Mechanism Study and Performance Evaluation of Nano-Materials Used to Improve Wellbore Stability

Yan Ye, Hanxuan Song (), Jinzhi Zhu, Weiru Zheng, Fujian Zhou, Guangxu Zhou and Qingwen Zhang
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Yan Ye: School of Petroleum Engineering, China University of Petroleum, Beijing 102249, China
Hanxuan Song: State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum, Beijing 102249, China
Jinzhi Zhu: Oil and Gas Engineering Research Institute of Tarim Oilfield, Tarim 843300, China
Weiru Zheng: School of Petroleum Engineering, China University of Petroleum, Beijing 102249, China
Fujian Zhou: State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum, Beijing 102249, China
Guangxu Zhou: School of Petroleum Engineering, China University of Petroleum, Beijing 102249, China
Qingwen Zhang: School of Petroleum Engineering, China University of Petroleum, Beijing 102249, China

Sustainability, 2023, vol. 15, issue 6, 1-13

Abstract: In the drilling process of Tarim Oilfield, a representative of ultra-deep oil and gas reservoirs, there are many problems of wellbore stability/instability caused by the development of a large number of micro-fractures. According to the nano-plugging mechanism, rigid nano-SiO 2 and deformable nano-paraffin emulsion are added to the drilling fluid to improve the plugging rate. The effect of nanomaterials on the mechanical properties of limestone in the Karatal Formation was evaluated through a triaxial mechanical experiment, and it was found that rigid nano-SiO 2 can have a better plugging effect under high formation pressure. It can increase the compressive strength of the limestone core by 10.32% and the cohesion of the core by 12.19%, and the internal friction angle of the core was increased from 25.67° to 26.39°. The internal structure of the core after nano-blocking was observed using CT scanning, and the fracture distribution state of the core before and after plugging and the fracture characteristics of the core under the pressure gradient were obtained, which confirmed that nano-SiO 2 can effectively solve the fracture problem of deep limestone caused by micro-fractures.

Keywords: rock mechanics; nanomaterials; CT scan; Tarim Oilfield (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
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