CN204225773U - 一种煤层大孔径成孔钻头 - Google Patents
一种煤层大孔径成孔钻头 Download PDFInfo
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- CN204225773U CN204225773U CN201420709436.3U CN201420709436U CN204225773U CN 204225773 U CN204225773 U CN 204225773U CN 201420709436 U CN201420709436 U CN 201420709436U CN 204225773 U CN204225773 U CN 204225773U
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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CN110678622A (zh) * | 2017-05-05 | 2020-01-10 | 史密斯国际有限公司 | 阶梯式井下工具和使用方法 |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110678622A (zh) * | 2017-05-05 | 2020-01-10 | 史密斯国际有限公司 | 阶梯式井下工具和使用方法 |
CN110678622B (zh) * | 2017-05-05 | 2021-12-21 | 史密斯国际有限公司 | 阶梯式井下工具和使用方法 |
US11208847B2 (en) | 2017-05-05 | 2021-12-28 | Schlumberger Technology Corporation | Stepped downhole tools and methods of use |
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C14 | Grant of patent or utility model | ||
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CP01 | Change in the name or title of a patent holder |
Address after: 467000 Henan province Pingdingshan City Beihuan South (Xinhua District Industrial Park Road West) Patentee after: HENAN TIEFULAI EQUIPMENT MANUFACTURING CO., LTD. Address before: 467000 Henan province Pingdingshan City Beihuan South (Xinhua District Industrial Park Road West) Patentee before: Pingdingshan Tiefulai Electronic and Mechanical Equipment Co., Ltd. |
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CP01 | Change in the name or title of a patent holder |
Address after: 467000 South North Ring Road, Pingdingshan City, Henan Province (West of Xinhua Industrial Park) Patentee after: Tiefulai Equipment Manufacturing Group Co.,Ltd. Address before: 467000 South North Ring Road, Pingdingshan City, Henan Province (West of Xinhua Industrial Park) Patentee before: HENAN TIEFULAI EQUIPMENT MANUFACTURING Co.,Ltd. |
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CP01 | Change in the name or title of a patent holder |