Schlumberger

Product Sheet: SAFE‐LINK Completion Fluid Loss Control Agent

Date: 7/11/2016

The SAFE-LINK completion fluid loss control agent comprises a chemically modified, crosslinked cellulose polymer that is primarily used to control loss of clear-brine fluid to the formation during cased hole completion or workover operations.

The agent controls fluid loss by applying a highly viscous material across the formation face, virtually stopping the flow of brine into the formation. The SAFE-LINK agent functions through a crosslinked polymer network that is held in place on the formation face. The effectiveness of this product is not dependent on bridging solids or on viscous drag within the formation matrix.

The SAFE-LINK agent works in nonzinc halide brines—such as calcium chloride, calcium bromide, sodium chloride, seawater, sodium bromide, and potassium chloride—ranging from 8.6 to 15.1 lbm/galUS [1,030 to 1,809 kg/m3] to control loss of brine to the formation. Generally, the SAFE-LINK agent is stable to 250 degF [121 degC] for at least 48 h of exposure time. Because of the SAFE-LINK agent’s crosslinking mechanism, differential pressure greater than 2,000 psi [13.79 MPa] is not advisable.

Three SAFE-LINK agent products are available: SAFE-LINK 110 agent, SAFE-LINK 135 agent, and SAFE-LINK 140 agent. Active components consist of crosslinked hydroxyethyl cellulose (HEC) polymer in approximately 11-, 13.5-, and 14-lbm/galUS [1,318-, 1,618-, and 1,678-kg/m3] brines, respectively. The appropriate SAFE-LINK agent should be chosen for the desired pill density.

Based on recommended treatment levels and use, the fluid loss to moderately permeable formations (100–1,000 mD) can be eliminated.

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