Downhole Isolation Tool With Resettable Seal for Instant Zone Communication
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Solution Overview
Problem
Conventional frac plugs and perforation methods in well operations face challenges such as time-consuming fluid pumping for contingency, unreliable rupture discs, and delayed communication establishment due to dissolvable balls, which hinder efficient zonal isolation and pressure testing.
Innovation Solution
A downhole tool with a plunger and plug system that utilizes shear pins to form a resettable seal, allowing bi-directional fluid flow and instant communication between zones, eliminating the need for ball dropping and enabling immediate pressure testing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a ball is dropped from the surface to isolate the frac plug, then contingency isolation is ensured, but time and fluid are consumed for pumping the ball from the surface
Solution Approach 1:
The ball trap mechanism is pre-installed in the running tool assembly before downhole deployment. This preliminary configuration ensures that the ball is already positioned and ready to provide immediate contingency isolation without requiring subsequent pumping operations from the surface, thus resolving the time consumption issue while maintaining reliability
2Reliability
If a ball is run on the seat with the frac plug, then immediate isolation is available, but the well must flow back which is challenging if the well doesn't possess enough energy
Solution Approach 1:
The ball trap acts as an intermediary mechanism that decouples the ball positioning function from the well flow-back requirement. The trap provides a mechanical interface that allows the ball to be retained or released independently of well energy, enabling immediate isolation capability without requiring the well to possess sufficient energy for flow-back operations
3Adaptability or versatility
If rupture discs are used to establish communication across zones, then pressure differential control is achieved, but each stage requires different rupture disc values and premature breaking may occur
Solution Approach 1:
The ball trap mechanism serves as a universal solution that can be applied across multiple stages and zones without requiring stage-specific configuration. A single ball trap design can accommodate different pressure differentials and stage requirements, eliminating the need for multiple rupture disc specifications and reducing device complexity while maintaining adaptability
4Reliability
If dissolvable balls are used to establish communication, then zonal isolation is achieved, but waiting periods are required for dissolution
Solution Approach 1:
The ball trap mechanism enables the system to self-regulate communication and isolation without requiring external intervention or waiting periods. The mechanical trap allows immediate establishment of zonal isolation and can be reset or repositioned on-demand, eliminating the time-consuming dissolution process while maintaining reliable isolation
Data Source
AI summary
A downhole tool configured for selective fluid communication and isolation within a wellbore. The tool includes a mandrel, housing, plug. In a first mode, the tool functions as a resettable check valve to isolate a first area from a second area. In a second mode, the tool permits bidirectional flow while maintaining a one-way seal during transition. The plug and plunger are temporarily coupled by a shearable mechanism to allow repeated isolation and communication cycles, and subsequently, permanent communication between the areas. The system provides immediate casing-testing capability and eliminates reliance on dissolvable balls, allowing instant re-establishment of communication with the toe sleeve following pressure testing.