Wiertnictwo, Nafta, Gaz
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ISSN 1997-2011
e-ISSN: 2300-7044
Issue Date
2007
Volume
T. 24
Number
Nr 1
Description
Journal Volume
Wiertnictwo, Nafta, Gaz
T. 24 (2007)
Projects
Pages
Articles
Development and implementation of drill rig hydraulic drives
(2007) Artymiuk, Jan; Bednarz, Stanisław; Falbo, Giuseppe; Małozięć, Tomasz
Rotary and translatory motions are a basic form of transforming other type of energy on mechanical energy in the driving systems. The proper use of fundamentals of hydromechanics decides about the design and build of the driving systems, hydraulic systems with hydraulic control. Technical feasibility, especially tightness of hydraulic systems, is of big importance. This factor has been a drawback in the power hydraulics applications for years. A higher reliability of sealings caused a fast development of hydraulic drives. Hydraulic drives as the advantages have wide possibilities of control and transmission of drive to long distances, high efficiency, relatively simple design of control elements, possibility of making still and flexible drives as well as direct connection of the motor with the working machine or its sub-assembly. These drives require qualified attendance and strict following instructions and technical procedures. The dynamic torque of hydraulic drives is considerably higher than in other types of drive, resulting in short time constants of the system. Hydraulic Drillmec rigs have been supplied for different applications (oil, gas, geothermal and water researches) and tested in many field conditions - besides workover operations yet - confirming the flexibility, reliability and good performance of this idea. They are operating all around the world having a number of technical advantages.
Koncepcja odmetanowania pokładów węgla otworami wiertniczymi w KWK Szczygłowice
(2007) Artymiuk, Jan; Kiełbik, Wiesław
During coal production in the Polish mines about milliard m3 of methane are generated each year. Only the fourth part of coal-bed gas is directed to the methane-removal system. Most part of it is used, whereas the remaining one goes to the atmosphere, having an disadvantageous impact on the climate. Recently a technology of methane removal through surface drilling wells has been successfully worked out. By using drilling wells and specialist technologies, methane is recuperated from the coal beds, which is treated as recuperation of gas from unconventional sources.
Wpływ wewnętrznego rąbka zwornika przewodu na przepływ płynów wiertniczych
(2007) Bednarz, Stanisław; Knez, Dariusz
Drill pipes called drill rods as an essential part of the drill string are used in horizontal directional drilling. The application of frictional welding is the most common method in plain pipes and tool joints connection. The outside and inside surfaces flash at the ends of parts joined arises after this operation as a result of high contact force, simultaneous rotation of tool joint and high temperature in accordance with the materials melting. The outside surface flash is removed by cutting method, however big problems are encountered during removal of the flash inside of the pipe. The paper concerns the influence of the internal flash on the drilling fluid flow during making the hole. The ununiform flash shape creates difficulties in the analytical description of this phenomenon. According to this, computer simulation appears to be a very effective tool for solving this problem. Friction losses and velocity vectors field in the flash zone are evaluated on numerical calculations basis.
Czynniki bezpieczeństwa przeciwerupcyjnego podczas rekonstrukcji odwiertów naftowych
(2007) Bednarz, Stanisław; Kopej, Bogdan Volodimirovič; Urba, Roman
Many years production of oil and natural gas requires well service and at times internal intervention or workover operations. Considerable technical risk is involved in these operations. This is a result of the well equipment technical condition after a lot of years' exploitation, severity of environment affecting on downhole equipment as surface wellhead facilities. The operation program shall account for many factors, types and wellhead design, Christmas trees, tubing, packers, circulation valves, subsurface safety valves, wireline tools and pressures, production rate and well fluid features. Well killing at many factors affected is focused on replacing of formation fluid with operation fluid non-contaminating the well and reservoir. At the end of this operation reducing of surface wellhead pressure to atmospheric pressure level is requested. Technical and environmental conditions affecting on some well killing procedures are presented in the paper.
Demulgatory i ich wpływ na procesy eksploatacji ropy naftowej
(2007) Bęben, Dariusz; Jewulski, Jan; Janocha, Andrzej
A considerable part of exploited oil is emulsion, which according to the World's statistics constitutes 25-35% of extracted oil. The presence of emulsion decreases oil production from wells, resulting in the increase of cost of its separation and acceleration of corrosion of production utilities. A number of methods of oil emulsion separation exist; however majority of them are based on the surfactants (demulsifiers). A specific surfactant may be efficient only for a given emulsion. It cannot be used for other emulsion without prior studies and analyses as may result in stabilization or formation of hardly separable multiple emulsions. The demulsifier should be so selected as not to cause corrosion of utilities. It should also be non-toxic and easily removable from sewage water. These issues are discussed in the paper.