Justification of emergency tool design for removal of drill string stuck in intentionally deviated wells

Horizontal directional drilling is often accompanied with accidents, with loss of expensive equipment in wells. A hook emergency tool is proposed for the removal of drill strings from intentionally deviated and horizontal wells. Release of a stuck drill string involves drilling of a parallel close-spaced well down to the places of the drill string sticking with the concurrent relaxation of the compression zone surrounding the stuck drill string. The key mission of the parallel closed-space drilling is dynamic equilibrium of the tool, i.e. prevention of the drill axis departure from the set path. The dynamic analyses and designs show that steady-state drilling in the preset direction requires that the ratio of moments at the drill and annular bit is proportional to the ratio of their drilling areas. Applicability of the tool is proved by the tests of the prototype hook emergency drilling tool.

Simisinov A. D., Volkov E. V., Simisinov D. I. Justification of emergency tool design for removal of drill string stuck in intentionally deviated wells . MIAB. Mining Inf. Anal. Bull. 2021;(11-1):258—264. [In Russ]. DOI: 10.25018/0236_1493_2021_111_0_258.

The study was carried out in accordance with the state assignment of the Ministry of Education and Science of Russia to perform research for the Ural State Mining University on the topic No. 1021060707960-7-2.3.1.

Simisinov A. D.¹, Student;
Volkov E. B.², Cand. Sci. (Eng.), Head of the Engineering Mechanics Department, Associate Professor;
SimisinovD. I.², Head of the Mining Equipment Operation Department, Associate Professor, Cand. Sci. (Eng.), e-mail: 7sinov@mail.ru;
¹ Ural Federal University named after the First President of Russian B. N. Eltsin, Yekaterinburg, Russia;
² Ural State Mining University, Yekaterinburg, Russia.

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