Schlumberger

Miscellaneous Completion Accessories

Overview Library

Address a range of downhole issues

Specialized accessories address a range of downhole issues.

Retrieve complex completion string despite stuck packer

Installed above a multiport packer, the Schlumberger Line Management System (LMS) ensures the retrieval of an intelligent completion string when the packer cannot be retrieved. It provides a point at which the tubing can be reliably parted, together with the control lines on the exterior, using explosive jet cutters. The LMS assembly and the control lines above the packer can then be retrieved, leaving behind a clean fishing neck.

Access producing zones even when flow control valves stick closed

Our perforating contingency sub (PCS) is made up to the tubing string and located just below the annular flow control valve of each zone. If a valve becomes stuck in the closed position, the sub provides a target for locating a tubing cutter so that the inner mandrel can be cut without damaging the external control lines that operate the lower valves. The cut will allow communication between the annulus and the tubing so that the zone can continue producing. The PCS can be perforated multiple times to increase flow rate.

Enable safe reentry of slickline tools into the tubing

Certain tools, such as tubing end locators or sample bailers, are designed to be run out of the end of the tubing into the casing to perform their tasks. Attached to the bottom end of the production string, our wireline reentry guide—with its internal bevel—guides the wireline or slickline tool back into the tubing.

Resist erosive wear from fluid blasts or turbulence

Flow couplings are thick-walled tubular components located adjacent to changes in tubing ID. They are better equipped than production tubing to withstand the erosional turbulence caused by ID changes. Blast joints are similarly constructed and placed across from perforations to resist the erosive blast of formation fluid, which often carries abrasive solid particles.

Enhance accuracy and reliability of downhole production data

Perforated production tubes are usually installed between the bottom two nipples of a completion. Downhole recording devices can then be installed in the lower nipple profile to acquire flowing pressure and temperature measurements. The perforated production tube (also called a ported pup joint) allows unrestricted flow of oil or gas, enhancing the accuracy and reliability of acquired downhole production data, which would otherwise be distorted due to flow restrictions in the locking device that suspends pressure and temperature gauges.

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