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Displacement Plugs
Displacement Plugs are used in diamond drilling wireline drill rods and casing for placing cement plugs or casing pack fluid. The plugs are made of natural rubber and are designed to allow positive placement of a casing pack in the casing annulus or a column of cement grout in the hole without dilution by the drilling fluid while pumping.
Displacement Plugs once used are disposable - it is drilled out after the casing pack or cement slurry is pumped into position. The main applications are placing casing pack, plugging back with cement and grouting.
Sizes Available
Product Number | Description |
30667 | Displacement Plug HQ Grind Finish to 2-18/25” x 4-1/8” |
30668 | Displacement Plug HWL |
30669 | Displacement Plug NWL |
30670 | Displacement Plug BWL |
30671 | Displacement Plug AQ |
30672 | Displacement Plug NTW |
30673 | Displacement Plug PQ 4-1/2” |
30675 | Displacement Plug PW 5-1/2” |
30679 | Displacement Plug 7” Top |
30680 | Displacement Plug 8-1/16” Top |
Placing Casing Pack
- A good casing pack job depends on preventing contamination of the casing pack fluid and getting it placed properly. To accomplish this, the following procedure is adopted.
- Casing is run into hole and seated by spinning to bottom
- Casing is pulled back 1” or 2” off bottom to establish full circulation
- A spacer of diesel fuel is introduced into the casing, followed by the casing pack mixture
- An appropriate displacement plug is introduced into the casing
- Water or mud is pumped into the casing and the plug is pumped to the bottom of the hole
- When the plug hits the bottom the pump pressure suddenly rises and signals that the pump should be stopped
- At this point the casing pack has been displaced in the annulus and if volume calculations have been correct, the diesel oil spacer and some diluted casing pack has been circulated out of the hole
- Casing is lowered back on the bottom and the Displacement Plug, which is sitting inside the bottom of the casing, is drilled out
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