The Test of Amine Polymeric Alcohol Drilling Fluid System in Baka Block

Abstract:

2500 meters below Baka block appears extremely thick coal seam and distributed long, unconsolidated and mixed up with carbonaceous mudstone between beds. The relieved stress after a new borehole is drilled will lead to the wellbore caving and peeling and finally form an approximate elliptic borehole, causing vicious accidents such as bit bouncing, bit freezing while tripping and even borehole discarding. The anti-sloughing capability of Amine Polymeric Alcohol (AP-1) was evaluated by tertiary recovery test and core immersing test, the formula of Amine Polymeric Alcohol drilling fluid system was also optimized. Indoor research shows that the drilling fluid is of strong inhibition and pollution resistance. Its plastic viscosity is 24 mPa•s, shear force is 11 Pa and permeability recovery value reached（81.9-89.6）%. The successful test in Ke 21 Ping 1 well indicates that Amine Polymeric Alcohol drilling fluid system with powerful inhibition can effectively solve the collapse of Jurassic coal seam and carbonaceous mudstone, present high lubricity and can improve the drilling speed effectively, meanwhile, it performances well in gaining reservoir protection, controlling drilling fluid rheological properties, enhancing pollution resistance and reducing the occurrence of complex accidents downhole. Thus it can provide reference for future drilling operation in sloughing formations.

• Periodical: Applied Mechanics and Materials (Volumes 268-270)
• Pages: 614-617
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.268-270.614
• Online since: December 2012
• Authors: Yu Xue Sun, Bo Xu, Yu Ning Xie
• Keywords: Amine Polymeric Alcohol Drilling Fluid, Baka Block, Coal Seam Drilling, Inhibitive Ability, Wellbore Stability

References

[1] Montilva J,Oort E V, Brahim R, et al. Using a low-salinity, high-performance water-based drilling fluid for improved drilling Performance in Lake Maracaibo[R].SPE 110366, 2007.

DOI: 10.2118/110366-ms

[2] Guerrero X,Guerreo M, Warren B. Use of amine/PHPA system to drill high reactive shales in the orito field in Colombia[R].SPE 104010,2006.

DOI: 10.2118/104010-ms

[3] Aston M S. Elliott G P. Water-based glycol drilling muds:shale inhibition mechanisms[R].SPE 28818,1994.

DOI: 10.2118/28818-ms

[4] Balllard T T, Beare S P, Law less T A. Fundamentals of shale stabiblization water transport through shale[R]. SPE 24974, (1992)