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（一）在钻机方面：1．向高速、多速、无级变速发展美国、加拿大、瑞典等国近年来生产的钻机，转速一般由100—1000转/分，某种新型钻机最高者达到3000转/分；瑞典正在研制3000一4000转/分的钻机；日本已制成3300转/分的钻机。这些钻机变速范围较广，瑞典钻机一般有8—10个速度，最高者16个速度；日本钻机最大变速达12速。增加变速过多，必然使钻机结构复杂，增加设备重量，因而有些国家采用无级变速结构。
(A) In the drilling area: 1. To the high-speed, multi-speed, continuously variable speed development The United States, Canada, Sweden and other countries in recent years, the production of rigs, speed generally from 100-1000 rev / min, the highest of a new type of drilling rig to 3000 rev / min; Sweden is developing 3000 4000 rev / min drilling rig; Japan has made a 3300 rev / min drilling rig. These rigs have a wide range of speeds, and Swedish rigs typically have 8-10 speeds, the highest of 16 speeds; the largest for Japanese rigs is 12-speed. To increase the speed change is too large, it is bound to complicate the rig structure and increase the weight of the equipment. Therefore, some countries use a continuously variable transmission structure.