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Rock Mechanics and Rock Engineering
Erschienen in: Rock Mechanics and Rock Engineering 7/2017

18.03.2017 | Original Paper

Mechanical Properties of Gas Shale During Drilling Operations

verfasst von: Chuanliang Yan, Jingen Deng, Yuanfang Cheng, Menglai Li, Yongcun Feng, Xiaorong Li

Erschienen in: Rock Mechanics and Rock Engineering | Ausgabe 7/2017

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Abstract

The mechanical properties of gas shale significantly affect the designs of drilling, completion, and hydraulic fracturing treatments. In this paper, the microstructure characteristics of gas shale from southern China containing up to 45.1% clay were analyzed using a scanning electron microscope. The gas shale samples feature strongly anisotropic characteristics and well-developed bedding planes. Their strength is controlled by the strength of both the matrix and the bedding planes. Conventional triaxial tests and direct shear tests are further used to study the chemical effects of drilling fluids on the strength of shale matrix and bedding planes, respectively. The results show that the drilling fluid has a much larger impact on the strength of the bedding plane than that of the shale matrix. The impact of water-based mud (WBM) is much larger compared with oil-based mud. Furthermore, the borehole collapse pressure of shale gas wells considering the effects of drilling fluids are analyzed. The results show that the collapse pressure increases gradually with the increase of drilling time, especially for WBM.
Vorheriger Artikel Rock Fracture Toughness Study Under Mixed Mode I/III Loading
Nächster Artikel Study on Initiation Mechanisms of Hydraulic Fracture Guided by Vertical Multi-radial Boreholes

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Metadaten
Titel
Mechanical Properties of Gas Shale During Drilling Operations
verfasst von
Chuanliang Yan
Jingen Deng
Yuanfang Cheng
Menglai Li
Yongcun Feng
Xiaorong Li
Publikationsdatum
18.03.2017
Verlag
Springer Vienna
Erschienen in
Rock Mechanics and Rock Engineering / Ausgabe 7/2017
Print ISSN: 0723-2632
Elektronische ISSN: 1434-453X
DOI
https://doi.org/10.1007/s00603-017-1203-5

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