«Onshore and offshore oil and gas well construction»

Use of a diagnostic criterion to determine the performance of a milling tool

UDC: 622.23.05
DOI: -

Authors:

¹ Ufa State Petroleum Technological University, Ufa, Russia
² Perfobur, Moscow, Russia

Keywords: secondary formation opening, small-diameter channel drilling, production casing string, equipment state assessment, time series, parameters control, technical diagnostics, random fluctuations, Hoover criterion

Annotation:

The authors of the article present information on secondary methods of a productive formation opening using the "Perfobur" technical system. Its assembly part for perforating small-diameter channels is described. The general information on the use of the technological parameters fluctuations of the axial load on the milling tool and the pressure of the drilling fluid during milling, presented as a random process, is considered. Diagnostic criteria for assessing the technical state of downhole equipment are given. It has been determined that these criteria application does not provide universal recommendations on the rational operating time of downhole equipment. A new criterion for determining the operability of a milling tool – the Hoover criterion – is proposed. Based on the calculations carried out to test a 82 mm diameter cutter for a column with a diameter of 178 mm of strength group E, the values of the criteria for diagnosing operability according to Hoover and the main types of equipment failures corresponding to them were determined.

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