Along with the oil prospecting and production, the existent drilling bit (steel and tungsten carbide tooth bit) was not effective in some complicated stratum.
随着油气勘探开发的不断深入，现有牙轮(钢齿、镶齿)钻头已难以对一些复杂地层进行有效的钻进。
Along with the oil prospecting and production, the existent drilling bit (steel and tungsten carbide tooth bit) was not effective in some complicated stratum.
随着油气勘探开发的不断深入，现有牙轮(钢齿、镶齿)钻头已难以对一些复杂地层进行有效的钻进。
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