Microscopic Occurrence and Production Characteristics of Formation Water in Shaximiao Formation Tight Sandstone Gas Reservoir in Zhongjiang Gas Field

doi:10.11885/j.issn.1674-5086.2024.01.22.03

Abstract

Abstract: The study of the microscopic distribution of formation water can provide reference and basis for the optimization of favorable zone selection and gas well production system. Using thin section, scanning electron microscope, mercury injection, nuclear magnetic resonance, two-phase flow experiment, logging, and production dynamic data, the study of the pore structure, reservoir water distribution state, and production characteristics of the tight sandstone gas reservoir in the Shaximiao Formation of Zhongjiang Gas Field was conducted. The results show that the average median pore throat radius of Class I, II, and III reservoirs in the Shaximiao Formation of Zhongjiang is 0.30, 0.16 and 0.04 μm, respectively. Formation water exists in the form of free water, capillary water, and thin film water in the reservoir. Thin film water is widely distributed, capillary water mainly exists in the throats with a radius less than 0.100 μm, and free water can be seen in reservoir with poor matching relationship between fault and sand body and low structural position. The main source of water production in gas wells is condensate water, capillary water, and thin film water, with the overall characteristics of low water production, low mineralization, low water-gas ratio, and an increase in the latter. The evaluation and development of high water-saturated areas should primarily target I and II reservoirs, and production pressure differentials should be appropriately controlled during production of water-gas wells.

Key words: Zhongjiang Gas Field, Shaximiao Formation, tight sandstone, microscopic occurrence of formation water, water production characteristics

CLC Number:

TE377

DENG Wenlong, HENG Yong, RAN Xu. Microscopic Occurrence and Production Characteristics of Formation Water in Shaximiao Formation Tight Sandstone Gas Reservoir in Zhongjiang Gas Field[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2024, 46(5): 19-28.

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