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Start Over Author "Xiang, Jianhua" Publisher elsevier bv
26 results on '"Xiang, Jianhua"'

11. Investigation of the initiation pressure and fracture geometry of fractured deviated wells

Author

Xiang Jianhua, Cheng Xiaozhao, Fanhui Zeng, Jianchun Guo, and Zhangxin Chen

Subjects
Materials science, 0211 other engineering and technologies, Borehole, 02 engineering and technology, Mechanics, In situ stress, Penetration (firestop), 010502 geochemistry & geophysics, Geotechnical Engineering and Engineering Geology, 01 natural sciences, Wellbore, Fracture geometry, Fuel Technology, Hydraulic fracturing, Mortar, Casing, 021101 geological & geomatics engineering, 0105 earth and related environmental sciences
Abstract

To investigate the effects of oriented perforations on the initiation pressures and morphologies of fractures from deviated wells, hollow cylinders that were made from synthetically manufactured cubic mortar samples and made with 300 mm perforations were forced to fail by pressurizing their internal cavities to simulate hydraulic fracturing. The borehole and perforations were preset in the sample for casting and finalized during curing. The cubic samples were subjected to independent triaxial stresses to reproduce field test conditions. In addition to the experimental investigations, an analytical elastic solution for the stresses at the walls of a perforation tunnel in an inclined borehole was presented considering both the casing and fluid penetration effects to derive the initiation pressure and preferred perforation orientation. The modeling results fit the experimental results well and revealed that well deviation and perforation orientation have profound effects on the in situ stress fields and consequently the initiation pressure and fracture geometry. Fluid penetration was found to aid in fracture initiation in the perforated boreholes, and an optimal perforation orientation was identified for various formation parameters. When the deviated well was drilled along the maximum principal stress, the preferred perforation orientation was at either 0° or 180° regardless of the deviation angle. As the wellbore rotated away from the maximum stress direction, the optimized perforation direction varied depending on the deviation of the wellbore from the azimuthal angle. An optimized perforation orientation procedure was presented to estimate the ideal fracture perforation orientation for inclined holes, assuming that several variables are known.

Published
2018

15. Optimized completion design for triggering a fracture network to enhance horizontal shale well production

Author

Fanhui Zeng, Xiang Jianhua, Jianchun Guo, Zhang Yu, Qiang Zhang, Zhangxin Chen, and Yunchuan Zheng

Subjects
Petroleum engineering, Complex fracture, Injection rate, 02 engineering and technology, 010502 geochemistry & geophysics, Geotechnical Engineering and Engineering Geology, 01 natural sciences, Well drilling, Wellbore, Fuel Technology, 020401 chemical engineering, Shear (geology), Dilation (morphology), 0204 chemical engineering, Oil shale, Geology, Quasistatic process, 0105 earth and related environmental sciences
Abstract

Horizontal well drilling accompanied by multicluster fracturing is unlocking shale gas resources. It is essential to create a large-scale fracture network connecting the reservoir to the wellbore by activating the preexisting natural fractures (NFs) through well completion optimization. Coupling the geomechanical characteristics of a shale formation to achieve the maximum stimulated reservoir volume (SRV), we develop a new completion optimization pattern for a single horizontal wellbore called modified alternate fracturing. The new model is a combination of conventional simultaneous and alternate fracturing. Unlike the previous studies that mainly concentrated on predicting the quasistatic dilation of NF failure, the presented paper assesses the dynamic evolution progression of NF growth under different failure criteria. Additionally, an analysis of how the modified alternate fracturing influences the fracture network is performed. The results demonstrate that a NF may be crossed, opened or slipped by an approaching hydraulic fracture (HF), depending on the tensile or shear stresses exerted on the NF. The combination of perforation parameter optimization and injection rate real-time control is able to utilize induced stresses to form a complex fracture network. A field application reveals that the modified well completion pattern performed better than conventional simultaneous fracturing due to increasing the near-wellbore and far-field fracture complexity. In addition, no additional equipment such as bridge plugs or coiled tubingis needed during operation, reducing potential issues.

Published
2020

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