In 1985, the first medium radius horizontal well was drilled using a down-hole mud motor.
在1985年，第一口的中半径水平井采用井下泥浆马达技术钻成。
Well WP-1 is the first medium radius horizontal well drilled in Jianghan oilfield, and its horizontal interval is drilled using under-balanced technology.
王平1井是江汉油田的第一口中曲率水平井，储层岩性为盐间非砂岩层，水平井段采用欠平衡钻井技术。
Small size bent housing screw drill with high build rate must be developed to meet the requirements of sidetracking the short to medium radius horizontal well.
螺杆钻具是其中的一项关键技术，其主要目的是研制满足侧钻中短半径水平井需要的小尺寸高造斜率的弯外壳螺杆钻具。
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