ALS revolutionized the industry in 1992 by introducing a leading core stabilization technology called Lithotarge®.
Lithotarge® was developed to provide a suitable option for soft, partly consolidated core.
The close celled structure of the material has been proven through multiple technical papers* to not invade even coarse grained sandstones; in contrast to pore invading stabilisation methods such as gypsum and resin.
In addition to these benefits, the method allows the core to be stabilised in full length barrels, before being cut into 1m / 3ft sections. The reduced handling maximises the opportunity to maintain the cores good condition. An advanced injection technique, the Non-Contact Lithotarge® used in combination with the Half Moon technology, ensures non-invasion of the fractures by the foam.
ALS have 2 key products to ensure core stabilisation by foam injection: Lithotarge® and Lithopink™. Additional key core stabilisation and preservation products are Lithofreeze™ (Core Freezing/Chilling) and Lithoseal™ (Core Preservation).
Excellent shock absorption
Full/Short length and Vertical/Horizontal injections
Simple injection process for minimised core manipulation
Drainage of drilling mud from the core-barrel annulus during Lithotarge® expansion
Proven capacity of fluid preservation over short-term period*
Non-invasive to pores and does not propagate fractures
Core confinement allowing to safely cut open a liner for access
Simple removal of the Lithotarge® in the laboratory
Invisible on CT-scans
Limited amount of solvents in Lithotarge® for better health and safety practices.
* Technical publication: SCA2007/58 - Laboratory assessment of the efficiency of core preservation techniques.
ALS have developed and patented the Lithopink™ stabilisation technique, a coloured version of Lithotarge®. This version facilitates the discrimination of the stabilisation product from the minerals within the fractures during geological description.
Lithopink™ has been tested to ensure the same high quality stabilisation characteristics as for the “standard” Lithotarge™
Non-Contact Lithotarge® method
Alternative to the standard injection process, the Non-Contact Lithotarge® method has been developed to preserve fractures for subsequent laboratory structural analysis; becoming the primary method used throughout North Africa and the Middle East. Used in conjunction with Half Moon liners, layers of plastic films are laid over the core, creating an impermeable barrier between the liner for the foam to expand within, therefore isolating from the Lithotarge® product. A protective cushion is created, which simply lifts off during opening of the Half Moon in the laboratory.
•Non-invasion of the core fractures and matrix by the foam
•High value for fractured reservoir