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10.1371/journal.pone.0194582 http://scihub22266oqcxt.onion/10.1371/journal.pone.0194582 C5895008!5895008 !29641615     free     free     free Warning: file_get_contents(https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&id=29641615 &cmd=llinks): Failed to open stream: HTTP request failed! HTTP/1.1 429 Too Many Requests in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 215 Deprecated: Implicit conversion from float 213.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Warning: imagejpeg(C:\Inetpub\vhosts\kidney.de\httpdocs\phplern\29641615 .jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117       PLoS+One 2018 ; 13 (4 ): e0194582 Nephropedia Template TP {{tp|p=29641615 |t=2018. A new drilling method-Earthworm-like vibration drilling |pdf=|usr=}}{{29641615 }} gab.com Text A new drilling method-Earthworm-like vibration drilling JO: PLoS One http://www.kidney.de/pget.php?&tw=1&pmid=29641615 #FOAvip The load transfer difficulty caused by borehole wall friction severely limits the penetration rate and extended-reach limit of complex structural wells. A new friction reduction technology termed "earthworm-like drilling" is proposed in this paper to improve the load transfer of complex structural wells. A mathematical model based on a "soft-string" model is developed and solved. The results show that earthworm-like drilling is more effective than single-point vibration drilling. The amplitude and frequency of the pulse pressure and the installation position of the shakers have a substantial impact on friction reduction and load transfer. An optimization model based on the projection gradient method is developed and used to optimize the position of three shakers in a horizontal well. The results verify the feasibility and advantages of earthworm-like drilling, and establish a solid theoretical foundation for its application in oil field drilling. Twit Text FOAVip A new drilling method-Earthworm-like vibration drilling ????PLoS One http://www.kidney.de/pget.php?&tw=1&pmid=29641615 #FOAvip Twit Text # Free Paper on # # # # # LINK http://www.kidney.de/pget.php?&tw=1&pmid=29641615 #FOAvip English Wikipedia <ref>{{Cite pmid|29641615 }}</ref> A new drilling method-Earthworm-like vibration drilling #MMPMID29641615 Wang P ; Ni H ; Wang R PLoS One 2018[]; 13 (4 ): e0194582 PMID29641615 show ga The load transfer difficulty caused by borehole wall friction severely limits the penetration rate and extended-reach limit of complex structural wells. A new friction reduction technology termed "earthworm-like drilling" is proposed in this paper to improve the load transfer of complex structural wells. A mathematical model based on a "soft-string" model is developed and solved. The results show that earthworm-like drilling is more effective than single-point vibration drilling. The amplitude and frequency of the pulse pressure and the installation position of the shakers have a substantial impact on friction reduction and load transfer. An optimization model based on the projection gradient method is developed and used to optimize the position of three shakers in a horizontal well. The results verify the feasibility and advantages of earthworm-like drilling, and establish a solid theoretical foundation for its application in oil field drilling. äA new drilling method-Earthworm-like vibration drilling (epmc).pdf DeepDyve Pubget Overpricing