Seat Assembly Fluid Barrier for Multi-Stage Well Isolation
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Solution Overview
Problem
Current well stimulation operations, such as hydraulic fracturing, require multiple runs and trips into the well to isolate and treat different zones, which is inefficient and time-consuming.
Innovation Solution
A seat assembly is deployed downhole inside a tubing string to form a fluid barrier by receiving an untethered object, allowing fluid diversion and enabling stimulation operations to be performed in multiple zones without the need for repeated trips, using a conveyance line and tools like expander tools for secure installation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple runs and trips are performed into the well to isolate and treat different zones, then each zone can be properly stimulated, but the operational time and complexity increase significantly
Solution Approach 1:
Fluid barriers (balls or darts) are introduced into the tubing string before the stimulation operation begins. These barriers are positioned at specific depths to create isolation zones in advance, allowing the entire multi-zone stimulation to proceed in a single continuous operation without repeated trips into the well.
Solution Approach 2:
Fluid barriers serve as intermediary elements that temporarily divide the continuous tubing string into isolated segments. These barriers allow fluid to be diverted to specific zones without requiring physical isolation devices or multiple operational runs, thereby reducing time while maintaining effective zone isolation.
2Reliability
If multiple runs and trips are performed into the well to isolate and treat different zones, then each zone can be properly stimulated, but the operational complexity increases
Solution Approach 1:
Fluid barriers are deployed and positioned at desired depths before the stimulation operation begins. This preliminary positioning simplifies the overall operation by eliminating the need for complex multi-run procedures, allowing the stimulation fluid to be pumped continuously through the tubing while automatically diverting to different zones as barriers are encountered.
Solution Approach 2:
The fluid barriers act as simple intermediary elements that automatically direct flow to specific zones without requiring complex control systems or multiple operational interventions. This reduces operational complexity while maintaining reliable zone isolation.
3Productivity
If fluid barriers are introduced to enable single-run multi-zone stimulation, then operational efficiency improves, but the risk of barrier migration or loss increases
Solution Approach 1:
Fluid barriers are introduced and positioned at specific depths before the stimulation operation begins. This preliminary positioning allows operators to verify barrier placement and make adjustments if needed before pumping the stimulation fluid, ensuring reliable zone isolation while maintaining operational efficiency.
Solution Approach 2:
The system incorporates feedback mechanisms to monitor the position and integrity of fluid barriers during the stimulation operation. This allows operators to detect and correct potential migration or loss issues in real-time, maintaining reliable barrier positioning while enabling efficient single-run multi-zone stimulation.
Data Source
AI summary
A technique includes running a seat assembly on a conveyance line into a tubing string, which has previously been installed in a well. The seat assembly includes a seat, which is adapted to receive an untethered object. The technique includes attaching the seat assembly to the string at a location downhole in the well; receiving the object to create a fluid barrier; and diverting fluid using the fluid barrier.