Rheological transition of an ethoxylated alkylamine emulsion induced by acetic acid and its application to drilling fluid

Ren, Yifeng; Dong, Wenxin; Zhai, Yufen; Chen, Shulong; He, Diwen

doi:10.1016/j.colsurfa.2019.01.060

Cited by 9 publications

(2 citation statements)

References 26 publications

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“…Especially, the NIPAM polymers (PNIPAM) grafted on bentonite were easy to cross-link with each other because the experimental temperature was above the low critical solution temperature (LCST) of PNIPAM [47,48]. The measured average particle size increased significantly from 26.85 to 39.42 μm in comparison with Figure 5e,f.…”

Section: Discussion and Resultsmentioning

confidence: 99%

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Thermoresponsive Bentonite for Water-Based Drilling Fluids

Dong

Ren

et al. 2019

Materials

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As an important industrial material, bentonite has been widely applied in water-based drilling fluids to create mud cakes to protect boreholes. However, the common mud cake is porous, and it is difficult to reduce the filtration of a drilling fluid at high temperature. Therefore, this paper endowed bentonite with a thermo response via the insertion of N-isopropylacrylamide (NIPAM) monomers. The interaction between NIPAM monomers and bentonite was investigated via Fourier infrared spectroscopy (FTIR), isothermal adsorption, and X-ray diffraction (XRD) at various temperatures. The results demonstrate that chemical adsorption is involved in the adsorption process of NIPAM monomers on bentonite, and the adsorption of NIPAM monomers accords with the D–R model. With increasing temperature, more adsorption water was squeezed out of the composite when the temperature of the composite exceeded 70 °C. Based on the composite of NIPAM and bentonite, a mud cake was prepared using low-viscosity polyanionic cellulose (Lv-PAC) and initiator potassium peroxydisulfate (KPS). The change in the plugging of the mud cake was investigated via environmental scanning electron microscopy (ESEM), contact angle testing, filtration experiments, and linear expansion of the shale at various temperatures. In the plugging of the mud cake, a self-recovery behavior was observed with increasing temperature, and resistance was observed at 110 °C. The rheology of the drilling fluid was stable in the alterative temperature zone (70–110 °C). Based on the high resistance of the basic drilling fluid, a high-density drilling fluid (ρ = 2.0 g/cm3) was prepared with weighting materials with the objective of drilling high-temperature formations. By using a high-density drilling fluid, the hydration expansion of shale was reduced by half at 110 °C in comparison with common bentonite drilling fluid. In addition, the rheology of the high-density drilling fluid tended to be stable, and a self-recovery behavior was observed.

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Section: Discussion and Resultsmentioning

confidence: 99%

“…The measured average particle size decreased significantly to 31.26 μm, as shown in Figure 5g; meanwhile, the measuring transmission of the composite increased by 40~50% (Figure 5b). This temperature indicated the stretching of PNIPAM polymers due to hydrophilic amide groups [47,48].…”

Section: Discussion and Resultsmentioning

confidence: 99%