Inner upsetting technology for thin wall drillingpipes was used in Series SQ high strength wire line drillingpipes.
研究开发成功的SQ系列高强度绳索取心钻杆首次采用了薄壁钻杆内镦粗技术。
2
Comparing with steel drillingpipes, the aluminium well drillingpipes are lighter in weight, more durable in use, save cost in operation and better in drilling performance.
同钢钻探管相比，铝钻探管具有质轻、使用寿命长、节约操作费用、钻探性能优良等特点。
3
As the report points out, many of them rely on water freelancers—laying pipes, drilling wells, or trucking water—who sell water to people unserved by public utilities.