In 1985, the first mediumradiushorizontalwell 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。
2
Well WP-1 is the first mediumradiushorizontalwell 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。
3
Small size bent housing screw drill with high build rate must be developed to meet the requirements of sidetracking the short to mediumradiushorizontalwell.