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.

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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.

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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.

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