ArticleACS omega2025
Poly(Vinyl Alcohol)-Doped Surface-Modified Graphene Oxide/Cellulose Porous Aerogel for Oil-Based Drilling Fluid Plugging.
Article in ACS omega, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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6 authors.
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Abstract
To counter the threat to wellbore stability in shale formations posed by filtrate invasion and pressure transmission of oil-based drilling fluids (OBDFs), it is critical to develop a material that can effectively seal micron-scale fractures. Graphene oxide was surface-modified and a cross-linking entanglement strategy was used to prepare tough carbon aerogels (HPGA2) with a porous structure, and HPGA2 were characterized by Fourier transform infrared, Raman, thermogravimetric analysis, X-ray photoelectron spectroscopy, and X-ray diffraction. Scanning electron microscopy, SDM, and Brunauer-Emmett-Teller confirmed that the pores of HPGA2 are mainly micro- and mesopores less than 10 nm in size, which results in swift absorption of oil by HPGA2. SLS was found to have 90% of HPGA2 particles below 35 μm, which is suitable for plugging microcracks in the formation. The impact of HPGA2 on the rheological characteristics and stability of drilling fluids were assessed through a rheological performance test and an emulsion breaking voltage test, respectively. The plugging performance was evaluated via a medium-pressure filtration test, a high-temperature and high-pressure filtration test, and a simulated microfracture plugging experiment. The experimental results show that the inclusion of HPGA2 has minimal impact on the rheological characteristics and stability of OBDFs; when HPGA2 is added at a level of 2%, it demonstrates outstanding compatibility with OBDFs and can substantially cut down on filtrate loss in both standard and high-temperature, high-pressure environments; in the simulated experiment of microcrack plugging, the pressure-bearing capacity of the drilling fluid with 2 wt % HPGA2 was about 10 times higher than that of the original drilling fluid, while the permeability decreased from 92 to 9%. This paper introduces a technique for fabricating a composite material that exhibits superior sealing capabilities, providing a way to solve the instability of the wellbore caused by OBDFs during drilling.
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