For clays, it is common for the hole to slowly enlarge with the passing of time, especially if water-base muds are being used.
而对于粘土，通常的情况是井眼随时间增加而缓慢增大，尤其当使用水基泥浆时。
But when according to the site conditions determined to crack a drilling section with oblique relations, hole spacing can enlarge exploration.
但当根据现场条件确定的钻探剖面与地裂缝呈斜交关系时，勘探孔间距可以适当放大。
The measures to control the vapor purging time and flow rate of vapour, enlarge the oil-gas space and increase the number of air hole as well as venting area are given, which can effective...
提出采取严格控制扫线作业时间和扫线蒸汽流量，增大油气空间的体积和增加罐顶通气孔数量和面积等措施，可有效地预防该类事故的发生。
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