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SELECTIVE TREATMENT TOOL

OrionT-IS1

The tool is intended to isolate the required interval for its treatment with acid, alkali and other working fluids.
The isolation of the interval is provided by cup seals above and below the target zone. The possible length of isolated interval – from 0.5 meter, which is provided by installation of tubing or pipes between the seals.

Design description
Upper sealing arrangement
Isolates the working interval from above.
Pressure port
Provides commutation of tubing space with working interval. The working fluid is injected into the target interval via the pressure port.
Disengaging section
Is an adjustable unit defining the length of isolated interval. The section is a set of pipe joints screwed together. The tubing may be used instead of pipe joints as well.
Lower sealing gasket
Isolates the working interval from below. Above the lower gasket there are washover ports used for washing the target interval after the treatment.
By-pass
Prevents the swabbing when moving the tool inside the welland provides the fluid circulation through the tool during washover.
Circulation valve
Shuts down and restores the fluid circulation through the tool that provides the fluid flow through the pressure port into the treated well interval and decent washing of space between the seals after the treatment. The valve also contributes to the swabbing effect elimination when moving the tool inside the well. The valve switching is carried out by moving the tubing string up and down.
The circulation valve
Also allows the washover of the well package in case of insufficient bed intake and impossibility to displace the fluid from the tubing into the formation.
Operation
1
1. Lowering
When lowering:
•The circulation valve is open for upward circulation but closed for downward circulation.
•The circulation goes both through the annulus and tubing.
2
2. Alignment
•The tool is lowered to the target interval.
•The tool is aligned in the target interval by geophysical data correlation.
3
3. Injection
•After the tool alignment the interval treatment operations commence.
4
4. Post-treatment washover, relocation and retrieval
• Upon the treatment completion the circulation valve is switched into "washover" position, i.e. the circulation now goes freely upwards and downwards for direct and reverse washover. The tool is washed by feeding the fluid into the annulus.
• After the washover the valve is switched into "transportation" position and the tool is now ready fro relocation into the next target interval or retrieval from the well.
Advantages
Minimum risks - maximum effect
Versatility
- The tools allows conducting single- and multi-stage operations, requiring several steps of treatment in different intervals with no extra trip for tool replacement.
Simplicity
- The treated interval is isolated by simple lowering of the tool into it with further alignment by geophysical data correlation. The sealing is provided by pressure supply into the tubing, thus the mechanical impact on the production string walls is evaded.


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