Improvement in filtration properties of water-based drilling fluid by nanocarboxymethyl cellulose/polystyrene core–shell nanocomposite

Journal of Petroleum Exploration and Production Technology, Jan 2018

Since almost all drilling problems directly or indirectly relate to drilling fluid, improvement in drilling fluid significantly enhances drilling operations. Drilling fluid contains base fluid, suspended solid particles and chemicals. Recently, nanoparticles have been widely recommended for improvement in drilling fluid properties. The main purpose of this study was to improve the rheological and filtration properties of water-based drilling fluid through adding new additive carboxyl methyl cellulose (CMC)/polystyrene core–shell nanocomposite. It compares filtration and rheological behavior of CMC, nanoCMC and core–shell nanocomposite. The core–shell nanocomposite was synthesized by miniemulsion polymerization method, and nanoCMC and core–shell nanocomposite were characterized by scanning electron microscope, transmission electron microscopy, particle size analyzer and thermogravimetric analysis. Fluid loss, mud cake thickness, viscosity, weight and pH of drilling fluid with core–shell nanocomposite additive were compared with conventional CMC (bulk CMC) and nanoCMC particles. Results showed a significant decrease in mud cake thickness and fluid loss when the core–shell nanocomposite was used, as compared with conventional CMC and nanoCMC. Viscosity of three additives has same trend with insignificant change while less yield point is obtained for drilling fluid containing core–shell nanocomposites. Mud weight and pH were almost the same for all three additives. Thus, the core–shell nanocomposite can be an alternative additive to control mud cake thickness and fluid loss while maintaining other main properties in an acceptable range.

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Improvement in filtration properties of water-based drilling fluid by nanocarboxymethyl cellulose/polystyrene core–shell nanocomposite

Journal of Petroleum Exploration and Production Technology https://doi.org/10.1007/s13202 Improvement in filtration properties of water‑based drilling fluid by nanocarboxymethyl cellulose/polystyrene core-shell nanocomposite Rahmatallah Saboori 0 1 2 4 Samad Sabbaghi 0 1 2 4 Azim Kalantariasl 0 1 2 4 Dariush Mowla 0 1 2 4 0 Nanotechnology Research Institute, Shiraz University , Shiraz , Iran 1 Nano Chemical Engineering Department, Shiraz University , Shiraz , Iran 2 School of Chemical and Petroleum Engineering, Shiraz University , Shiraz , Iran 3 Samad Sabbaghi 4 EOR/IOR Research Institute, Shiraz University , Shiraz , Iran Since almost all drilling problems directly or indirectly relate to drilling fluid, improvement in drilling fluid significantly enhances drilling operations. Drilling fluid contains base fluid, suspended solid particles and chemicals. Recently, nanoparticles have been widely recommended for improvement in drilling fluid properties. The main purpose of this study was to improve the rheological and filtration properties of water-based drilling fluid through adding new additive carboxyl methyl cellulose (CMC)/polystyrene core-shell nanocomposite. It compares filtration and rheological behavior of CMC, nanoCMC and core-shell nanocomposite. The core-shell nanocomposite was synthesized by miniemulsion polymerization method, and nanoCMC and core-shell nanocomposite were characterized by scanning electron microscope, transmission electron microscopy, particle size analyzer and thermogravimetric analysis. Fluid loss, mud cake thickness, viscosity, weight and pH of drilling fluid with core-shell nanocomposite additive were compared with conventional CMC (bulk CMC) and nanoCMC particles. Results showed a significant decrease in mud cake thickness and fluid loss when the core-shell nanocomposite was used, as compared with conventional CMC and nanoCMC. Viscosity of three additives has same trend with insignificant change while less yield point is obtained for drilling fluid containing core-shell nanocomposites. Mud weight and pH were almost the same for all three additives. Thus, the core-shell nanocomposite can be an alternative additive to control mud cake thickness and fluid loss while maintaining other main properties in an acceptable range. Drilling fluid; Core-shell nanocomposite; CMC nanoparticle; Polystyrene; Filtration; Rheology Introduction Drilling fluid has many key functions in drilling operations, and almost all problems encountered in drilling operations are directly or indirectly related to drilling fluid properties (Adams 1985; Chilingarian and Vorabutr 1983; Patel 1998; Plank and Gossen 1991) . Optimum selection of drilling fluid is a key factor in minimizing drilling time and cost (Mokhtari and Ozbayoglu 2010; ‎Salih et al. 2016) . Due to cost, environmental issues, water-based drilling fluid is more preferable and attractive option than oil and synthetic fluids for drilling oil and gas wells in sensitive areas where oil base fluids are not desired. Development of high performance and more environmental friendly water base fluids are desirable (Salih et al. 2016) . Water-based drilling fluid mainly consists of water as base fluid, inert and reactive solids as additives which still has many disadvantages including shale instability, formation damage, poor cake properties and high fluid loss; recently, nanowater-based fluid has been proposed by several researchers for overcoming related issues in drilling fluid such as reducing tor and drag, controlling fluid loss, minimizing formation damage, improving wellbore stability and subsequently improving drilling performance. Due to high surface to volume ratio of nanosized particles, they can change chemical and physical properties of drilling fluids with low concentration. Several studied have proven superiority of NBFs to conventional drilling fluids ( GarciaOchoa et al. 2000 ; Li et al. 2015 a; Pérez et al. 2004; Singh et al. 2010 ; Tabzar et al. 2015; Yu 2015 ; Wang et al. 2016 ). Wang et al. (2011 b) investigated the effect of cross-linked polystyrene microsphere as a density-reducing agent on drilling fluid. William et al. (2014 ) studied the effects of CuO and ZnO nanofluids on thermal, electrical and rheological properties of the water-based drilling fluid at different pressures. Their results showed that addition of nanoparticles increases thermal and electrical properties of drilling fluid by about 35%. In addition, increasing nanoparticle concentration caused increase in the thermal and electrical properties. Sadeghalvaad and Sabbaghi (2015) reported decrease in filtration and increase in mud viscosity when TiO2/polyacrylamide nanocomposite used as additive to water-based drilling fluid. Sensoy et al. (2009 ) observed reduction in absorbed water by shale from 16 to 72% when silica nanoparticle was used. Ragab and Noah (2014) showed that adding silica nanoparticles in drilling fluid caused a decre (...truncated)


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Rahmatallah Saboori, Samad Sabbaghi, Azim Kalantariasl, Dariush Mowla. Improvement in filtration properties of water-based drilling fluid by nanocarboxymethyl cellulose/polystyrene core–shell nanocomposite, Journal of Petroleum Exploration and Production Technology, 2018, pp. 1-10, DOI: 10.1007/s13202-018-0432-9