Investigations on API Modified Thread Compound Properties with Respect to Sealing Capacity of Open Type Threads
(Studiul experimental al unsorii "API Modified" cu privire la capaciatea de etansare a imbinarilor filetate)
Vol LXII • No. 3A/2010
Catalin Teodoriu*, Diana Cursaru**, Dwayne Bourne***
* Institute of Petroleum Engineering, Clausthal University of Technology, Clausthal-Zelerfeld, Germany
** Universitatea Petrol-Gaze Ploiesti, Ploiesti, Romania
*** Texas A&M University, 3116 TAMU, College Station, TX, USA

 Keywords   OCTG, Thread, Compound.

The sealing mechanism of API round thread includes the use of thread compound which is used to seal leak passages. These leak passages are helical capillaries found at the roots and crests of the thread tooth and vary in area according to the size of the thread tooth as well as thread tolerances. The thread compound viscosity is a critical parameter to achieve maximum sealability. This study measured the viscosity of thread compound under various temperatures. It was found that viscosity of thread compound falls in the range of 285,667 cP and 47,758 cP when measured between 32.9 0F and 121.5 0F. This information is very important because thread compound is essential to the function of open thread connections. The investigations were focused on API Modified Compound since it is widely used in the industry. Additionally the compound was analyzed chemically and physically to find a way to correlate the viscosity with compound composition.

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. Mecanismul de etansare al filetelor se bazeaza pe introducerea unei substante viscose in spatial elicoidal genrat de geometria imperfect a filetului.Viscositatea unsorii este foarte importanta atunci cind se analizeaza capacitatea de etansare a unei imbinari filetate. Lucrarea de fata prezinta investigatiile experimentale asupra unsorii API Modified. A fost masurata viscositatea unsorii la temperature intre 32.90F si 121.50F obtinindu-se valori intre 285667 cP and 47758 cP.

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