【单选题】
地层所能承受的关井压力，取决于地层破裂压力梯度、井深以及___。
A. 井眼尺寸
B. 井内液柱压力
C. 地层渗透率
D. 地层流体种类
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答案
B
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某修井队用密度1.20g/cm3的泥浆加深修井到井深2000m处发生溢流，关井套压3MPa，关井油压2MPa，压井液附加压力4MPa，计算压井泥浆密度___g/cm3。
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某井用密度1.50g/cm3的泥浆钻到井深5000m处发生溢流，关井立、套压分别为2MPa和3.7MPa，溢流量1.8m3，环空平均单位容积12L/m，判断溢流种类是___。
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【单选题】
循环法是将密度___的压井液用泵泵入井内并进行循环，密度较小的原压井液（或油、气及水）被压井用的压井液替出井筒达到压井目的的方法。
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