Downhole Tool Anchoring System with Pressure Isolation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Downhole tools face challenges in maintaining consistent and reliable operation due to pressure effects from lower wellbore sections, particularly in long horizontal wells, where limited force can be transferred through the tubular, affecting the shifting section's movement and fluid control.
Innovation Solution
A downhole tool anchoring system with a shifting section that is movable relative to the wellbore, featuring a valve system allowing fluid flow from the tubular into the wellbore while blocking flow from the wellbore into the tubular, and a pressure compensator to isolate the shifting section from wellbore pressure, ensuring operation independence from downhole pressures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a downhole tool is used in long horizontal wells with limited force transfer through the tubular, then the tool can be manipulated from the surface, but the shifting section's movement and fluid control are affected by pressure effects from lower wellbore sections
Solution Approach 1:
The downhole tool is divided into distinct functional sections: an anchored section fixed to the wellbore, a shifting section movable relative to the wellbore, and an isolation device positioned between them. This segmentation allows the shifting section to be manipulated independently while the anchored section provides stable reference points, resolving the contradiction between ease of manipulation and movement reliability.
Solution Approach 2:
The isolation device acts as an intermediary element that isolates the shifting section from pressure effects in the lower wellbore section. By positioning the isolation device above the lower wellbore section, it creates a pressure barrier that prevents downward pressure from affecting the shifting section's movement, thereby maintaining reliable operation during surface manipulation.
2Ease of operation
If the shifting section is movable relative to the wellbore to control fluid flow, then fluid placement can be controlled, but the shifting section is affected by wellbore pressure from lower sections
Solution Approach 1:
The isolation device serves as a pressure barrier that isolates the shifting section from harmful pressure effects in the lower wellbore section. This intermediary structure allows the shifting section to maintain its fluid control function while being protected from pressure-induced interference, enabling reliable fluid placement control.
Solution Approach 2:
The system creates different pressure environments for different sections: the upper wellbore section below the isolation device is isolated from lower section pressures, while the lower wellbore section maintains its own pressure regime. This local quality differentiation allows the shifting section to operate independently of downward pressure effects.
3Productivity
If the tubular remains connected to the downhole tool during operations, then fluid can be pumped through the tubular, but force transfer to manipulate the tool is limited
Solution Approach 1:
The tool is segmented into an anchored section and a shifting section, allowing the anchored section to provide stable force reference points while the shifting section can be manipulated. This segmentation enables effective force transfer for manipulation despite the tubular connection, as the anchored section acts as a stable anchor for force application.
Solution Approach 2:
The system utilizes the vertical dimension by positioning the anchored section at a higher elevation than the shifting section. This dimensional arrangement allows force to be applied through the tubular to the anchored section, which then transfers force to the shifting section through mechanical connection, overcoming the limited force transfer problem.
Data Source
AI summary
A technique facilitates the anchoring and use of a downhole tool. The technique may be utilized with operations in which fluid is pumped or otherwise flowed through a tubular to the downhole tool. The operations are performed after the downhole tool has been fixed relative to the wellbore and while the tubular remains connected to the downhole tool. In some operations, the downhole tool is manipulated from the surface via the tubular to control placement of the fluid flowing down through the tubular.