The result shows that the main reasons are high bottom hole temperature, corrosion of drilling tool during storage and drilling process, high value of formation drillability, and multi-fault.
结果表明，井底温度高、钻具存放及钻井过程中的腐蚀和地层可钻性级值高且断层多，是该地区钻具失效的主要原因。
Cleanout hole series can be set at the cornet from the bottom tank shell course to the bottom of the heavy oil storage tank for cleaning and draining during maintenance.
清扫孔装于重质油罐底部、清扫孔油罐可放出污水扫除内污泥。
A novel grass planting brick mainly comprises an upper brick surface, a bearing surface on the bottom part, an earth storage surface on the waist part, a grass planting hole and drainage holes.
一种新型植草砖，它主要包括上砖面、底部承重面、腰部储土面、植草孔、排水孔。
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