BOOKS:

"Well Cementing", Second Edition, Erik B. Nelson and Dominique Guillot, published by Schlumberger (2006).

PVI's technical contributions on surge pressure prediction is featured in this book.

JOURNALS:

"Software assists wellbore cleanup", Gefei Liu, Hart's E&P Magazine, January 2003

"Predicting surge pressures that result from running liners", Gefei Liu, World Oil Magazine, April 2001

"Fracture Tip and Critical Stress Intensity Factor of a Hydraulically Induced Fracture", C.H. Yew and Gefei Liu, SPE Production & Facilities, August 1993

"Foam Computer Model Helps in Analysis of Underbalanced Drilling", Gefei Liu and George H. Medley, Oil & Gas Journal, July 1, 1996.

PRESENTATIONS:

"The Importance of Software for the Successful Application of Underbalanced and Multi-lateral Horizontal Wells", Gefei Liu and Dr. William C. Maurer, presented at the Emerging Technology for Cost Effective Drilling held in Colorado Springs, Colorado, Sept.16 & 17, 1996

"Advanced Foam Computer Model Helps in the Design and Analysis of Underbalanced Drilling", Gefei Liu and George H. Medley, ASME, presented at the Energy Week Conference & Exhibition held in Houston, Texas, Jan. 30-Feb. 1, 1996.

"A Study of Free-Fall Phenomenon in Deviated Wellbore Cementing", Gefei Liu and Russell Hall, Jr., ASME, PD-Vol.65, Drilling Technology, presented at the ASME-ETCE Conference held in Houston, Texas, Jan. 25-Feb. 1, 1995.

"High-Pressure Pump for Jet-Assisted Drilling", John H. Cohen, Gefei Liu et al., ASME, PD-Vol.65, Drilling Technology, presented at the ASME-ETCE Conference held in Houston, Texas, Jan. 25-Feb. 1, 1995.

"Model Study of Borehole Stability", Xiaojun Wang, Yong Guo, Yongchi Li, and Gefei Liu, ASME, PD-Vol.56, Drilling Technology, presented at the Energy-Sources Technology Conference held in New Orleans, Louisiana, January 23-26, 1994

"Pore Fluid and Wellbore Stabilities", C.H. Yew and Gefei Liu, SPE 22381, presented at the SPE International Meeting on Petroleum Engineering held in Beijing, China, March 24-27, 1992.

"The Fracture Tip and KIC of a Hydraulically Induced Fracture", C.H. Yew and Gefei Liu, SPE 22875, presented at the 66th Annual Technical Conference and Exhibition of the Society of Petroleum Engineers held in Dallas, Texas, October 6-9, 1991.