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The perfect hammer head can be obtained by designing technological equipment, using vertical pouring and string casting process in CO2-sodium silicate sand.

采用CO2硬化水玻璃砂无箱立浇串铸工艺，设计工装，可以获得优质健全的锤头产品。

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When fishing the string fish in sand producer, string milling length should be optimized and a downhole string dynamic analysis model is established to calculate the length.

出砂井落鱼管柱打捞需要对管柱的套铣长度进行选择，针对这一问题建立了井下管柱受力分析计算模型。

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Byron Bay is one of a great string of headlands with white-sand bays stretching up the New South Wales coast into Queensland.

BBC: The perfect trip: New South Wales

As the drill progresses through the rock and sand below the seabed, the pressure of the mud in the drill string must be kept within a limited range.

ECONOMIST: Inside story