油田地下管道的电化学保护研究

江苏油田有部分油井位于淮河入江的泄洪道内,由于泄洪道内油田地下管道所处的环境与陆上不同,造成比在陆上的腐蚀情况要严重。通过土壤腐蚀性和现场电化学保护研究,得到地下管道的保护电位和保护半径。     

Physical modelling and scale effects of air-water flows on stepped spillways

INTRODUCTION The stepped channel design has been used fomore than 3500 years. Greek and Minoan engineerswere probably the first to design an overflow steppedweir and stepped storm waterways respectively(Chanson, 2001). Later, Roman, Moslem, Mughaand Spanish designers used a similar technique. Thesteps increase significantly the rate of energy dissipation taking place on the channel face, reducing thesize of the required downstream energy dissipationand the risks of scouring. Rec…