Diverter Assembly for Top-Down Cement Squeeze Operations
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Solution Overview
Problem
Current well completion techniques face challenges in effectively cementing wellbores above previously cemented zones, particularly in oil and gas exploration, where additional cement is needed to ensure isolation and regulatory compliance, and existing methods do not allow for efficient top-down squeeze operations without disrupting standard circulation paths.
Innovation Solution
A diverter assembly that allows for the diversion of cement slurry from a work string to the annulus between the wellbore wall and the casing string, enabling a top-down squeeze operation while maintaining the ability to set tools like liner hangers, using a ball-actuated mechanism to control fluid flow and apertures, allowing for both cement diversion and tool setting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If cement slurry is diverted from the work string to the annulus for top-down squeeze operations, then cementing efficiency above previously cemented zones is improved, but the ability to maintain standard circulation paths and set tools is compromised
Solution Approach 1:
The work string is segmented into multiple zones using a diverter assembly with separate flow paths. The diverter assembly includes a first flow path for standard circulation and a second flow path for cement diversion to the annulus, allowing independent control of each path through ball-actuated mechanisms
Solution Approach 2:
The diverter assembly provides multi-functionality by enabling both standard circulation through the work string and top-down squeeze cementing to the annulus through the same tool. The assembly can switch between modes and simultaneously support tool setting operations, eliminating the need for separate equipment
2Adaptability or versatility
If a diverter assembly is added to enable top-down squeeze operations, then cementing capability is improved, but device complexity increases
Solution Approach 1:
The diverter assembly uses a nested structure where an inner sleeve is positioned within an outer sleeve. The inner sleeve contains ball-actuated mechanisms that control flow paths, and the entire assembly integrates within the existing work string configuration, minimizing additional complexity
Solution Approach 2:
The diverter assembly uses ball-actuated mechanisms that automatically control the flow paths based on ball placement. When a ball is introduced, it automatically directs flow to the appropriate path without requiring external control systems, reducing operational complexity
Data Source
AI summary
A downhole tool subassembly has an outer sleeve with a first set of apertures extending from an inner bore of the outer sleeve. An intermediate sleeve positioned is within the outer sleeve and defines an intermediate flow path extending from an inner bore of the intermediate sleeve to a cavity formed between the uphole portion of the outer sleeve and the downhole portion of the intermediate sleeve. An inner sleeve is positioned within the intermediate sleeve and has an external sealing portion that restricts flow across the intermediate flow path when the downhole tool is in a first configuration.