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目前很多队的生产实践证明，在中硬地层钻进，简化井身结构，采用小口径钻进，以及强化钻进措施，可以提高钻进速度，加快勘探进程，节约大量钢材。但因小径岩心管（Ф89、Ф73）的供应缺乏，影响了这一成熟经验的广泛推行。其次，目前供应的小径管材的管壁太薄（t=3.75—4毫米），在快速钻进过程中，尚存在一些较严重的缺点：1．丝扣强度小，经常发生滑扣、掉钻头等事故。2．岩心管容易弯曲。
At present, the production practice of many teams has proved that drilling in medium-hard formations, simplifying the structure of wellbore, adopting small-diameter drilling and strengthening drilling measures can increase the drilling speed, speed up the exploration process and save a large amount of steel. However, the lack of supply of small-diameter core pipes (Ф89, Ф73) has affected the widespread implementation of this mature experience. Secondly, the pipe wall of the small diameter pipe currently supplied is too thin (t = 3.75-4 mm), and some serious shortcomings still exist in the rapid drilling process: 1. Threaded strength is small, often occur skid, off bit accidents. 2. Core tube is easy to bend.