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2022
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Invention
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An impact transmission mechanism for a rotary percussion drilling tool.
A tubular apparatus incl... |
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Invention
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An impact transmission mechanism for a rotary percussion drilling tool. A tubular apparatus (200)... |
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2021
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Invention
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Downhole blowout preventer and blowout prevention operation method. A downhole blowout preventer ... |
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Invention
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Polymer having dispersing function, polycarboxylic acid cement dispersant, preparation method the... |
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Invention
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Polymer having dispersing function, oil well cement dispersant, and preparation method therefor a... |
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Invention
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Staged cementing device and staged cementing method. Disclosed is a staged cementing device (10),... |
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2020
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Invention
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Well drilling tool and method for determining parameter thereof. A well drilling tool and a metho... |
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Invention
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Drilling tool. A drilling tool, comprising an outer cylinder (1); a power rotary shaft (13), prov... |
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Invention
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Drilling speed increasing device. A drilling speed increasing device (100), comprising: an outer ... |
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Invention
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Well drilling acceleration tool. Disclosed is a well drilling acceleration tool (1), comprising: ... |
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Invention
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Downhole multidimensional imaging feature extraction method and imaging apparatus. An apparatus f... |
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Invention
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Imaging feature extraction method and imaging apparatus for use in multidimensional borehole. An ... |
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Invention
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Reactive torque automatic balancing device for screw drilling tool, drilling string, and method. ... |
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Invention
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Reaction torque automatic balancing device for screw drilling tool, and drilling pipe string and ... |
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2019
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Invention
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Downhole auxiliary drilling apparatus. The present invention provides a downhole auxiliary drilli... |
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Invention
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Downhole auxiliary drilling apparatus. The present invention provides a downhole auxiliary ... |
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2018
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Invention
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Maleamic acid monomer and preparation method and use thereof. A maleamic acid monomer, and a prep... |
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Invention
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Random copolymer and preparation method thereof, and drilling fluid. A random copolymer, a prepar... |
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Invention
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Maleamic acid monomer and preparation method thereof, random copolymer, preparation method and us... |
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2017
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Invention
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Resistivity measurement while drilling device and method. A resistivity measurement while drillin... |
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2014
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Invention
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Data transmission system and method for transmission of downhole measurement-while-drilling data ... |
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Invention
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Data transmission system and method for transmitting downhole measurement-while-drilling data to ... |
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2013
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Invention
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Modified starch, preparation method and use of the same, and drilling fluid.
The present inventi... |
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2012
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Invention
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Filtration control agent and a drilling fluid containing the same. The present invention provides... |
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Invention
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Dispersant and a drilling fluid containing the same.
The present invention provides a dispersant... |
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2011
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Invention
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Copolymer and preparation method and application thereof. A copolymer and preparation method and ... |
