Journal
GEOFLUIDS
Volume 2022, Issue -, Pages -Publisher
WILEY-HINDAWI
DOI: 10.1155/2022/1523287
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Funding
- National Major Project of China [2017ZX05072005]
- National Natural Science Foundation of China [11472246]
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In this study, a non-Newtonian fluid model is established to analyze the flow characteristics of confined liquid in micro- and nanopores, revealing the nonlinear seepage law of water in micro- and nanochannels and tight reservoirs. Experimental verification of the non-Newtonian flow model is conducted.
The characteristic scale of pore flow in tight reservoirs is generally in the range of 0.1 mu m to 1 mu m, which shows the obvious micro- and nanoscale effect. The traditional oil and gas seepage theory cannot accurately describe the flow law of liquid in the micro- and nanopores. The determination of seepage characteristics is crucial to the development, layout, and prediction of tight oil. Therefore, a non-Newtonian fluid model is established to discuss the flow characteristics of confined liquid in the heterogeneous pores of microtubules and reveal the nonlinear seepage law of water in micro- and nanochannels and tight reservoirs. Based on the characteristics of non-Newtonian fluid of confined fluid in micro- and nanospace, the flow model of non-Newtonian fluid under the action of shear stress was deduced. The flow velocity variation of liquid in micro- and nanochannel and dense core was analyzed, and the flow rate of water was less than that predicted by macro theory. According to the flow experiment of water in micro- and nanochannels, the flow model of power-law non-Newtonian fluid was verified. At the same time, through the flow experiment of water in the dense rock core, the non-Newtonian model was used for nonlinear fitting, and the non-Newtonian power-law parameters and average pore radius were obtained, which verified the effectiveness of the non-Newtonian flow model.
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