CEMENTING AND WEDGING TOP PACKERS (CWTP) are used to pressure grout unstable ground formations and fault zones or with Cementing Wedging Bottom Packers (CWBP) to repair deteriorating uphole fault zones, thereby saving hole below fault and costly re-drill.

Packer has an inlet port on top as illustrated (right) and a non return valve, the top port is opened during setting the packer. Rods are left in position with seal on packer engaged with rod. Grouting can now begin. Upon grouting, the slips retaining tube and cup are ejected opening outlet port at bottom of packer.

Permeability testing and ground stabilization can be done after hole is completed. Rods are run to lowest test location, a Cementing Wedging Top Packer (CWTP) is used to test this location and also grout if required. A Cementing Wedging Bottom Packer (CWBP) is then used below the next section of hole to be tested, a CWTP packer is then used at the top of this section to do test and grout if required, and so on.

No time is lost due to rod trips or waiting for cement to set, the time and cost savings using this method could be considerable as only one rod trip is required for multi testing and grouting.

See also: Sub Set Grouting Packers (SSGP)

Construction: Aluminium and Urethane

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