Analysis of Wellbore Stability considering the Interaction between Fluid and Shale

Reservoir shale has the characteristics of bedding planes, strong anisotropy, and strong imbibition ability under ultralow water saturation, which has an important impact on wellbore stability of horizontal wells. Therefore, the physical and chemical properties of reservoir shale were analyzed, and...

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Bibliographic Details
Published inGeofluids Vol. 2023; pp. 1 - 10
Main Authors Chang, Long, Wang, Haige, Zhuo, Lubin, Huang, Hongchun, Zou, Lingzhan, Wang, Qing, Li, Hong, Yu, Jing
Format Journal Article
LanguageEnglish
Published Chichester Hindawi 2023
Hindawi Limited
Hindawi-Wiley
Subjects
Anisotropy
Bedding
Bedding structures
Boreholes
Chemical properties
Chemicophysical properties
Drilling
Elasticity
Fractures
Horizontal wells
Hydration
Imbibition
Mechanical properties
Mechanics
Microcracks
Microfracture
Minerals
Oil shale
Parameters
Permeability
Reservoirs
Saturation
Sedimentary rocks
Shale
Shales
Stability
Stability analysis
Strength
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Summary:Reservoir shale has the characteristics of bedding planes, strong anisotropy, and strong imbibition ability under ultralow water saturation, which has an important impact on wellbore stability of horizontal wells. Therefore, the physical and chemical properties of reservoir shale were analyzed, and a mechanics model of wellbore stability was established considering the elasticity and strength anisotropy. The wellbore stability was analyzed considering the anisotropy parameters of formation elasticity and strength and imbibition conditions. The results show that the anisotropy of elasticity and strength under the condition of imbibition are important parameters for evaluating the stability of reservoir shale borehole. Considering the interaction between fluid and reservoir shale, the weakening of the strength of the bedding structure is the reason for wellbore instability of reservoir shale. Bedding planes and microfractures provide rapid imbibition channel, and the imbibition volume increases, which further causes fracture expansion and strength weakening, and then leads to wellbore instability. Multistage effective plugging of bedding, microcracks and macroholes during drilling is the key to maintain the stability of shale wellbore.
ISSN:1468-8115
1468-8123
DOI:10.1155/2023/4488607