Scipediacontent: Scipediacontent moved page Draft Content 474050584 to 238,295pg

2021-03-23T03:11:39Z

Scipediacontent moved page Draft Content 474050584 to 238,295pg

Scipediacontent: Created page with " == Abstract == In the past decades, horizontal directional drilling (HDD) has been successfully used to install various pipelines in different strata. However, construction..."

2021-03-23T03:09:48Z

Created page with " == Abstract == In the past decades, horizontal directional drilling (HDD) has been successfully used to install various pipelines in different strata. However, construction..."

New page

== Abstract ==

In the past decades, horizontal directional drilling (HDD) has been successfully used to install various pipelines in different strata. However, construction accidents such as drill-burying and drill-sticking occur occasionally when pipelines installed by HDD method in an unstable stratum such as sand cobble stratum. Recently, HDD with dual drill pipes was used to install pipelines in unstable stratum, and the effect is significant. The law of cuttings migration for HDD with dual drill pipes is still unclear. Therefore, it is necessary to study the law of cuttings migration in reverse circulation with dual drill pipes. This study performs numerical simulations and experimental research on the cuttings-carrying process in reverse circulation directional drilling with dual drill pipes. Based on the assumption of dual concentric pipes, simulations of fluid-solid two-phase flows are conducted in different flow channels between the inner and outer drill pipes. An experimental cuttings-carrying model is then established. By combining the results of the numerical simulations and experimental investigation, the hydraulic parameters of the dual drill pipe system are optimized, and the rationalities of the drill tool design and the grading selection are validated. The results of this study provide a reference cuttings-carrying model during reverse circulation HDD with dual drill pipes.

Document type: Article

== Full document ==
<pdf>Media:Draft_Content_474050584-beopen1423-8413-document.pdf</pdf>

== Original document ==

The different versions of the original document can be found in:

* [http://dx.doi.org/10.1155/2019/6262308 http://dx.doi.org/10.1155/2019/6262308] under the license http://creativecommons.org/licenses/by/4.0/

* [https://doi.org/10.1155/2019/6262308 https://doi.org/10.1155/2019/6262308] under the license http://creativecommons.org/licenses/by/4.0

* [http://downloads.hindawi.com/journals/ace/2019/6262308.pdf http://downloads.hindawi.com/journals/ace/2019/6262308.pdf],
: [http://downloads.hindawi.com/journals/ace/2019/6262308.xml http://downloads.hindawi.com/journals/ace/2019/6262308.xml],
: [http://dx.doi.org/10.1155/2019/6262308 http://dx.doi.org/10.1155/2019/6262308] under the license cc-by

* [http://dx.doi.org/10.1155/2019/6262308 http://dx.doi.org/10.1155/2019/6262308],
: [https://doaj.org/toc/1687-8086 https://doaj.org/toc/1687-8086],
: [https://doaj.org/toc/1687-8094 https://doaj.org/toc/1687-8094] under the license http://creativecommons.org/licenses/by/4.0/

* [https://www.hindawi.com/journals/ace/2019/6262308 https://www.hindawi.com/journals/ace/2019/6262308],
: [http://downloads.hindawi.com/journals/ace/2019/6262308.pdf http://downloads.hindawi.com/journals/ace/2019/6262308.pdf],
: [https://academic.microsoft.com/#/detail/2980819374 https://academic.microsoft.com/#/detail/2980819374]

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Scipediacontent: Scipediacontent moved page Draft Content 474050584 to 238,295pg

Scipediacontent: Created page with " == Abstract == In the past decades, horizontal directional drilling (HDD) has been successfully used to install various pipelines in different strata. However, construction..."