TECHICAL Series MATHEMATICS  INFORMATICS  PHYSICS Series PHILOLOGY Series ECONOMIC SCIENCES Sereies EDUCATIONAL SCIENCES Series LAW AND SOCIAL SCIENCES Series
How do Oil Country Tubular Goods Lubricants work? ? An Autopsy of Thread Compounds
(Texas A&M University, 3116 TAMU, College Station, TX, USA e-mail:catalin.teodoriu@pe.tamu.edu)
Vol LX • No. 4/2008
Cătălin Teodoriu
Texas A&M University, 3116 TAMU, College Station, TX, USA
e-mail:catalin.teodoriu@pe.tamu.edu

 Keywords   OCTG, Thread, Compound

 Abstract
Thread compounds are commonly used in the oil industry in order to facilitate the makeup process of a wide variety of Oil Country Tubular Goods (OCTG). Whether tubing, casing or Rotary Shouldered Connection the compound must offer consistent frictional properties, adequate lubrication and sealing properties, physical and chemical stability both in service and in storage conditions, as well as properties that allow the efficient application of the compound on the connection surfaces. This paper presents experimental results that show some inconsistencies with the API assumptions regarding the thread compound behaviour at high contact pressures (as for RSC applications). The performance of the thread compound during the makeup process will be also explained.

 Rezumat
Unsorile pentru filete sunt folosite in industria petroliera in scopul imbunatatirii si optimizarii procesului de insurubare a materialului tubular petrolier, cunoscut sub numele de OCTG. Indiferent de tipul filetului, pentru burlane, tevi de extractie sau racorduri speciale, unsorile trebuie sa aiba proprietati tribologice reproductibile si constante, proprietati de ungere adecvate scopului lor, proprietati care sa asigure o etansare optima a filetului, proprietati fizice si chimice compatibile cu aplicatia si, nu in ultimul rind, proprietati care sa permita o aplicare uniforma a unsorii pe filet. Aceasta lucrare prezinta rezultate experimentale care sa sustina faptul ca unsorile pentru filetele racordurilor speciale au o comportare diferita de definitia data de API, conform careia coeficientul de frecare are o valoare fixa de 0.08. De asemenea, se va incerca explicarea proceselor care au loc in interiorul unsorii in timpul procesului de insurubare, fapt care poate ajuta constructorii de unsori la dezvoltarea unor unsori cu proprietati imbunatatite.



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