The behavior of enclosed-type connection of drill pipes during percussive drilling

A. Shadrina, L. Saruev

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

Abstract

Percussion drilling is the efficient method to drill small holes (≥ 70 mm) in medium- hard and harder rocks. The existing types of drill strings for geological explorations are not intended for strain wave energy transfer. The description of the improved design of the drill string having enclosed-type nipple connections is given in this paper presents. This nipple connection is designed to be used in drilling small exploration wells with formation sampling. Experimental findings prove the effectiveness of the enclosed nipple connection in relation to the load distribution in operation. The paper presents research results of the connection behavior under quasistatic loading (compression-tension). Loop diagrams are constructed and analyzed in force-displacement coordinates. Research results are obtained for shear stresses occurred in the nipple connection. A mechanism of shear stress distribution is described for the wave strain propagation over the connecting element. It is shown that in the course of operation the drill pipe tightening reduces the shear stress three times.

Original languageEnglish
Title of host publicationIOP Conference Series: Earth and Environmental Science
PublisherInstitute of Physics Publishing
Volume27
Edition1
DOIs
Publication statusPublished - 10 Nov 2015
Event19th International Scientific Symposium on Problems of Geology and Subsurface Development, PGON 2014 - Tomsk, Russian Federation
Duration: 6 Apr 201510 Apr 2015

Other

Other19th International Scientific Symposium on Problems of Geology and Subsurface Development, PGON 2014
CountryRussian Federation
CityTomsk
Period6.4.1510.4.15

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)
  • Environmental Science(all)

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    Shadrina, A., & Saruev, L. (2015). The behavior of enclosed-type connection of drill pipes during percussive drilling. In IOP Conference Series: Earth and Environmental Science (1 ed., Vol. 27). [012057] Institute of Physics Publishing. https://doi.org/10.1088/1755-1315/27/1/012057