本文介绍的采用套管钻进和潜孔锤钻进相结合的复合性钻进工艺，有效地解决了在卵砾石层中钻进的难题。
Difficulties are encountered in drilling in boulder formation are efficiently eliminated by using of a combined drilling technique which combines casing drilling with DTH drilling method.
主要产品有：各类金刚石钻头、复合片钻头、套管靴子、扩孔器、单双管绳索取芯钻具、绳索取芯钻杆、套管及其它钻探工具。
Thee main products are: all kinds of diamond drill bits, PDC bits, casing boots, reaming, single and double tube wireline coring drilling, coring drill pipe, casing and other drilling tools.
本文通过金属套管和改性聚醚醚酮复合材料棒芯的胶接实验，证明了在缸体的加工中使用胶接工艺是不合适的。
After the experiment of gluing stainless steel and modified PEEK composites, we knew the cylinder couldn't be manufactured by gluing.
在套管、油管和管线长期的储存过程中，它提供优异的复合保护。
It is an excellent running compound and also provides superior protection for long term storage.
在套管、油管和管线长期的储存过程中，它提供优异的复合保护。
It is an excellent running compound and also provides superior protection for long term storage.
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