Results 11 to 20 of about 4,640 (79)

Cutting of Siliceous Dolomite by Special-Shaped PDC Cutter under Confining Pressure

Shiyou jixie
The dolomite formation is an important field for oil and gas exploration in the future. However， due to the high confining pressure environment in wellbore and the hard-to-drill characteristics of dolomite， traditional planar cutter PDC bit is prone to ...
Tian Wanqing, Liu Weiji, Qin Dehong, Liu Chenglong, Wang Haitao, Hu Hai   +5 more
doaj   +1 more source

Numerical Simulation on Cutting and Breaking of Heterogeneous Conglomerate by Special-Shaped PDC Cutter

Shiyou jixie
When the PDC bit is used to drill conglomerate formations， the frequent impact loads reduce the expected life of PDC cutter， leading to frequent bit changes and ultimately affecting drilling efficiency.
Shi Jiangang, Li Gensheng, Liu Weiji, Wu Desheng, Zhang Nan, Deng Kaichuang   +5 more
doaj   +1 more source

Mechanical properties and rock-breaking effects of ridge-shaped PDC teeth

Jin'gangshi yu moliao moju gongcheng
Objectives: With the depletion of easily recoverable oil reservoirs, the focus of oil and gas exploration and development in China has shifted to "two deeps and non-conventional" oil and gas fields.
Zhitao XIE, Yuxuan ZHAO, Yong GUO, Desheng WU, Yadong LI   +4 more
doaj   +1 more source

Numerical Simulation Study on the Rock Breaking Effect of Multiple Axe-Shaped Cutters in Rotary Percussion Drilling

Shiyou jixie
The compatibility of percussion tools， PDC cutter types and hard rock formations is a key factor in extending the service life of percussion tools and drill bits and achieve the best rock breaking effect， but it has been rarely studied.
Leng Youheng, Wang Lixin, Chen Pengyu, Liu Ronghe, Xi Yan   +4 more
doaj   +1 more source

Curtis\u27s botanical magazine. [PDF]

v.93=ser.3:v.23 (1867) [no.5618 ...
Bentham-Moxon Trust., Bentham-Moxon Trust., Curtis, William, 1746-1799, Hooker, Joseph Dalton, 1817-1911, Hooker, William Jackson, Sir, 1785-1865, Prain, D. 1857-, Royal Botanic Gardens, Kew., Royal Horticultural Society (Great Britain), Stanley Smith Horticultural Trust, Stanley Smith Horticultural Trust., Stapf, O. (Otto) 1857-1933   +10 more
core   +4 more sources

Bulletin of the Center for Children's Books 56 (09) 2003 [PDF]

, 2003
published or submitted for ...

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Experimental study on shale-breaking of special-shaped cutter PDC bit

Geomechanics and Geophysics for Geo-Energy and Geo-Resources
To enhance the drilling efficiency and extend the service life of PDC (Polycrystalline Diamond Composite) bits in shale formations, this study delves into the rock-breaking mechanisms of special-shaped cutters through a comprehensive experimental ...
Chunliang Zhang, Xin Yang, Zhaoliang Zhu, Xiaohua Ke, Zhaofeng Zhang, Hua Luo, Yong Ma, Dongdong Song   +7 more
doaj   +1 more source

Helicopter landing procedures and landing manual in M/V Island Intervention [PDF]

, 2014
Summary This bachelor thesis defines the helicopter operations onboard the ship Island Intervention. All existing manuals are very hard to read, due to the amount of theoretical information concerning helicopter operations.
Nurminen, Jussi
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Treasures of Sumatra [PDF]

, 2009
Tahun 2003 Museum Nasional Indonesia (MNI) dan Rijksmuseum voor Volkenkunde, Leiden (RMV) mengawali suatu kesepakatan kerjasama. Salah satu bentuk kerjasama tersebut adalah penyelenggaraan pameran "Warisan Budaya Bersama atau Shared Cultural Haritage ...
Brinkgreve, Francine, Budiarti, Hari, Dewi, N.L.P. Chandra, Ernawati, Wahyu, Haryanti, Haryanti, Ismail, Junaidi, Karim, Mulyawan, Krishna, H. Maya, Lisabilla. E, Nusi, Moerdianti, Retno, Mutia, Riza, Retno, Desrika Retno, Rini, Rini, Rodina, Rodina, Sundari, Ekowati, Utomo, Bambang Budi, Wardhani, Fifia, Zulkarnain, Irwan   +17 more
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Control and Management of Mesquite on Rangeland. [PDF]

, 1981
16 ...
Hoffman, Garlyn O.
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