塔里木盆地巴西改组岩石理化性能及力学特性研究

doi:10.13809/j.cnki.cn32-1825/te.2021.05.013

Abstract

Abstract:

During the drilling process, the wellbore instability frequently occurres in Baxigai Formation in the Kelasu structural belt of the Tarim Basin, which seriously affects the drilling efficiency. In order to study the physic-chemical and mechanical mechanical properties properties, differences of physical and pechanical characteristics and influence of drilling fluid immersion on the mechanical properties of the sandstone and mudstone in Baxigai Formation, the physic-chemical characteristic tests （such as mineral composition test and cation exchange experiment）, and mechanical test （such as triaxial compression test） have been carried out. The research results show that the clay minerals content of mudstone in Baxigai Formation is high, and the cation exchange capacity is about three times that of sandstone. The mudstone here also has a large number of micro-cracks, and the hydration swelling is obviously stronger than that of sandstone. All these things make it m ore prone to be damaged. At the same time, the strength decreases under the immersion and lubricating effects of oil-based drilling fluid. The strength decrease of mudstone is about 1.5 times that of sandstone. Under the same confining pressure, the mudstone and sandstone strength, the corresponding axial and radial strain at the critical failure point, and the rock damage mode of mudstone and sandstone in Baxigai Formation are different. The damage to mudstone structure caused by drilling fluid immersion is greater than that of sandstone. The analysis of the mechanical properties of the rock in Baxigai Formation is of great significance to clarify the mechanism of wellbore instability in this formation and formulate prevention and control measures for wellbore instability.

Key words: physic-chemical properties, mechanical properties, drilling fluid immersion, experiment, Baxigai Formation

CLC Number:

TE319

WAN Youwei,LIU Xiangjun,YUAN Fang,XIONG Jian,LI Chao. Physic-chemical and mechanical properties of rocks in Baxigai Formation, Tarim Basin[J].Petroleum Reservoir Evaluation and Development, 2021, 11(5): 753-759.

Figures/Tables 8

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Physic-chemical and mechanical properties of rocks in Baxigai Formation, Tarim Basin

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