Browsing by Subject "drill string"

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Access status: Restricted ,
Analysis of chosen wellbore stability elements
(Data obrony: 2013-06-26) Yurych, Lidiia
Wydział Wiertnictwa, Nafty i Gazu
Access status: Open Access ,
Drilling works for degasation purposes in the conditions of Green Gas DPB, a.s.
(2008) Mazáč, Josef; Janků, Miroslav
„Odgazowanie” jest częścią nazwy specjalistycznej firmy powołanej do życia w 1960 r. w Okręgu Górnicznym Ostrava-Karvina w celu zapewnienia bezpieczeństwa realizacji prac górniczych w czeskiej części Górnośląskiego Zagłębia Węglowego. W Zakładzie Odgazowania i Drenażu (pierwotna nazwa obecnego Green Gas DPB, a.s.) od 48 lat prowadzi się odgazowanie otworów wiertniczych.
Access status: Open Access ,
Porównanie aluminiowych rur płuczkowych ze stalowymi
(2007) Artymiuk, Jan
Drill string is a long cylinder with a longitudinal opening inside, consisting of sections (drilling pipes and collars) from 8.5 m to 9.5 m long and from 3 1/2'' to 6 5/8'' in diameter, fastened by threaded connections. The most frequently applied material is steel of various strength parameters, of considerable weight as compared to the strength parameters. Analyses were made to find components which could substitute the traditional steel material with another one, equally strong but lighter. Every kilogram on hook means bigger energy consumption of the rig and bigger (and so heavier) elements in the drawing system. Attempts were made to compare mud pipes made of steel and aluminum alloys. It was indicated that further research and construction works on aluminum drilling pipes should be continued.
Access status: Open Access ,
The problem of liquidation of the open eruption by drilling tools
(2014) Fibingr, Jaroslav; Bujok, Petr; Klempa, Martin; Porzer, Michał; Kalus, Dalibor; Rado, Robert
Drilling process of deep borehole consists of different drilling operations. Each of them can cause numerous different drilling problems especially when a borehole is performed. While drilling the most dangerous problems can occur once the drilling fluids (oil, gas or water) spontaneously flow out from the drilled formations into the borehole and then to the surface. It can also happen that the pressures in the borehole are not balanced and an influx of fluid into the borehole (a kick) will occur. If no action is taken to stop a kick once it begins, then the fluids will be pushed out of the borehole and will be flowing uncontrollably to surface (blow-out). Blow-out is prevented by closing off the well at the surface with special kind of valves (Blow-out Preventers - BOPs). When pressure control over the well is lost, swift action must be taken to avert the severe consequences. These consequences may include: — endangering of human life, — loss of rig and equipment, — negative influence on the environment, — additional costs of bringing the well under control again, — loss of reservoir production. In the case of kick or blow-out will occur in the practical use are different procedures and methods to control a borehole. These procedures and methods depend on the actual drilling operation scenario. One of them can be a tripping operation when the drill string is pulled out or run back again. In this case the drill string is open either after a break-out or before making up the drill pipes and drill collars. There is a variety of tools that can be used to prevent the formation of fluids rising up inside the drill pipes. One of this tool is a safety valve (rod preventers - BOP) to prevent the blow-out of the drill string. This manuał safety valve should be kept on the rig floor at all times. It needs to be a fuli opening ball-type valve so there is no restriction to flow. This valve is installed onto the top of the drill string if a kick occurs during a trip. However, this solution is quite inconvenient and difficult because involves special heavy tools, e.g. a crane. Drilling process of deep borehole consists of different drilling operations. Each of them can cause numerous different drilling problems especially when a borehole is performed. While drilling the most dangerous problems can occur once the drilling fluids (oil, gas or water) spontaneously flow out from the drilled formations into the borehole and then to the surface. It can also happen that the pressures in the borehole are not balanced and an influx of fluid into the borehole (a kick) will occur. If no action is taken to stop a kick once it begins, then the fluids will be pushed out of the borehole and will be flowing uncontrollably to surface (blow-out). Blow-out is prevented by closing off the well at the surface with special kind of valves (Blow-out Preventers - BOPs). When pressure control over the well is lost, swift action must be taken to avert the severe consequences. These consequences may include: — endangering of human life, — loss of rig and equipment, — negative influence on the environment, — additional costs of bringing the well under control again, — loss of reservoir production. In the case of kick or blow-out will occur in the practical use are different procedures and methods to control a borehole. These procedures and methods depend on the actual drilling operation scenario. One of them can be a tripping operation when the drill string is pulled out or run back again. In this case the drill string is open either after a break-out or before making up the drill pipes and drill collars. There is a variety of tools that can be used to prevent the formation of fluids rising up inside the drill pipes. One of this tool is a safety valve (rod preventers - BOP) to prevent the blow-out of the drill string. This manuał safety valve should be kept on the rig floor at all times. It needs to be a fuli opening ball-type valve so there is no restriction to flow. This valve is installed onto the top of the drill string if a kick occurs during a trip. However, this solution is quite inconvenient and difficult because involves special heavy tools, e.g. a crane. This paper presents a new solution making use of special control equipment for the blowing open drill string. This equipment is based on a hydraulic press (named »Drill Pipe Rescue Press I«) which has been developed by HBZS, MND S.A. Hodonin and VSB-Technical University of Ostrava, supported by Faculty of Drilling, Oil and Gas AGH-UST Kraków.