技术套管固井后，磨阻流板或钻回压凡尔时有哪些注意事项？
参考答案：
1钻压尽可能控制低些，10～30千牛为好；2每10～15分钟上提活动钻具一次，上提高度不能少于一米；如果遇卡，千万不要硬提，可先放下钻具，转动方向后再提。若反复几次均无效，可轻提、慢转、倒划眼处理；3计算准确深度，在快磨穿或钻穿之前，更要控制钻压，以防压碎形成活动的大块，造成磨进困难，甚至遇卡。
Charles R. Drew was a medical student at Columbia University in New York. Before he graduated, he wrote an article __41___ blood bank, that is, the storing of blood. Up till then, a lot of people had died from loss of blood __42___ there was no blood bank. When the United States entered the Second World War, it became __43___ to set up blood banks. Dr Drew became __44___ of the Red Cross’s first blood bank. When the Red Cross __45___ blood banks to collect and store blood for men __46__ in battle, black American gave blood along with the whites. At ___47__ their blood was not accepted. Later blood from the blacks was ___48___ but was stored in a __49___ place from “white” blood. Although the best doctors __50___ that there was __51___ difference at all between the blood of blacks and whites, the Red Cross, with the support of the government, __52___ to separate black blood from white blood. After the war, Dr Drew was ___53__ from Washington with three other doctors to attend a medical meeting in a southern state. In northern Carolina their car went __54___ a ditch（深沟）and Dr Drew was __55___ hurt. He had lost __56__ blood by the time a passing car took him to the __57___ hospital. But they were stopped at the gate of the hospital. “__58__him to the hospital for blacks.” No matter __59___ they said, they could not get into the hospital. They had to take him to the __60___ hospital, but on the way Dr Drew died because he had lost too much blood.
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