preparation actions before proppant injection. Packers and isolation sleeves are pre-positioned to define treatment zones, and flow control valves are pre-configured. This preliminary action simplifies the subsequent proppant placement operation while ensuring precise zonal control and improved retrieval efficiency
3Productivity
If frac pump pressure is maximized for better fracture creation, then reservoir stimulation is enhanced, but formation displacement increases
Solution Approach 1:
The frac pump pressure is segmented and applied zone-by-zone rather than uniformly across the entire formation. Zonal isolation allows concentrated pressure application in specific intervals, maximizing fracture creation effectiveness in target zones while limiting pressure-induced displacement to localized areas only, reducing overall formation displacement
Solution Approach 2:
The system applies different pressure qualities and magnitudes to different zones based on local formation characteristics. High frac pump pressure is applied only where needed for effective stimulation, while other zones receive lower pressure or no pressure. This local quality approach enhances reservoir stimulation effectiveness while minimizing unnecessary formation displacement in non-target areas
Data Source
AI summary
A technique facilitates completion and stimulation of a reservoir, e.g. a lower tertiary reservoir. Initially a wellbore is drilled into the tertiary reservoir. Following drilling, the wellbore is completed by deploying completion equipment constructed to facilitate stimulation of the tertiary reservoir. The completion equipment may be operated in conjunction with a stimulation system to stimulate the tertiary reservoir and thus to enhance retrieval of hydrocarbon fluids contained within the tertiary reservoir.