Diagnosing of a Freeze-In of Metal Drill Pipes by Their Stressedly-Deformed State in the Controlled Directional Bore Hole
K. G. Levchuk$^{1,2}$
$^{1}$G. V. Kurdyumov Institute for Metal Physics, NAS of Ukraine, 36 Academician Vernadsky Blvd., UA-03142 Kyiv, Ukraine
$^{2}$Ivano-Frankivsk National Technical University of Oil and Gas, 15 Karpatska Str., 76019 Ivano-Frankivsk, Ukraine
Received: 21.02.2018. Download: PDF
The article considers the problem of a mathematical modelling of the dynamics for the release of discrete-continuous system of metal drill pipes frozen in a directional well. A computer program is created for the numerical calculation of the characteristics of stressedly deformed stuck metal drill string, which arise during the elimination of an accident. A technique for diagnosing the state of metal pipes is developed and makes it possible to justify the choice of a method for eliminating the stuck drilling tool. By the example of a stuck metal drill pipe in a deep controlled directional well, taking into account the agents of its heterogeneous load by external concentrated forces as well as the distributed gravity forces, contact and frictional interactions with walls of the well, a numerical calculation is performed, and the strength dependences on the technical and technological factors of its unfreezing are obtained.
Key words: directional well, metal drill string, stuck, diagnosis, strength.
URL: http://mfint.imp.kiev.ua/en/abstract/v40/i05/0701.html
DOI: https://doi.org/10.15407/mfint.40.05.0701
PACS: 02.60.Cb, 45.20.-d, 46.70.-p, 62.20.Qp, 62.25.-g, 81.40.Pq, 81.70.Bt
Citation: K. G. Levchuk, Diagnosing of a Freeze-In of Metal Drill Pipes by Their Stressedly-Deformed State in the Controlled Directional Bore Hole, Metallofiz. Noveishie Tekhnol., 40, No. 5: 701—712 (2018) (in Ukrainian)