Schlumberger

Sliding Sleeves

Overview Library

Communication between the tubing and annulus

Sliding sleeves are assembled to and form part of the tubing string; they are used to establish communication between the tubing string and the casing annulus for single- or multiple-tubing-string completions. Other applications include

  • equalizing pressure between an isolated formation and the tubing string
  • spot acidizing and fracturing
  • killing a well
  • directing the flow from the casing to the tubing in alternate or selective completions. 

Chokes can be optionally installed in the communication ports to adjust the flow rate through them. Sleeves are available with various metallurgies and a selection of landing nipple profiles.

Wireline, CT, or interventionless opening

A shifting tool and wireline or CT are used to shift the sleeve open or closed. Alternatively, an external shroud can be run in the closed position, while the inner sleeve is open. The shroud is sheared hydraulically with annular pressure to establish communication. Heavyweight mud can be displaced from the annulus to the tubing without a slickline or CT trip to open the sleeve. Standard slickline or CT methods are used to close the sleeve.

Selective production in multizone wells

The sliding sleeve separation tool allows flow from the casing and tubing annulus through an open sliding sleeve and up the production tubing, while blanking off the tubing just below the sliding sleeve. This allows alternate production of two zones (isolated from each other by packers) without commingling them. 

When production from an upper zone is not wanted and the sliding sleeve leaks fluid between the tubing and casing annulus when closed, a packoff is used to isolate this zone. The sliding sleeve packoff is attached to a lock, which anchors and seals in the sliding sleeve. The packoff assembly isolates the sliding sleeve ports and prevents fluid migration between the tubing and casing annulus, while allowing restricted flow up the production tubing from below. 

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