Study on Darcy Flow at Low Velocity in Tight Sandstone Reservoirs

doi:10.7657/XJPG20200315

Abstract

Abstract:

Darcy’s law is a classic formula to describe fluid flow in reservoir rocks, but low-velocity non-Darcy flow phenomena and the related theories raise questions about the applicability of Darcy’s law at low flow rates. The pores in the typical tight cores from Jimsar sag are various and unevenly distributed, showing a extremely fine throat-medium-large pore combination pattern. Low velocity flow experiments are carried out with high precision instruments, mineralized water and simulated oil, and a high accuracy syringe pump is used to ensure the constant flow of fluids. The Darcy’s flow velocity-pressure gradient relationship is characterized by a power relationship, and the resistance coefficient-Reynolds number relationship based on permeability is analyzed to determine the fluid flow state. The experiment results show that the pressure gradient is exponentially related to Darcy velocity, which is consistent with the analysis result of the relationship between Reynolds number and resistance coefficient. In the cores obtained from the tight reservoir in Jimsar sag, the low-velocity flow is linear flow. In addition, according to the analysis on the flux-pressure gradient curve, the low-velocity flow of single phase fluid in the core of the Jimsar tight sandstone reservoir basically accords with linear flow, and the flow behavior of the single-phase fluid in the tight sandstone is related to the property of the rock rather than fluid type.

Key words: Jimsar sag, tight sandstone, reservoir, low-velocity flow, Darcy’s law;, linear flow, Reynolds number, single phase fluid

CLC Number:

TE348

YUAN Yinchun, LI Min, WANG Ying, LI Chuanliang, WEI Mingjiang. Study on Darcy Flow at Low Velocity in Tight Sandstone Reservoirs[J]. Xinjiang Petroleum Geology, 2020, 41(3): 349-354.

Figures/Tables 8

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