Method and apparatus for performing a block squeeze cementing job

摘要

A method and apparatus for performing a block squeeze cementing job. The invention provides for perforating the wellbore above and below the desired well formation on a single wireline trip and setting a lower packer on a wireline above the lower perforations. A stinger is positioned in the lower packer, and secondary packer elements on an upper packer are set above the upper perforations. Cementing of the lower perforations is carried out through the lower packer. The secondary packer elements are unset, and the stinger is repositioned adjacent to the upper perforations. Primary packer elements on the upper packer are then set, and the cementing of the upper perforations is carried out through the upper packer and stinger. Setting of the secondary packer elements requires only vertical movement of the tubing string and no rotation. Both cementing steps are carried out on a single tubing trip. The upper packer is retrievable, and the lower packer is of a drillable type. Hydraulic slips may be provided on the upper packer to prevent movement thereof during either cementing operation.