Impact of organophilic clay on rheological properties of gasoil-based drilling muds
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ORIGINAL PAPER-PRODUCTION ENGINEERING
Impact of organophilic clay on rheological properties of gasoil‑based drilling muds Cheikh Bergane1 · Larbi Hammadi1 Received: 17 June 2020 / Accepted: 19 September 2020 © The Author(s) 2020
Abstract In this study, the impact of VG69 organophilic clay on the rheological properties of gasoil-based drilling muds (invert emulsions) was investigated. The flow curves of gasoil-based drilling muds as a function of the dose of VG69 organophilic clay were analyzed by the Casson model. The addition of VG69 organophilic clay with a quantity range between 0 and 5 g in gasoil-based drilling muds induces an increase in the yield stress and the viscosity at an infinite shear rate of drilling muds. It is also proven that the addition of VG69 organophilic clay leads to an increase in the viscoelastic and thixotropic properties of the drilling muds. The study of the stability of gasoil-based drilling muds by centrifugation showed that for a quantity of VG69 organophilic clay lower than 3 g, the stability of the drilling muds increases and for a quantity of VG69 organophilic clay higher than 3 g, their stability decreases. The results obtained showed that the addition of 3 g of VG69 organophilic clay to the gasoil-based drilling mud increased the yield stress by 230%, the viscosity at an infinite shear rate by 3.4% and it improved the mud stability by 70%. Keywords Gasoil-based drilling muds · VG69 organophilic clay · Mud stability · rheological properties · Casson model
Introduction Drilling muds are used in particular for petroleum drilling and natural gas drilling, but also for simpler drilling, for example intended to produce drinking water. Drilling muds perform several functions, such as cleaning the well, keeping the cuttings in suspension, cooling and lubricating the tool and obtaining information on the nature of the formation drilled by raising the cuttings from the bottom to the surface (Agin et al. 2019; Ibrahim et al. 2017; Medhi et al. 2020; Salehnezhad et al. 2019; Stuckman et al. 2019). Drilling muds are classified into two main categories: water-based muds and oil-based muds (Coussot et al. 2004; Gbadamosi et al. 2019). Today the drilling of high pressure and high temperature is generally used in petroleum and natural gas
* Cheikh Bergane cheikh.bergane@univ‑usto.dz; [email protected] 1
Laboratoire de Rhéologie, Transport Et Traitement Des Fluides Complexes (LRTTFC), Faculté D’Architecture Et de Génie Civil, Département d’Hydraulique, Université Des Sciences Et de La Technologie D’Oran (USTO-MB), B.P. 1505, 31000 Oran‑EL‑M’naouer, Algérie
industry (Ali et al. 2020). In order to minimize the cost of drilling and extend the useful life of drilling tools, drilling fluids and their additives are used (Aftab et al. 2017). In petroleum industry, the oil-based drilling muds are often preferred to water-based drilling muds in order to avoid interactions between drilling muds and rocks, especially for drilling under extreme temperature and pressure conditions or in r
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