Especially it is the same with borehole operation which is limited in radial dimension.
尤其适用于对径向尺寸有限制要求的油田井下作业。
Very severe problems during drilling were circulation loss and borehole collapse because of formation fracture growing, and drilling operation was very difficult.
该气田地层裂缝发育，钻井过程中井漏和井塌问题非常严重，钻井作业十分困难。
As a result, both blocks can be regarded as candidate sites for high-level radioactive waste repository; and next research stage, e. g. borehole survey, is under operation.
研究结果表明，新场和芨芨槽岩块均比较完整，可作为处置库的候选岩块进入钻孔研究阶段。
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