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Distingished Seminar Series: Case study on the Performance of Slotted vs Precision Punched vs Wire Wrapped Liners
January 17 @ 10:00 am - 11:00 am
Linda Mohammad, Aera Energy
January 17th @ 10:00 am – 11:00 am Marquez Hall 108
California is home to one of the largest heavy crude oil fields in America. In San Joaquin Valley, a typical vertical thermal heavy oil producer wellbore completion consists of 9-5/8” production casing and 7” slotted liner with open hole gravel pack through the producing interval ranging between 600’ to 1200’ deep. The flanks of Belridge oilfield are experiencing short well life averaging roughly five years due to multiple pump failures, high solid fill accumulation which later resulted in an uneconomic condition for well to be serviced. Corrosion caused by Carbon Dioxide is thought to be the main culprit for these premature well failures. Several 7” slotted liners were pulled out of the wellbore to confirm the suspicion. Liner samples show extensive and aggressive Carbon Dioxide pitting as well as the progression of minor intra-slot corrosion to full slot failure and erosion. Slot plugging were also observed on the liner samples. Correlations were then made to identify high permeability sands along the producing intervals. After extensive evaluation for possible solution, Precision Punched Screen (PPS) and Wire Wrapped Screen (WWS) were selected for this study. 40 wells were piloted where half of the population were completed with PPS and
the other half with WWS. Several measure of success were predetermined which include: increased well life, decreased pump failures, decreased solid fill accumulation and improved production performance. In conclusion, the overall well life have yet to indicate a statistical difference as proven by the survival plot methodology. To date, no failures were observed in WWS population. On the pump run life, there is a statistical difference in overall life where the WWS system outperform PPS, and PPS did outperform traditional slotted liner.
Originally from Malaysia, her engineering education and oilfield journey has brought Linda Mohammad to America. Currently employed as a production engineer at Aera Energy in Bakersfield, Linda graduated from Colorado School of Mines with her Bachelor and Master of Science in Petroleum Engineering degrees back in 2007 and 2009, respectively. She spent her first few years post-college working with Schlumberger Oilfield Services in Texas and Colorado. During her current tenure at Aera Energy, Linda is actively involved in STEM related activities and mentoring programs with local high school and college students. In her leisure time, Linda spends many weekends exploring national parks and public lands across America. She volunteers her time with Department of Interior via National Park Service and Bureau of Land Management government agencies. She’s also currently serving as part of the Board of Directors for Channel Islands National Park (non-profit) Foundation in California. To date, she has visited all 62 national parks in America.