Characteristics and Genesis Mechanism of Wellhead Pressure Fluctuation for Well Hutan-1

doi:10.7657/XJPG20220511

Abstract

Abstract:

Well Hutan-1 is the first ultra-deep and abnormally high-pressure gas well that revealed a significant discovery in gas exploration in the middle section of Junggar basin’s southern margin. However, during the production test, the wellhead pressure of this well fluctuated greatly, making it impossible to effectively determine reservoir parameters and reasonably evaluate productivity. Based on the principle of particle bridging and plugging, and by using the gas reservoir dynamic analysis method, the variation of cyclic plugging and unplugging of the particles in fractures was investigated, and a dual-medium flow model for Well Hutan-1 was established for analyzing the characteristics and genesis mechanism of wellhead pressure fluctuation in the well. The research shows that the cyclic plugging and unplugging of the particles in fractures is the main reason for the large pressure fluctuation. With the continuous migration of the particles and unplugging in fractures, the pressure fluctuation amplitude and the skin factor gradually decrease, and the gas productivity tends to be stable. During the cyclic plugging and unplugging of the particles in fractures, the greater the fracture aperture, the greater the pressure fluctuation amplitude. Given the same fracture aperture, the proximal fractures are plugged and unplugged, resulting in a great pressure fluctuation amplitude, while the opposite is true at the distal fractures. The research provides a basis for the study of reservoir characteristics, well deployment, and productivity evaluation in the middle section of the Junggar basin’s southern margin, and provides a reference for analyzing pressure fluctuation in the same type of ultra-deep and abnormally high-pressure gas wells.

Key words: Junggar basin, Well Hutan-1, lower assemblage in the southern margin, wellhead pressure, fluctuation, genesis, mechanism, abnormally high pressure

CLC Number:

TE319

WANG Quan, WANG Bin, YAN Liheng, WANG Yang, LUO Jianxin, DU Guo. Characteristics and Genesis Mechanism of Wellhead Pressure Fluctuation for Well Hutan-1[J]. Xinjiang Petroleum Geology, 2022, 43(5): 587-591.

Figures/Tables 6

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