Application of SDS surfactant microemulsion for removal of filter cake of oil-based drilling fluid: influence of cosurfa
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Application of SDS surfactant microemulsion for removal of filter cake of oil‑based drilling fluid: influence of cosurfactant Valdic Luiz da Silva1 · Laís Sibaldo Ribeiro2 · Júlio Cezar de Oliveira Freitas1 · Daniel Nobre Nunes da Silva3 · Luciene Santos de Carvalho1 · Marcos Allyson Felipe Rodrigues4 · Alcides de Oliveira Wanderley Neto1 Received: 31 January 2020 / Accepted: 6 July 2020 © The Author(s) 2020
Abstract After drilling oil wells using oil-based drilling fluid, there is the occurrence of a formation of a thin layer of solids adsorbed on the surface, called filter cake, which must be removed to obtain satisfactory well cementation. The present work developed microemulsion systems from sodium dodecyl sulfate, a biodegradable surfactant, with kerosene as oil phase, n-butanol as cosurfactant and distilled water, in order to evaluate its efficiency in removing the filter cake. The results showed that the microemulsion systems composed of inverse and bicontinuous micelles removed 100% of the filter cake regardless of the content of the constituents in the formulation, while the direct micelles only reached 100% with the formulation composed by 10% kerosene and cosurfactant/surfactant ratio = 4. It was observed that the cosurfactant/surfactant ratio is a determining variable for direct micelles to remove 100% of the filter cake and that they are compatible with cement, offering desirable thermal stability and improving the wettability of the rock in water. Keywords Flushing fluid · Microemulsion · SDS · Filter cake Abbreviations DAC Dodecylammonium chloride SDS Sodium dodecyl sulfate LD50 Lethal dose to cause the death of 50% of a group of test animals C/S Cosurfactant/surfactant AP Aqueous phase OP Oil phase RPM Rotation per minute v/v Volume/volume API American Petroleum Institute UCA Ultrasonic cement analyzer TGA Thermogravimetric analysis DTG Differential thermal analysis
* Alcides de Oliveira Wanderley Neto [email protected] 1
Institute of Chemistry, Federal University of Rio Grande Do Norte, Natal, Brazil
2
GP Consulting and Engineering LTDA, Natal, Brazil
3
Faculty of Petroleum Engineering, Federal University of Pará, Salinópolis, Brazil
4
Department of Petroleum Engineering, Federal University of Rio Grande Do Norte, Natal, Brazil
Introduction Oil well drilling activities take place with the help of drilling fluids, of which among several functions, one is the formation of a low permeability film on the rock with the function of reducing the loss of the fluid filtrate (Bageri et al. 2017). This film is called filter cake before the cementing operation begins, and the filter cake must be removed because the cement slurry loses its characteristics when contaminated with the constituents of the filter cake. This mixture causes the cement’s hydration power to decrease, resulting in loss of compressive forces, shear and reduction of the setting time (Aughenbaugh et al. 2014; Li et al. 2015). Removal of filter cake has been a ch
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