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"REPORTER of the Association of Drilling Contractors" №3, 2016

CALCULATION OF THE OPENING OF A RECTANGULAR SHALLOW CRACK AND PRESSURE DROP IN LAMINAR FLOW OF VISCOUS-PLASTIC FLUID

Leonov, Eugene G. – Dr.Tech.Sci., professor, chair of drilling of the Gubkin Russian State University of Oil and Gas, bur220@gubkin.ru bur220@gubkin.ru

УДК 622.245

Key words: mobile electrical installation, portable earthing sflow, viscous-plastic fluid, slot, crack, lost circulation, hydrocrack, Volarovich – Gutkin.

The paper analyzes stationary laminar flow of viscous-plastic fluid in a rectangular shallow slot (crack), which is described by the Volarovich-Gutkin cubic equation. Conversion of the equation to a non-dimensional form has allowed to develop a simple semigraphical method for the calculation of pressure drops. New approximate formulas are presented for explicit calculation of pressure drop and crack opening in the range of Sent Venant numbers from 10-2 to 103. Numerical illustrations were used to compare results of calculations based on the proposed formulas and the generally accepted Volarovich-Gutkin equation.

CALCULATION OF THE OPENING OF A RECTANGULAR SHALLOW CRACK AND PRESSURE DROP IN LAMINAR FLOW OF VISCOUS-PLASTIC FLUID

Leonov, Eugene G. – Dr.Tech.Sci., professor, chair of drilling of the Gubkin Russian State University of Oil and Gas, bur220@gubkin.ru

Key words: mobile electrical installation, portable earthing sflow, viscous-plastic fluid, slot, crack, lost circulation, hydrocrack, Volarovich – Gutkin.

The paper analyzes stationary laminar flow of viscous-plastic fluid in a rectangular shallow slot (crack), which is described by the Volarovich-Gutkin cubic equation. Conversion of the equation to a non-dimensional form has allowed to develop a simple semigraphical method for the calculation of pressure drops. New approximate formulas are presented for explicit calculation of pressure drop and crack opening in the range of Sent Venant numbers from 10-2 to 103. Numerical illustrations were used to compare results of calculations based on the proposed formulas and the generally accepted Volarovich-Gutkin equation.

 

Издан 3 номер за 2024 год ежеквартального научно — технического и производственного журнала "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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