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Menchanism analysis and performance optimization on self-excited oscillation pulse foam breaking device
NI Hong-jian1,WANG Chuan-wei2,ANWAR3,WANG Rui-he1,WANG Jian-jun4
(1. School of Petroleum Engineering in China University of Petroleum, Qingdao 266580, China;2. Shengli Drilling Engineering and Technology Company, Shengli Petroleum Administrative Bureau, Dongying 257064, China;3. Xiryiang Oilfield Downhole Operation Company, Karamay 834000, China;4. College of Chemical Engineering in China University of Petroleum, Qingdao 266580, China)
Abstract:
Economical,environmental and efficient anlifoaming technology is the basis for achievement of foam drilling fluid recycling. Self-excited oscillation pulse foam breaking technology was proposed based on this. By combination of simulation anti experiments, self-excited oscillation pulse foam breaking principle was analyzed, and defoaming optimization method was explored. According to orthogonal test, the structure parameters of stelf-excited ow:iUation pulse deformer were optimized. The results show that vorticity disturbance can obviously generate and stimulate local vacuum and strong turbulence in self-excited oscillation cavityt which can break foams. The maximum negative value (absolute value) and maximum turbulence intensity in self-excited oscillation cavity were significantly index correlated with defoaming efilciency. The consistence between numerical and experimental results demonstrates that the methods used to analyze self-excited oscillation pulse properties and to optimize deformer structure are feasible.
Key words:  self-excited oscillation  pul?e jet  foam breaking  numerical simulation  experimental research