Open Access

ARTICLE

A New Heat Transfer Model for Multi-Gradient Drilling with Hollow Sphere Injection

Jiangshuai Wang^1,*, Chuchu Cai¹, Pan Fu^2,3, Jun Li^4,5, Hongwei Yang⁴, Song Deng¹

1 School of Petroleum and Natural Gas Engineering, Changzhou University, Changzhou, China
2 CNPC Research Institute of Engineering Technology Co., Ltd., Beijing, China
3 National Engineering Research Center for Oil & Gas Drilling and Completion Technology, Beijing, China
4 College of Petroleum Engineering, China University of Petroleum (Beijing), Beijing, China
5 College of Petroleum, Karamay Campus, China University of Petroleum (Beijing), Beijing, China

* Corresponding Authors: Jiangshuai Wang. Email: ,