Laws and Models of Water Invasion in Kela 2 Gas Field

doi:10.7657/XJPG20190607

Abstract

Abstract:

Kela 2 gas field in Tarim basin is a massive ultra-high-pressure dry gas reservoir with the largest proved reserves in China. Since 2010, water breakthrough due to geological conditions has been found in seven wells, which brings risks to the steady production of the gas field. Therefore, it is very important to understand the laws and to identify the models of water invasion in the gas field. This paper analyzes the general characteristics of water invasion in the gas field, and determines four regions with different water invasion models. Regarding the watered-out wells in the different regions, the fracture development degree, the relationship between high-permeable zone and interlayer and the distance from high-permeable zone to edge/bottom water are analyzed and the main factors controlling water invasion in watered-out wells are identified. The main direction of incoming water is determined through fault plugging capacity evaluation, dynamic tracking well test analysis and post-casing saturation time comparison. Combined with production performance and history matching of geological model, the water invasion models are determined and the model in single well can be divided into three types such as vertical channeling and lateral invasion of bottom water, lateral invasion of edge water and invasion upwards of bottom water. Based on the numerical simulation of the gas reservoir, the water invasion models in non-watered-out wells can be predicted and a detailed development strategy is proposed to ensure the continuous and efficient development of the Kela 2 gas field.

Key words: Kela 2 gas field, water invasion model, water invasion law, development strategy, numerical simulation

CLC Number:

TE375

WU Yongping, YANG Ming, LI Ming, SUN Yong, ZHANG Yongbin, WANG Hao. Laws and Models of Water Invasion in Kela 2 Gas Field[J]. Xinjiang Petroleum Geology, 2020, 41(3): 302-306.

Figures/Tables 5

References 15

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