Downhole Injection Tool With Segmented Stings for Even Annulus Sealing
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Solution Overview
Problem
Existing downhole injection systems often fail to distribute sealing material evenly around the circumference of the annular space, leading to leak paths or weak spots along the longitudinal direction within the annulus.
Innovation Solution
A downhole injection tool with at least two stings, each connected to a dedicated treatment fluid cannister, allowing for independent fluid communication and controlled injection through each sting to ensure even distribution of the treatment fluid.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If multiple stings share a common fluid passage and reservoir, then the device complexity is reduced, but the fluid distribution homogeneity deteriorates
Solution Approach 1:
The patent divides the single common fluid passage into multiple separate fluid passages, with each sting having its own dedicated passage and reservoir connection. This segmentation allows independent control of fluid flow to each sting, ensuring homogeneous distribution around the tubular while maintaining manageable device complexity through modular configuration.
2Quantity of substance
If a single reservoir supplies fluid to multiple stings, then the quantity of substance required is reduced, but the fluid distribution homogeneity deteriorates
Solution Approach 1:
The patent segments the single reservoir into multiple separate reservoirs, each supplying fluid to a specific sting. This allows precise control of fluid quantity to each location, ensuring homogeneous distribution while the total fluid volume required remains proportional to the annular space to be treated.
Solution Approach 2:
Each reservoir-sting combination provides localized fluid supply tailored to specific spatial requirements around the tubular. This local quality approach ensures that each sting receives appropriate fluid quantities for its specific position, achieving homogeneous overall distribution.
3Productivity
If punches are forced radially against the casing by pressurized fluid, then the productivity is improved, but the manufacturing precision of sealing material distribution deteriorates
Solution Approach 1:
The patent segments the perforation and injection process into independently controllable operations at each sting location. The punches can be forced radially against the casing with pressurized fluid for high productivity, while the sealing material injection is controlled separately through dedicated fluid passages to each sting, ensuring uniform distribution.
Solution Approach 2:
The patent allows preliminary perforation of the casing at multiple locations using pressurized fluid to force punches radially. Subsequently, sealing material can be injected through the created passages in a controlled manner, ensuring uniform distribution while maintaining high productivity in the overall process.
Data Source
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AI summary
A downhole injection tool for injecting a treatment fluid in a space surrounding a downhole tubular installed in a borehole in the Earth is based on an elongate tool housing extending around a central longitudinal tool axis. At least two stings are provided, each having a fluid channel. At least two treatment fluid cannisters are provided in the downhole injection tool, for holding the treatment fluid that is to be injected. A first cannister of the at least two treatment fluid cannisters is fluidly connected with the exterior of the tool housing via a first sting of the at least two stings, but not via a second sting of the at least two stings. A second cannister of the at least two treatment fluid cannisters is fluidly connected with the exterior of the tool housing via the second sting, but not via the first sting.