INVESTIGATION OF ROTATIONAL AND LONGITUDINAL MOTIONS OF A SUPER LONG ROD IN INCLINED BORE-HOLES


ABSTRACT

Gorbunovich I.V., Levkivska L.V. Investigation of rotational and longitudinal motions of a super long string in inclined bore-holes. Visnyk National Transport University. Series «Technical sciences». Scientific and Technical Collection. - Kyiv: National Transport University, 2020. - Issue 1 (46).

The article deals with a super long elastic tubular rod with an internal fluid flow. The rotational and longitudinal motions of straight and curved rods in inclined bore-holes are studied. The bifurcation states of the rod at these motions are investigated.

The purpose of the study is to detect at the beginning of bifurcation states of straight and curved rods taking into account their friction interaction with the inner surface of a bore-holes.

The reasons of appearance of bifurcation protrusion of the rod are stated. Among these reasons, an internal longitudinal force and torque are identified and described as main ones.

Research methods are based on the construction of boundary-value problems determining the stress­strain state and stability of super long straight and curved rods in an inclined bore-hole. Solving the problems allows detecting the beginning of bifurcation states of rods.

KEY WORDS: SUPER LONG ROD, STRIGHT AND INCLINED BORE-HOLE, ROTATIONAL AND LONGITUDINAL MOTIONS, BIFURCATION STATES, LONGITUDINAL FORCE, TORQUE.

REFERENCES

  • Gulyayev V.I., Gorbunovich I.V. (2008). Ustoychivost burilnyih kolonn v naklonno napravlennyih skvazhinah [Drill string stability in inclined bore-holes]. Problemy prochnosti - Strength of Materials, 6, 71­81 [in Russian].
  • Gulyayev V.I., Gaidaichuk V.V., Solovjov I.L., Gorbunovich I.V. (2009). The buckling of elongated rotating drill strings. J. Petr. Sci. Eng. No - P. 140 - 148.
  • Gorbunovich I.V., Mezheinikova L.S. [2007]. Stiikist burylnykh kolon v pokhylo-skerovanykh naftovykh ta hazovykh sverdlovynakh [Drill columns stability in inclined oil and gas bore-holes]. Visnyk Natsionalnoho Transportnoho Universytetu - Visnyk of National Transport University, 15, 380-383 [in Ukrainian].
  • Gorbunovich I.V., Levkovskaia L.V. [2018]. Izuchenie problemyi vyiyavleniya kriticheskih rezhimov funktsionirovaniya burilnyih kolonn v vertikalnyih i krivolineynyih skvazhinah [Investigation of the problem of detection of critical drill string operating modes in vertical and curved bore-holes]. Visnyk Natsionalnoho Transportnoho Universytetu. Seriia «Tekhnichni nauky». Naukovo-tekhnichnyi zbirnyk - Visnyk of National Transport University. «Technical sciences» series. Scientific and Technical collection, 1(40), 90-97 [in Russian].
  • Gulyayev V.I., Andrusenko O.M., Levkivska L.V. (2015). Minimizatsia syl oporu pry osovomu rusi burylnoi kolony u kryvoliniinii sverdlovyni [Minimization of resistance forces in axial motion of a drill string in a curve bore-hole]. Visnyk Natsionalnoho Transportnoho Universytetu. Seria «Tehnichni nauky». Naukovo - tekhnichnyi zbirnyk - Visnyk of National Transport University. Series «Technical sciences». Scientific and Technical Collection. Issue 1 (31), 145 - 152 [in Ukrainian].
  • Gaidaichuk V.V., Levkivska L.V., Kovalchyk Y. I. (2016). Matematychne modeliuvannia pruzhnoho zghynannia burylnoi kolony u kanali kryvoliniinoi nafto-hazovoi sverdlovyny [Mathematical modeling of the drill string elastic bending in channel curvilinear oil and gas bore-holes] Opir materialiv i teoria sporud - Strength of Materials and Theory of Structures. Issue 97, 43-58 [in Ukrainian].
  • Gorbunovich I.V. (2010). Bifurkatsiini vypynannia obertovykh hiperdovhykh stryzhniv z vnutrishnim potokom ridyny [Bifurcation protrusion of rotating super long strings with internal fluid flow]. Visnyk Natsionalnoho transportnoho universytetu - Visnyk of National Transport University, 21, 310 - 314 [in Ukrainian].
  • Gorbunovich I.V. (2018).Vynyknennia bifurkatsiinykh staniv obertovykh hiperdovhykh stryzhniv [Appearance of bifurcation states of rotating super long strings]. Mizhnarodna naukova konferentsiia

«Suchasni problemy mekhaniky ta matematyky - 2018». Instytut prykladnykh problem mekhaniky i matematyky NAN Ukrainy, Lvivskyi natsionalnyi universytet. Materialy konferentsii - International scientific conference «Modern Problems of Mechanics and Mathematics». Institute of Applied Problems of Mechanics and Mathematics of NAS of Ukraine. Lviv National University. Conference theses. (pp.86-88). Lviv. [in Ukrainian].

AUTHOR

Gorbunovich Iryna Valentynivna, Ph.D., National Transport University, associate professor department of high mathematics, e-mail: irina.gorbunovich@gmail.com, tel. +380676001177, Ukraine, 01103, Kyiv, Boychuka str.,42, of. 514, orcid.org/0000-0002-6859-0663.

Levkivska Liydmyla Volodymyrivna, Ph.D., National Transport University, associate professor department of high mathematics, e-mail: l_v_g@ukr.net, тел. +380975475724, Ukraine, 01103, Kyiv, Boychuka str.,42, of. 514, orcid.org/0000-0002-5589-5257.

REVIEWER

Meish V.F., Physics and Mathematics (Dr.), Professor, S.P. Timoshenko Institute of Mechanics of the National Academy of Sciences of Ukraine, Kyiv, Ukraine.

Mozgovyy V.V., Engineering (Dr.), Professor, National Transport University, Head of Department of road construction materials and chemistry, Kyiv, Ukraine.

Article language: Ukrainian

Open Access: http://publications.ntu.edu.ua/visnyk/46/092.pdf

Print date: 15.04.2020

Online publication date: 27.10.2020


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