The basic design of the upper and lower rubber plugs is the same, and the five wiping surfaces provide a firm wiping effect.
The cup-shaped design at the top and bottom of the two plugs ensures that the casing wall is sealed to prevent mixing of cement slurry and displacement fluid. The top plug is seated into the bottom plug and sealed to reduce the possibility of additional slurry replacement and promote good adhesion at the bottom of the casing.
The rub plug is used for putting cement slurry into wellbore to form a strong wellbore seal or "plug" as a remedial cementing technique.
The general plugging process includes selecting the position of the plug and positioning the end of the working string at the bottom of the required plug depth, mix and pump
cement slurry along the working string (drill pipe or tubing)
go into the wellbore and remove the working string from the cement
And allow the cement slurry to harden in the borehole.
When it is pumped to ground, it can withstand the impact while maintaining the ability to be drilled out. The core is completely wrapped in rubber and has a solid base to prevent separation.
Bottom rubber stopper bottom rubber stopper has a cast aluminum core, PDC drillable. When the plug finishes wiping the casing before the cement slurry and is in place during the grounding, the additional pump pressure will break the rubber diaphragm on the top of the core and make the cement slurry continue to reach the destination.
• Seal the dry hole;
• Seal the depletion zone;
• Sealing non-commercial areas or wellbore;
• Temporarily abandon or abandon the well.
•Isolate one pressure zone from another;
• Prevent fluid communication in the formation;
• Stop the loss event;