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[单选题]
Q/SY02552-2018《钻井井控技术规范》中规定:进行工程设计时,水泥应返至技术套管内或油、气、水层以上()m
A.100
B.300
C.500
D.200
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B、300
![](https://static.youtibao.com/asksite/comm/h5/images/solist_ts.png)
A.100
B.300
C.500
D.200
B、300
A.30mg/m3(20ppm)
B.45mg/m3(30ppm)
C.75mg/m3(50ppm)
D.150mg/m3(100ppm)
A.地层孔隙压力梯度
B.地层破裂压力梯度
C.地层坍塌压力梯度
D.地层漏失压力梯度
A.阈限值
B.安全临界浓度
C.危险临界浓度
D.4.3ppm以下
A.硫化氢
B.二氧化碳
C.二氧化硫
D.甲烷
A.开排;闭排
B.闭排;开排
C.占有;闭排
D.开排;占有