migration of fines - Schlumberger Oilfield Glossary

migration of fines - Schlumberger Oilfield Glossary

migration of fines - Schlumberger Oilfield Glossary

1. S. [Well completion]

migration of fines - Schlumberger Oilfield Glossary
migration of fines - Schlumberger Oilfield Glossary

The movement of fine particles of quartz and clay or similar materials in the prospective formation due to drag forces generated during production. The migration of fines may result from unconsolidated or inherently unstable formation or the use of an incompatible treatment fluid which releases fine particles. Unlike the migration of sand that is better stabilized, the material mobilized in the migration of fines must be produced to avoid damage of the neighboring region to the well. The migration of fines causes the particles suspended in the produced fluid to fill the throats of pores near the well, reducing the productivity of the well. The fines may include different materials, such as clays (phyllosilicates of less than 4 microns) and silts (silicates or aluminosilicates whose sizes range from 4 to 64 microns). The kaolinite and illite are the most common migratory clays. The damage generated by the fines is generally located within a radius of 1 to 2 m [3 to 5 ft] from the well, but can also occur at the ends with gravel packing. In the sandstone formations, mixtures of hydrofluoric acid [HF] are used to dissolve the fines. In carbonate formations, the aim is not to dissolve but disperse the fines into the wormholes, so that hydrochloric acid [HCl] is used as the treatment fluid.

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