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- petroleum drilling techniques5
- drilling fluid & completion fluid4
- journal of the china coal society / mei tan xue bao4
- research & exploration in laboratory4
- coal science & technology (0253-2336)3
- journal of building structures / jianzhu jiegou xuebao3
- lubrication engineering (0254-0150)3
- natural gas industry3
- oil drilling & production technology / shiyou zuancai gongyi3