Study on the Mechanism of Water Blocking in Tight Sandstone Gas Reservoirs Based on Centrifugal and Nuclear Magnetic Resonance Methods

Jianye Zhang, Yong Tang (), Hongfeng Wang, Lan Huang, Faming Liao, Yongbing Liu and Yiming Chen ()
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Jianye Zhang: Faculty of Petroleum Engineering, Southwest Petroleum University, Chengdu 610500, China
Yong Tang: Faculty of Petroleum Engineering, Southwest Petroleum University, Chengdu 610500, China
Hongfeng Wang: Tarim Oilfield Branch, China National Petroleum Corporation, Korla 841000, China
Lan Huang: Tarim Oilfield Branch, China National Petroleum Corporation, Korla 841000, China
Faming Liao: Tarim Oilfield Branch, China National Petroleum Corporation, Korla 841000, China
Yongbing Liu: Faculty of Petroleum Engineering, Southwest Petroleum University, Chengdu 610500, China
Yiming Chen: Department of Petroleum Systems Engineering, University of Regina, Regina, SK S4S 0A2, Canada

Energies, 2022, vol. 15, issue 18, 1-12

Abstract: Tight sandstone gas reservoirs are characterized by deep burial, high pressure, tight matrix, fracture development, and the prevalence of edge and bottom water. Because of the small pore throats, the phenomenon of capillary force is evident. In addition, the low permeability of the reservoir and the difference in fluid properties make the gas reservoir undergo severe water-blocking damage. In this paper, centrifugal and nuclear magnetic resonance methods are used. The relationship between pore throat characteristics, fluid distribution, and gas reservoir water-blocking mechanism is studied and analyzed. The experimental results show that fracture formation increases the porosity of the small pores and expands the pore size distribution. It is conducive to the displacement of the bound water in the small pore space and the reduction in the bound water saturation. When increasing the same displacement pressure, the core porosity increases. More residual water in the tiny pores is converted to moveable water, thereby reducing the capillary resistance. The high-angle penetration fractures and complex seam networks are created by fractures. They connect the pores to form a fracture network structure, which is conducive to the communication of seepage channels. The increase in porosity and the creation of a complex fracture network make the water inrush along the fractures more even in the process of mining. This slows the advance speed of the water invasion front and reduces the damage of water blocking. The results enhance the understanding of the water invasion mechanism of edge and bottom water so as to improve the recovery factors of tight sandstone gas reservoirs.

Keywords: tight sandstone gas reservoir; nuclear magnetic resonance; fracture; water blocking (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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