Coiled-tubing (CT) intervention services involving casing exits require the use of a whipstock assembly, which consists of a milling assembly, concave, and anchor. The anchor secures the concave, keeping it from traveling downhole while performing the sidetrack. The self-orienting packer and latch system provides the option to retrieve the packer on the same trip as the concave and latch or leave the packer in the well as a datum for a lateral or re-entry. The system also allows for torque transmittal from the milling assembly to the packer’s slips. The packer has an open bore that allows production to flow through the packer when it is left in the well.
The retrievable whipstock packer and latch system is deployed on coiled-tubing or wireline in normal or sour-service applications for wells that require the flexibility to retrieve the packer or drill additional laterals or re-entries using an adjustable, self-orienting whipstock.
The packer and latch whipstock have been used in several lab and function tests. This paper describes the lab tests and results that this self-orienting, trip-saving whipstock packer and latch system has successfully completed.
The selective retrievability of the whipstock packer and latch system provides the option of retrieving the packer on the same trip as the whipstock or leaving it downhole for additional laterals or re-entries. It shears out of the packer after the lateral has been drilled, immediately giving the operator the option to re-engage and retrieve the packer. By reducing the number of trips needed for total tool retrieval, the time needed to begin producing from the lateral, as well as the time required to employ a crew for such tasks, is reduced. The bore of the packer allows for the flow of oil and/or gas from existing lower zones to prevent a loss of production. The 360° adjustability of the latch allows adjustment of the trip-in orientation of the whipstock for a lateral in any direction.