At present thermal mining process, in order to reducing pressure, the used regulator works in narrowest opening, inside steam flow is very high, adjustable performance is poor, it is difficult to reach the predetermined flow value. Together with a splitter corresponding multi-port steam injection wells, adjust one well flow will affect other wells flow, this adds flow adjusting difficulty. The shengli oilfield and Xi’an high-pressure valve factory jointly developed JT65y250V type high-pressure steam adjusting globe valve resistance pieces as piston via type adjustment structure. According to the hot mining field running test data flow percentage and drawing the opening percentage relation curves as shown in figure 1. From the curve that opening degree is from 0% ~ 10% and flow percentage is over 60%, sensitivity adjustment is too big, the handwheel moves, steam flow is too large, or too small. While above 10% opening, sensitivity adjustment is too low, at 40% ~ 100% opening scope projects without regulatory function. Therefore difficult to travel in the whole range efficiently regulate steam flow. Meanwhile valve opening is smaller, the fluid reach the critical velocity, consequential vibration and erosion etc, serious problem.
2011-04-08