Effect of Mud Acid on Portland-Aqueous Polyurethane Composites to Oil Well Cementing

Abstract:

Mud acid attack of 14 lbm/gal Portland cement composites with 15 % of nonionic aqueous polyurethane was investigated. Plain Portland hardened cement slurries showed the loss of weight around 23 %. The addition of aqueous polyurethane resulted in longer durability, with reduction around 87 % on the loss of weight without influence on the compressive strength or fratographic. The mechanism is related with the decreased porosity and permeability due to the polymeric net formation on the bulk and minor quantities of Ca⁺², preferentially leached to the acidic solution. In this way, Portland-aqueous polyurethane composites are possible solutions to oil well cementing submitted to steam injection and mud acid acidizing operations.

• Periodical: Materials Science Forum (Volumes 730-732)
• Pages: 307-312
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.730-732.307
• Online since: November 2012
• Authors: Ana Cecilia Vieira da Nóbrega, Antonio Eduardo Martinelli, Dulce Maria de Araújo Melo, Marcus Antonio de Freitas Melo, Julio Cezar de Oliveira Freitas, Filipe Silva de Oliveira
• Keywords: Acid Attack, Acidizing, Polyurethane (PU), Portland Cement, Well Cementing

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