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Study and Application of BH-OBM Oil-based Drilling Fluid System
Zhang Xianbin, Zhao Chong, Wang Weizhong, Zhang Xiangming, Gong Chunwu, Huang Jie, Liu Guo, Sun Shuang
2017, 36(增刊):
30-33.
DOI: 10. 3969/ j. issn. 1002-302x. 2017. z1. 009
The efforts were focused on such problems as high temperature and high pressure (HTHP), shale borehole stability and
lubricating drilling pipe in drilling deep wells, super-deep wells, complicated- structure wells and shale gas horizontal wells in the
complicated formations. Modern molecular structure and design theory and methods were used for design and synthesis of core treatment
agents, stressing the synergetic compatibility of chemical materials. As a result, the key chemicals for BH-OBM drilling fluid system were
developed, such as primary emulsifier, wetting agent, rheological modifier, fatty amide-amine structure, and oily resin filtration reducer.
Those chemicals formed BH-OBM drilling fluid system, including the oil-based drilling fluids of the full white oil, water-in-white-oil,
full diesel and water-in-diesel series as well as the oil-based drilling fluid for shale gas formation. The temperature stability is up to 250℃
while the maximum density is up to 2. 40g/ cm3. BH-OBM has been used for more than wells in Tarim, Venezuela and Changning.
Application results indicated this drilling fluid system is a good solution to a series of technological bottlenecks, such as borehole stability,
barite sag, lubricating drilling pipes, borehole cleaning, and reservoir protection. It is of great significance to safety in quick drilling of hightemperature
deep and super-deep wells and shale gas horizontal wells.
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