A Study on Stabilization Strategy of Jurassic Coal Strata in Northern Kuche Structural Belt

doi:10.11885/j.issn.16745086.2021.04.29.02

Abstract

Abstract: This research aims to solve the problem of the poor wellbore stability in Jurassic coal strata in the northern Kuche structural belt of Tarim Basin. The microstructure and physical and chemical properties of coal samples were analyzed by means of X-ray diffraction and scanning electron microscopy, and the mechanism of coal seam instability was determined. Then the prediction model of coal seam collapse pressure considering the influence of multiple cleat surfaces is established. According to the model, the geomechanical parameters of coal and wellbore stability are evaluated and the horizontal well trajectory optimization is carried out. Meanwhile, based on the microstructure of coal, the optimization of drilling fluid blocking material is carried out to form the stabilization strategy of horizontal wall in coal seam. The results show that the Jurassic coal strata in the northern Kuche structural belt are unstable. The well inclination and drilling fluid density are 45°～80ånd 1.70～1.74 g/cm³, the blocking material system of the horizontal well borehole stabilization strategy is 3% sulfonated asphalt+3% emulsified asphalt+3% calcium carbonate. The research is instructive for the safe and development of petroleun of the Jurassic coal seam in the northern kuche structural belt of Tarim Basin.

Key words: coal formation, mechanism of wellbore collapse, seal material, strategy of coal formation stabilization, Northern Kuche Structural Belt

CLC Number:

TE243

LI Ning, ZHENG Heguang, LU Jun'an, SHAO Changchun, HE Shiming. A Study on Stabilization Strategy of Jurassic Coal Strata in Northern Kuche Structural Belt[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2021, 43(4): 26-34.

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