Abstract
This paper addresses the effectiveness of impact energy use in pilot bore directional drilling at pipe driving. We establish and develop new design-engineering principles for this method. These principles are based on a drill string construction with a new nipple thread connection and a generator construction of strain waves transferred through the drill string. The experiment was conducted on a test bench. Strain measurement is used to estimate compression, tensile, shear and bending stresses in the drill string during the propagation of elastic waves. Finally, the main directions of pilot bore directional drilling improvement during pipe driving are determinated. The new engineering design, as components of the pilot bore directional drilling technology are presented.
Highlights
Large-scale application of trenchless technology in underground construction has motivated the proposed research
Rotary well drilling rigs are used for these purposes [1,2,3,4,5]. The disadvantages of these drill rigs are as follows: firstly, the inefficiency of drill rigs in medium-hard and harder rocks, and secondly when drilling tools have to deal with similar hard materials, in particular concrete slabs or other construction debris
In response to this problem, powerful percussive mechanisms are added in drill rigs used for pilot bores and for hardpan penetration [6]
Summary
Large-scale application of trenchless technology in underground construction has motivated the proposed research. Rotary well drilling rigs are used for these purposes [1,2,3,4,5] The disadvantages of these drill rigs are as follows: firstly, the inefficiency of drill rigs in medium-hard and harder rocks, and secondly when drilling tools have to deal with similar hard materials, in particular concrete slabs or other construction debris. In response to this problem, powerful percussive mechanisms are added in drill rigs used for pilot bores and for hardpan penetration [6]. The technologies using impact energy are promising They allow influencing objects (rocks) with huge efforts. Their efficiency can be maximised only by understanding the drill string dynamic process and by studying the regularities of strain waves propagating through the drill strings
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