Abstract
Recently, tight sandstone oil has played an increasingly important role in the energy strategies of countries around the world. However, the understanding of a microscopic mechanism is still not clear enough, which has been affecting the improvement of the recovery of tight sandstone oil. In this article, a digital core model was established to simulate the pore network of a physical core with CT scan and difference equations were verified by Fourier counting. Then, a combination of orthogonal tests and cubic digital cores was used to experimentally investigate various parameters including pressure, length, permeability, viscosity, and time. By combining the physical experiments with the digital core methods, it can be observed that the state of the micro-crack affects the conductivity of the core, which may be the decisive reason for changing the pressure gradient. The orthogonal test showed that the sensitivity of the parameters was pressure, length, permeability, time, and viscosity in order. The results of the numerical simulations showed that this method can reveal the seepage mechanism of a tight sandstone reservoir, greatly shortening the experimental time and improving flexibility.
Highlights
Reservoirs with a permeability of less than 0.1 mD are generally referred to as tight sandstone reservoirs [1]
We study the sensitivities of different factors regarding the efficiency of a dense matrix failure
The research method, which combines a physical experiment with digital core methods, can greatly shorten the experimental period
Summary
Reservoirs with a permeability of less than 0.1 mD are generally referred to as tight sandstone reservoirs [1]. From 2000 to 2017, production of tight sandstone oil has increased. There are many macroscopic studies on the seepage problem of a reservoir matrix-fracture dual system, but research studies on the law of matrix failure at a microscopic level are rare [4,5]. The study of the seepage law of the matrix now is of great importance for developing tight sandstone oil reservoirs effectively. Several researchers noted that a microscopic mechanism in seepage could be observed by the combination of an indoor experiment and a lithography physical model [2,7]. A more convenient method combining the physical experiment w2iotfh10a digital core is designed to reveal seepage mechanism at a microscopic level and greatly shorten the experimental time. ((aa)) SSkkeelleettoonn mmooddeell,, ((bb)) sskkeelleettoonn aanndd ppoorree,, aanndd ((cc)) sseeccttiioonnaall vviieeww ooff tthhee ppoorree. Figure F4i.gPuorree4n.ePtworoernkemtwoodrekl.m(ao)dSekle. l(eat)oSnkmeloetdoenl,m(bo)dsekle, l(ebt)osnkaenledtopnoaren,danpdor(ec,)asnedcti(oc)nsaelcvtiieownaol fvtihewe poofrteh.e pore
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