"Bulletin of the Association of Drilling Contractors" №2, 2020

INFLUENCE OF THE DRILL STRING SPATIAL FORM ON TRANSPORT OF CUTTINGS IN DIRECTIONAL WELLS

Kadochnikov V.G. – postgraduate student of the St. Petersburg Mining University,
kadochnikov93@gmail.com
Dvoynikov M.V. – Doctor of Technical Sciences, Professor, Head of the Department of Well Drilling, St. Petersburg Mining University, dvoinik72@gmail.com
Blinov P.A. – Candidate of Technical Sciences, Associate Professor, St. Petersburg Mining University,
blinovpavel@mail.ru



Key words: drilling parameters; transport of cuttings; loss of stability; buckling; directional well; well cleaning.

The paper argues in favor of studying controlling influence of sinusoidal buckling in a drill string on cuttings and sludge removal from a directional well. It introduces an experimental test facility developed in the laboratory of Well Drilling Department, St. Petersburg Mining University, and presents a detailed procedure of the experimental study. The paper also gives results of a full-scale multi-factorial experiment that showed how intensity and quality of cleaning a well from cuttings and sludge depends on the value of several parameters, such as: flow rate and rheological properties of a cleaning agent, rotation rate and number of half waves occurring due to longitudinal bending of the drill string.

INFLUENCE OF THE DRILL STRING SPATIAL FORM ON TRANSPORT OF CUTTINGS IN DIRECTIONAL WELLS

Kadochnikov V.G. – postgraduate student of the St. Petersburg Mining University, kadochnikov93@gmail.com
Dvoynikov M.V.  – Doctor of Technical Sciences, Professor, Head of the Department of Well Drilling, St. Petersburg Mining University, dvoinik72@gmail.com
Blinov P.A. – Candidate of Technical Sciences, Associate Professor, St. Petersburg Mining University, blinovpavel@mail.ru

Key words: drilling parameters; transport of cuttings; loss of stability; buckling; directional well; well cleaning.

The paper argues in favor of studying controlling influence of sinusoidal buckling in a drill string on cuttings and sludge removal from a directional well. It introduces an experimental test facility developed in the laboratory of Well Drilling Department, St. Petersburg Mining University, and presents a detailed procedure of the experimental study. The paper also gives results of a full-scale multi-factorial experiment that showed how intensity and quality of cleaning a well from cuttings and sludge depends on the value of several parameters, such as: flow rate and rheological properties of a cleaning agent, rotation rate and number of half waves occurring due to longitudinal bending of the drill string.

The year 2021 number 1nd issue of the quarterly journal, "Bulletin of the Association of Drilling Contractors", is now available "Bulletin of the Association of Drilling Contractors"

ISSN 2073-9877

The scientific and technical journal, “Bulletin of the Association of Drilling Contractors”, is listed by the Higher Attestation Commission of the RF Ministry of Education and Science as one of the leading refereed journals and publications that feature main scientific results of doctoral and candidate’s dissertations.

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