TECHICAL Series MATHEMATICS  INFORMATICS  PHYSICS Series PHILOLOGY Series ECONOMIC SCIENCES Sereies EDUCATIONAL SCIENCES Series LAW AND SOCIAL SCIENCES Series
Closed System Drilling
(Universitatea Petrol ? Gaze din Ploiesti, bd. Bucureşti, 39, Ploieşti e-mail: ghemih@yahoo.com)
Vol LX • No. 4/2008
Mihai Gheorghitoiu
Universitatea Petrol ? Gaze din Ploiesti, bd. Bucureşti, 39, Ploieşti
e-mail: ghemih@yahoo.com

 Keywords   rotating clos device, parasite casing string,flow choke, dual gradient

 Abstract
In actual conditions,when the hydrocarbons necessary is so big, the drilling industry is put face to face with new and impressive challenges, because it have to realise wells in very difficult environment like depth, water depth, long distance from shore,a.s.o.
Classical way of well control only by mud density is difficult and expansive to apply in these hardwork conditions. A complete control of the well pressures it's necessary, not only to the bottom but also in some parts of the circle space and on the open well. This impose the completion of the circulatory system with working in and out of the well devices for a complet control of the well.

 Rezumat
In conditiile actuale, cand necesarul de hidrocarburi este asa mare, industria de foraj este confruntata cu noi si impresionante provocari, in sensul ca trebuie sa realizeze sondele in conditii foarte dificile, ca adancime, adancime de apa, distanta mare de tarm s.a.
Modul obisnuit de control al sondei numai prin reglarea densitatii fluidului este greoi si scump in aceste conditii grele de lucru. Se impune un control mai complet al presiunilor in sonda, nu numai la talpa, ci si in anumite portiuni ale spatiului inelar si la gura sondei. Acest lucru necesita completarea sistemului de circulatie cu dispozitive care sa lucreze in sonda si la suprafata in vederea exercitarii unui control complet al sondei.



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