Enables stage cementing operations through use of a hydraulically opened port systemApplications
Stage cementing necessitated by weak formations or well hydrostatics
Stage cementing in deep vertical or highly deviated horizontal wells
Stage cementing with a packer to isolate weak formations below
Features and Benefits
The tool reduces total pumping and hydrostatic pressure on weak zones and prevents lost circulation during cementing.
The tool can be opened without a free-fall opening cone, which enables operations in highly deviated wells.
Shear pins can be adjusted at the rig site, which enables the operator to adjust opening pressures to specific well requirements.
HNBR seals are API RP2-rated for H2S and CO2 environments.
The absence of an opening cone along with PDC-drillable materials accelerates drillout and saves costly rig time.
The Weatherford Eliminator H Model 754 stage tool facilitates cementing at any hole angle through use of a hydraulically opened port system. The tool is PDC-drillable and equipped with removable, field-adjustable shear pins that enable the operator to select opening pressures as required at the wellsite. Hydraulically opened by internal casing pressure, the stage tool eliminates the need for—and cost of—a free-fall plug.
For two-stage cementing operations, the first stage cement slurry is followed by a first-stage shutoff plug. When the first-stage shutoff plug lands on the shutoff baffle below the stage tool, the resulting increase in internal casing pressure hydraulically opens the stage tool and enables circulation. Second-stage cement then passes though the ports and into the annulus above the tool. After the closing plug is released, it wipes cement from the casing ID before bumping on a closing seat that is connected to the unitary sleeve. The resulting pressure increase shifts the closing seat downward, which releases the locking lugs and allows the unitary sleeve to move down across the ports and close the tool. A snap ring locks the sleeve in position and ensures the stage tool remains locked.
For three-stage cementing operations, Weatherford offers a 754TP Model for use as a lower-stage tool with a Model 751E Eliminator M stage tool on top. The 754TP features a smaller-ID closing seat and flexible closing plug that is necessary to close the lower-stage tool after displacement.