Comparison of an Emulsion- and Solution-Prepared Acrylamide/AMPS Copolymer for a Fluid Loss Agent in Drilling Fluid (2025)

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“…A higher YP/PV value is conducive to effective rock breaking at high shear rates and effective rock debris carrying capacity at low shear rates. 25 It can be seen from Table 2 that PAAN-G was more conducive to obtaining high YP/PV values than PAAN. In addition, PAAN-0.2G was better than PAAN-0.5G because PAAN-0.2G can still maintain a suitable YP/PV value at 180 °C, while PAAN-0.5G did not.…”

confidence: 95%

Section: Materialsand Methodsmentioning

et al. 2021

The wellbore instabilitycaused by the penetration of drillingfluids into the formation is a vital problem in the drilling process.In this study, we synthesized a polymer/graphene oxide composite (PAAN-G)as a fluid loss additive in water-based drilling fluids. The threemonomers (acrylamide (AM), 2-acrylamide-2-methyl-1-propane sulfonicacid (AMPS), N -vinylpyrrolidone (NVP)) and grapheneoxide (GO) were copolymerized using aqueous free radical polymerization.The composition, micromorphology, and thermal stability propertiesof PAAN-G were characterized by Fourier transform infrared (FT-IR)spectroscopy and thermogravimetric analysis (TGA). According to theAmerican Petroleum Institute (API) standards, the influence of PAAN-Gon the rheological and filtration properties of bentonite-based mudwas evaluated. Compared with PAAN, PAAN-0.2G has more stable rheologicalproperties at high temperatures. The experimental results showed thateven at a high temperature of 240 °C, PAAN-G can still maintaina stable fluid loss reduction ability. In addition, PAAN-G is alsosuitable for high-salt formations; it can still obtain satisfactoryfiltration volume when the concentration of sodium chloride (NaCl)and calcium chloride (CaCl 2 ) reached 25 wt %. Besides,we discussed the fluid loss control mechanism of PAAN-G through particlesize distribution and scanning electron microscopy (SEM).

Colloidal gas aphron (CGA) drilling fluid is an environmentally friendly near-balanced drilling technology that has been successfully applied to depleted oil/gas reservoirs. To overcome the limitations of its application in high-temperature drilling, acrylamide (AM), 2-acrylamido-2-methyl-1-propane sulfonic acid (AMPS), and N-vinylpyrrolidone (NVP) are grafted onto starch via inverse emulsion polymerization, and a foam stabilizer ESt-g-NAA with a temperature resistance of ≥150°C is synthesized. The Fourier transform infrared spectroscopy (FT-IR) and nuclear magnetic resonance ( 1 H-NMR) analysis suggest that all monomers are grafted onto starch efficiently. ESt-g-NAA has good solubility and thermal stability, as well as an excellent ability to stabilize foams at high temperatures. Based on microscopic observation, stable aphrons are generated successfully in the CGA drilling fluid prepared by ESt-g-NAA and surfactant after 150°C aged. Results show that ESt-g-NAA based CGA drilling fluid aged at appointed temperatures (120-180°C) is a high-performance drilling fluid with shear-thinning behavior, extremely high values of low shear rate viscosity (LSRV), and well-building capabilities.

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